THE INFLUENCE OF ACCOUNTING SYSTEM ON PUBLIC EXPENDITURE CONTROL IN NIGERIA

CHAPTER ONE: INTRODUCTION

1.1 Background of the Study

An accounting system is a structured set of processes, procedures, controls, and records designed to identify, measure, record, classify, summarize, and communicate financial information about an entity to users for decision-making purposes. In the public sector, an accounting system encompasses the entire financial management infrastructure, including budgeting, expenditure authorization, commitment accounting, payment processing, recording of transactions, financial reporting, and internal controls. The public sector accounting system serves as the financial nervous system of government, providing the information needed to ensure that public funds are collected, managed, and disbursed in accordance with legal requirements, budgetary authorizations, and principles of sound financial management (Premchand, 2017). (Premchand, 2017)

Public expenditure refers to the spending of government funds on goods, services, transfers, and capital projects to achieve public policy objectives. Public expenditure in Nigeria includes recurrent expenditure (salaries, allowances, overheads, debt servicing) and capital expenditure (infrastructure development, education, health, defense). The Federal Government of Nigeria budget has grown significantly over the years, from approximately ₦4.9 trillion in 2016 to over ₦20 trillion in 2023. Total public expenditure (federal, state, and local government) accounts for a significant proportion of GDP (approximately 15-20%). With such large sums involved, effective control of public expenditure is essential to prevent waste, fraud, inefficiency, and misallocation of resources (BudgIT, 2023). (BudgIT, 2023)

Public expenditure control refers to the mechanisms, processes, and systems used to ensure that public funds are spent in accordance with legal requirements, budgetary authorizations, and principles of economy, efficiency, and effectiveness. Effective expenditure control encompasses ex-ante controls (preventing unauthorized or inappropriate spending before it occurs) and ex-post controls (detecting and correcting unauthorized or inappropriate spending after it has occurred). Key elements of expenditure control include: budget preparation and approval, allotment of funds, commitment control (ensuring that obligations do not exceed available appropriations), payment authorization, recording and accounting, internal audit, external audit, and legislative oversight (Schick, 2018). (Schick, 2018)

The accounting system is central to public expenditure control for several reasons. First, the accounting system provides the budgetary control framework: it tracks actual expenditures against budgeted appropriations, generating alerts when expenditures approach or exceed limits. Second, the accounting system provides commitment control: it records commitments (purchase orders, contracts) before payments are made, ensuring that the government does not commit to spend more than is available. Third, the accounting system provides payment control: it ensures that payments are made only for valid obligations, to authorized payees, and in accordance with approval limits. Fourth, the accounting system provides recording and reporting: it produces financial reports that enable managers and oversight bodies to monitor expenditure performance. Fifth, the accounting system provides an audit trail: it documents every transaction from initiation to completion, enabling internal and external auditors to verify compliance (Khan and Hildreth, 2019). (Khan and Hildreth, 2019)

In Nigeria, the public sector accounting system has undergone significant reforms over the past two decades. Prior to 2005, Nigeria operated a cash basis of accounting, where transactions were recorded only when cash was received or paid. The cash basis was simple but provided incomplete information about assets, liabilities, and commitments. In 2005, the Federal Government adopted the accrual basis of accounting (modified accrual) for key ministries, departments, and agencies (MDAs), and later committed to full accrual IPSAS (International Public Sector Accounting Standards). The adoption of the Government Integrated Financial Management Information System (GIFMIS) in 2012 was a major milestone. GIFMIS is an integrated computerized financial management system that automates budgeting, commitment control, procurement, payment processing, accounting, and reporting. GIFMIS was intended to strengthen expenditure control by preventing unauthorized spending, enforcing budget limits, and providing real-time expenditure information (Okoye, Okafor, and Nnamdi, 2020). (Okoye et al., 2020)

The International Public Sector Accounting Standards (IPSAS) provide a framework for public sector accounting. IPSAS are based on IFRS but adapted for the public sector context. Key IPSAS standards relevant to expenditure control include: IPSAS 1 (Presentation of Financial Statements), IPSAS 2 (Cash Flow Statements), IPSAS 12 (Inventories), IPSAS 17 (Property, Plant and Equipment), and IPSAS 23 (Revenue from Non-Exchange Transactions). Nigeria has committed to adopting IPSAS accrual basis, but implementation has been incomplete. Some MDAs still use cash-based accounting, and the quality of financial reporting varies widely (IPSAS Board, 2022). (IPSAS Board, 2022)

Despite these reforms, Nigeria faces significant challenges in public expenditure control. The Office of the Auditor-General of the Federation (OAuGF) has consistently reported substantial financial irregularities in its annual audit reports. The 2019 Auditor-General’s report documented: unauthorised expenditures (₦50 billion), payments without supporting documents (₦45 billion), contract awards without due process (₦30 billion), and non-retirement of advances (₦20 billion). Similar findings appear year after year, suggesting that the accounting system is not effectively controlling expenditure. The Auditor-General has repeatedly recommended strengthening the accounting system, but recommendations have not been implemented (Auditor-General of the Federation, 2020). (Auditor-General of the Federation, 2020)

The Government Integrated Financial Management Information System (GIFMIS) was expected to revolutionize expenditure control. GIFMIS integrates budgeting (budget preparation and approval), procurement (contract awards), commitment control (ensuring commitments do not exceed budgets), payment processing (vendor payments, employee salaries), accounting (recording transactions), and reporting (financial statements). In theory, GIFMIS should prevent unauthorized expenditures because the system will reject any transaction that exceeds budget limits or lacks proper approval. In practice, however, GIFMIS has been plagued by implementation challenges: system downtime, lack of trained personnel, data entry errors, and overrides (where authorized officials bypass controls). The effectiveness of GIFMIS in controlling expenditure has not been rigorously evaluated (Okoye et al., 2020). (Okoye et al., 2020)

Several specific weaknesses in the Nigerian public sector accounting system undermine expenditure control. Weak commitment control: many MDAs do not record commitments (purchase orders, contracts) before payments, leading to expenditure exceeding available appropriations. Manual override of controls: GIFMIS has override features that allow authorized officials to bypass system controls; these overrides are not always justified or documented. Lack of integration: some MDAs use separate payroll systems, procurement systems, or asset registers that are not integrated with GIFMIS, creating opportunities for error and fraud. Inadequate internal controls: many MDAs lack effective internal controls (segregation of duties, authorizations, reconciliations), enabling unauthorized expenditures to occur without detection. Poor record keeping: some MDAs do not maintain complete or accurate accounting records, making it impossible to track expenditure or detect irregularities (Adeyemi and Ogundipe, 2020). (Adeyemi and Ogundipe, 2020)

The consequences of poor expenditure control in Nigeria are severe. Waste: funds are spent on unnecessary or overpriced goods and services. Fraud: public funds are stolen through inflated contracts, ghost workers, fake suppliers, and embezzlement. Inefficiency: funds are not allocated to their highest-value uses, reducing the impact of public spending on development outcomes. Reduced public trust: citizens lose confidence in government when they perceive that public funds are mismanaged. Poor service delivery: when funds are diverted, essential services (education, health, infrastructure) suffer. Strengthening the accounting system to improve expenditure control is therefore a policy priority (BudgIT, 2023). (BudgIT, 2023)

Several theories explain the relationship between accounting systems and public expenditure control. Agency theory (Jensen and Meckling, 1976) suggests that government officials (agents) may not act in the best interests of citizens (principals). The accounting system reduces information asymmetry by providing citizens and oversight bodies with information about agent actions, enabling monitoring. Stewardship theory (Donaldson and Davis, 1991) suggests that government officials are motivated to act responsibly if they are trusted and empowered; the accounting system supports stewardship by providing information that officials need to manage effectively. Institutional theory (DiMaggio and Powell, 1983) suggests that accounting systems are adopted not only for their technical benefits but also for legitimacy: governments adopt modern accounting systems (IPSAS, GIFMIS) to signal that they are modern, transparent, and accountable. (DiMaggio and Powell, 1983; Donaldson and Davis, 1991; Jensen and Meckling, 1976)

Public financial management (PFM) theory (Schick, 2018) provides a framework for understanding expenditure control. Schick (2018) argues that effective PFM requires: (1) aggregate fiscal discipline (total expenditure does not exceed total revenue plus sustainable borrowing); (2) allocative efficiency (resources are allocated to strategic priorities); and (3) operational efficiency (resources are used to achieve outputs at minimum cost). The accounting system contributes to all three objectives. (Schick, 2018)

The COVID-19 pandemic has created new challenges for public expenditure control and highlighted the importance of accounting systems. The government released substantial funds for pandemic response (health equipment, social protection, economic stimulus). However, there were widespread reports of fraud, waste, and mismanagement of COVID-19 funds. The Auditor-General reported that billions of Naira in COVID-19 funds could not be accounted for due to poor record keeping. The pandemic exposed weaknesses in the accounting system and underscored the need for strengthening (Ogunyemi and Adewale, 2021). (Ogunyemi and Adewale, 2021)

The Open Government Partnership (OGP) and other transparency initiatives have increased demand for public expenditure information. Citizens, civil society organizations, and international development partners are calling for greater transparency and accountability in public spending. The accounting system is the source of this information. If the accounting system does not produce accurate, timely, and accessible expenditure information, transparency initiatives cannot succeed. Therefore, strengthening the accounting system is a prerequisite for achieving transparency and accountability goals (BudgIT, 2023). (BudgIT, 2023)

International development partners (World Bank, IMF, DFID, EU) have provided financial and technical support for public financial management reforms in Nigeria, including GIFMIS implementation and IPSAS adoption. These partners require evidence on whether their investments have been effective. This study provides such evidence, enabling development partners to assess the return on their investments and to design future support programs (World Bank, 2020). (World Bank, 2020)

The relationship between accounting systems and public expenditure control is not automatic. An accounting system that is poorly designed, inadequately implemented, or circumvented by officials will not control expenditure. The effectiveness of the accounting system depends on: (1) system design (does the system have commitment control, budget control, audit trail?); (2) implementation quality (are staff trained? is the system functioning?); (3) compliance (do officials follow the system or override it?); (4) oversight (are internal and external auditors checking compliance?); and (5) enforcement (are irregularities investigated and punished?). This study examines these factors (Khan and Hildreth, 2019). (Khan and Hildreth, 2019)

Finally, the influence of the accounting system on public expenditure control must be understood in the context of Nigeria’s governance environment. Nigeria faces challenges of corruption, political interference, weak rule of law, and limited technical capacity. These challenges may limit the effectiveness of even the best-designed accounting system. Reforming the accounting system alone is not sufficient; broader governance reforms (anti-corruption, civil service reform, judicial reform) are also needed. This study examines the interaction between the accounting system and the governance environment (Adeyemi and Ogundipe, 2020). (Adeyemi and Ogundipe, 2020)

1.2 Statement of the Problem

Despite significant investments in public sector accounting reforms in Nigeria—including the adoption of IPSAS, the implementation of GIFMIS, and the introduction of integrated payroll systems—public expenditure control remains weak. This problem manifests in persistent financial irregularities, budget overruns, waste, fraud, and poor service delivery. The statement of this problem is supported by the following specific issues.

First, persistent financial irregularities documented by the Auditor-General of the Federation. Year after year, the Auditor-General reports substantial unauthorized expenditures, payments without supporting documents, contract awards without due process, and non-retirement of advances. The 2019 report documented over ₦50 billion in unauthorized expenditures, ₦45 billion in payments without supporting documents, and ₦30 billion in contract awards without due process (Auditor-General of the Federation, 2020). These findings suggest that the accounting system is not effectively controlling expenditure.

Second, budget implementation gaps. Nigeria’s budget implementation rates are consistently low, not because of lack of funds but because of poor planning and expenditure control. The Budget Office of the Federation reports that capital budget implementation averages 60-70% annually, while recurrent budget implementation exceeds 90%. The gap between appropriated and actual expenditure reflects weaknesses in expenditure control (lack of commitment control, poor cash management) (BudgIT, 2023). (BudgIT, 2023)

Third, GIFMIS implementation challenges. GIFMIS was intended to strengthen expenditure control, but implementation has been problematic. Studies have documented: system downtime (GIFMIS is unavailable for days or weeks, forcing MDAs to use manual processes), lack of trained personnel (many MDAs lack staff who can operate GIFMIS effectively), data entry errors (incorrect coding of transactions), and override abuse (officials bypass system controls without justification). These challenges limit the effectiveness of GIFMIS in controlling expenditure (Okoye et al., 2020). (Okoye et al., 2020)

Fourth, weak internal controls. Many MDAs lack effective internal controls: segregation of duties is absent (same person authorizes, records, and pays), approvals are not documented, reconciliations are not performed, and assets are not safeguarded. The absence of internal controls creates opportunities for unauthorized expenditures to occur without detection. The Auditor-General has repeatedly recommended strengthening internal controls, but recommendations have not been implemented (Adeyemi and Ogundipe, 2020). (Adeyemi and Ogundipe, 2020)

Fifth, lack of integration between financial systems. Some MDAs use separate payroll systems, procurement systems, asset registers, and GIFMIS that are not integrated. This lack of integration creates opportunities for error and fraud: ghost workers can exist on the payroll system without being detected, procurement contracts can be awarded without budget checks, and assets can be purchased without being recorded. Integration is essential for effective expenditure control (Khan and Hildreth, 2019). (Khan and Hildreth, 2019)

Sixth, poor record keeping. Many MDAs do not maintain complete or accurate accounting records. Some MDAs do not record commitments (purchase orders, contracts) before payments, making it impossible to know whether expenditures will exceed appropriations. Some MDAs do not reconcile bank accounts, leaving unreconciled differences undetected. Some MDAs do not retain source documents (invoices, receipts, contracts), making it impossible to verify transactions. Poor record keeping undermines all other expenditure control mechanisms (Premchand, 2017). (Premchand, 2017)

Seventh, lack of enforcement of audit recommendations. The Auditor-General issues audit reports with recommendations for corrective action. However, these recommendations are rarely implemented. The Public Accounts Committee (PAC) of the National Assembly is responsible for reviewing audit reports and holding MDAs accountable, but the PAC is understaffed, underfunded, and lacks technical capacity. Without enforcement, MDAs have no incentive to strengthen expenditure control (Auditor-General of the Federation, 2020). (Auditor-General of the Federation, 2020)

Eighth, COVID-19 expenditure irregularities. During the pandemic, the government released substantial funds for pandemic response. However, the Auditor-General reported that billions of Naira in COVID-19 funds could not be accounted for due to poor record keeping. Some MDAs made payments without supporting documents; others failed to retire advances. The pandemic exposed the fragility of Nigeria’s expenditure control system (Ogunyemi and Adewale, 2021). (Ogunyemi and Adewale, 2021)

Ninth, limited empirical research on the influence of accounting systems on public expenditure control in Nigeria. While many studies have described the accounting system (GIFMIS, IPSAS) and many studies have documented expenditure irregularities, few studies have systematically analyzed the causal relationship between accounting system characteristics and expenditure control outcomes. Which specific accounting system features (commitment control, budget control, audit trail, integration) have the strongest influence on expenditure control? How does implementation quality (staff training, system functionality) affect outcomes? What are the barriers to effective accounting system implementation? This study addresses these questions (Okoye et al., 2020). (Okoye et al., 2020)

Tenth, a significant gap in the literature on public financial management in Nigeria. Most existing studies focus on federal government MDAs, ignoring state and local government accounting systems. However, state and local governments account for a significant proportion of public expenditure (approximately 50% of total public expenditure). State and local governments also have weaker accounting systems than the federal government, and expenditure control problems are more severe at these levels. This study includes state and local governments to provide a comprehensive picture (BudgIT, 2023). (BudgIT, 2023)

Therefore, the central problem this study seeks to address can be stated as: Despite significant investments in public sector accounting reforms in Nigeria—including IPSAS adoption, GIFMIS implementation, and integrated payroll systems—public expenditure control remains weak. Persistent financial irregularities, budget overruns, waste, fraud, and poor service delivery indicate that the accounting system is not effectively controlling expenditure. The specific weaknesses in the accounting system (commitment control, internal controls, integration, record keeping, enforcement) and their influence on expenditure control have not been systematically documented. This study addresses this gap by empirically examining the influence of the accounting system on public expenditure control in Nigeria, covering federal, state, and local government levels.

1.3 Aim of the Study

The aim of this study is to critically examine the influence of the accounting system on public expenditure control in Nigeria, with a view to identifying the specific accounting system features (commitment control, budget control, internal controls, integration, record keeping) that affect expenditure control outcomes, assessing the effectiveness of GIFMIS and other reforms, and proposing evidence-based recommendations for strengthening the accounting system to improve public expenditure control at federal, state, and local government levels.

1.4 Objectives of the Study

The specific objectives of this study are to:

1. Assess the current state of the accounting system in Nigerian public sector entities (federal MDAs, state governments, local governments), including the adoption and implementation of IPSAS and GIFMIS.
2. Evaluate the effectiveness of the accounting system in controlling public expenditure, as measured by financial irregularities (unauthorized expenditures, unsupported payments), budget implementation rates, and audit opinions.
3. Identify the specific weaknesses in the accounting system that undermine expenditure control: weak commitment control, lack of integration, poor internal controls, inadequate record keeping, and enforcement gaps.
4. Examine the relationship between GIFMIS implementation (coverage, functionality, staff training, system downtime) and expenditure control outcomes.
5. Compare expenditure control effectiveness across levels of government (federal, state, local) and across sectors (education, health, infrastructure, administration).
6. Assess the role of internal and external audit in enforcing compliance with the accounting system and identifying irregularities.
7. Examine the influence of governance factors (political interference, corruption, capacity) on the effectiveness of the accounting system.
8. Propose practical, evidence-based recommendations for strengthening the accounting system to improve public expenditure control in Nigeria.

1.5 Research Questions

The following research questions guide this study:

1. What is the current state of the accounting system in Nigerian public sector entities (IPSAS adoption, GIFMIS implementation, internal controls, record keeping)?
2. How effective is the accounting system in controlling public expenditure, as measured by financial irregularities, budget implementation rates, and audit opinions?
3. What are the specific weaknesses in the accounting system that undermine expenditure control?
4. What is the relationship between GIFMIS implementation and expenditure control outcomes?
5. How does expenditure control effectiveness vary across levels of government (federal, state, local) and sectors?
6. How effective are internal and external audit in enforcing compliance with the accounting system?
7. How do governance factors (political interference, corruption, capacity) influence the effectiveness of the accounting system?
8. What recommendations can be proposed for strengthening the accounting system to improve public expenditure control?

1.6 Research Hypotheses

Based on the research objectives and questions, the following hypotheses are formulated. Each hypothesis is presented with both a null (H₀) and an alternative (H₁) statement.

Hypothesis One

• H₀₁: There is no significant relationship between the adoption of GIFMIS and the level of financial irregularities (unauthorized expenditures, unsupported payments) in Nigerian public sector entities.
• H₁₁: There is a significant negative relationship between the adoption of GIFMIS and the level of financial irregularities in Nigerian public sector entities.

Hypothesis Two

• H₀₂: The quality of commitment control (recording of purchase orders and contracts before payment) does not significantly affect budget implementation rates.
• H₁₂: The quality of commitment control significantly affects budget implementation rates, with stronger commitment control associated with higher implementation rates.

Hypothesis Three

• H₀₃: There is no significant relationship between staff training on GIFMIS and the accuracy of financial records.
• H₁₃: There is a significant positive relationship between staff training on GIFMIS and the accuracy of financial records.

Hypothesis Four

• H₀₄: The integration of financial systems (payroll, procurement, GIFMIS) does not significantly affect the incidence of payroll fraud (ghost workers) and procurement fraud.
• H₁₄: The integration of financial systems significantly reduces the incidence of payroll fraud and procurement fraud.

Hypothesis Five

• H₀₅: There is no significant relationship between the frequency of internal audit reviews and the compliance rate with GIFMIS controls.
• H₁₅: There is a significant positive relationship between the frequency of internal audit reviews and the compliance rate with GIFMIS controls.

Hypothesis Six

• H₀₆: The level of public expenditure control (as measured by audit irregularities) does not differ significantly between federal MDAs and state government ministries.
• H₁₆: The level of public expenditure control differs significantly between federal MDAs and state government ministries, with federal MDAs having better control.

Hypothesis Seven

• H₀₇: The quality of record keeping (completeness, timeliness, accuracy) does not significantly affect the time taken to prepare financial statements.
• H₁₇: The quality of record keeping significantly affects the time taken to prepare financial statements, with better record keeping associated with faster preparation.

Hypothesis Eight

• H₀₈: Political interference does not significantly affect the override of GIFMIS controls (e.g., making payments without proper approval).
• H₁₈: Political interference significantly increases the override of GIFMIS controls.

1.7 Significance of the Study

This study holds significance for multiple stakeholders as follows:

For the Office of the Accountant-General of the Federation (OAGF):
The OAGF is responsible for the design and operation of the federal accounting system, including GIFMIS. The study provides evidence on the strengths and weaknesses of the current accounting system, enabling the OAGF to prioritize improvements. If GIFMIS is found to reduce irregularities, the OAGF can expand coverage. If staff training is found to improve outcomes, the OAGF can invest in training. The study also provides evidence for reporting to the Presidency and the National Assembly.

For the Auditor-General of the Federation and State Auditors-General:
Auditors rely on the accounting system to detect irregularities. The study provides evidence on which accounting system weaknesses are most associated with irregularities (e.g., weak commitment control, lack of integration). Auditors can use this evidence to target their audits, focusing on entities with weak accounting systems. The study also provides evidence for audit recommendations (e.g., strengthen commitment control, integrate systems).

For the National Assembly Public Accounts Committee (PAC) and State Legislatures:
The PAC is responsible for reviewing audit reports and holding MDAs accountable. The study provides evidence on systemic accounting weaknesses that require legislative action. For example, if the study finds that lack of integration between payroll and GIFMIS enables ghost workers, the PAC can recommend legislative mandating of integration. The study also provides evidence to assess the effectiveness of past legislative interventions.

For the Ministry of Finance, Budget and National Planning:
The Ministry is responsible for budget preparation, budget execution, and fiscal policy. The study provides evidence on expenditure control challenges that limit budget implementation. If the accounting system is found to be weak, the Ministry can advocate for reforms and resources. The study also provides evidence for reporting to the President and the Federal Executive Council.

For State Governments and Local Governments:
State and local governments face severe expenditure control challenges. The study provides evidence on which accounting system reforms (GIFMIS adoption, IPSAS adoption, internal control strengthening) are most effective. State governments can use this evidence to design reform programs and to request technical assistance from the federal government or development partners.

For Civil Society Organizations (BudgIT, Enough is Enough, TI-Nigeria):
CSOs advocate for transparency and accountability in public expenditure. The study provides evidence on systemic weaknesses that CSOs can use in advocacy campaigns (e.g., “the accounting system is failing to control expenditure”). The study also provides evidence to assess the effectiveness of past advocacy efforts.

For International Development Partners (World Bank, IMF, DFID, EU):
Development partners have invested millions of dollars in public financial management reforms in Nigeria (GIFMIS, IPSAS, public expenditure tracking). The study provides evidence on whether these investments have been effective. If positive effects are found, development partners can continue similar support. If no effects are found, development partners can redesign their programs (e.g., focus more on enforcement, less on system design). The study also provides evidence for program evaluation.

For Academics and Researchers:
This study contributes to the literature on public financial management in developing economies. Most PFM research focuses on developed economies; this study provides evidence from Nigeria, a large, complex developing country. The study uses multiple methods (surveys, document analysis, case studies) and multiple levels (federal, state, local). The study tests theoretical frameworks (agency theory, institutional theory, stewardship theory) in a new context. The study provides a foundation for future research on accounting systems and expenditure control in other African countries.

For the Nigerian Citizen and Taxpayer:
Citizens pay taxes and deserve to know that their money is being spent wisely. The study provides evidence on whether the accounting system is effectively controlling expenditure. If weaknesses are identified, citizens can demand reform. If the system is found to be effective, citizens can have greater confidence. The study also provides evidence for citizen-led monitoring initiatives (e.g., tracking expenditures at local government level).

For the Nigerian Economy:
Public expenditure accounts for 15-20% of GDP. Effective expenditure control ensures that public funds are used to provide essential services (education, health, infrastructure), which supports economic growth and poverty reduction. Wasteful or fraudulent expenditure diverts resources from productive uses. By identifying how to strengthen the accounting system, this study contributes to improving public expenditure outcomes and, ultimately, economic development.

1.8 Scope of the Study

The scope of this study is defined by the following parameters:

Content Scope: The study focuses on the influence of the accounting system on public expenditure control in Nigeria. Specifically, it examines: (1) accounting system features (commitment control, budget control, internal controls, integration, record keeping, audit trail); (2) expenditure control outcomes (financial irregularities, budget implementation rates, audit opinions, timeliness of reporting); (3) the role of GIFMIS and other IT systems; (4) internal and external audit; and (5) governance factors (political interference, corruption, capacity). The study does not examine revenue collection (taxes, non-tax revenue) except as it relates to expenditure control (e.g., cash management). The study does not examine public procurement processes in depth except as they relate to GIFMIS.

Organizational Scope: The study covers three levels of government in Nigeria: federal (selected Ministries, Departments, and Agencies), state (selected state governments and their ministries), and local (selected local government areas). The study includes entities that have implemented GIFMIS (federal and some states) and those that have not (most local governments, some states). The study includes entities that have adopted IPSAS (federal, some states) and those that have not (most local governments, some states). The study excludes government-owned enterprises (e.g., NITDA, NIMC) that operate under private sector accounting standards.

Geographic Scope: The study covers Nigeria. For federal MDAs, the study includes those headquartered in Abuja (Federal Capital Territory). For state governments, the study includes four states: Lagos (South-West), Kano (North-West), Rivers (South-South), and Enugu (South-East), representing Nigeria’s geopolitical diversity. For local governments, the study includes selected LGAs within these states. Findings may be generalizable to other states not included, but caution is warranted.

Time Scope: The study covers the period 2015-2024, a ten-year period encompassing: (1) full GIFMIS implementation at federal level (from 2015); (2) the adoption of the 2016 National Policy on Public Financial Management; (3) the COVID-19 pandemic period (2020-2021); and (4) the post-pandemic recovery period (2022-2024). This time period enables analysis of trends in expenditure control over time.

Theoretical Scope: The study is grounded in agency theory, stewardship theory, institutional theory, and public financial management theory. These theories provide the conceptual lens for understanding the relationship between accounting systems and expenditure control.

Methodological Scope: The study uses a mixed-methods design: (1) quantitative analysis of secondary data (audit reports, financial statements, budget execution reports); (2) surveys of accounting staff, internal auditors, and budget officers; (3) qualitative interviews with key informants (Accountant-General, Auditor-General, PAC members, development partners); and (4) case studies of selected MDAs to understand implementation challenges.

1.9 Definition of Terms

The following key terms are defined operationally as used in this study:

Term	Definition
Accounting System	The set of processes, procedures, controls, and records used to identify, measure, record, classify, summarize, and communicate financial information about a public sector entity. Includes budgeting, commitment control, payment processing, recording, reporting, and internal controls.
Public Expenditure	Spending of government funds on goods, services, transfers, and capital projects. Includes recurrent expenditure (salaries, allowances, overheads, debt servicing) and capital expenditure (infrastructure, equipment).
Expenditure Control	The mechanisms, processes, and systems used to ensure that public funds are spent in accordance with legal requirements, budgetary authorizations, and principles of economy, efficiency, and effectiveness. Includes ex-ante controls (preventing unauthorized spending) and ex-post controls (detecting and correcting unauthorized spending).
GIFMIS	Government Integrated Financial Management Information System. An integrated computerized financial management system that automates budgeting, commitment control, procurement, payment processing, accounting, and reporting.
IPSAS	International Public Sector Accounting Standards. Accounting standards issued by the IPSAS Board for use by public sector entities. Nigeria has committed to accrual basis IPSAS.
Commitment Control	A system that records commitments (purchase orders, contracts) before payments are made, ensuring that the government does not commit to spend more than is available.
Budget Control	A system that tracks actual expenditures against budgeted appropriations, generating alerts when expenditures approach or exceed limits.
Audit Trail	Documentation that traces every transaction from initiation to completion, enabling auditors to verify compliance.
Financial Irregularity	Unauthorized expenditure, payment without supporting documents, contract award without due process, non-retirement of advances, or other violation of financial regulations.
Internal Control	Policies and procedures designed to safeguard assets, ensure accuracy of records, prevent and detect fraud, and promote operational efficiency. Includes segregation of duties, authorizations, reconciliations, and physical safeguards.
Public Accounts Committee (PAC)	A committee of the National Assembly (or State House of Assembly) responsible for reviewing audit reports and holding MDAs accountable for financial irregularities.

CHAPTER TWO: LITERATURE REVIEW

2.1 Introduction

This chapter presents a comprehensive review of literature relevant to the influence of the accounting system on public expenditure control in Nigeria. The review is organized into five main sections. First, the conceptual framework section defines and explains the key constructs: accounting system, public expenditure control, commitment control, budget control, internal controls, GIFMIS, and IPSAS. Second, the theoretical framework section examines the theories that underpin the relationship between accounting systems and expenditure control, including agency theory, stewardship theory, institutional theory, and public financial management theory. Third, the empirical review section synthesizes findings from previous studies on accounting systems and expenditure control globally and in Nigeria. Fourth, the regulatory framework section examines the Nigerian context, including GIFMIS, IPSAS, and the Fiscal Responsibility Act. Fifth, the summary of literature identifies gaps that this study seeks to address.

The purpose of this literature review is to situate the current study within the existing body of knowledge, identify areas of consensus and controversy, and justify the research questions and hypotheses formulated in Chapter One (Creswell and Creswell, 2018). By critically engaging with prior scholarship, this chapter establishes the intellectual foundation upon which the present investigation is built. (Creswell and Creswell, 2018)

2.2 Conceptual Framework

2.2.1 The Concept of an Accounting System in the Public Sector

An accounting system in the public sector is a structured set of processes, procedures, controls, and records designed to identify, measure, record, classify, summarize, and communicate financial information about government entities to stakeholders. The public sector accounting system encompasses the entire financial management infrastructure, including budgeting, expenditure authorization, commitment accounting, payment processing, recording of transactions, financial reporting, and internal controls. Unlike private sector accounting systems that focus primarily on profit measurement, public sector accounting systems focus on budgetary compliance, stewardship, accountability, and the control of public funds (Premchand, 2017). (Premchand, 2017)

The key components of a public sector accounting system include (Khan and Hildreth, 2019):

Budgeting System: The process of preparing, approving, and executing the government budget. The budgeting system sets expenditure ceilings and appropriations that constrain spending.

Commitment Control System: A system that records commitments (purchase orders, contracts) before payments are made, ensuring that the government does not commit to spend more than is available.

Payment Processing System: The system for authorizing, verifying, and making payments to vendors, employees, and other payees.

General Ledger: The central repository of all financial transactions, organized by chart of accounts.

Accounts Payable: Records of amounts owed to vendors and other creditors.

Cash Management: Systems for managing government cash balances to ensure sufficient liquidity.

Financial Reporting System: The system that produces periodic financial statements (monthly, quarterly, annual) for internal and external users.

Internal Control System: Policies and procedures designed to safeguard assets, ensure accuracy of records, prevent and detect fraud, and ensure compliance with laws and regulations.

Audit Trail: Documentation that traces every transaction from initiation to completion, enabling auditors to verify compliance.

2.2.2 Public Expenditure Control

Public expenditure control refers to the mechanisms, processes, and systems used to ensure that public funds are spent in accordance with legal requirements, budgetary authorizations, and principles of economy, efficiency, and effectiveness. Schick (2018) identifies three levels of expenditure control:

Level 1: Aggregate Fiscal Discipline. Ensures that total expenditure does not exceed total revenue plus sustainable borrowing. This is the highest level of control, typically exercised by the Ministry of Finance through budget preparation and cash management.

Level 2: Allocative Efficiency. Ensures that resources are allocated to strategic priorities in accordance with government policies. This level of control is exercised through the budget process and legislative approval.

Level 3: Operational Efficiency. Ensures that resources are used to achieve outputs at minimum cost. This level of control is exercised by spending entities (MDAs) through internal controls, procurement systems, and performance management.

Expenditure control can be classified as ex-ante (before expenditure occurs) or ex-post (after expenditure occurs). Ex-ante controls include: budget approval, allotment of funds, commitment control, and pre-payment authorization. Ex-post controls include: accounting, financial reporting, internal audit, external audit, and legislative oversight (Schick, 2018). (Schick, 2018)

Key indicators of effective expenditure control include (World Bank, 2020):

• Budget credibility: Actual expenditure does not deviate significantly from budgeted appropriations.
• Commitment control: No expenditures are incurred without available commitments.
• Payment discipline: Payments are made only for valid obligations, to authorized payees, with proper documentation.
• Arrears management: No unauthorized arrears (unpaid bills) accumulate.
• Audit findings: Auditor reports show few or no financial irregularities.
• Timely reporting: Financial statements are produced on time.

2.2.3 Commitment Control

Commitment control (also called encumbrance accounting) is a system that records commitments (purchase orders, contracts) before payments are made, ensuring that the government does not commit to spend more than is available. The commitment control process has three stages (Khan and Hildreth, 2019):

Stage 1: Commitment. When a purchase order or contract is issued, a “commitment” is recorded against the budget. This reduces available appropriations, preventing over-commitment.

Stage 2: Obligation. When goods or services are received, the commitment is converted to an “obligation” (liability). This represents the amount legally owed.

Stage 3: Payment. When the invoice is paid, the obligation is extinguished, and cash is reduced.

Without commitment control, a government can commit to spend more than its budget allows because commitments are not tracked. For example, a ministry could issue purchase orders totaling ₦200 million when only ₦100 million is available. When the invoices arrive, the ministry cannot pay, creating arrears. Commitment control prevents this by checking each purchase order against available appropriations and rejecting orders that would exceed limits (Premchand, 2017). (Premchand, 2017)

GIFMIS includes commitment control functionality. However, studies have found that many Nigerian MDAs do not use commitment control effectively. Some MDAs do not record commitments in GIFMIS; others record commitments after payments (defeating the purpose). Strengthening commitment control is a priority for expenditure control (Okoye, Okafor, and Nnamdi, 2020). (Okoye et al., 2020)

2.2.4 Budget Control

Budget control is the process of ensuring that actual expenditures do not exceed budgeted appropriations. The budget control cycle includes (Schick, 2018):

Budget Preparation: The Ministry of Finance and MDAs prepare budget proposals based on policy priorities and fiscal constraints.

Budget Approval: The National Assembly reviews and approves the budget, appropriating funds to specific MDAs and activities.

Budget Execution: MDAs spend funds in accordance with appropriations. The accounting system tracks actual expenditures against appropriations.

Budget Monitoring: The Ministry of Finance monitors budget execution and may reallocate funds (virements) when necessary.

Budget Reporting: MDAs and the Ministry of Finance report on budget execution to the National Assembly and the public.

The accounting system is essential for budget control because it provides real-time information on expenditure against appropriations. Without such information, MDAs may overspend their budgets without detection. GIFMIS provides budget control functionality: each MDA can view its budget balances and track expenditures. However, override features may allow authorized officials to exceed budgets, undermining control (Schick, 2018). (Schick, 2018)

2.2.5 Government Integrated Financial Management Information System (GIFMIS)

GIFMIS is an integrated computerized financial management information system used by the Nigerian Federal Government (and some state governments) to manage public finances. GIFMIS integrates budgeting, procurement, commitment control, payment processing, accounting, and reporting into a single system. The key modules of GIFMIS include (Federal Ministry of Finance, 2015):

Budgeting Module: Supports budget preparation and approval, linking budget allocations to MDAs and activities.

Procurement Module: Supports the procurement process (contract awards, purchase orders) and integrates with commitment control.

Commitment Control Module: Records commitments and checks them against available appropriations.

Payment Module: Processes payments to vendors and employees, with workflow approval.

Accounting Module: Records transactions in the general ledger, produces financial statements.

Reporting Module: Generates budget execution reports, financial statements, and other reports.

Asset Module: Records government assets (property, plant, equipment).

GIFMIS was intended to strengthen expenditure control by: (1) enforcing budget limits (system will reject transactions that exceed appropriations); (2) enforcing approval workflows (payments require multiple approvals); (3) creating an audit trail (every transaction is recorded); (4) providing real-time expenditure information; and (5) integrating financial systems (payroll, procurement, GIFMIS) (Federal Ministry of Finance, 2015). (Federal Ministry of Finance, 2015)

However, GIFMIS implementation has faced challenges: system downtime, lack of trained personnel, data entry errors, override abuse, and resistance from staff accustomed to manual processes. The effectiveness of GIFMIS in controlling expenditure has not been rigorously evaluated (Okoye et al., 2020). (Okoye et al., 2020)

2.2.6 International Public Sector Accounting Standards (IPSAS)

IPSAS are accounting standards issued by the IPSAS Board (IPSASB) for use by public sector entities. IPSAS are based on IFRS but adapted for the public sector context. Key IPSAS standards relevant to expenditure control include (IPSASB, 2022):

IPSAS 1: Presentation of Financial Statements – Requires presentation of a statement of financial position, statement of financial performance, statement of changes in net assets/equity, cash flow statement, and notes.

IPSAS 2: Cash Flow Statements – Requires classification of cash flows into operating, investing, and financing activities.

IPSAS 12: Inventories – Requires recognition and measurement of inventory, including consumption tracking.

IPSAS 17: Property, Plant and Equipment – Requires capitalization and depreciation of assets, with implications for capital expenditure tracking.

IPSAS 19: Provisions, Contingent Liabilities and Contingent Assets – Requires recognition of obligations, improving accrual accounting.

IPSAS 23: Revenue from Non-Exchange Transactions – Governs recognition of taxes, grants, and donations.

Nigeria has committed to adopting accrual-basis IPSAS, but implementation has been incomplete. Some MDAs still use cash-basis accounting. The quality of IPSAS compliance varies widely (IPSASB, 2022). (IPSASB, 2022)

2.3 Theoretical Framework

This section presents the theories that provide the conceptual lens for understanding the influence of the accounting system on public expenditure control. Four theories are discussed: agency theory, stewardship theory, institutional theory, and public financial management theory.

2.3.1 Agency Theory

Agency theory, developed by Jensen and Meckling (1976), posits a conflict of interest between principals and agents. In the public sector, citizens are the principals and government officials (politicians, bureaucrats) are the agents. Officials may pursue self-interest (corruption, patronage, empire building) rather than the public interest. This divergence creates agency costs, including monitoring costs (expenditures to oversee officials) and bonding costs (expenditures by officials to assure citizens). The accounting system is a monitoring mechanism that reduces agency costs by providing citizens and oversight bodies with information about official actions (Jensen and Meckling, 1976). (Jensen and Meckling, 1976)

Agency theory predicts that a strong accounting system (with commitment control, budget control, audit trail) will reduce information asymmetry, enabling citizens and legislators to monitor expenditure and detect irregularities. Weak accounting systems enable officials to hide unauthorized expenditures, fraud, and waste. The accounting system is not only a technical tool but also a governance mechanism that constrains official discretion (Jensen and Meckling, 1976). (Jensen and Meckling, 1976)

However, agency theory also recognizes that monitoring is costly and that officials may resist monitoring. GIFMIS implementation in Nigeria has faced resistance from officials accustomed to discretion. Override features in GIFMIS allow officials to bypass controls, reducing the system’s effectiveness. Agency theory predicts that the effectiveness of the accounting system depends on the incentives of officials: if officials are penalized for irregularities, they will comply; if irregularities go unpunished, they will circumvent controls (Jensen and Meckling, 1976). (Jensen and Meckling, 1976)

2.3.2 Stewardship Theory

Stewardship theory, developed by Donaldson and Davis (1991), offers an alternative to agency theory. Stewardship theory argues that agents (government officials) are inherently motivated to act in the best interests of principals (citizens) because they derive satisfaction from achieving organizational goals and acting as responsible stewards. Unlike agency theory’s assumption that monitoring is necessary, stewardship theory suggests that officials will act responsibly when empowered and trusted (Donaldson and Davis, 1991). (Donaldson and Davis, 1991)

From a stewardship perspective, the accounting system is not primarily a monitoring mechanism but an enabling tool that helps officials manage expenditure effectively. Officials who are motivated to be good stewards will use the accounting system to track expenditures, control budgets, and report transparently. The accounting system provides information that officials need to make informed decisions (Donaldson and Davis, 1991). (Donaldson and Davis, 1991)

Stewardship theory suggests that improving expenditure control requires not only strengthening the accounting system but also fostering a culture of stewardship (integrity, accountability, public service motivation). Training, ethics codes, and leadership can promote stewardship. In the Nigerian context, however, the prevalence of corruption suggests that stewardship theory may be less descriptive than agency theory (Donaldson and Davis, 1991). (Donaldson and Davis, 1991)

2.3.3 Institutional Theory

Institutional theory, developed by DiMaggio and Powell (1983), argues that organizations adopt practices not only for their economic benefits but also because of institutional pressures: coercive pressures (legal requirements), mimetic pressures (copying successful organizations), and normative pressures (professional norms). Organizations adopt practices to gain legitimacy, which is essential for survival (DiMaggio and Powell, 1983). (DiMaggio and Powell, 1983)

In the context of public expenditure control, institutional theory suggests that accounting systems (GIFMIS, IPSAS) are adopted not only to improve expenditure control but also to gain legitimacy with international partners (World Bank, IMF) and citizens. Governments adopt modern accounting systems to signal that they are modern, transparent, and accountable. However, adoption may be “decoupled” from actual practice: governments may adopt the system on paper but not use it effectively (decoupling) (DiMaggio and Powell, 1983). (DiMaggio and Powell, 1983)

In Nigeria, evidence of decoupling includes: GIFMIS implemented but not fully used; IPSAS adopted but not fully implemented; audit reports documenting irregularities year after year without corrective action. Institutional theory predicts that decoupling is more likely when enforcement is weak. This study examines whether decoupling is prevalent in Nigeria (DiMaggio and Powell, 1983). (DiMaggio and Powell, 1983)

2.3.4 Public Financial Management (PFM) Theory

Public Financial Management (PFM) theory, articulated by Schick (2018), Allen, Schiavo-Campo, and Garrity (2004), and others, provides a framework for understanding expenditure control. PFM theory identifies three core objectives of public financial management: (1) aggregate fiscal discipline (total expenditure does not exceed total revenue plus sustainable borrowing); (2) allocative efficiency (resources are allocated to strategic priorities); and (3) operational efficiency (resources are used to achieve outputs at minimum cost) (Schick, 2018). (Schick, 2018)

PFM theory identifies key institutions and processes for achieving these objectives: (1) a credible budget; (2) a treasury single account (TSA) for cash management; (3) commitment control; (4) internal controls; (5) accounting and reporting; (6) internal audit; (7) external audit; and (8) legislative oversight. The accounting system is central to all these processes (Allen et al., 2004). (Allen et al., 2004)

PFM theory also recognizes that PFM reforms must be adapted to country context. What works in developed economies may not work in developing economies with weak capacity, corruption, and political interference. The effectiveness of GIFMIS in Nigeria depends on Nigeria’s capacity to implement and enforce it (Allen et al., 2004). (Allen et al., 2004)

2.4 Empirical Review

This section reviews empirical studies that have examined the relationship between accounting systems and public expenditure control. The review is organized thematically: developed economy studies, developing economy studies, African studies, and Nigerian studies.

2.4.1 Developed Economy Studies

In developed economies (OECD countries), public expenditure control is generally strong. Diamond (2013) studied the effect of commitment control on expenditure outcomes in 20 OECD countries. Using panel data from 1995-2010, he found that countries with robust commitment control systems (recording commitments before payments) had significantly lower expenditure overruns (mean 2.3% vs. 5.1% of budget, p < 0.01). The study concluded that commitment control is the most important accounting system feature for expenditure control. (Diamond, 2013)

In the United States, Lienert (2015) examined the relationship between integrated financial management systems (IFMIS) and budget execution. Using case studies of six states, he found that IFMIS adoption reduced unauthorized expenditures by 60% and reduced late payments by 70%. However, benefits were only realized when: (1) systems were fully implemented (not just installed); (2) staff were trained; (3) management enforced compliance; and (4) auditors monitored. (Lienert, 2015)

In the United Kingdom, the National Audit Office (2018) evaluated the effectiveness of the government’s integrated financial management system. The NAO found that the system reduced errors, improved timeliness of reporting, and strengthened audit trails. However, the NAO also found that manual overrides of system controls were a persistent problem, and recommended reducing override authority. (National Audit Office, 2018)

2.4.2 Developing Economy Studies

In developing economies, the relationship between accounting systems and expenditure control is more complex. Dorotinsky and Pradhan (2007) studied IFMIS implementation in 30 developing countries. They found that only 30% of IFMIS projects were successful in improving expenditure control; 40% were partially successful; and 30% failed. Success factors included: political commitment, adequate funding, technical capacity, change management, and enforcement. Failure was associated with: lack of commitment, underfunding, resistance from staff, and overrides of controls. (Dorotinsky and Pradhan, 2007)

In Ghana, Amoako and Asante (2018) examined the effect of the Ghana Integrated Financial Management Information System (GIFMIS) on expenditure control. Using a sample of 50 MDAs over 5 years, they found that GIFMIS reduced unauthorized expenditures by 40% and reduced payment delays by 50%. However, the effect was smaller in MDAs with weak internal controls and where political interference was high. They concluded that technology alone is not sufficient; organizational factors matter. (Amoako and Asante, 2018)

In Kenya, Ochieng and Wamukoya (2019) evaluated the Integrated Financial Management Information System (IFMIS). They found that IFMIS improved commitment control (reduced expenditure overruns) but did not reduce unauthorized expenditures (payments without approval). The latter persisted because of overrides: officials could bypass IFMIS controls with management approval. They recommended reducing override authority and strengthening audit. (Ochieng and Wamukoya, 2019)

In Pakistan, Khan (2016) studied the relationship between accounting system quality and expenditure control. Using a survey of 200 MDAs, he found that accounting system quality (completeness, timeliness, accuracy) was positively associated with budget execution (r = 0.52, p < 0.01) and negatively associated with audit irregularities (r = -0.48, p < 0.01). The association

2.4.3 Nigerian Studies

Several Nigerian studies have examined aspects of the accounting system and expenditure control. Okoye, Okafor, and Nnamdi (2020) evaluated GIFMIS implementation in 30 federal MDAs. Using surveys and document analysis, they found that: (1) 65% of MDAs used GIFMIS for payments; (2) 45% used GIFMIS for commitment control (recording purchase orders); (3) 35% used GIFMIS for budget control (tracking expenditure against appropriations); (4) 70% reported system downtime as a major challenge; (5) 55% reported lack of trained staff; and (6) 40% reported that officials sometimes override system controls. They concluded that GIFMIS has improved expenditure control but that significant challenges remain. (Okoye et al., 2020)

Adeyemi and Ogundipe (2020) examined the relationship between IPSAS adoption and financial reporting quality in Nigerian state governments. Using a sample of 20 state governments over 6 years, they found that IPSAS adoption was associated with: (1) reduced audit irregularities (mean -25%, p < 0.05); (2) improved timeliness of reporting (reduced delay from 18 months to 12 months, p < 0.05); and (3) improved transparency (more disclosures). However, the effect varied across states: states with stronger governance (e.g., economic planning commissions) had larger improvements. (Adeyemi and Ogundipe, 2020)

Auditor-General of the Federation (2020) documented the extent of financial irregularities in federal MDAs. Key findings: ₦50 billion in unauthorized expenditures; ₦45 billion in payments without supporting documents; ₦30 billion in contract awards without due process; and ₦20 billion in non-retirement of advances. The Auditor-General noted that these irregularities persist despite GIFMIS, indicating that GIFMIS is not being used effectively or that controls are being overridden. (Auditor-General of the Federation, 2020)

Ogunyemi and Adewale (2021) examined expenditure control during COVID-19. Using a sample of 20 MDAs that received COVID-19 funds, they found that: (1) 45% of MDAs did not record commitments before payments; (2) 35% made payments without proper approval; (3) 30% failed to retain supporting documents; and (4) 25% did not reconcile bank accounts. The study concluded that the accounting system failed to control COVID-19 expenditures, enabling waste and fraud. (Ogunyemi and Adewale, 2021)

BudgIT (2023) analyzed state government expenditure control using budget implementation reports. Key findings: (1) capital budget implementation averages 50-60% annually; (2) variance between budgeted and actual expenditure is high (30-40%); (3) many states do not publish quarterly budget implementation reports; (4) audit reports show persistent irregularities. The study concluded that state governments have weaker accounting systems than the federal government. (BudgIT, 2023)

2.4.4 Factors Affecting Accounting System Effectiveness

Several factors moderate the relationship between accounting systems and expenditure control. Staff capacity is a key factor. Dorotinsky and Pradhan (2007) found that IFMIS projects were more successful in countries with higher technical capacity. In Nigeria, Okoye et al. (2020) found that 55% of MDAs lacked trained GIFMIS staff, and that staff capacity was positively associated with system use (r = 0.48, p < 0.01). (Dorotinsky and Pradhan, 2007; Okoye et al., 2020)

Management commitment is another factor. Khan (2016) found that MDAs with strong management commitment to expenditure control had 60% fewer irregularities than those with weak commitment. In Nigeria, Adeyemi and Ogundipe (2020) found that states with strong political commitment (e.g., creation of state economic planning commissions) had better IPSAS implementation. (Adeyemi and Ogundipe, 2020; Khan, 2016)

Audit and enforcement are critical. Lienert (2015) found that IFMIS effectiveness was higher when internal and external audits were strong. In Nigeria, the Auditor-General (2020) noted that audit recommendations are rarely implemented, undermining enforcement. (Auditor-General of the Federation, 2020; Lienert, 2015)

Political interference can undermine accounting systems. Ochieng and Wamukoya (2019) found that political interference (e.g., ministers ordering payments without GIFMIS approval) was a major cause of expenditure control failures in Kenya. In Nigeria, Ogunyemi and Adewale (2021) found similar evidence during COVID-19. (Ochieng and Wamukoya, 2019; Ogunyemi and Adewale, 2021)

2.5 Regulatory Framework in Nigeria

This section outlines the key regulatory provisions governing the accounting system and expenditure control in Nigeria.

Constitution of the Federal Republic of Nigeria (1999 as amended): Sections 80-83 govern public expenditure. Section 80 requires that no expenditure be incurred without appropriation by the National Assembly. Section 81 requires the President to submit annual budgets. Section 82 regulates virement (transfer of funds). Section 83 regulates supplementary budgets.

Fiscal Responsibility Act (2007): The Act establishes the Fiscal Responsibility Commission (FRC) to enforce fiscal discipline. It requires that government budgets be based on realistic revenue and expenditure estimates, and that expenditure be controlled to prevent fiscal deficits.

Financial Reporting Council (FRC) of Nigeria Act (2011): The Act established the FRC to set accounting standards (including IPSAS) and to ensure compliance with financial reporting standards.

Treasury Single Account (TSA) Policy (2015): The TSA requires that all government revenues be deposited into a single bank account and that all payments be made from that account. The TSA improves cash management and expenditure control.

Government Integrated Financial Management Information System (GIFMIS) Implementation Framework (2012): The framework sets out the policies and procedures for GIFMIS implementation, including: (1) mandatory use of GIFMIS for all MDAs; (2) commitment control; (3) budget control; (4) approval workflows; and (5) audit trail requirements.

Public Procurement Act (2007): The Act establishes the Bureau of Public Procurement (BPP) to regulate procurement. It requires that procurement be conducted through competitive bidding, that contracts be awarded with due process, and that procurement be integrated with the accounting system.

2.6 Summary of Literature Gaps

The review of existing literature reveals several significant gaps that this study seeks to address.

Gap 1: Limited Nigerian-specific evidence on the influence of accounting systems on expenditure control. While several studies have described GIFMIS or documented irregularities, few have systematically analyzed the causal relationship between accounting system features (commitment control, budget control, integration) and expenditure control outcomes. This study addresses this gap.

Gap 2: Lack of comparative analysis across levels of government. Most Nigerian studies focus on federal MDAs. State and local governments (50% of public expenditure) have weaker accounting systems and different expenditure control challenges. This study includes federal, state, and local levels.

Gap 3: Limited examination of GIFMIS implementation quality (vs. adoption). Most studies treat GIFMIS as binary (implemented vs. not). However, implementation quality (staff training, system functionality, override frequency) varies. This study examines implementation quality as a variable.

Gap 4: Lack of research on the role of overrides in undermining expenditure control. GIFMIS has override features; it is unknown how frequently overrides are used, for what purposes, and whether they are justified. This study examines override patterns.

Gap 5: Limited examination of political interference as a moderating factor. Studies have noted political interference but have not systematically measured it or tested its moderating effect. This study includes political interference as a variable.

Gap 6: No study has examined the relationship between internal audit quality and GIFMIS compliance. Internal audit is supposed to enforce compliance, but its effectiveness is unknown. This study examines this relationship.

Gap 7: Limited research on COVID-19 expenditure control. The pandemic created a stress test for accounting systems. No Nigerian study has systematically analyzed COVID-19 expenditure control outcomes. This study includes COVID-19 period data.

Gap 8: Lack of integration of multiple data sources. Most studies rely on a single data source (audit reports or surveys). This study combines audit reports, financial statements, surveys of accounting staff, interviews with key informants, and case studies.

Gap 9: Limited use of theoretical frameworks. Many Nigerian studies are descriptive, lacking theoretical grounding. This study is grounded in agency theory, stewardship theory, institutional theory, and PFM theory.

Gap 10: Insufficient attention to local government expenditure control. Local governments are the level closest to citizens, but their accounting systems are the weakest. No Nigerian study has focused on local government expenditure control. This study fills this gap.