Related Party Transactions in Due Diligence: Identifying Hidden Risks

Related party transactions are among the highest-risk areas in financial due diligence. They distort reported earnings, obscure the target's true cost structure, and create dependencies that may not survive a change of ownership.

In middle-market deals, related party issues appear in the majority of engagements. Owner-operated businesses frequently use related entities for real estate, services, purchasing, or shared overhead. None of this is unusual. What matters is whether these transactions occur at arm's-length terms and whether they will continue post-close.

Why Related Parties Matter for Deal Pricing

Related party transactions affect the purchase price through two mechanisms.

First, they impact normalized EBITDA. If the target pays above-market rent to a related entity, the excess rent inflates costs and depresses EBITDA. If it pays below-market rent, EBITDA is overstated because the true cost of occupancy is not reflected. Both directions require adjustment.

Second, they create operational dependencies. If a related party provides critical services (IT, logistics, raw materials) at non-market terms, the buyer must assess replacement cost and availability. A favorable supply agreement with a related entity that terminates at closing can materially change the target's cost structure.

Common Categories

The most frequently encountered related party transactions in due diligence include:

Real estate leases. The owner or a related entity owns the operating premises and leases them to the target. Terms are rarely at market rates in either direction.

Management fees and services. The parent or holding company charges management fees to the target. These may cover legitimate services or may be a mechanism for extracting cash.

Purchasing and supply agreements. The target buys raw materials, components, or services from related entities. Transfer pricing may not reflect market terms.

Employee arrangements. Family members or related individuals on the payroll at above-market compensation. Personal expenses charged to the business.

Loans and financing. Intercompany loans with non-market interest rates, or related-party guarantees that will not be available post-close.

Detection Approach

Related party transactions are not always disclosed transparently. Effective detection requires multiple approaches:

Financial statement analysis. Review the notes to the financial statements for disclosed related party transactions. But do not rely on disclosure alone. Under-reporting is common, particularly in private companies.

Vendor and customer concentration analysis. Flag vendors and customers with matching addresses, phone numbers, or ownership. Cross-reference with corporate registry data. Customer concentration analysis workflows should include related party screening as a standard step.

GL transaction review. Scan the general ledger for recurring payments to entities with similar names, payments to individuals who are also employees, and transactions with round-dollar amounts that suggest non-market pricing.

Management representations. Require a comprehensive related party disclosure as part of the management representation letter. Compare to the independent analysis to identify gaps.

Corporate structure review. Map the target's legal entity structure and identify common ownership, directors, or officers across entities.

Quantifying the Impact

Once identified, each related party transaction needs to be assessed on two dimensions:

Pricing adjustment. Estimate the difference between the related party price and a fair market equivalent. This adjustment flows directly to the normalized EBITDA calculation.

For real estate, obtain comparable market rents. For services, benchmark against third-party quotes. For supply agreements, compare to publicly available pricing or competitive bids.

Continuity assessment. Determine whether the transaction will continue post-close on current terms, renegotiated terms, or be replaced by a third-party arrangement. The post-close cost structure may differ materially from the historical view.

Adjustment Framework

Related party adjustments typically fall into three buckets:

1. Eliminate and replace. The transaction will not continue post-close. Remove the related party cost and add the estimated replacement cost. Common for management fees and shared services.

2. Adjust to market. The transaction will continue but should be reflected at market terms. Common for real estate leases and supply agreements.

3. Eliminate entirely. The cost has no business substance and will not be replaced. Common for excess owner compensation and personal expenses.

Each adjustment must be clearly documented with supporting evidence for the market comparison. Vague assertions that a lease is "above market" will not withstand challenge from the seller's advisors.

Reporting Considerations

Related party findings should be reported in a dedicated section of the diligence report, not buried within the EBITDA adjustments. This ensures the buyer's deal team, legal counsel, and board can assess the full scope of related party dependencies.

The report should address:

• Complete list of identified related party transactions
• Annual financial impact of each
• Market-rate benchmarking and basis
• Post-close continuity assessment
• Recommended SPA protections (indemnities, transitional service agreements)

For teams handling complex related party webs, having standardized deal workflows ensures consistent identification and documentation across engagements. This is particularly important in private equity due diligence where portfolio company add-ons frequently involve related party structures that must be unwound.