The Impact of Internal Audit On Fraud Detection And Prevention ( A Case Study Of Power Holding Company of Nigeria)

CHAPTER ONE

1.1 Background to the Study

Fraud has remained a persistent challenge in modern business environments. It is not a new occurrence, yet its effects on organizations continue to grow in scale and complexity. According to the Association of Certified Fraud Examiners (ACFE, 2022) and PricewaterhouseCoopers (PwC, 2020), corporate fraud costs businesses billions of dollars each year. Their findings show that no sector is completely immune. While larger corporations experience a higher number of fraud incidents, smaller firms suffer greater proportional losses.

Recent global surveys revealed that approximately 47 percent of organizations had encountered economic crimes or fraudulent activities within a two-year period (PwC, 2020). The average financial loss per company was estimated at over 2.4 million United States dollars. Likewise, the ACFE (2022) found that about five percent of corporate revenue is lost annually to fraud worldwide. When these figures are applied to national economies, the result is staggering.

Although fraud detection often relies on chance and whistleblowing, internal audit functions play a critical role in exposing and mitigating such acts. Effective internal audit systems enhance accountability, ensure adherence to control procedures, and help uncover irregularities early (Owolabi & Dada, 2020). Moreover, organizations that invest in strong control frameworks tend to experience lower rates of internal fraud.

In developing economies like Nigeria, the problem is even more pronounced. Many public and private institutions, despite significant investments in audit units, still struggle with financial misconduct and corruption (Okafor & Uche, 2021). Researchers have also explored technological innovations such as artificial intelligence and data mining to improve fraud detection (Bierstaker et al., 2021). Even so, the need for preventive strategies remains equally important. For this reason, internal audit should be viewed not merely as a detection mechanism but also as a preventive and corrective process that safeguards public trust.

This study therefore examines how internal audit contributes to fraud detection and prevention in the Power Holding Company of Nigeria (PHCN), highlighting its role in strengthening accountability and transparency within the public sector.

1.2 Statement of the Problem

The rising incidence of fraud poses serious challenges to both private and public sector organizations. In recent years, there has been a notable increase in the frequency and value of fraudulent activities across Nigeria (Aderibigbe, 2021). Many organizations now face growing internal pressures that encourage unethical behavior.

Economic hardship and unemployment have made employees more vulnerable to engaging in fraudulent acts. Additionally, layoffs and budget cuts have weakened internal control systems. Studies reveal that when organizations reduce staff strength, control measures often decline in quality and coverage (Ogunleye, 2020). In public enterprises such as PHCN, this creates opportunities for embezzlement, financial misreporting, and other irregularities.

Furthermore, inadequate training, limited resources, and lack of independence among internal auditors have reduced the effectiveness of audit functions. Consequently, the central problem addressed in this study is how internal audit mechanisms can be strengthened to detect and prevent fraud within PHCN and similar public sector organizations.

1.3 Objectives of the Study

The main objective of this study is to assess the impact of internal audit on fraud detection and prevention in the Power Holding Company of Nigeria. The specific objectives are to:

1. Identify the key factors that influence the effectiveness of internal audit in detecting fraud.

2. Examine the level of information flow required for efficient auditing operations.

3. Determine whether objective assessment of internal controls can effectively reduce fraud.

4. Evaluate whether a structured internal audit system can influence employees’ attitudes toward fraudulent acts.

1.4 Research Questions

1. Can internal audit assessments of control effectiveness reduce or prevent fraud?

2. Does a well-organized internal audit system influence employee attitudes toward fraud?

3. What human-related factors affect the performance of internal auditors?

4. Why are some client transactions not verified for accuracy and completeness?

1.5 Research Hypotheses

Hypothesis One

• H₀: There is no significant relationship between an effective internal audit system and the occurrence of fraud in the public sector.

• H₁: There is a significant relationship between an effective internal audit system and the occurrence of fraud in the public sector.

Hypothesis Two

• H₀: An effective internal check does not make fraudulent practices and irregularities difficult to perpetrate in the public sector.

• H₁: An effective internal check makes fraudulent practices and irregularities difficult to perpetrate in the public sector.

1.6 Significance of the Study

This research contributes to a deeper understanding of how internal audit can serve as both a preventive and corrective tool in managing fraud. It highlights practical ways organizations can safeguard assets, strengthen internal controls, and promote financial accountability.

The study is particularly useful to management teams, policymakers, auditors, and students of accounting and public administration. For instance, management can apply the findings to develop procedures for monitoring cash receipts, verifying transactions, and reconciling bank statements. It also provides guidance on maintaining inventory records and improving procurement oversight.

Moreover, policymakers may find the results valuable in designing regulations that support audit independence and transparency. Overall, this study adds to the growing body of knowledge on corporate governance and accountability in the Nigerian public sector.

1.7 Scope of the Study

The scope of this study covers the internal audit system of the Power Holding Company of Nigeria (PHCN). It examines how internal auditing can be structured to effectively detect and prevent fraud. The key areas of focus include:

1. Quality control in auditing

2. Internal control procedures

3. Investigative auditing

4. Statutory audit functions

5. Legal frameworks governing audit practice in Nigeria

1.8 Limitations of the Study

Certain challenges were encountered during the course of this research. The major constraints include:

1. Time limitation: Balancing academic responsibilities with research activities limited the available time for data collection.

2. Financial constraint: Limited financial resources affected the researcher’s ability to gather extensive primary data.

3. Electricity supply: Frequent power outages interrupted research progress.

4. Respondent attitude: Some PHCN employees were reluctant to provide detailed information.

Despite these challenges, the study was completed successfully through persistence and the use of credible secondary data.

1.9 Definition of Terms

Audit Risk: The likelihood that the auditor may fail to detect material misstatements during the audit process.

Audit Procedure: The sequence of techniques and methods used by an auditor to perform an audit.

Internal Audit Committee: A group responsible for overseeing audit operations within an organization, often including senior management and audit officers.

Audit Manual: A document that outlines the objectives, procedures, and standards of internal auditing.

Working Paper: Records maintained by auditors as evidence of audit work carried out.

Audit Scope: The extent of activities and processes covered during an audit examination.

Audit Time Frame: The specific period during which an internal audit exercise is expected to take place.

1.10 Historical Background of the Power Holding Company of Nigeria (PHCN)

Electricity generation in Nigeria began in 1898 with the establishment of the first power plant in Lagos. As demand grew, additional local electricity undertakings were established by native and municipal authorities. The Electricity Corporation of Nigeria (ECN) later became the national body responsible for generating, transmitting, and distributing power across the country.

In 1972, Decree No. 24 merged the ECN and the Niger Dams Authority to form the National Electric Power Authority (NEPA). This merger aimed to improve coordination and efficiency. Eventually, NEPA was restructured and rebranded as the Power Holding Company of Nigeria (PHCN) to prepare for the privatization and unbundling of the power sector.

PHCN played a central role in expanding Nigeria’s power infrastructure, although it continued to face issues such as corruption, technical inefficiency, and weak auditing systems. Understanding how internal audit can mitigate such problems is essential to improving transparency and performance within the organization.