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2026-04-03 · 7 min read

Due Diligence Checklist for Angel Investors

A concise, high-signal checklist for evaluating startup opportunities without spending weeks on manual research.

Due Diligence Checklist for Angel Investors

Angel investment due diligence is the structured verification of startup claims across seven dimensions: company basics, market timing, product traction, team quality, commercial viability, risk indicators, and investment terms. The speed-quality tradeoff exists because angels typically evaluate 20-50+ deals per year — the goal is allocating deep-diligence time to deals that pass initial screening. Industry data suggests angels who complete structured first-pass diligence on all inbound deals close 27% more deals without increasing time spent (PitchBook 2025 Angel Investor Survey).

Use this checklist to move from first inbound to clear conviction.

1. Company Basics

  • Legal entity, headquarters, and operating geography
  • Product category and target buyer
  • Current stage (pre-seed, seed, Series A)

Questions to ask: What state is the company incorporated in and why? Where are the key employees actually located? Does the "SF-based" claim match reality?

2. Market and Timing

  • Clear wedge market where the startup can win now
  • Tailwinds (regulation, platform shifts, buyer behavior)
  • Credible path from niche beachhead to broader expansion

Questions to ask: What specific market is the company targeting? What would need to be true for this to be a $100M market? Why now — what changed in the last 2 years that made this viable?

3. Product and Adoption

  • Product demo quality and onboarding clarity
  • Early customer references with concrete outcomes
  • Usage evidence: activation, retention, and expansion

4. Team

  • Founder-market fit and domain depth
  • Hiring quality in core functions (engineering, sales, operations)
  • Ability to recruit senior talent before scale bottlenecks hit

5. Commercials

  • Revenue composition and margin profile
  • Sales cycle length and win rate by segment
  • Burn multiple and expected runway under conservative assumptions

6. Risk Flags

  • Overstated TAM with weak bottom-up evidence
  • Heavy dependence on one customer, channel, or founder
  • Claims that fail external verification
  • Narrative drift between deck, website, and hiring profile

7. Investment Readiness

  • Round terms and expected ownership
  • Follow-on capital requirements
  • Plausible outcomes: durable independent business vs acquisition path

Diligence Timeline by Pass

PassTimeFocusOutput
First pass45 minAll 7 categories surface-level2-3 areas needing deep-dive
Second pass2-4 hrsFlagged areas onlyData calls, reference checks
Decision30 minSynthesize findingsPass, conditional pass, or pass and lead

Fast scoring template

Score each category from 1 to 5:

  • Market conviction
  • Product traction
  • Team quality
  • Financial discipline
  • Risk-adjusted upside

If any category scores 1, pause and investigate before moving forward.

A high-quality no is as valuable as a high-quality yes.

Run this framework on your next inbound deal.

SoloAnalyst turns public signals into a fast, structured memo before your first founder call.