What Are the Hidden Costs in M&A Deals?

Advisor fees get most of the attention. But the total cost of selling a business includes several other line items owners forget until the wire hits.

Legal fees

Expect $75K–$300K for a mid-market deal, depending on complexity. Purchase agreements, disclosure schedules, employment agreements, and closing documents all take real attorney hours.

Quality of earnings

Buyers increasingly require a sell-side QoE report from a CPA firm. Budget $25K–$75K. It's not optional if you want to preserve deal value through diligence.

Tax planning

Structure matters — asset sale vs. stock sale, allocation of purchase price, F-reorganizations. Real tax advice up front, before the LOI, can shift six or seven figures.

Reps and warranties insurance

Increasingly common in deals over $10M. Premiums typically run 2.5%–4% of coverage. Sometimes the buyer pays, sometimes it's split.

Post-close obligations

• Escrow holdbacks: typically 5%–15% of purchase price held 12–24 months
• Working capital true-up: often a positive or negative adjustment after closing
• Earnouts: contingent payments that may or may not materialize
• Transition services and non-competes: real time commitments post-close

Rule of thumb

Between all-in transaction costs and post-close obligations, plan on 8%–12% of enterprise value coming out of the top-line number before it's yours. Working through this early prevents ugly surprises at closing.