Commercial Due Diligence for SaaS: the checklist buyers and founders both need

By Igor Bolombo-Mouazan, founder of RevFusion. Commercial due diligence for investors and acquirers in B2B SaaS.

Financial due diligence tells you what already happened. Commercial due diligence tells you whether the revenue will keep coming — and whether the engine that produced it is real, repeatable and transferable. In SaaS, where valuation rides on the durability of recurring revenue, skipping it is how buyers end up owning a forecast made of fiction.

Here's the checklist I use to pressure-test a SaaS commercial engine before an investment or acquisition — useful for buyers running diligence, and for founders who want to be ready for it.

1. Pipeline quality

Is the pipeline real or decorative? Score a sample of open deals against evidence — economic buyer, compelling event, decision process, multi-threading (the Pipeline Reality Score). A pipeline that collapses under scrutiny is the single biggest red flag.

2. Forecast reliability

Pull the last four to eight quarters of forecast versus actual. A wide, erratic Forecast Fiction Gap means the company can't predict its own revenue — which means neither can you.

3. Retention and expansion

Gross and net revenue retention, logo churn, and why customers leave. Strong net retention can carry a mediocre new-business motion; weak retention quietly drains every euro you'll invest in growth.

4. Go-to-market efficiency

Acquisition cost, payback period, and the trend over time. You're not hunting for a perfect number — you're checking whether the unit economics are improving or deteriorating, and whether growth was bought or earned.

5. Concentration and key-person risk

How much revenue sits with the top handful of customers? How much pipeline depends on the founder personally closing? A motion that only works when the founder is in the room is not a transferable asset.

6. Sales process and system maturity

Is there a defined, repeatable process with exit criteria per stage — or heroics dressed up as a method? Repeatability survives the transaction; heroics walk out the door.

7. Team

Rep ramp time, attainment distribution (is one star carrying the number?), attrition, and the strength of the second line. Concentrated performance is concentrated risk.

8. Data integrity

If the CRM is a mess, every number above is a guess. Data hygiene is both a finding in itself and a tax on the quality of every other conclusion.

How to run it

A focused commercial diligence runs in a couple of weeks: a structured data request, deal-level scoring on a sample, management and rep interviews, and a synthesis that separates durable revenue from at-risk revenue — with the value of each quantified. The deliverable is a clear read on whether you're buying an engine or a story.

Frequently asked questions

What is commercial due diligence in SaaS?
An assessment of whether a SaaS company's revenue is real, repeatable and transferable — covering pipeline quality, forecast reliability, retention, GTM efficiency, concentration, process maturity and team.

How is it different from financial due diligence?
Financial DD verifies what happened in the numbers. Commercial DD assesses whether the engine behind those numbers will keep producing after the deal.

Who needs it?
Investors and acquirers assessing a SaaS target — and founders preparing to raise or sell, who want to fix red flags before someone else finds them.

How long does it take?
Typically a couple of weeks for a focused engagement, depending on data availability and deal size.

Where to start

Whether you're buying or being bought, the questions are the same. RevFusion runs commercial due diligence on request — or start with a free flash diagnosis to scope it.