Paying for outside due diligence on a startup investment makes sense when the check is big enough to matter, the open questions need skills you don't have (code, cap tables, foreign structures), and the round closes before you could learn them. Here's what the data says about diligence and returns, what each kind of provider covers, why who pays matters, and how to judge the price.
When third-party due diligence is worth it
Third-party diligence is worth paying for when three things are true: the check is big enough that losing it would hurt, the open questions need skills you don't have (code, cap tables, a foreign legal structure), and the round will close before you could learn them. If any one is false, a checklist and your own hours usually do the job.
You need all three: a check that would hurt to lose, skills you lack, and no time to learn them.
Most direct investors hit all three more often than they'd admit. Deals come in through friends and co-investors, the deck is the diligence, and by the time you see the round it's "mostly committed." You're going to do diligence either way. The real decision is who does the part you can't.
What the data says about diligence and returns
Diligence correlates with better outcomes, and most angels do little of it. In Wiltbank and Boeker's 2007 study of 539 angels, the median deal got 20 hours of diligence. Exits from deals above the median returned 5.9 times the money invested, against 1.1 times below it. VC firms average 118 hours, per a survey of 885 venture capitalists.
More hours line up with better exits, but which hours you spend matters more than how many.
Two cautions. The angel study shows a correlation and can't prove cause; investors who put in more hours may just be better investors. And the useful hours aren't spread evenly. An hour reading the IP assignment or calling a reference the founder didn't list is worth more than a day on market sizing. When you pay for diligence, you're mostly paying for the right hours, from someone who knows which ones they are.
What each kind of outside help covers
At least five kinds of provider sell something called "due diligence," and each one answers a different question. Your lawyer checks the documents, a background firm checks the people, an AI tool summarizes the public record, a founder-paid report shows what the company wants you to see, and independent investor-side diligence tells you whether to wire.
Five kinds of provider, five different questions. Only one is built to end in a decision.
| Provider | Answers | Does not answer |
|---|---|---|
| Your lawyer | Are the documents sound and the terms standard? | Is the technology real, is the price right, is the deal worth doing? |
| Background-check firm | Do the named people have criminal, civil, sanctions or media issues? | Is the business any good? |
| AI screening tool | What does the deck claim, and what does the public web say? | Is any of it verified? |
| Founder-paid report | What does the company want every investor to read? | Anything the company would rather you didn't know. |
| Independent investor-side diligence | Should you wire, and what would change the answer? | Legal, tax and valuation opinions, which it should flag for counsel. |
The first four are useful inputs. Only the last one is built to end in a decision, and only if you're the one paying for it.
Who pays matters more than what it costs
Diligence the company pays for isn't independent, however good the provider is. A report the founder commissions, or a platform that charges the company to be listed, has a built-in reason to find the deal investable. So does anyone paid on whether the round closes. Ask every provider who pays them before you read a word of their work.
Ask who pays them before you read a word. Founder-paid diligence isn't independent.
Then ask two more questions: is any fee contingent on the investment, and do you or your firm hold, or plan to hold, a position in this company? Get the answers in writing. If you're an advisor who'll have to explain a direct deal to a client later, you'll want that record as much as the findings.
What independent diligence costs
There's no reliable public price list for investor-side startup diligence. Providers quote per engagement and price by scope, so check size doesn't set the fee. A first-pass screen costs a fraction of a full review, and specialist work, like a technical code review or a foreign-structure review, is priced on top.
Judge the fee against the check. $8,500 on a $250,000 check is 3.4% of what's at risk.
Judge the price against the check. On a $250,000 check, an $8,500 review is 3.4% of the amount at risk. On a $1 million check it's under 1%. And skipping it isn't free. You either spend 20 to 40 of your own hours, or you make the call without them.
A simple rule for when to buy
Buy an outside read when the check is at least ten to twenty times the fee, when the deal's key risk is one you can't evaluate yourself, or when you'll have to defend the decision to someone else, like a client, a spouse or an investment committee. Any one of those is enough.
Any one is enough: a big check, a risk you can't judge, or a decision you'll have to defend.
Skip it on small checks into companies you know well, or when you can run the key checks yourself before the round closes. And if the deal fails a cheap check first (the IP isn't in the company, the round label doesn't match the price, a founder's history doesn't match the record), you don't need a full review at all. That's why a short screen before a full engagement is usually the right first purchase.
When to bring in an outside read
Olivent Diligence is independent, investor-paid diligence for family offices, RIAs and angel groups that invest directly without a venture team. A Pre-Wire Screen is $2,500 and returns a verdict in 48 hours. A Full Diligence is $8,500 in five business days, with add-ons for a technical deep dive, a team and integrity investigation, and an Israel structure review. Every memo discloses whether Olivent has looked at or holds the company, and nothing is ever paid by the founder.
Investor-paid, never founder-paid, with any Olivent tie to the company disclosed in the memo.
Frequently asked questions
- Should I hire a third party for startup due diligence?
- Hire one when the check is big enough that losing it would hurt, the key risk is one you can't evaluate yourself (the technology, the cap table mechanics, a foreign legal structure), and the round will close before you could learn it. On small checks into companies you know well, a checklist and your own hours are usually enough.
- How much does independent startup due diligence cost?
- There's no public price list. Providers quote per engagement and price by scope, and check size doesn't set the fee. As one published example, Olivent Diligence charges $2,500 for a 48-hour Pre-Wire Screen and $8,500 for a Full Diligence in five business days, paid only by the investor. Judge the fee against the check: $8,500 is 3.4% of a $250,000 check.
- Does more due diligence lead to better returns?
- It correlates with them. In Wiltbank and Boeker's 2007 study of angel group returns, exits from deals with more than the median 20 hours of diligence returned 5.9 times the money invested, against 1.1 times for deals below the median. The authors point out it's a correlation, and that the quality of the hours matters too.
- How many hours of due diligence do venture capitalists spend?
- A survey of 885 venture capitalists by Gompers, Gornall, Kaplan and Strebulaev found the average firm spends 118 hours on due diligence over an average 83 days to close, and calls 10 references. Early-stage firms averaged 81 hours and 8 references.
- Is a founder-paid diligence report independent?
- No. A report the company commissions, or a platform the company pays to be listed on, is paid for by the party being judged. It can be a useful input, but it isn't an independent view. Ask any provider who pays them and whether any fee depends on the investment closing.
- Does my lawyer's review count as due diligence?
- It covers the legal documents: the charter, the SAFE or purchase agreement, reps and warranties, closing conditions. It doesn't test whether the technology exists, whether the price fits the stage, or whether the founders' history matches the pitch.
Sources
- Returns to Angel Investors in Groups (Robert Wiltbank and Wade Boeker, Kauffman Foundation and Angel Capital Education Foundation, November 2007)
- How Do Venture Capitalists Make Decisions? (NBER Working Paper 22587) (Gompers, Gornall, Kaplan and Strebulaev, NBER, 2016; Journal of Financial Economics, 2020)
- Best Practice Guidance for Angel Groups: Due Diligence (David Eyler, Angel Capital Education Foundation, July 2007)Gives no recommended number of diligence hours.
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Educational content, not tax, legal or investment advice. Nothing here is an offer to sell or a solicitation to buy securities; any offer is made only to eligible investors through the fund's offering documents.