What Is Due Diligence?

What due diligence means in plain words

Before you buy a used car, you look under the hood and ask for the service history. Due diligence is the same habit applied to a company. An investor has heard your pitch and liked it. Now they want to see the evidence behind each claim before they wire money.

The phrase is also used more loosely for any careful checking before a decision. Researching a market before you commit to an idea is a form of due diligence on your own plan, and it costs far less than the kind an investor does later.

How due diligence works in a funding round

1. Pitch and interest. You present your pitch deck and the investor decides they want to go further.
2. Term sheet. They send a term sheet, a short document with the main terms of the deal. It is usually not binding on the investment itself.
3. Document request. They send a list of what they want to see. You share the files in a data room, which is a shared online folder with controlled access.
4. Questions and calls. They ask follow-up questions, test the product and may speak to some of your customers.
5. Close. If nothing serious turns up, lawyers finish the final documents and the money arrives. If something does, the terms may change or the deal may end.

A worked example

This case is invented to show what a check looks like. Say your deck states $10,000 of monthly recurring revenue from 50 customers. During due diligence the investor matches that against your payment records and finds:

• 38 customers paying, for a total of $7,600 a month.
• 8 customers on a free trial, which you counted at full price: $1,600.
• 4 customers who cancelled last month and were still in the total: $800.

$7,600 + $1,600 + $800 = $10,000, so the deck figure was 32% higher than real paying revenue ($2,400 / $7,600). Nobody lied on purpose, but the investor now doubts every other number. Had the deck said $7,600 paid plus 8 trials, the same facts would have built trust. You can keep the figure honest with the MRR calculator and track cancellations with the churn rate calculator.

Why it matters for a first-time founder

You meet formal due diligence late, when you raise money or sell the company. The preparation starts much earlier. The habits that make it painless are cheap at the start and expensive to fix later: keep business money separate, put agreements in writing, record who owns what and keep a note of where each number comes from.

The same applies to your claims about the market. An investor will ask how you know the problem is real and how you sized the opportunity. Notes from customer interviews and figures with named sources answer both. Fonda's reports cite their sources, and its journey has you talk to real customers before the Verdict. Either way, the evidence you gather while validating your idea is the evidence you show later. If you plan to raise soon, the pre-seed funding page explains what the earliest investors expect.

Common mistakes

• Rounding up. Counting trials, pilots or verbal promises as revenue.
• Handshake deals. Equity promised to an early helper with nothing in writing.
• Missing ownership paperwork. A freelancer built the first version and never signed over the rights.
• Hiding a problem. A known issue you disclose is a discussion. One the investor finds is a broken deal.
• Slow answers. Taking weeks to find basic documents signals a disorganized company.
• Not checking the investor. Ask other founders they funded how they behave when things go badly.

Related terms

• Term sheet: the offer that usually comes before the detailed checks.
• Cap table: the record of who owns how much of the company.
• Venture capital: the investors who run the most detailed checks.