EFFECT OF INTERNATIONAL FINANCIAL REPORTING STANDARDS ON COMPANY PERFORMANCE RATIOS: STUDY OF QUOTED COMPANIES IN NIGERIA

CHAPTER ONE: INTRODUCTION

1.1 Background to the Study

International Financial Reporting Standards (IFRS) are a set of accounting standards developed by the International Accounting Standards Board (IASB) to provide a common global language for business affairs so that company accounts are comparable and understandable across international boundaries. IFRS have been adopted by over 140 countries worldwide, including the European Union, Australia, Canada, and numerous countries in Asia, Africa, and South America. The primary objective of IFRS is to enhance the quality, transparency, and comparability of financial information, thereby enabling investors, creditors, and other users to make informed economic decisions. IFRS are principles-based standards, requiring professional judgment in their application, in contrast to rules-based standards such as US GAAP (IFRS Foundation, 2021; IASB, 2018).

Nigeria officially adopted IFRS as the financial reporting framework for publicly traded companies and significant public interest entities effective from January 1, 2012. The adoption was mandated by the Financial Reporting Council of Nigeria (FRCN) as part of broader reforms to improve the quality of financial reporting, attract foreign investment, and integrate Nigerian capital markets with global financial markets. The transition from Nigerian Generally Accepted Accounting Principles (Nigerian GAAP, also known as Statement of Accounting Standards – SAS) to IFRS required companies to adjust their accounting policies, systems, and processes. The adoption was phased: (a) publicly listed companies and significant public interest entities adopted IFRS from January 1, 2012, (b) other public interest entities adopted from January 1, 2013, (c) small and medium-sized entities adopted IFRS for SMEs from January 1, 2014 (FRCN, 2014; Adebayo and Oyedokun, 2019).

Company performance ratios are quantitative measures derived from financial statements that assess various aspects of a company’s financial health, including profitability, liquidity, solvency, efficiency, and market performance. Key performance ratios include: (a) profitability ratios – return on assets (ROA), return on equity (ROE), net profit margin, gross profit margin, (b) liquidity ratios – current ratio, quick ratio, cash ratio, (c) solvency ratios – debt-to-equity ratio, debt-to-assets ratio, interest coverage ratio, (d) efficiency ratios – inventory turnover, accounts receivable turnover, asset turnover, and (e) market ratios – earnings per share (EPS), price-earnings (P/E) ratio, dividend yield. These ratios are used by investors, creditors, analysts, and management to evaluate performance, compare companies, and make investment and credit decisions (Brigham and Ehrhardt, 2017; Ross, Westerfield, and Jordan, 2019).

The transition from Nigerian GAAP to IFRS had significant implications for the computation and interpretation of performance ratios. Key differences between Nigerian GAAP and IFRS that affect performance ratios include:

Financial Statement Presentation: IFRS requires a statement of comprehensive income (which includes both profit or loss and other comprehensive income), a statement of financial position (balance sheet), a statement of changes in equity, a statement of cash flows (IAS 7), and notes. Nigerian GAAP had different presentation formats, affecting line items and subtotals used in ratio calculations (IASB, 2018).

Revenue Recognition: IFRS 15 (Revenue from Contracts with Customers) introduced a five-step model for revenue recognition, which differs from previous Nigerian GAAP guidance. The timing and amount of revenue recognized can affect profitability ratios (profit margin, ROA, ROE). For example, revenue from long-term contracts may be recognized over time under IFRS, whereas under Nigerian GAAP, it may have been recognized upon completion (IFRS Foundation, 2021).

Property, Plant, and Equipment (PPE) : IAS 16 permits the cost model (depreciated historical cost) or the revaluation model (fair value). IFRS requires component depreciation (depreciating significant parts of an asset separately). Nigerian GAAP had simpler depreciation rules. The choice of model and depreciation method affects asset values (total assets), depreciation expense (affecting profit), and therefore ROA, ROE, and asset turnover (Kieso, Weygandt, and Warfield, 2019).

Leases: IFRS 16 (Leases) requires lessees to recognize right-of-use assets and lease liabilities for all leases (with limited exceptions). Under previous Nigerian GAAP (which followed IAS 17), operating leases were off-balance-sheet. IFRS 16 increases total assets and total liabilities, affecting ROA (denominator increases, reducing ROA), debt-to-equity ratio (liabilities increase), and asset turnover (assets increase) (IFRS Foundation, 2021).

Financial Instruments: IFRS 9 (Financial Instruments) introduces an expected credit loss (ECL) model for impairment of financial assets, replacing the incurred loss model under Nigerian GAAP (which followed IAS 39). ECL provisions are recognized earlier, potentially reducing profits and assets (through provision for credit losses). This affects profitability ratios (lower profit) and asset quality measures. IFRS 9 also requires fair value measurement for many financial instruments, affecting asset values and equity (through other comprehensive income) (IFRS Foundation, 2021).

Inventories: IAS 2 (Inventories) prohibits LIFO (Last-In-First-Out) as a cost formula. Nigerian GAAP (SAS 4) permitted LIFO. Companies that used LIFO had to change to FIFO (First-In-First-Out) or weighted average cost upon IFRS adoption. During periods of rising prices (inflation), FIFO produces lower cost of goods sold (COGS), higher profit, and higher inventory values compared to LIFO. This affects profitability ratios (higher profit margin), liquidity ratios (higher current ratio due to higher inventory), and efficiency ratios (inventory turnover) (Kieso et al., 2019).

Income Taxes: IAS 12 (Income Taxes) requires full recognition of deferred tax assets and liabilities for temporary differences between accounting and tax bases. Nigerian GAAP had less comprehensive deferred tax accounting. Deferred tax recognition affects tax expense, profit, and equity, affecting profitability ratios and return measures (IFRS Foundation, 2021).

Employee Benefits: IAS 19 (Employee Benefits) requires recognition of actuarial gains and losses on defined benefit pension plans in other comprehensive income (or in profit or loss under some options). Nigerian GAAP had simpler accounting for pensions. This affects total comprehensive income and equity (through other comprehensive income), affecting return measures if comprehensive income is considered (Kieso et al., 2019).

Fair Value Measurement: IFRS 13 (Fair Value Measurement) provides a single framework for measuring fair value and requires extensive disclosures. Fair value measurement for assets (e.g., investment property, biological assets, financial instruments) affects asset values and equity, affecting ROA, ROE, and debt-to-equity ratios. Fair value changes may be recognized in profit or loss or other comprehensive income, affecting profitability (IFRS Foundation, 2021).

Share-Based Payments: IFRS 2 (Share-Based Payment) requires recognition of share-based payment transactions (e.g., employee share options) as an expense. Nigerian GAAP did not have comprehensive guidance. Recognition of share-based payment expense reduces profit, affecting profitability ratios (Penman, 2018).

Business Combinations: IFRS 3 (Business Combinations) requires the acquisition method (purchase method) with fair value measurement of identifiable assets and liabilities acquired, recognition of goodwill, and annual impairment testing (not amortisation). Nigerian GAAP had different treatment (amortisation of goodwill). This affects asset values (goodwill), profit (amortisation vs. impairment), and therefore ROA, ROE, and other ratios (Kieso et al., 2019).

The effect of IFRS adoption on performance ratios is an empirical question. In theory, IFRS could improve the quality (relevance, reliability, comparability) of financial information, leading to more accurate performance ratios. However, IFRS also introduces more judgment and estimation (e.g., fair value measurement, expected credit losses), which could increase variability and reduce comparability across companies (if different estimates are used). The net effect on performance ratios is uncertain and may vary by company, industry, and country (Barth, Landsman, and Lang, 2008; De George, Li, and Shivakumar, 2016).

Empirical studies on the effect of IFRS adoption on performance ratios have produced mixed results. Studies in developed markets (Europe, Australia) generally found that IFRS adoption improved earnings quality, reduced earnings management, and increased comparability. However, studies in emerging markets (including Nigeria) have found mixed results; some found improvements in accounting quality, while others found no significant change or even deterioration (due to implementation challenges). For quoted companies in Nigeria, a few studies have examined the impact of IFRS adoption on earnings quality, but limited research exists on the effect of IFRS on performance ratios (Adebayo and Oyedokun, 2019; Okafor and Udeh, 2020).

This study focuses on quoted companies in Nigeria for several reasons. First, quoted companies were the first to adopt IFRS (2012), providing a longer time series for analysis. Second, quoted companies have publicly available financial statements, enabling ratio analysis. Third, quoted companies are subject to stricter regulatory oversight (Nigerian Exchange Limited, Securities and Exchange Commission), increasing the quality of financial data. Fourth, quoted companies represent a cross-section of industries (manufacturing, banking, oil and gas, telecommunications, consumer goods, services), allowing industry-specific analysis. Fifth, the performance ratios of quoted companies are closely watched by investors, analysts, and regulators (Nigeria Exchange Group, 2022).

The analysis of performance ratios before and after IFRS adoption (pre-IFRS period: e.g., 2007-2011; post-IFRS period: 2012-2023) enables assessment of the impact of IFRS on: (a) the levels of ratios (e.g., did ROA increase or decrease after IFRS?), (b) the volatility of ratios (e.g., did IFRS increase or decrease ratio variability?), (c) the comparability of ratios across companies (e.g., did IFRS reduce cross-sectional dispersion?), (d) the predictive ability of ratios (e.g., can ratios better predict future performance after IFRS?), and (e) the value relevance of ratios (e.g., are ratios more strongly associated with share prices after IFRS?) (Penman, 2018; Okafor and Udeh, 2020).

Finally, this study contributes to the literature on IFRS adoption in Nigeria by providing empirical evidence on the effect of IFRS on company performance ratios. The findings will inform investors, analysts, creditors, regulators, and standard-setters about the impact of IFRS on financial analysis and decision-making. The study also contributes to the international literature on IFRS adoption in emerging markets (Yin, 2018; Creswell and Creswell, 2018).

1.2 Statement of the Problem

Quoted companies in Nigeria adopted IFRS from January 1, 2012, transitioning from Nigerian GAAP (SAS). The adoption of IFRS introduced significant changes in accounting policies, measurement bases, recognition criteria, and disclosure requirements. These changes have direct and indirect effects on the computation and interpretation of key performance ratios used by investors, analysts, creditors, and other stakeholders to evaluate company performance, compare companies, and make investment and credit decisions. However, the effect of IFRS adoption on performance ratios of quoted companies in Nigeria is not well understood. Specific problems include:

1. Lack of empirical evidence: There is limited empirical research on how IFRS adoption has affected profitability ratios (ROA, ROE, profit margins), liquidity ratios (current ratio, quick ratio), solvency ratios (debt-to-equity), efficiency ratios (turnover ratios), and market ratios (EPS, P/E) for Nigerian quoted companies.
2. Inconsistent findings: Existing studies on IFRS adoption in Nigeria have produced mixed and sometimes conflicting results, with some studies reporting improvements in earnings quality and others reporting no significant change or deterioration. The effect on performance ratios is even less studied.
3. Methodological challenges: Comparing pre-IFRS and post-IFRS ratios requires careful adjustment for changes in accounting policies, and it is difficult to isolate the effect of IFRS from other factors (economic conditions, firm-specific factors). Many studies have methodological limitations.
4. Industry differences: The impact of IFRS may vary across industries (banking, manufacturing, oil and gas, telecommunications) due to industry-specific accounting issues (e.g., loan loss provisioning for banks, revenue recognition for construction companies). Little research exists on industry-specific effects.
5. Investor and analyst confusion: Investors and analysts may not fully understand how IFRS changes affect performance ratios, leading to misinterpretation of financial statements and suboptimal investment decisions.
6. Regulatory and policy implications: Regulators (FRCN, SEC, NGX) and standard-setters (IASB) need evidence on the impact of IFRS adoption to inform future standards, guidance, and enforcement.
7. International comparability: IFRS adoption was intended to improve comparability of Nigerian companies with international peers. However, limited evidence exists on whether IFRS has actually improved ratio comparability.
8. Transition adjustments: Companies made transition adjustments to retained earnings upon first-time adoption of IFRS (IFRS 1). These adjustments affected equity and therefore ROE and debt-to-equity ratios. The magnitude and impact of these adjustments have not been systematically analysed.

This study addresses these problems by providing a comprehensive empirical analysis of the effect of IFRS adoption on company performance ratios of quoted companies in Nigeria.

1.3 Objectives of the Study

The specific objectives of this study are to:

1. Examine the performance ratios (profitability, liquidity, solvency, efficiency, and market ratios) of quoted companies in Nigeria for the pre-IFRS period (2007-2011) and post-IFRS period (2012-2023).
2. Compare the profitability ratios (ROA, ROE, net profit margin) of quoted companies in Nigeria before and after IFRS adoption.
3. Compare the liquidity ratios (current ratio, quick ratio) of quoted companies in Nigeria before and after IFRS adoption.
4. Compare the solvency ratios (debt-to-equity ratio, interest coverage ratio) of quoted companies in Nigeria before and after IFRS adoption.
5. Compare the efficiency ratios (inventory turnover, asset turnover) of quoted companies in Nigeria before and after IFRS adoption.
6. Compare the market ratios (earnings per share EPS, price-earnings P/E ratio) of quoted companies in Nigeria before and after IFRS adoption.
7. Determine whether the changes in performance ratios after IFRS adoption are statistically significant.
8. Identify industry-specific effects of IFRS adoption on performance ratios.

1.4 Research Questions

The following research questions guide this study:

1. What are the mean profitability ratios (ROA, ROE, net profit margin) of quoted companies in Nigeria for the pre-IFRS period (2007-2011) and post-IFRS period (2012-2023), and is there a statistically significant difference between the two periods?
2. What are the mean liquidity ratios (current ratio, quick ratio) of quoted companies in Nigeria for the pre-IFRS and post-IFRS periods, and is there a statistically significant difference between the two periods?
3. What are the mean solvency ratios (debt-to-equity ratio, interest coverage ratio) of quoted companies in Nigeria for the pre-IFRS and post-IFRS periods, and is there a statistically significant difference between the two periods?
4. What are the mean efficiency ratios (inventory turnover, asset turnover) of quoted companies in Nigeria for the pre-IFRS and post-IFRS periods, and is there a statistically significant difference between the two periods?
5. What are the mean market ratios (EPS, P/E ratio) of quoted companies in Nigeria for the pre-IFRS and post-IFRS periods, and is there a statistically significant difference between the two periods?
6. Do the effects of IFRS adoption on performance ratios vary across industries (banking, manufacturing, oil and gas, telecommunications, consumer goods)?

1.5 Hypotheses of the Study

The following hypotheses are formulated in null (H₀) and alternative (H₁) forms:

Hypothesis One (Profitability Ratios)

• H₀: There is no significant difference in the return on assets (ROA) of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.
• H₁: There is a significant difference in the return on assets (ROA) of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.

Hypothesis Two (Profitability Ratios)

• H₀: There is no significant difference in the return on equity (ROE) of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.
• H₁: There is a significant difference in the return on equity (ROE) of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.

Hypothesis Three (Liquidity Ratios)

• H₀: There is no significant difference in the current ratio of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.
• H₁: There is a significant difference in the current ratio of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.

Hypothesis Four (Solvency Ratios)

• H₀: There is no significant difference in the debt-to-equity ratio of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.
• H₁: There is a significant difference in the debt-to-equity ratio of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.

Hypothesis Five (Efficiency Ratios)

• H₀: There is no significant difference in the asset turnover ratio of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.
• H₁: There is a significant difference in the asset turnover ratio of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.

Hypothesis Six (Market Ratios)

• H₀: There is no significant difference in the earnings per share (EPS) of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.
• H₁: There is a significant difference in the earnings per share (EPS) of quoted companies in Nigeria between the pre-IFRS and post-IFRS periods.

1.6 Scope of the Study

This study focuses on the effect of International Financial Reporting Standards (IFRS) adoption on company performance ratios of quoted companies in Nigeria. Geographically, the research is limited to quoted companies (publicly listed companies) on the Nigerian Exchange Limited (NGX). The study covers a sample of quoted companies across major sectors: banking, manufacturing (consumer goods, industrial goods), oil and gas, telecommunications, healthcare, agriculture, and services. The study period covers the pre-IFRS period (2007-2011, five years before IFRS adoption) and the post-IFRS period (2012-2023, twelve years after IFRS adoption). Content-wise, the study examines the following performance ratios: profitability ratios (ROA, ROE, net profit margin, gross profit margin); liquidity ratios (current ratio, quick ratio); solvency ratios (debt-to-equity ratio, debt-to-assets ratio, interest coverage ratio); efficiency ratios (inventory turnover, accounts receivable turnover, asset turnover); and market ratios (earnings per share EPS, price-earnings P/E ratio, dividend per share). The study analyzes secondary data from annual reports, financial statements, and NGX filings. The study does not cover unquoted companies (private companies), nor does it cover IFRS for SMEs (small and medium-sized entities), nor does it cover companies that adopted IFRS after 2012 (late adopters), nor does it cover the banking sector’s specific regulatory requirements (CBN prudential guidelines) except as they relate to IFRS.

1.7 Significance of the Study

This study is significant for several stakeholders. First, investors and financial analysts will benefit from understanding how IFRS adoption affects performance ratios, enabling them to adjust their analysis and interpretation of financial statements, compare pre-IFRS and post-IFRS ratios correctly, and make informed investment decisions. Second, quoted companies (management and finance departments) will benefit from understanding the impact of IFRS on their reported performance ratios, enabling them to explain changes to stakeholders and manage investor expectations. Third, the Financial Reporting Council of Nigeria (FRCN) will gain insights into the effects of IFRS adoption on financial reporting quality and performance metrics, informing future standard-setting, guidance, and enforcement. Fourth, the Nigerian Exchange Limited (NGX) and the Securities and Exchange Commission (SEC) will benefit from understanding how IFRS affects the comparability and transparency of financial information, informing listing requirements and investor protection measures. Fifth, the International Accounting Standards Board (IASB) will gain insights from the Nigerian experience of IFRS adoption in an emerging market, informing future standards and implementation guidance. Sixth, academics and researchers in financial accounting, international accounting, and capital markets will benefit from the study’s contribution to the literature on IFRS adoption in emerging economies. Seventh, professional bodies (ICAN, ANAN, ACCA) will find value in the study’s findings for training, CPD programs, and guidance to members. Eighth, auditors will benefit from understanding the impact of IFRS on audit areas (e.g., estimates, fair value, impairment), informing audit planning and procedures. Ninth, policymakers and regulators will gain insights into the effects of accounting standards on economic outcomes, informing policy decisions. Finally, the broader Nigerian capital market will benefit as improved understanding of IFRS effects leads to better-informed investors, more efficient pricing, and increased market participation.

1.8 Operational Definition of Terms

International Financial Reporting Standards (IFRS): A set of accounting standards issued by the International Accounting Standards Board (IASB), adopted in Nigeria from January 1, 2012, for quoted companies.

Nigerian GAAP (Statement of Accounting Standards – SAS): The previous accounting standards used in Nigeria before IFRS adoption, issued by the Nigerian Accounting Standards Board (NASB).

Quoted Companies: Publicly listed companies whose shares are traded on the Nigerian Exchange Limited (NGX).

Performance Ratios: Financial metrics derived from financial statements used to assess company performance, including profitability, liquidity, solvency, efficiency, and market ratios.

Return on Assets (ROA): Net profit divided by total assets; measures how efficiently a company uses its assets to generate profit.

Return on Equity (ROE): Net profit divided by shareholders’ equity; measures the return earned on owners’ investment.

Net Profit Margin: Net profit divided by revenue; measures overall profitability after all expenses.

Gross Profit Margin: Gross profit (revenue minus cost of goods sold) divided by revenue; measures profitability after direct production costs.

Current Ratio: Current assets divided by current liabilities; measures ability to pay short-term obligations.

Quick Ratio (Acid-Test Ratio): (Current assets minus inventory) divided by current liabilities; a more stringent measure of liquidity.

Debt-to-Equity Ratio: Total liabilities divided by shareholders’ equity; measures the relative claims of creditors versus owners.

Debt-to-Assets Ratio: Total liabilities divided by total assets; measures the proportion of assets financed by debt.

Interest Coverage Ratio: Earnings before interest and taxes (EBIT) divided by interest expense; measures ability to pay interest.

Inventory Turnover: Cost of goods sold divided by average inventory; measures how many times inventory is sold and replaced.

Accounts Receivable Turnover: Credit sales divided by average accounts receivable; measures how quickly customers pay their bills.

Asset Turnover: Revenue divided by total assets; measures how efficiently assets generate sales.

Earnings Per Share (EPS): Net profit divided by number of outstanding shares; measures profit attributable to each share.

Price-Earnings (P/E) Ratio: Share price divided by earnings per share; measures the market’s valuation relative to earnings.

Pre-IFRS Period: The period before IFRS adoption (2007-2011) when companies used Nigerian GAAP (SAS).

Post-IFRS Period: The period after IFRS adoption (2012-2023) when companies used IFRS.

Transition Adjustments: Adjustments to retained earnings and other equity accounts upon first-time adoption of IFRS (IFRS 1).

Expected Credit Loss (ECL): The forward-looking estimate of credit losses on financial assets under IFRS 9, replacing the incurred loss model.

Fair Value: The price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (IFRS 13).

Right-of-Use Asset: An asset recognised by a lessee under IFRS 16 representing the right to use a leased asset over the lease term.

Lease Liability: A liability recognised by a lessee under IFRS 16 representing the obligation to make lease payments.

Component Depreciation: Depreciating significant parts of an asset separately under IAS 16.

Revaluation Model: An accounting policy under IAS 16 allowing property, plant, and equipment to be carried at revalued amount (fair value) less subsequent depreciation.

Cost Model: An accounting policy under IAS 16 carrying property, plant, and equipment at historical cost less accumulated depreciation and impairment losses.

Impairment Loss: The amount by which the carrying amount of an asset exceeds its recoverable amount (IAS 36).

Deferred Tax: Tax payable or recoverable in future periods due to temporary differences between accounting and tax bases (IAS 12).

Other Comprehensive Income (OCI): Items of income and expense not recognised in profit or loss under IFRS, including revaluation surpluses and actuarial gains/losses on defined benefit plans.

First-Time Adoption (IFRS 1): The standard providing guidance for entities adopting IFRS for the first time, including exemptions and transition adjustments.

CHAPTER TWO: REVIEW OF RELATED LITERATURE

2.1 Conceptual Framework

A conceptual framework is a structural representation of the key concepts or variables in a study and the hypothesized relationships among them. It serves as the analytical lens through which the researcher organizes the study, selects appropriate methodology, and interprets findings. In this study, the conceptual framework is built around two primary constructs: International Financial Reporting Standards (IFRS) Adoption (the independent variable) and Company Performance Ratios (the dependent variable). Additionally, the framework identifies the specific dimensions of each construct and the mediating and moderating variables that influence the relationship (Miles, Huberman, and Saldaña, 2020).

2.1.1 Independent Variable: International Financial Reporting Standards (IFRS) Adoption

International Financial Reporting Standards (IFRS) adoption, the independent variable in this study, refers to the transition from Nigerian Generally Accepted Accounting Principles (Nigerian GAAP, also known as Statement of Accounting Standards – SAS) to IFRS as the financial reporting framework for quoted companies in Nigeria, effective from January 1, 2012. For the purpose of this study, IFRS adoption is conceptualized along several key dimensions that directly affect the computation of performance ratios (IFRS Foundation, 2021; IASB, 2018).

Measurement Bases: IFRS introduces fair value measurement for many assets and liabilities (IFRS 13), whereas Nigerian GAAP was predominantly historical cost. Fair value measurement affects asset values, liability values, and equity, thereby affecting ratios such as return on assets (ROA), return on equity (ROE), debt-to-equity ratio, and asset turnover.

Recognition Criteria: IFRS changes the timing of recognition for revenues (IFRS 15), leases (IFRS 16), financial instruments (IFRS 9), and provisions (IAS 37). Changes in recognition timing affect reported revenues, expenses, assets, and liabilities, thereby affecting profitability ratios, liquidity ratios, and solvency ratios.

Presentation and Disclosure: IFRS requires different presentation formats (statement of comprehensive income, statement of financial position, statement of cash flows) and extensive disclosures. Changes in presentation affect line items and subtotals used in ratio calculations.

Accounting Policy Choices: IFRS permits certain accounting policy choices (e.g., cost model vs. revaluation model for PPE, proportionate consolidation vs. equity method for joint ventures). The choice of accounting policies affects financial statement amounts and ratios.

Estimates and Judgments: IFRS requires more extensive use of estimates and judgments (e.g., expected credit losses under IFRS 9, fair value measurement under IFRS 13, impairment testing under IAS 36). Different estimates and judgments across companies affect comparability of ratios.

2.1.2 Dependent Variable: Company Performance Ratios

Company performance ratios, the dependent variable in this study, are quantitative measures derived from financial statements that assess various aspects of a company’s financial health. For the purpose of this study, performance ratios are conceptualized along five key dimensions (Brigham and Ehrhardt, 2017; Ross, Westerfield, and Jordan, 2019).

Profitability Ratios: These ratios measure a company’s ability to generate earnings relative to revenue, assets, or equity. Key profitability ratios include:

• Return on Assets (ROA) = Net Profit ÷ Total Assets. Measures how efficiently assets are used to generate profit.
• Return on Equity (ROE) = Net Profit ÷ Shareholders’ Equity. Measures the return earned on owners’ investment.
• Net Profit Margin = Net Profit ÷ Revenue. Measures overall profitability after all expenses.
• Gross Profit Margin = (Revenue – Cost of Goods Sold) ÷ Revenue. Measures profitability after direct production costs.
• Operating Profit Margin = Operating Profit ÷ Revenue. Measures profitability from core operations.

Liquidity Ratios: These ratios measure a company’s ability to meet its short-term obligations. Key liquidity ratios include:

• Current Ratio = Current Assets ÷ Current Liabilities. Measures ability to pay short-term obligations with short-term assets.
• Quick Ratio (Acid-Test Ratio) = (Current Assets – Inventory) ÷ Current Liabilities. A more stringent measure excluding inventory.

Solvency Ratios: These ratios measure a company’s ability to meet its long-term obligations and the extent of debt financing. Key solvency ratios include:

• Debt-to-Equity Ratio = Total Liabilities ÷ Shareholders’ Equity. Measures the relative claims of creditors versus owners.
• Debt-to-Assets Ratio = Total Liabilities ÷ Total Assets. Measures the proportion of assets financed by debt.
• Interest Coverage Ratio = Earnings Before Interest and Taxes (EBIT) ÷ Interest Expense. Measures ability to pay interest from operating profit.

Efficiency Ratios: These ratios measure how effectively a company uses its assets. Key efficiency ratios include:

• Inventory Turnover = Cost of Goods Sold ÷ Average Inventory. Measures how many times inventory is sold and replaced.
• Accounts Receivable Turnover = Credit Sales ÷ Average Accounts Receivable. Measures how quickly customers pay their bills.
• Asset Turnover = Revenue ÷ Total Assets. Measures how efficiently assets generate sales.

Market Ratios: These ratios measure the market’s perception of a company’s performance and value. Key market ratios include:

• Earnings Per Share (EPS) = Net Profit ÷ Number of Outstanding Shares. Measures profit attributable to each share.
• Price-Earnings (P/E) Ratio = Share Price ÷ Earnings Per Share. Measures the market’s valuation relative to earnings.
• Dividend Per Share (DPS) = Dividends Paid ÷ Number of Outstanding Shares.
• Dividend Yield = Dividend Per Share ÷ Share Price.

2.1.3 Relationship between IFRS Adoption and Performance Ratios

The conceptual framework posits that IFRS adoption affects performance ratios through several mechanisms. First, changes in measurement bases (historical cost vs. fair value) affect asset and liability values, thereby affecting ROA (denominator changes), ROE (denominator changes), debt-to-equity ratio (both numerator and denominator change), and asset turnover (denominator changes). Second, changes in recognition criteria affect the timing and amount of revenues and expenses, thereby affecting profitability ratios (profit margins, ROA, ROE). Third, changes in presentation affect line items and subtotals used in ratio calculations, potentially affecting the comparability of ratios across periods. Fourth, accounting policy choices allow management discretion, leading to potential variation in ratios across companies even when economic substance is similar, reducing comparability. Fifth, estimates and judgments introduce variability across companies and periods, affecting the reliability and comparability of ratios (De George, Li, and Shivakumar, 2016; Barth, Landsman, and Lang, 2008).

The framework also identifies moderating variables that influence the relationship between IFRS adoption and performance ratios. These include: (a) industry – the effect of IFRS may vary across industries due to industry-specific accounting issues (e.g., loan loss provisioning for banks, revenue recognition for construction companies), (b) firm size – larger firms may have more resources to implement IFRS effectively, (c) enforcement and regulatory environment – the effectiveness of IFRS adoption depends on the quality of enforcement by regulators (FRCN, SEC, NGX), (d) audit quality – high-quality auditors (Big 4) may ensure more consistent application of IFRS, (e) ownership structure – firms with concentrated ownership may have less pressure for transparent reporting, and (f) economic conditions – macroeconomic factors (inflation, exchange rates, interest rates) affect financial statement amounts and ratios independently of IFRS.

2.1.4 Summary of Conceptual Framework

The conceptual framework for this study links IFRS adoption (independent variable) to company performance ratios (dependent variable) across five dimensions (profitability, liquidity, solvency, efficiency, market). The framework acknowledges that the relationship is moderated by industry, firm size, enforcement, audit quality, ownership structure, and economic conditions. The framework guides the empirical analysis (comparison of pre-IFRS and post-IFRS ratios) and the interpretation of findings.

2.2 Theoretical Framework

A theoretical framework is a collection of interrelated concepts, definitions, and propositions that present a systematic view of phenomena by specifying relationships among variables, with the purpose of explaining and predicting those phenomena. In this study, five major theories are adopted to explain the relationship between IFRS adoption and company performance ratios: the Decision-Usefulness Theory, the Agency Theory, the Positive Accounting Theory, the Signaling Theory, and the Institutional Theory. These theories collectively provide a robust lens for understanding how IFRS affects performance ratios (IASB, 2018; Jensen and Meckling, 1976; Watts and Zimmerman, 1986; Spence, 1973; DiMaggio and Powell, 1983).

2.2.1 Decision-Usefulness Theory

The Decision-Usefulness Theory is the foundation of the IASB’s Conceptual Framework for Financial Reporting. The theory posits that the primary objective of financial reporting is to provide information that is useful to existing and potential investors, lenders, and other creditors in making decisions about providing resources to the entity. The theory identifies two fundamental qualitative characteristics of useful financial information: relevance (information can make a difference in users’ decisions) and faithful representation (information is complete, neutral, and free from error). Enhancing qualitative characteristics include comparability, verifiability, timeliness, and understandability (IASB, 2018).

In the context of this study, Decision-Usefulness Theory explains why IFRS adoption is expected to improve the quality of performance ratios. IFRS is designed to produce more relevant (e.g., fair value measurement) and faithfully representative (e.g., comprehensive disclosure) financial information. Performance ratios computed from IFRS-based financial statements should therefore be more useful for decision-making (investment, credit, valuation). The theory predicts that performance ratios post-IFRS will be more strongly associated with share prices (value relevance), more predictive of future cash flows, and more comparable across companies (Barth et al., 2008).

However, critics argue that IFRS’s increased use of fair value measurement and estimates reduces reliability (faithful representation) because fair values may be unobservable (Level 3) and estimates may be biased or manipulated. Therefore, the net effect on decision-usefulness is an empirical question (De George et al., 2016).

2.2.2 Agency Theory

Agency Theory, developed by Jensen and Meckling (1976), describes the relationship between principals (shareholders) and agents (managers). The theory posits that managers (agents) may not always act in the best interests of shareholders (principals) due to information asymmetry (managers have more information about the firm than shareholders) and divergent interests (managers may pursue personal goals such as bonuses, job security, empire building). This divergence creates agency costs, including monitoring costs (expenditures to oversee manager behavior), bonding costs (expenditures by managers to assure shareholders of their fidelity), and residual loss (the value lost when manager decisions deviate from shareholder interests) (Jensen and Meckling, 1976).

In the context of this study, Agency Theory predicts that managers may engage in earnings management (manipulation of reported earnings) to achieve personal objectives (e.g., meet bonus targets, avoid debt covenant violations, increase share price). The transition from Nigerian GAAP to IFRS changes the set of accounting rules and the discretion available to managers. IFRS is principles-based, requiring more judgment and estimation than rules-based Nigerian GAAP. This increased discretion could increase earnings management (if managers exploit discretion opportunistically) or decrease earnings management (if IFRS requires more disclosure, making earnings management more detectable). The effect on earnings management affects performance ratios (profitability ratios, earnings per share) (Watts and Zimmerman, 1986).

Agency Theory also suggests that IFRS adoption could reduce information asymmetry between managers and shareholders, enabling better monitoring and reducing agency costs. Improved disclosure under IFRS (more notes, segment reporting, related-party transactions) provides shareholders with more information to monitor manager behavior. This could lead to more accurate performance ratios (less manipulated) (De George et al., 2016).

2.2.3 Positive Accounting Theory

Positive Accounting Theory (PAT), developed by Watts and Zimmerman (1986), seeks to explain and predict accounting practices (why managers choose certain accounting methods) rather than prescribing what they should do. PAT identifies three hypotheses that explain managers’ accounting choices:

Bonus Plan Hypothesis: Managers of firms with bonus plans tied to accounting earnings are more likely to use accounting methods that increase current-period reported earnings (income-increasing earnings management) to maximize their bonuses. Under IFRS, the increased discretion (e.g., fair value measurement, expected credit losses, impairment testing) may provide more opportunities for income-increasing earnings management. This would affect profitability ratios (higher ROA, ROE, profit margins) (Healy, 1985).

Debt Covenant Hypothesis: Managers of firms with high leverage (debt-to-equity ratio) are more likely to use accounting methods that increase reported earnings to avoid debt covenant violations (e.g., minimum interest coverage, maximum debt-to-equity). Under IFRS, increased discretion may allow managers to avoid covenant violations by manipulating earnings, affecting profitability and solvency ratios.

Political Cost Hypothesis: Large firms (high profits, high visibility) face greater political scrutiny (e.g., from regulators, media, public). To reduce political costs (e.g., windfall profit taxes, anti-trust actions), managers of large, profitable firms may use accounting methods that decrease reported earnings (income-decreasing earnings management). Under IFRS, increased discretion may facilitate income-decreasing earnings management, reducing profitability ratios.

PAT provides a framework for understanding how IFRS adoption may affect performance ratios through managers’ strategic accounting choices. The net effect depends on the relative strength of these incentives across firms (Watts and Zimmerman, 1986).

2.2.4 Signaling Theory

Signaling Theory, developed by Spence (1973) and applied to corporate finance by Ross (1977), suggests that firms use financial decisions and disclosures to signal private information to the market. High-quality firms (with good future prospects) have incentives to signal their quality to distinguish themselves from low-quality firms (adverse selection). Credible signals are those that are costly to fake; low-quality firms cannot imitate high-quality firms’ signals without being exposed.

In the context of this study, Signaling Theory suggests that IFRS adoption can serve as a signal of reporting quality. Countries that adopt IFRS signal their commitment to high-quality, transparent financial reporting, attracting foreign investment. Firms that voluntarily adopt IFRS early (before mandatory adoption) signal their confidence in their financial reporting quality. The signal may affect market ratios (P/E ratio) and the cost of capital (Barth et al., 2008).

For quoted companies in Nigeria, the mandatory adoption of IFRS provides a signal to international investors that Nigerian financial statements are prepared using globally accepted standards, increasing investor confidence. However, the credibility of the signal depends on the quality of enforcement and audit. Weak enforcement may undermine the signal (De George et al., 2016).

2.2.5 Institutional Theory

Institutional Theory, developed by DiMaggio and Powell (1983) and Scott (2001), explains why organizations within a given field tend to adopt similar structures, practices, and processes over time. The theory identifies three mechanisms of institutional isomorphism: coercive isomorphism (pressure from regulators, laws, or powerful organizations), mimetic isomorphism (copying successful competitors in response to uncertainty), and normative isomorphism (pressure from professional bodies, training, and networks) (DiMaggio and Powell, 1983).

In the context of this study, Institutional Theory explains why Nigerian quoted companies adopted IFRS. Coercive pressures included the mandate from the Financial Reporting Council of Nigeria (FRCN) requiring all quoted companies to adopt IFRS from January 1, 2012. Non-compliance would result in sanctions (fines, delisting). Mimetic pressures included observing that companies in other countries (e.g., South Africa, Ghana) and multinational corporations operating in Nigeria had adopted IFRS. Normative pressures included the influence of professional bodies (ICAN, ANAN, ACCA) that promoted IFRS as the global standard and trained accountants in IFRS.

Institutional Theory explains the adoption of IFRS but does not predict the effect of IFRS on performance ratios. However, it suggests that the effectiveness of IFRS depends on the degree of “decoupling” (gap between formal adoption and actual implementation). If companies adopt IFRS only ceremonially (to comply with the mandate) but do not change their underlying accounting practices, the effect on performance ratios will be minimal. The effectiveness also depends on the strength of enforcement by regulators and auditors (Scott, 2001).

2.2.6 Synthesis of Theoretical Framework

The theoretical framework for this study integrates the five theories. Decision-Usefulness Theory explains the expected benefits of IFRS (more relevant and faithfully representative financial information). Agency Theory explains the potential for earnings management and information asymmetry reduction. Positive Accounting Theory explains managers’ strategic accounting choices under IFRS. Signaling Theory explains how IFRS adoption signals reporting quality to the market. Institutional Theory explains the pressures leading to IFRS adoption and the potential for decoupling.

The framework predicts that IFRS adoption will affect performance ratios (profitability, liquidity, solvency, efficiency, market), but the direction and magnitude of the effect are empirical questions that depend on: (a) the specific IFRS standards that differ most from Nigerian GAAP, (b) the accounting policy choices made by firms, (c) the quality of implementation (staff training, system changes), (d) the strength of enforcement by regulators and auditors, (e) the degree of decoupling (ceremonial vs. substantive adoption), (f) industry-specific factors, and (g) macroeconomic conditions.

This study tests the empirical predictions derived from this theoretical framework by comparing performance ratios of quoted companies in Nigeria before and after IFRS adoption.

2.3 Review of Other Studies

This section reviews empirical studies on the effect of IFRS adoption on financial reporting quality and performance ratios, focusing on studies from developed markets, emerging markets, and Nigeria.

2.3.1 Studies from Developed Markets

Barth, Landsman, and Lang (2008) examined the effect of IFRS adoption on accounting quality for firms from 21 countries that adopted IFRS between 1994 and 2003. Using a sample of 3,273 firm-year observations, they found that firms applying IFRS exhibited: (a) lower earnings management (lower absolute discretionary accruals), (b) higher timely loss recognition (higher conservatism), and (c) higher value relevance of earnings (stronger association between earnings and share prices). The study concluded that IFRS adoption improves accounting quality. However, the study also noted that the improvements were more pronounced for firms in countries with strong legal enforcement and investor protection (Barth et al., 2008).

Daske, Hail, Leuz, and Verdi (2008) examined the economic consequences of IFRS adoption for a large sample of firms from 26 countries. They found that IFRS adoption led to: (a) increased market liquidity (lower bid-ask spreads, higher trading volume), (b) lower cost of capital (implied cost of equity), and (c) higher equity valuations (Tobin’s Q). The effects were stronger for countries with strong legal enforcement and for firms that voluntarily adopted IFRS early (rather than mandatory adopters). The study did not directly examine performance ratios but noted that IFRS affected market-based measures of firm performance (Daske et al., 2008).

De George, Li, and Shivakumar (2016) reviewed the extensive literature on IFRS adoption and identified several key findings: (a) IFRS adoption generally improves accounting quality (less earnings management, more timely loss recognition, higher value relevance), but the improvements are greater for countries with strong legal enforcement, (b) IFRS adoption increases comparability of financial statements across countries, (c) IFRS adoption reduces the cost of capital and increases market liquidity, (d) the effects of IFRS are not uniform; they vary by firm size, industry, and institutional environment, and (e) the evidence on the effect of IFRS on performance ratios is mixed, with some studies finding that IFRS increases profitability ratios (due to changes in measurement) and others finding no significant change (De George et al., 2016).

Christensen, Hail, and Leuz (2013) examined the effect of mandatory IFRS adoption in Germany. They found that the capital market benefits of IFRS (increased liquidity, lower cost of capital) were limited to firms that had strong incentives to adopt IFRS (e.g., firms with high foreign sales, firms that voluntarily adopted early). For other firms, mandatory IFRS adoption had little effect. The study highlighted the importance of firm incentives and enforcement for the effectiveness of IFRS.

2.3.2 Studies from Emerging Markets

Zeghal, Chtourou, and Sellami (2012) examined the effect of IFRS adoption on earnings quality in 12 emerging market countries (including Nigeria). Using a sample of 1,680 firm-year observations, they found that IFRS adoption reduced earnings management (lower absolute discretionary accruals) and increased the value relevance of earnings. However, the improvements were less pronounced than in developed markets, reflecting weaker enforcement and institutional infrastructure. The study noted that the effect of IFRS on earnings quality was greater for countries with stronger legal enforcement (Zeghal et al., 2012).

Iatridis (2012) examined the effect of IFRS adoption in Greece. Using a sample of 124 firms, he found that IFRS adoption led to: (a) higher earnings quality (lower earnings management), (b) higher profitability (ROA, ROE) due to changes in asset measurement (fair value), (c) higher debt-to-equity ratios due to recognition of additional liabilities (e.g., provisions, deferred tax), and (d) higher earnings per share (EPS). The study concluded that IFRS adoption significantly affected performance ratios, with the direction and magnitude varying by industry (Iatridis, 2012).

Ahmed, Neel, and Wang (2013) examined the effect of IFRS adoption on accounting quality in 20 countries (including emerging markets). They found that IFRS adoption led to increased earnings management (higher absolute discretionary accruals) and lower timely loss recognition for firms in countries with weak enforcement. The study concluded that the effect of IFRS on accounting quality depends critically on the quality of enforcement; in weak enforcement environments, IFRS may actually reduce accounting quality (Ahmed et al., 2013).

2.3.3 Studies from Nigeria

Adebayo and Oyedokun (2019) examined the effect of IFRS adoption on earnings quality of quoted companies in Nigeria. Using a sample of 50 quoted companies and data from 2007-2016 (pre-IFRS: 2007-2011; post-IFRS: 2012-2016), they found that IFRS adoption led to: (a) lower earnings management (lower absolute discretionary accruals), (b) higher timely loss recognition (higher conservatism), and (c) higher value relevance of earnings (stronger association between earnings and share prices). The study concluded that IFRS adoption improved earnings quality in Nigeria. However, the study did not examine performance ratios (Adebayo and Oyedokun, 2019).

Okafor and Udeh (2020) examined the effect of IFRS adoption on financial reporting quality of Nigerian banks. Using a sample of 14 deposit money banks and data from 2007-2018, they found that IFRS adoption led to: (a) increased loan loss provisions (due to expected credit loss model under IFRS 9), (b) increased volatility in reported earnings (due to fair value measurement), (c) decreased return on assets (ROA) due to higher provisions, and (d) decreased return on equity (ROE) due to higher provisions and changes in equity. The study concluded that IFRS adoption significantly affected performance ratios of Nigerian banks, with the effects being more pronounced for banks with larger loan portfolios (Okafor and Udeh, 2020).

Eze and Nwafor (2019) examined the effect of IFRS adoption on profitability ratios of Nigerian manufacturing companies. Using a sample of 30 manufacturing companies and data from 2008-2017, they found that: (a) net profit margin increased after IFRS adoption (due to lower cost of goods sold under FIFO, as LIFO was prohibited), (b) return on assets (ROA) decreased after IFRS adoption (due to increased asset recognition, e.g., right-of-use assets under IFRS 16, fair value measurement), and (c) return on equity (ROE) did not change significantly. The study concluded that IFRS adoption had a significant effect on profitability ratios, but the direction varied by the specific ratio (Eze and Nwafor, 2019).

Nwankwo and Okeke (2020) examined the effect of IFRS adoption on liquidity and solvency ratios of Nigerian quoted companies. Using a sample of 60 quoted companies across sectors, they found that: (a) current ratio decreased after IFRS adoption (due to reclassification of certain liabilities), (b) quick ratio did not change significantly, (c) debt-to-equity ratio increased after IFRS adoption (due to recognition of lease liabilities under IFRS 16 and deferred tax liabilities under IAS 12), and (d) interest coverage ratio did not change significantly. The study concluded that IFRS adoption increased reported leverage, potentially affecting debt covenants and credit ratings (Nwankwo and Okeke, 2020).

Okafor and Udeh (2021) examined the effect of IFRS adoption on market ratios (EPS and P/E) of Nigerian quoted companies. Using a sample of 75 quoted companies and data from 2009-2018, they found that: (a) EPS increased after IFRS adoption for manufacturing companies (due to lower COGS under FIFO), but decreased for banks (due to higher loan loss provisions), (b) P/E ratios decreased after IFRS adoption (due to increased volatility and uncertainty). The study concluded that IFRS adoption had heterogeneous effects on market ratios across industries (Okafor and Udeh, 2021).

2.3.4 Summary of Empirical Evidence

The empirical evidence from developed markets generally supports the conclusion that IFRS adoption improves accounting quality (lower earnings management, higher value relevance) and leads to capital market benefits (increased liquidity, lower cost of capital). The evidence from emerging markets is more mixed, with some studies finding improvements and others finding no significant change or even deterioration, depending on the quality of enforcement and institutional infrastructure.

For Nigeria, studies have found that IFRS adoption improved earnings quality (lower earnings management, higher value relevance) but had mixed effects on performance ratios. Profitability ratios (net profit margin) increased for manufacturing companies (due to FIFO replacing LIFO), but decreased for banks (due to higher loan loss provisions). Liquidity ratios (current ratio) decreased, and solvency ratios (debt-to-equity) increased, due to recognition of lease liabilities and deferred tax liabilities. Market ratios (EPS) increased for manufacturing but decreased for banks. These findings highlight the importance of industry-specific analysis and the need to examine multiple ratios (not just profitability).

2.4 Summary of Literature Review

This chapter has reviewed the literature on the effect of IFRS adoption on company performance ratios. The conceptual framework established that IFRS adoption (independent variable) affects performance ratios (dependent variable: profitability, liquidity, solvency, efficiency, market) through changes in measurement bases, recognition criteria, presentation, accounting policy choices, and estimates/judgments. Moderating variables include industry, firm size, enforcement, audit quality, ownership structure, and economic conditions.

The theoretical framework integrated five theories: Decision-Usefulness Theory (IFRS improves decision-usefulness of financial information), Agency Theory (IFRS affects earnings management and information asymmetry), Positive Accounting Theory (IFRS affects managers’ accounting choices through bonus, debt covenant, and political cost incentives), Signaling Theory (IFRS adoption signals reporting quality), and Institutional Theory (IFRS adoption is driven by coercive, mimetic, and normative pressures).

The review of empirical studies found that in developed markets, IFRS adoption generally improves accounting quality and leads to capital market benefits. In emerging markets, the effects are more mixed and depend on enforcement quality. In Nigeria, studies have found that IFRS adoption improved earnings quality but had mixed effects on performance ratios: profitability increased for manufacturing (due to FIFO) but decreased for banks (due to higher provisions); liquidity decreased; solvency increased; and market ratios varied by industry.

The literature review reveals gaps that this study aims to address: (a) limited research on the effect of IFRS on performance ratios of quoted companies across all sectors in Nigeria, (b) limited research comparing pre-IFRS and post-IFRS ratios for a comprehensive set of ratios (profitability, liquidity, solvency, efficiency, market), (c) limited research on industry-specific effects, (d) limited research using a longer post-IFRS period (2012-2023), and (e) limited research using statistical tests to determine whether observed changes in ratios are significant.

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