CHAPTER ONE

INTRODUCTION

1.1 Background of the study

Overtime, auditing plays a crucial role in ensuring the credibility of financial statements, particularly in today’s business environment, where transparency and accountability are paramount. Auditing has a long history that dates back to ancient civilizations, particularly in Egypt and Greece, where record keepers and overseers were assigned to check financial accounts and where auditing was used to ensure accountability in managing public funds. However, the modern concept of auditing began to take shape during the Industrial Revolution in the 19th century, when businesses expanded and required independent verification on financial transactions and information to protect investors and stakeholders. This led to the emergence of professional auditors and the establishment of auditing as a formal discipline. By the 20th century, the audit profession had become more structured with the formation of global bodies such as the International Federation of Accountants (IFAC) and the International Auditing and Assurance Standards Board (IAASB), which helped to develop global auditing standards. With advances in technology and globalization, the scope of auditing has expanded beyond financial records to include operational audits, compliance audits, and information technology audits. Modern auditing is now expected to address issues such as cybersecurity threats, environmental and social governance (ESG) compliance, data integrity, and the timely detection of financial irregularities. In all these areas, audit quality remains the foundation upon which the credibility of financial reporting and corporate governance is built. Audit quality is the backbone of financial reporting and corporate governance, ensuring that financial statements present a true and fair view of a company`s performance. (Okoye et al., 2022)

In Nigeria, as in many developing economies, the quality of auditing is crucial for maintaining investor confidence, ensuring regulatory compliance, and facilitating the smooth functioning of capital markets. One key factor influencing audit quality is the size of the audit firm. Globally, the "Big Four" audit firms(KPMG, PwC, Deloitte, and Ernst & Young (EY) are often

regarded as industry leaders due to their broader expertise, global networks, strict quality control systems, and adherence to international standards. These large firms typically invest heavily in auditor training, advanced technology, and comprehensive audit methodologies, enabling them to deliver high-quality audit services across different sectors and jurisdictions. In contrast, smaller audit firms, while playing a significant role in the Nigerian audit landscape may lack the same level of technical capacity or exposure to global best practices and may be more susceptible to client pressure, potentially compromising audit independence and effectiveness. This disparity has led to concerns regarding the comparative audit quality delivered by smaller firms as compared to larger ones. It is often assumed that larger firms produce more reliable audit reports, while smaller firms may struggle to maintain independence or to detect complex financial irregularities. This perception influences how stakeholders interpret audit reports and can shape investment decisions, regulatory actions, and public trust in financial disclosures.

The manufacturing sector in Nigeria is a major contributor to the country’s GDP and employment. However, the sector faces several financial and operational challenges such as inadequate infrastructure, policy inconsistency, foreign exchange constraints, and fluctuating consumer demand, making the reliability of its financial reporting even more critical. Stakeholders in the manufacturing sector must be confident that financial statements are accurate and reflect the true state of an enterprise’s financial health. Despite efforts by Nigerian regulatory bodies such as the Financial Reporting Council of Nigeria (FRCN), the Institute of Chartered Accountants of Nigeria (ICAN), and the Securities and Exchange Commission (SEC) to promote high audit standards and improve auditor accountability, gaps in audit quality still exist. These gaps are especially critical in sectors like manufacturing, where financial transparency is essential for attracting investment, securing credit, and driving long-term industrial growth.

This study aims to determine whether larger audit firms indeed provide superior audit quality and to what extent audit firm size influences stakeholder confidence and regulatory compliance. By understanding this relationship, the research hopes to contribute to ongoing

discussions on audit reforms and the need for stronger regulatory frameworks that promote high audit standards, regardless of firm size.

1.2 Statement of the problem

The credibility of financial reporting is a critical determinant of investor confidence, regulatory trust, and sustainable economic growth. In Nigeria’s manufacturing sector, this issue is particularly important given the sector’s contribution to GDP, employment, and industrialization. However, the sector has faced persistent financial irregularities, weak disclosure practices, and concerns over the quality of audits. Stakeholders increasingly question whether the size of the audit firm materially affects the reliability of audit outcomes.

Globally, the “Big Four” audit firms (Deloitte, PwC, KPMG, and Ernst & Young) are often associated with higher audit quality due to their resources, technical expertise, and global reputations. In contrast, smaller audit firms are sometimes perceived to face resource constraints and client pressure, potentially raising concerns about the credibility of the reports they issue. In Nigeria, this perception is magnified in the manufacturing sector where financial reporting challenges are compounded by policy inconsistency, foreign exchange volatility, and high operational costs.While several studies have linked audit firm size to audit quality, much of the existing research in Nigeria has focused on financial institutions or general listed companies, with limited emphasis on the manufacturing sector. Even fewer studies have examined how audit firm size influences not only audit quality but also the overall credibility and reliability of financial reporting. This gap makes it difficult for regulators, investors, and corporate boards to fully understand whether engaging larger audit firms translates into more trustworthy financial disclosures in Nigeria’s manufacturing industry.

This study seeks to bridge that gap by investigating whether audit firm size significantly impacts audit quality and whether it influences the credibility of financial reporting in the Nigerian manufacturing sector.

1.3 Research Questions

Based on the problem identified, this study seeks to answer the following research questions:

1. What is the impact of audit firm size on audit quality in the Nigerian manufacturing industry?

2. How does audit firm size influence the credibility and reliability of financial reporting among Nigerian manufacturing firms?

1.4 Objective of the study

The specific objectives of this study are:

1. To examine the impact of audit firm size on audit quality in the Nigerian manufacturing industry.

2. To assess how audit firm size influences the credibility and reliability of financial reporting among Nigerian manufacturing firms.

1.5 Research Hypothesis

Null Hypothesis (H₀): Audit firm size has no significant impact on audit quality in the Nigerian manufacturing industry.

Alternative Hypothesis (H₁): Audit firm size has a significant impact on audit quality in the Nigerian manufacturing industry.

1.6 Significance of the study

This study examines how the size of audit firms affects the quality of audits in Nigeria’s manufacturing industry. This research is significant in several ways.

For Regulators and Policymakers, the findings will provide evidence on whether audit firm size materially influences audit outcomes, thereby guiding reforms in audit regulation and corporate governance.

For Manufacturing companies, the study will inform decisions on auditor selection by highlighting whether larger audit firms indeed deliver more credible and reliable audits.

For Investors and Financial Analysts, the study strengthens the basis for trusting audited financial statements, ultimately improving investment confidence in the manufacturing sector.

For Audit Firms, the study provides insight into how size and resources impact client perceptions and market competitiveness. Smaller firms may identify areas for improvement, while larger firms may use the findings to reinforce their reputational value.

Finally, this study contributes to academic literature by filling a contextual gap in Nigeria’s manufacturing industry, serving as a reference point for future research.

1.7 Scope of the study

This study is focused exclusively on the Nigerian manufacturing sector, which is a vital contributor to the country’s economy but faces significant operational and financial reporting challenges. It examines both large and small audit firms that provide services to listed manufacturing firms in Nigeria. The analysis covers how audit firm size influences two dimensions: audit quality and credibility of financial reporting. Other audit-related issues such as compliance with auditing standards or auditor independence are outside the scope of this study, as the research is deliberately streamlined to focus on the direct relationship between firm size and the reliability of audited financial statements.

1.8 Definition of Key Terms

1. Audit Firm Size

Refers to the scale and capacity of an audit firm, usually determined by factors such as the number of clients, revenue base, staff strength, and international affiliation.

2. Audit Quality

Represents the degree to which an audit increases the reliability of financial statements. A high-quality audit is one in which the auditor both detects and reports material misstatements.

3. Credibility of Financial Reporting

Refers to the extent to which financial statements are considered reliable, accurate, and timely by stakeholders such as investors, regulators, and creditors.

4. Firm Size (Client Size)

Refers to the overall scale of a company’s operations.

5. Profitability

Indicates the financial performance of a company.

6. Leverage

Represents the financial risk of a company by showing the proportion of debt in its capital structure.