The Startup Due Diligence Checklist: Every Document Investors Will Ask For

 


Once a term sheet is signed, the champagne barely has time to go flat before due diligence begins. It's the stage where an investor's legal, financial, and commercial teams pick apart everything a founder claimed during the pitch and the founders who breeze through it are almost always the ones who had the paperwork ready before anyone asked. Here's what actually goes into a startup due diligence checklist.

Corporate and Legal Documents

This is usually where due diligence starts, because it establishes whether the company legally exists in the form investors think it does. Expect requests for the certificate of incorporation, the articles of association, and a full history of board resolutions since founding. Investors will also want the cap table, fully diluted meaning every option, warrant, SAFE, and convertible note accounted for, not just the headline ownership split.

Shareholder agreements, prior funding documents, and any side letters from earlier rounds all get reviewed too, since inconsistencies between what founders say ownership looks like and what the paperwork actually shows are one of the fastest ways to stall a deal.

Intellectual Property

IP due diligence deserves its own line item because it's where deals quietly die. Investors will ask for IP assignment agreements covering every employee and contractor who ever touched the product and missing assignments are one of the single most common legal issues that delay or kill a funding round. If a former contractor built a core piece of the product and never formally assigned that IP to the company, it's a gap investors will find, and one that's far harder to fix retroactively than it would have been to prevent.

Financial Records

Financial due diligence covers the numbers behind the pitch: general ledger, tax returns, cash flow statements, and outstanding debt or convertible instruments. Investors will also want financial projections spanning several years with clearly stated assumptions, plus the unit economics underneath them customer acquisition cost, lifetime value, and gross margin, broken down by product where relevant. The goal isn't just confirming the numbers are accurate; it's confirming they'd hold up if the business had to be unwound.

Commercial and Operational Contracts

Key customer and vendor contracts get reviewed to understand how revenue is actually secured and how dependent the business is on any single relationship. Employment agreements for executives, option plan documents, and any pending or threatened litigation round out this section investors want to know not just what the business looks like today, but what obligations and risks are quietly sitting in the background.

Regulatory Compliance

Depending on the sector, investors will also ask for documentation showing the business complies with relevant regulation data protection, industry-specific licensing, or sector rules that apply to the product itself. A startup operating in a lightly regulated space may clear this quickly; one in fintech, health, or another regulated sector should expect this section to get real scrutiny.

How Long This Actually Takes

Due diligence depth scales with the size of the round. Angel and pre-seed rounds typically involve one to two weeks of basic legal and team checks. Seed rounds run two to four weeks and add a first real look at financials and product. Series A rounds stretch to four to six weeks of comprehensive legal, financial, IP, and commercial review, and Series B and beyond can take six to eight weeks of institutional-grade diligence across every category above.

The Founders Who Get Through It Fastest

The common thread among founders who move through due diligence smoothly isn't luck it's preparation. Building a data room before outreach even begins, rather than scrambling to assemble documents once an investor asks, turns a multi-week review into a formality instead of a bottleneck. Due diligence rewards founders who treat their paperwork as seriously as they treat their pitch.

I read this checklist on Entrepreneur Plus UK, which broke down exactly what investors look for once a term sheet is signed and the real scrutiny begins.

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