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Basics

Financial due diligence (FDD)

Also known as: FDD, financial DD, transaction due diligence, accounting due diligence

Definition

Financial due diligence is the workstream of due diligence that tests a target’s earnings, cash, working capital and debt. It establishes what the buyer is actually paying for and what it will need to fund on top of the headline price.

Updated November 2026

Financial due diligence, explained simply

An audit asks whether historical statements comply with the applicable framework. Financial due diligence asks a different question: what will this business earn going forward, and what claims on cash sit alongside the price?

The output is a set of figures the parties can negotiate on: adjusted EBITDA, a normalized working capital level, net debt and debt-like items, and an assessment of cash conversion.

The four questions financial due diligence answers

Illustrative

Each workstream produces a figure that flows into the price or the purchase agreement.

Deliverables

  • Databook: the supporting analysis, usually in Excel, with every adjustment traced to source.
  • Report: a written summary of findings and their price implications.
  • Red-flag memo: in some processes, an early note on issues requiring resolution before further spend.

Worked example

Alder Creek’s information memorandum reports EBITDA of $5.0 million. Diligence identifies a $0.6 million gain on the sale of equipment, which will not recur, and $0.2 million of earned but unrecorded bonuses. It also normalizes the owner’s compensation, adding back $0.25 million paid above a market rate for the role.

After all adjustments, EBITDA is $4.6 million. The unpaid bonuses are also treated as a debt-like item to be settled by the seller at closing.

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

Why it matters in a deal

Financial due diligence determines the earnings base for price, the working capital target, the debt deducted at closing and the protections negotiated in the purchase agreement. Acquisition lenders usually rely on it.

Red flags

  • No reliable monthly financial statements
  • Large manual entries posted at period end
  • Revenue growing materially faster than cash collected
  • Different figures for the same period in different documents

Frequently asked questions

What is financial due diligence (FDD) in M&A?
Financial due diligence is the workstream of due diligence that tests a target’s earnings, cash, working capital and debt. It establishes what the buyer is actually paying for and what it will need to fund on top of the headline price.
Is FDD the same as an audit?
No. An audit gives an opinion on compliance with an accounting framework. FDD analyzes sustainable earnings, cash and claims on cash for a specific transaction.
Is FDD legally required?
No, but institutional buyers and acquisition lenders generally expect it.
How long does it take?
Typically a few weeks to a few months, depending on the size of the business and the quality and availability of data.

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