How long does due diligence take when selling a business?

Due diligence is the confirmatory phase that sits after a signed letter of intent and before closing. The buyer has agreed on price in principle; now they verify that what you represented is real. For a small, clean deal it can wrap in a couple of months, while a larger or more complex business - especially one being bought by a private-equity firm - runs toward the longer end. Across the whole arc, expect the full sale process to take 6-12 months, with diligence and closing accounting for the back half.

Diligence runs on three main tracks. Financial review centers on a quality-of-earnings (QoE) analysis that tests whether your adjusted EBITDA is real, recurring, and accurately stated - the figure the purchase price is a multiple of. Legal review covers contracts, leases, licenses, corporate records, and any litigation. Operational and commercial review looks at customer concentration, key employees, systems, and growth assumptions, plus tax and (where relevant) environmental items. Private-equity buyers take the longer end precisely because all three tracks are thorough.

What stretches the timeline is almost always preparation gaps: cash-basis or messy books, missing or unsigned contracts, undocumented add-backs, or a customer-concentration surprise that triggers a re-trade. What compresses it is the opposite - 2-3 years of clean accrual financials, defensible add-backs, an organized virtual data room ready before buyers ask, and reduced owner dependence. Some owners commission a sell-side QoE before going to market so problems surface early instead of mid-deal.

Starting from a pre-qualified, capitalized buyer rather than an open marketing process also removes weeks of back-and-forth, because the buyer is serious and ready to move. DealSeam is not a traditional business broker; where there's a fit, it introduces owners to qualified buyers, while your own advisors and the buyer's diligence team handle the actual review.