The 25 Best Questions to Ask a Startup Founder Before Investing

The first call with a founder is a two-way evaluation: they're selling you on the vision, and you're verifying whether reality matches the narrative. Most founders come prepared to talk about their company. Few are prepared for a rigorous question-and-answer session on the specifics.

The goal of the first call is not to make a decision — it's to qualify or disqualify. You want to find the 2-3 things that need deep-dive in the second call, and the 1-2 things that are automatic disqualifiers.

In our analysis of 300+ first call reviews, investors who asked the right questions in the first call made better pass/continue decisions and spent 40% less time on deals that didn't deserve deeper diligence.

Product and Market (5 Questions)

1. "What specific problem does this solve, and for whom?"

What you want to hear: Specific problem description tied to a specific customer segment with verifiable current behavior.

Red flag: "We're building for everyone who has this problem" or vague problem descriptions that don't tie to a specific job-to-be-done.

2. "How do customers discover you today?"

What you want to hear: Specific acquisition channels with actual numbers. "We get 30% of our users from cold outreach, 40% from inbound, and 30% from referrals."

Red flag: "Word of mouth" without specifics, or "we haven't focused on marketing yet because we're product-led."

3. "What would a customer pay for the current alternative, in time or money?"

What you want to hear: Specific workaround costs that validate the problem is painful enough to pay to solve.

Red flag: Unable to quantify what customers currently pay or do, or answers that describe features not jobs-to-be-done.

4. "What's your retention curve, and what happens at day 1, day 7, and day 30?"

What you want to hear: Specific retention numbers by cohort. Ideally, day-7 retention above 40% and day-30 above 20% for a B2C SaaS.

Red flag: Won't show cohort data, retention described as "good" without numbers, or retention that drops to near-zero after day 7.

5. "Why now? Why is this the right time to start this company?"

What you want to hear: Specific timing catalyst — regulatory change, technology shift, market timing, or personal insight that wasn't available 2 years ago.

Red flag: No specific catalyst, or "we've always wanted to build this."

Traction and Metrics (4 Questions)

6. "What are your current monthly numbers — revenue, users, and churn?"

What you want to hear: Specific numbers that tie to financial statements or verified payment data.

Red flag: Numbers that don't match what you'd expect given their headcount and burn rate, or "we don't track that yet."

7. "What's your net revenue retention?"

What you want to hear: NRR above 100% for an established B2B SaaS (expansion revenue exceeds churn).

Red flag: "We're too early to calculate that" — if they have 12+ months of data, they should know this.

8. "What's your CAC payback period, and how did you calculate it?"

What you want to hear: Specific payback period under 12 months for SMB, under 18 months for enterprise.

Red flag: Can't calculate CAC by channel, payback period over 24 months without justification.

9. "Show me your unit economics by channel."

What you want to hear: CAC, LTV, and LTV:CAC ratio by acquisition channel.

Red flag: One-size-fits-all unit economics when they clearly have multiple channels.

Competition and Market (4 Questions)

10. "Who are your top 3 competitors, and what do you do differently?"

What you want to hear: Named competitors with specific differentiation. "We do X better than Competitor A in these dimensions, and we target a different segment than Competitor B."

Red flag: "We're the only one doing X" (almost always false), or named competitors that aren't actually competitors.

11. "How do you prevent a large company from copying what you've built?"

What you want to hear: Specific, defensible moat — network effects, data moat, proprietary technology, regulatory protection, or speed advantage.

Red flag: "They can't move as fast as us" without specific evidence, or vague "brand" moat claims.

12. "What's your beachhead market, and why can't you expand beyond it yet?"

What you want to hear: Specific initial market segment that's large enough to build a business but focused enough to win.

Red flag: Vague "we can serve everyone" without a clear starting point.

13. "What's the most legitimate competitor that could put you out of business?"

What you want to hear: Named competitor with honest assessment of their strengths.

Red flag: Dismissive of all competitors without specifics, or "nobody is doing exactly what we're doing."

Team and Founders (5 Questions)

14. "Why are you the right team to solve this problem?"

What you want to hear: Specific prior experience in the domain, unique insight from personal experience, or demonstrated ability to execute in the same space.

Red flag: Generic "we're a world-class team" without domain-specific evidence.

15. "What do you not yet have that you need?"

What you want to hear: Honest acknowledgment of gaps — sales hire needed, technical co-founder missing, regulatory expertise absent.

Red flag: "We have everything we need" is usually a sign of overconfidence or lack of self-awareness.

16. "How do you make decisions when the team disagrees?"

What you want to hear: Specific decision-making framework — who has final say, how trade-offs are made.

Red flag: No clear framework, or "we've never really disagreed."

17. "What would have to be true for this company to fail?"

What you want to hear: Specific, honest risk assessment. "If we can't hire a VP sales in the next 6 months, we won't have the channel to hit our numbers."

Red flag: "I don't think about failure" or generic risk language that doesn't identify specific execution risks.

18. "What do founders get wrong about your space?"

What you want to hear: Specific misconceptions others have about the market or the problem.

Red flag: No answer or can't articulate what founders in adjacent spaces get wrong.

Financials and Business Model (4 Questions)

19. "What's your burn rate, and what does it consist of?"

What you want to hear: Specific breakdown — payroll X%, marketing Y%, servers Z%.

Red flag: Burn rate that doesn't match headcount or stage.

20. "What's your path to profitability?"

What you want to hear: Specific milestones with timeline — "We hit profitability at $2M ARR with our current team."

Red flag: "We're focused on growth, not profitability" without a specific plan for when that changes.

21. "What are you raising this round for specifically?"

What you want to hear: Specific milestones this capital unlocks — "Hiring 3 engineers to ship X feature, which gets us to Y revenue."

Red flag: Vague "to grow" without specific bets tied to milestones.

22. "What are your next 2-3 fundraising milestones?"

What you want to hear: Specific metrics that trigger the next round at good terms — "We raise at Series A when we hit $1M ARR."

Red flag: No plan for when to raise next, or plan that requires a down round.

Deal Structure and Terms (3 Questions)

23. "What are the key terms you're looking for in this round?"

What you want to hear: Specific terms they care about — valuation, board seats, investor expertise.

Red flag: "We're flexible on terms" — usually means they don't understand the terms.

24. "Who else is in this round, and at what valuation?"

What you want to hear: Named co-investors or specific valuation anchors.

Red flag: "I can't disclose other investors" before a terms agreement — unusual for seed.

25. "If I pass, would you mind if I followed up in 6 months?"

What you want to hear: Enthusiastic yes (they're confident in the trajectory) or honest no (they won't need it).

Red flag: "Only if something changes" when the fundamentals haven't shifted.

The Red Flag Response Scorecard

For a full company verification before your first call, visit soloanalyst.com.