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Basics

Due diligence

Also known as: DD, M&A due diligence, acquisition due diligence

Definition

Due diligence is the investigation a buyer carries out on a target business before completing a purchase. It verifies what the seller has represented and identifies risks that could change the price or the terms of the deal.

Updated November 2026

Due diligence, explained simply

Due diligence tests the seller’s information against source evidence across finance, tax, legal, commercial, operational, IT and HR. It normally begins once a letter of intent is signed and ends when the purchase agreement is executed.

Findings feed directly into the price, the working capital target, the protections in the purchase agreement and the conditions to closing.

Where due diligence sits in a transaction

Illustrative

Typical sequence of a private company acquisition

Diligence runs between the letter of intent and signing, typically 30 to 90 days for a mid-sized private company.

Principal workstreams

WorkstreamQuestion it answers
FinancialAre reported earnings sustainable, and what is the net debt and working capital position?
TaxAre there unpaid or contingent tax liabilities?
LegalAre contracts, licenses and ownership in order, and what rights transfer on a change of control?
CommercialIs the market healthy, and will customers remain?
OperationalCan the business operate as presented after the sale?
IT and cyberAre systems and data adequately controlled?
HRWill key people stay, and are employees correctly classified and paid?

Worked example

A private equity sponsor agrees to acquire Alder Creek Manufacturing for $40.0 million, being 8.0x reported EBITDA of $5.0 million. Diligence finds that only $4.6 million of EBITDA is recurring, and that the largest customer may terminate its contract on a change of ownership.

At 8.0x, $4.6 million of EBITDA supports a price of $36.8 million. The sponsor reduces its offer by $3.2 million and makes renewal of the customer contract a condition to closing.

Alder Creek Manufacturing, Inc. is a fictional company. All figures are illustrative.

Why it matters in a deal

Buyers price on a multiple of earnings, so any error in earnings is multiplied in price. Diligence findings also drive the purchase agreement: the price, the indemnities and the conditions to closing.

Red flags

  • Slow or incomplete responses to information requests
  • Figures that do not reconcile between documents
  • Dependence on a single customer, supplier or individual
  • Unexplained changes in results in the months before the sale

Frequently asked questions

What is due diligence in M&A?
Due diligence is the investigation a buyer carries out on a target business before completing a purchase. It verifies what the seller has represented and identifies risks that could change the price or the terms of the deal.
How long does due diligence take?
For a mid-sized private company, commonly 30 to 90 days, depending on scope, complexity and the seller’s responsiveness.
Who performs it?
The buyer’s deal team, supported by advisors for financial, tax, legal and other workstreams.
Does due diligence eliminate risk?
No. It reduces uncertainty and gives the buyer the evidence to negotiate price and protections.

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