Late-Stage Due Diligence Red Flags That Kill Signed Deals

A signed term sheet feels like the finish line. It is not. Between the term sheet and the money arriving, investors carry out confirmatory due diligence, and deals still fall apart at this stage, sometimes over problems founders knew about and hoped would not surface.

Most late-stage deal failures are preventable. This guide covers the red flags that most often derail signed deals and how founders can find and fix them before investors do.

1. Revenue and Financial Red Flags

• Revenue that does not match the pitch, such as pilots or one-off projects presented as recurring revenue.
• Aggressive revenue recognition, booking revenue before it is earned.
• Undisclosed churn or customer losses since the pitch.
• Related-party revenue from companies connected to founders or investors.
• Hidden liabilities, such as undisclosed debt, unpaid taxes or deferred obligations.
• Inconsistencies between the financial model, accounts and data room.

2. Cap Table and Equity Red Flags

• Cap table errors, such as promised equity that was never documented or shares issued incorrectly. See what a cap table is and why it matters.
• Missing 83(b) elections for founders, which can create tax problems.
• Outdated or missing 409A valuations for option grants.
• Unclear convertible instruments, such as SAFEs or notes with conflicting terms.

3. Intellectual Property Red Flags

• Missing IP assignments from founders, employees or contractors, meaning the company may not own its own technology.
• Work created at a previous employer or university that may claim ownership.
• Open-source licence violations.
• Data rights problems for AI companies. See data rights and licensing risk.

4. Legal, People and Compliance Red Flags

• Undisclosed litigation or disputes, including with former co-founders.
• Employee misclassification, such as treating employees as contractors.
• Regulatory or licensing gaps in regulated industries.
• Security incidents not disclosed. See cybersecurity due diligence.
• Founder background issues revealed by reference or background checks.
• Key customer or partner contracts with change-of-control or termination clauses.

5. The Biggest Red Flag: Surprises

Investors can often accept problems that are disclosed early, explained honestly and accompanied by a plan to fix them. What kills deals is discovering something material that founders knew about and did not mention. It raises the question of what else has not been disclosed.

6. How to Prevent Late-Stage Failures

1. Run your own diligence first, ideally with your lawyer and accountant, before starting a fundraise. See how founders can prepare for due diligence.
2. Fix what you find: sign missing IP assignments, clean the cap table, update 409As.
3. Build a complete data room before term sheets arrive. See building a data room.
4. Disclose known issues early, with context and remediation plans.
5. Keep numbers consistent across the deck, model and accounts.

Frequently Asked Questions

How long does confirmatory due diligence take?

Often a few weeks, depending on the company's complexity, the round size and how organised the data room is.

Can an investor walk away after signing a term sheet?

Yes. Most term sheets are non-binding on the investment itself, apart from provisions like confidentiality and no-shop clauses.

What is the most common deal-killer?

Material issues that were known but not disclosed, especially around revenue, IP ownership or the cap table.

Should I disclose problems before the term sheet?

Material issues should be disclosed early. It builds trust and avoids renegotiation or collapse later.

The Bottom Line

Signed deals fail when due diligence uncovers problems founders could have found and fixed first. Running your own diligence, cleaning up equity and IP, building a complete data room and disclosing issues honestly turns confirmatory diligence into a formality rather than a threat.

Global Capital Network helps founders prepare for investor diligence through our investor relations services and events. Get in touch to learn more.

This article is general information, not legal or financial advice.