Third-party due diligence on a startup investment: when it is worth it and what it costs
By Adam YohananPublished
Paying for outside due diligence on a startup investment makes sense when the check is large enough to matter, the open questions need skills you lack (code, cap tables, foreign structures), and the round closes before you could learn them. This guide covers 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 large enough that losing it matters, the open questions need skills you do not have in house (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 are usually enough.
Most direct investors meet all three conditions more often than they admit. Deals arrive through friends and co-investors, the deck is the diligence, and the round is already "mostly committed" by the time you see it. The decision is not whether to do diligence but who does the part you cannot.
What the data says about diligence and returns
The data says diligence correlates with better outcomes, and that 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. Institutional firms spend far more: 118 hours on average, per a survey of 885 venture capitalists.
Two cautions. The angel study measures a correlation, not a cause; investors who spend more hours may also be better investors. And the useful hours are not evenly spread: an hour reading the IP assignment or calling an unlisted reference is worth more than a day on market sizing. Paying for diligence is mostly paying for the right hours, from someone who knows which ones they are.
What each kind of outside help covers
"Due diligence" is sold by at least five kinds of provider, and each one answers a different question:
| 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 prefer you did not 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 is built to end in a decision, and only if it is paid by you.
Who pays matters more than what it costs
Diligence paid for by the company is not independent, however good the provider. A report commissioned by the founder, or a platform that charges the company to be listed, has an incentive to find the deal investable. The same applies to anyone paid on whether the round closes. Ask every provider three questions: who pays you, is any fee contingent on the investment, and do you or your firm hold, or plan to hold, a position in this company.
The answers should be in writing. An advisor who has to explain a direct deal to a client later will want that record as much as the findings.
What independent diligence costs
There is no reliable public price list for investor-side startup diligence; providers quote per engagement. Costs follow scope rather than check size: a first-pass screen is a fraction of a full review, and specialist work (a technical code review, a foreign-structure review) is priced on top.
The useful way to judge the price is 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 is under 1%. The alternative cost is not zero: it is either your own 20 to 40 hours or a decision made 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 cannot evaluate yourself, or when you will have to defend the decision to someone else, such as a client, a spouse or an investment committee. Skip it on small checks into companies you know well, or when you can run the key checks yourself before the round closes.
If the deal fails a cheap check first (the IP is not in the company, the round label does not match the price, a founder's history does not match the record), you do not need a full review at all. That is 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.
Frequently asked questions
- Should I hire a third party for startup due diligence?
- Hire one when the check is large enough that losing it matters, the key risk is one you cannot 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 is no public price list; providers quote per engagement, and the cost follows scope rather than check size. 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 note this is 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 is not 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 does not 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.