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Basics

Confirmatory diligence

Also known as: confirmatory due diligence, confirmatory review, bring-down diligence

Definition

Confirmatory diligence is a shorter, focused review that tests and updates information already provided, typically a sell-side quality of earnings report, rather than investigating the business from the beginning.

Updated November 2026

Confirmatory diligence, explained simply

Where a seller has delivered a thorough and recent report, the buyer need not repeat all of it. The buyer’s team tests the largest adjustments against source documents, rolls the numbers forward for recent months and checks anything that has changed.

It is also used as a bring-down review shortly before signing or closing, and by lenders confirming key figures before funding.

Confirmatory review outcomes

Illustrative

Items are confirmed, adjusted or remain open pending evidence.

Worked example

Alder Creek’s sell-side QoE shows adjusted EBITDA of $4.6 million for the twelve months to June. Over two to three weeks the buyer’s team tests the five largest adjustments against source documents, re-performs proof of cash for selected months, rolls results forward to September (LTM EBITDA $4.7 million) and reviews working capital.

One adjustment worth $0.1 million cannot be supported and is removed. The agreed figure remains $4.6 million.

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

Why it matters in a deal

It saves time and cost while preserving the buyer’s protection. The scope depends on the quality of the seller’s report and the size of the risk.

Red flags

  • Recent months that depart from the historical trend
  • Adjustments the seller cannot document
  • A sell-side report prepared on an outdated period

Frequently asked questions

What is confirmatory diligence in M&A?
Confirmatory diligence is a shorter, focused review that tests and updates information already provided, typically a sell-side quality of earnings report, rather than investigating the business from the beginning.
Is confirmatory diligence enough on its own?
It is where the sell-side work is thorough and recent. Otherwise the buyer performs fuller diligence.
How long does it take?
Typically two to three weeks.

Discuss your requirements with our team