Related party transactions (RPTs) are an area of high risk and scrutiny in the field of financial reporting. These transactions occur between entities or individuals with pre-existing relationships, such as subsidiaries, associates, directors, shareholders, or family members of key executives. While many RPTs are legitimate and can be conducted at arm’s length, they also create opportunities for manipulation, concealment of liabilities, or misstatement of revenues. For this reason, auditors place particular emphasis on evaluating related party arrangements to ensure transparency, compliance with accounting standards, and protection of stakeholder interests.

The Big Four audit firms—Deloitte, PwC, EY, and KPMG—play a leading role in auditing RPTs for multinational corporations and listed entities worldwide. Their methodologies, resources, and global reach allow them to identify and assess risks tied to related party transactions, especially in industries where complex corporate structures and cross-border operations make these relationships more opaque. Given the potential for abuse, regulators such as the International Auditing and Assurance Standards Board (IAASB), the Public Company Accounting Oversight Board (PCAOB), and national securities commissions have consistently emphasized auditors’ duties in this area.

Within this context, the big 4 consulting companies have developed rigorous approaches to related party audits. Their processes extend beyond reviewing management’s disclosures; they involve a deep dive into board minutes, contracts, shareholder agreements, and unusual journal entries that may hint at undisclosed relationships. The Big Four are expected not only to verify the completeness of disclosures but also to challenge management’s assertions where risks of conflict of interest or self-dealing are present.

Importance of Related Party Transactions Audit

RPTs can have a direct effect on the fairness of financial statements. For example, a company might sell assets to a related entity at inflated prices to artificially boost revenues or shift liabilities to an affiliated entity to strengthen its balance sheet. When such transactions are concealed or inadequately disclosed, investors and creditors are deprived of an accurate picture of the company’s performance and financial position. High-profile corporate collapses have frequently involved questionable related party dealings, underscoring the importance of robust audit procedures.

The role of auditors is to provide assurance that RPTs are properly identified, authorized, valued, and disclosed. This task requires heightened professional skepticism because management may have incentives to obscure the nature of certain relationships.

Deloitte’s Approach

Deloitte emphasizes the integration of data analytics into its RPT audits. By leveraging advanced tools, Deloitte auditors can examine patterns in payments, journal entries, and intercompany transfers to identify transactions that may not have been fully disclosed. Their approach involves frequent communication with audit committees and directors to ensure governance oversight. Deloitte also conducts training for its professionals to reinforce awareness of fraud risks associated with undisclosed related parties.

PwC’s Approach

PwC highlights transparency and stakeholder communication in its RPT audits. Its methodology involves extensive inquiries with both management and board members to cross-validate disclosures. PwC has developed frameworks to assess whether RPTs align with the company’s strategic interests and whether they were conducted on market terms. PwC also focuses on documenting the rationale for significant related party transactions, recognizing that the “substance over form” principle is critical in evaluating whether a transaction has been structured to mask its true purpose.

EY’s Approach

EY emphasizes governance and ethical standards in RPT auditing. The firm’s teams review not only the financial impact of transactions but also the corporate governance environment in which they are approved. EY’s approach includes evaluating the effectiveness of internal controls over related party identification and disclosure. Furthermore, EY uses forensic audit techniques when red flags appear, such as recurring transactions with entities linked to company executives. By focusing on both compliance and ethics, EY seeks to safeguard reputational integrity alongside financial accuracy.

KPMG’s Approach

KPMG adopts a risk-based approach, tailoring its audit work depending on the complexity and significance of RPTs in a particular client. Its methodology emphasizes proactive engagement with audit committees to address potential conflicts of interest. KPMG auditors also employ network-wide databases to identify undisclosed affiliations, especially in multinational audits where subsidiaries and affiliates operate across different jurisdictions. This global coordination enables KPMG to uncover relationships that may not be evident from local filings alone.

Challenges in Auditing Related Party Transactions

Despite sophisticated methods, the Big Four face notable challenges in auditing RPTs:

• Complex Structures: Conglomerates with hundreds of subsidiaries may intentionally or unintentionally obscure related party ties.

• Management Resistance: Executives may be reluctant to disclose sensitive transactions, especially those involving family members or private entities.

• Cross-Border Issues: Varying disclosure requirements across jurisdictions can complicate audits for multinational clients.

• Fraud Risk: Related party dealings have been at the center of several fraud cases, making auditors’ responsibilities even more critical.

Evolving Standards and Regulatory Pressure

Auditing standards now require greater rigor in identifying and evaluating RPTs. ISA 550 (Related Parties) and PCAOB AS 2410 set clear expectations for auditors to go beyond management’s disclosures and perform independent procedures. The Big Four firms have responded by investing in technology, forensic teams, and enhanced training programs to meet these expectations. Regulators, meanwhile, continue to scrutinize audit performance in this area, especially after corporate failures linked to undisclosed related parties.

Related party transactions, while common in business, pose significant risks when they are not transparent or when they are structured to mislead stakeholders. Deloitte, PwC, EY, and KPMG have developed robust methodologies to audit such transactions, leveraging data analytics, governance reviews, and global coordination to uncover hidden risks. However, challenges such as complex corporate structures and potential management resistance mean that professional skepticism remains vital.

As capital markets demand greater transparency and regulators tighten oversight, the ability of the Big Four audit firms to effectively audit RPTs will remain central to investor confidence. Their work in this area not only ensures compliance with accounting standards but also upholds the integrity of financial reporting and protects stakeholders from the consequences of concealed conflicts of interest.

Related Resources:

Substantive Testing Procedures at Leading Big Four Audit Firms
Big Four Audit Firms: Going Concern Assessment and Evaluation