Startup Due Diligence Checklist for Angel Investors (2026)

Due diligence is the process of verifying the claims made by a startup during their pitch. For angel investors, this process is often the difference between a calculated risk and a blind gamble. While early-stage investing always carries risk, a structured approach ensures that you are aware of the "known unknowns" before committing capital.

In 2026, the bar for due diligence has shifted. Investors are looking beyond just "growth at all costs" and focusing on unit economics, founder integrity, and verifiable technical moats. The following checklist provides a framework for evaluating pre-seed to Series A opportunities.

This checklist is organized into eight core dimensions of a startup's health. Use it to guide your deep-dive sessions and founder interviews.

1. Team & Founders

• ✓ Founder background verification (employment history, education, prior exits).
• ✓ Technical vs. Business skill balance within the core team.
• ✓ Founder dynamics (how long have they worked together, equity split).
• ✓ Reference checks from former colleagues or investors.
• ✓ Commitment level (are all founders full-time?).

2. Product & Technology

• ✓ Product demo and roadmap validation.
• ✓ Technical moat (patents, proprietary algorithms, or data network effects).
• ✓ Scalability of the current tech stack.
• ✓ Codebase health and documentation (if applicable).
• ✓ Third-party dependencies and vendor risks.

3. Market Size

• ✓ TAM/SAM/SOM calculations based on realistic bottom-up data.
• ✓ Market growth rate and tailwinds (PEST analysis).
• ✓ Customer persona definition and pain point urgency.
• ✓ Regulatory environment and potential hurdles.

4. Traction & Revenue

• ✓ Monthly Recurring Revenue (MRR) or Annual Recurring Revenue (ARR) verification.
• ✓ Customer acquisition cost (CAC) vs. Lifetime value (LTV) trends.
• ✓ Churn rate and retention cohorts.
• ✓ Sales pipeline health and conversion rates.

5. Financial Projections

• ✓ P&L statement accuracy for the last 12-24 months.
• ✓ Burn rate and current runway (months remaining).
• ✓ Capital efficiency (revenue generated per dollar burned).
• ✓ Reasonableness of future growth assumptions.

6. Legal & IP

• ✓ Articles of incorporation and capitalization table (Cap Table).
• ✓ Intellectual property assignments (do founders own the IP?).
• ✓ Pending litigation or outstanding liabilities.
• ✓ Trademark and domain ownership.

7. Competitive Landscape

• ✓ Direct and indirect competitor mapping.
• ✓ Startup's unique value proposition (UVP).
• ✓ Barrier to entry for new competitors.
• ✓ Incumbent response risk.

8. Exit Potential

• ✓ Comparable acquisition multiples in the sector.
• ✓ Potential strategic acquirers list.
• ✓ IPO window and sector sentiment.
• ✓ Alignment between founders and investors on exit strategy.