The Angel Investor's Due Diligence Checklist: 22 Essential Items
Due diligence is the process that separates informed angel investing from gambling. Yet many individual investors skip or rush through it, either because they lack a structured framework or because the excitement of a promising deal overrides their discipline.
This checklist provides 22 essential items organized across five categories. Not every item applies to every deal. Pre-revenue startups will not have detailed financial metrics. Very early teams may not have a complete cap table. But working through this list systematically ensures you have considered the factors that most often determine whether an angel investment succeeds or fails.
Team Assessment (Items 1-6)
1. Founder-Market Fit
Does the founding team have deep, relevant experience in the problem they are solving? Founders who have personally experienced the pain point they are addressing have a meaningful advantage over those pursuing an opportunity identified through research alone.
What to verify: Prior work experience in the relevant industry, personal connection to the problem, and depth of domain knowledge demonstrated through conversation.
2. Technical Capability
Can this team actually build what they are proposing? For technology startups, evaluate whether the technical co-founder or CTO has the specific skills needed for the product architecture. For non-technical products, evaluate operational execution capability.
What to verify: Technical backgrounds, prior projects or products built, and whether the current product (if any) demonstrates the required technical depth.
3. Team Completeness
Identify critical skill gaps. Every startup needs someone who can build the product, someone who can sell it, and someone who can manage the finances. A team of three engineers with no sales experience faces different challenges than a team with a strong commercial leader but no technical depth.
What to verify: Role coverage across product, sales/marketing, and operations. A plan for filling gaps is acceptable if credible.
4. Founder Commitment
Are the founders working full-time on this venture? Part-time founders signal lower conviction and create execution risk. Exceptions exist (some founders cannot leave employment until funding is secured), but full-time commitment should be the expectation.
What to verify: Employment status, equity vesting schedules, and the founders' stated timeline for full-time engagement.
5. Co-Founder Dynamics
Co-founder conflict is one of the most common reasons early-stage startups fail. Evaluate the relationship between co-founders: how long they have known each other, how they make decisions, and whether they have weathered disagreements.
What to verify: History of the relationship, decision-making process, and equity split (significantly unequal splits can indicate problems).
6. Reference Checks
Speak to people who have worked with the founders in prior roles. Former colleagues, managers, and co-founders provide perspectives that founders themselves cannot.
What to verify: Work ethic, ability to handle adversity, interpersonal skills, and integrity. Pay attention to what references do not say as much as what they do say.
Market Evaluation (Items 7-11)
7. Market Size
Is the addressable market large enough to support a venture-scale outcome? For angel investors, a $1 billion or larger total addressable market is typically needed for meaningful returns, given the dilution that occurs through subsequent funding rounds.
What to verify: Independent market size data from research firms, public company revenues in the category, and bottom-up market sizing based on customer count and pricing.
8. Market Timing
Is the market ready for this solution now? Many good ideas fail because they are too early. Evaluate whether enabling technologies, customer behavior, and market conditions support adoption in the near term.
What to verify: Existing customer interest (waitlists, letters of intent), comparable companies gaining traction, and technology readiness.
9. Competitive Landscape
Who else is solving this problem, and how? Map direct competitors, indirect alternatives, and the do-nothing option that customers currently use.
What to verify: Number and quality of competitors, their funding levels, their traction, and how the startup differentiates.
10. Customer Validation
Have real customers expressed willingness to pay for this solution? The strongest validation is actual revenue. Next best is signed letters of intent or paid pilots. Customer interviews expressing interest are the weakest form of validation.
What to verify: Revenue figures, customer contracts, pilot agreements, or documented customer discovery interviews.
11. Regulatory Environment
Are there regulatory requirements that could affect the product, the market, or the business model? Regulatory risk is not necessarily disqualifying, but it must be understood and factored into your assessment.
What to verify: Applicable regulations, compliance requirements, pending legislation, and the startup's plan for regulatory navigation.
Product Assessment (Items 12-15)
12. Product Status
Where is the product in its development lifecycle? A working product with users is very different from a prototype, which is very different from a pitch deck with no code.
What to verify: Live product demo, user metrics (if available), and development roadmap.
13. Product-Market Fit Evidence
Does the product solve a real problem that customers care about? Look for engagement metrics, retention rates, and qualitative user feedback.
What to verify: User engagement data, retention rates, Net Promoter Score, and qualitative feedback from actual users.
14. Technical Architecture
Is the product built on a scalable architecture? For technology startups, technical debt accumulated in the early stages can become a significant drag on growth.
What to verify: Technology stack, scalability plan, and any technical risks identified by the team.
15. Intellectual Property
Does the startup have defensible intellectual property? This could be patents, proprietary data, unique algorithms, or network effects. Many startups have no formal IP, which is not necessarily disqualifying but affects long-term defensibility.
What to verify: Patents (filed or granted), proprietary datasets, and the startup's plan for building defensible advantages.
Financial Evaluation (Items 16-19)
16. Financial Projections
Review the startup's financial model for internal consistency and reasonableness. Focus less on the specific numbers (which will be wrong) and more on the assumptions underlying them.
What to verify: Revenue growth assumptions relative to industry norms, customer acquisition cost assumptions, hiring plan alignment with growth targets, and path to profitability.
17. Unit Economics
For companies with revenue, evaluate the fundamental unit economics. Customer acquisition cost relative to lifetime value determines whether the business can scale profitably.
What to verify: CAC, LTV, payback period, and gross margin. For pre-revenue companies, evaluate the assumptions about these metrics.
18. Burn Rate and Runway
How fast is the company spending money, and how long will the current raise last? Adequate runway (12 to 18 months minimum) provides enough time to reach milestones that support the next fundraise.
What to verify: Monthly burn rate, total raise amount, projected runway, and key milestones expected within the runway period.
19. Use of Funds
How will the raised capital be allocated? A clear, specific plan for capital deployment is more credible than vague statements about "growth" or "product development."
What to verify: Detailed budget breakdown, hiring plan, and specific milestones tied to capital deployment.
Legal and Structural (Items 20-22)
20. Investment Terms
Review the investment instrument (SAFE, convertible note, or equity) for fairness and market alignment. Key terms include valuation cap, discount rate, pro-rata rights, and any unusual provisions.
What to verify: Comparison against current market terms for similar stage and sector. Flag any non-standard clauses for legal review.
21. Cap Table Review
The cap table reveals the ownership structure and identifies potential issues. Excessive founder dilution, oversized option pools, or complex investor rights can all affect your investment's potential returns.
What to verify: Founder ownership percentages, option pool size and allocation, prior investor rights, and any convertible instruments outstanding.
22. Corporate Structure
Verify that the company is properly incorporated, has clean corporate records, and has no outstanding legal issues.
What to verify: Incorporation documents, IP assignment agreements (ensuring the company owns the IP, not the founders personally), any pending litigation, and compliance with employment laws.
Using the Checklist Effectively
Not every item carries equal weight for every deal. For a pre-revenue startup, financial evaluation focuses on burn rate and projections rather than unit economics. For a solo founder, team assessment focuses on individual capability and plans for building a team.
The checklist's value is not in scoring every item but in ensuring you have considered each dimension before committing capital. Missing one critical factor, such as a regulatory risk or a co-founder dynamic issue, can invalidate an otherwise strong investment.
Use tools like AngelHub to organize your due diligence materials and link them directly to each investment record, ensuring you can reference your research when making follow-on decisions.
Conclusion
Due diligence does not guarantee investment success, but skipping it reliably predicts failure. This 22-item checklist provides a structured framework that ensures you evaluate every deal across the dimensions that matter most. Adapt it to each specific opportunity, document your findings, and use them as a reference point for monitoring the investment over time.
Frequently Asked Questions
How long should due diligence take for an angel investment?
For a typical angel deal, plan for 10 to 20 hours spread over 2 to 4 weeks. This includes document review, founder meetings, reference checks, and market research. Rushed due diligence that skips critical steps is worse than no formal due diligence because it creates false confidence.
Should I do due diligence on every deal I consider?
No. Apply a quick screening filter first: does the opportunity match your investment criteria (sector, stage, geography, check size)? Full due diligence should only be conducted on deals that pass this initial screen, typically 10 to 20 percent of deals you evaluate.
What is the most commonly skipped due diligence item?
Reference checks. Many investors rely on the founder's presentation and their own impression from meetings without speaking to anyone who has worked with the founders. Reference checks frequently surface information that changes an investment decision.
Can I share due diligence with co-investors?
Yes, and it is encouraged. Sharing due diligence with trusted co-investors improves quality through diverse perspectives and reduces duplication of effort. Many angel groups formalize this through shared due diligence reports.