FDD vs QoE: What's the Difference, and Which Does Your Deal Need?
The two terms get used interchangeably, and it causes real problems in scoping conversations. A seller asks for "diligence on the numbers," gets quotes for three different scopes, and cannot tell why one is four times the price of another. Here is how the two actually relate.
The short answer
Quality of earnings (QoE) is one part of financial due diligence (FDD), not a synonym for it. A QoE answers one question: are the reported earnings real, sustainable and repeatable? A full FDD answers that question and several others the buyer will care about at closing.
What a QoE covers
A quality of earnings analysis is built around the EBITDA bridge. The team takes reported profit and rebuilds it into a defensible normalized EBITDA: testing seller addbacks, stripping one-off items, benchmarking owner remuneration, and checking that revenue recognition is not flattering the picture. Revenue quality gets particular attention — customer concentration, contract-level revenue testing, cut-off around the reporting date.
Deliverable: an EBITDA bridge, a revenue quality assessment, and a short list of issues that move the number the deal is priced on.
What full FDD adds on top
- Net working capital. How the business's NWC actually behaves month to month, what a normal peg looks like, and where a poorly drafted peg will cost the buyer money after closing. See our NWC and peg analysis guide.
- Net debt and debt-like items. Items that belong in the debt definition but will not appear in the seller's headline number: factoring, lease liabilities, deferred revenue on long contracts, accruals for known disputes.
- Balance sheet quality. Whether receivables are collectable, inventory is valued sensibly, and provisions are complete.
- Cash flow. Whether reported EBITDA actually converts to cash, or whether working capital and capex quietly absorb it.
- Forecast credibility. Whether the management plan the valuation rests on has any historical basis.
Side by side
| QoE (standalone) | Full FDD | |
|---|---|---|
| Core question | Are earnings repeatable? | Is the whole financial picture what the buyer thinks it is? |
| Covers | EBITDA bridge, addbacks, revenue quality | QoE + NWC, net debt, balance sheet, cash flow, forecasts |
| Typical timeline | 2–3 weeks | 3–4 weeks |
| Feeds into | Price negotiation on EBITDA | Price, working capital peg, SPA warranties and indemnities |
| Typical buyer | Smaller deals, narrow budgets | PE-backed and mid-market acquisitions |
Which scope fits which deal
A red flag or light QoE scope is defensible when the deal is small, the data room is thin, or the buyer mainly needs to confirm nothing catastrophic is hiding in the numbers. We wrote about matching scope to deal size in light QoE vs full QoE.
Full FDD earns its cost when any of these are true: the price is set off a multiple of EBITDA, there is a working capital peg in the SPA, the target is a carve-out with shared costs, or financing depends on a lender underwriting the normalized numbers. In those deals the FDD fee is usually recovered several times over by a single finding — a rejected addback, a debt-like item the seller missed, or a peg definition that would have cost the buyer at closing.
How we scope it
We will tell you which scope the deal actually warrants rather than defaulting to the larger one. On narrow deals we run a light QoE; on mid-market transactions the full FDD produces a databook that serves diligence and the SPA negotiation in one document. If you want an independent view of what your deal needs, talk to us — first cut in 48–72 hours.
Frequently asked questions
Is quality of earnings the same as financial due diligence?
No. QoE is one component of a full financial due diligence scope. FDD covers earnings quality plus net working capital, net debt, cash flow, forecast credibility and balance sheet exposure. A QoE-only scope looks at earnings alone.
Can a deal do FDD without a QoE?
A deal can commission a narrower FDD scope that skips deep earnings testing, but for most mid-market acquisitions the earnings bridge is the core of the work, so QoE sits inside almost every FDD engagement.
Which do lenders and investors require?
Private equity buyers almost always commission FDD with a full QoE section. Acquisition lenders typically want the QoE and the normalized EBITDA bridge, because their leverage is sized off that number.