Due diligence is where a pitch deck meets reality, and where most avoidable losses get prevented.
Blake Aber · Predicate Ventures
What Due Diligence Actually Tests
Startup due diligence is the structured process of verifying what a founder claims before money changes hands. It exists because pitches are optimized for persuasion and reality rarely matches the slide.
The goal is not to find a perfect company. Perfect companies do not raise from outside investors. The goal is to understand the specific risks you are accepting and price them correctly.
Good diligence answers three questions. Is this business what the founder says it is? Can it grow at the rate the model assumes? And what could quietly destroy it after you wire the funds?
Team and Founder Diligence
At the earliest stages, the team is most of the bet. The product will change. The market may shift. The people are who you are funding to respond.
Start with references, and weight backchannel references over the ones founders provide. A founder's chosen references confirm strengths. Former colleagues, ex-cofounders, and prior investors reveal patterns.
Look at how founders split equity and why. An uneven split with no clear rationale, or a departed cofounder still holding a large stake, signals future conflict. Cap table problems compound with every round.
Assess decision-making under pressure. Ask about the hardest call they made in the last year and what they got wrong. Founders who narrate only wins are either inexperienced or rehearsed.
Red Flags in the Team
Watch for founders who cannot explain why prior team members left. Watch for a single founder claiming every key skill. And watch for resistance to introductions, since founders who control access often control information.
Market and Competitive Diligence
Founders routinely cite a large total addressable market by counting everyone who could theoretically buy. The relevant number is the segment they can reach and convert in the next few years.
Test the market claim against actual buyer behavior. Talk to potential customers who are not on the founder's reference list. Ask whether the problem is something they would pay to solve today or something they tolerate.
Map the competition honestly. A founder who says they have no competitors usually means customers are solving the problem some other way, often by doing nothing. That alternative is the real competitor.
Examine timing. Many failed startups had the right idea early. Ask what changed recently that makes this the moment, and whether the answer is a specific shift or wishful thinking.
Product and Technology Diligence
Verify that the product does what the demo shows. Demos are staged. Request access to a live environment or a recorded session of real usage, not a scripted walkthrough.
For technical companies, bring in someone who can read the architecture. The question is not whether the code is elegant. It is whether the system can handle the growth the financial model assumes without a rebuild.
Check dependency risk. A product built entirely on one platform's API or one vendor's pricing inherits that party's decisions. Founders often underweight this because it has not bitten them yet.
Review the product roadmap against the team's actual capacity. Ambitious roadmaps with small teams tend to produce missed timelines, which produce missed revenue.
Financial Diligence
Start with the bank statements, not the model. The model is a forecast. The statements are facts. Reconcile reported revenue against actual cash received.
Understand the unit economics at the level of a single customer. What does it cost to acquire one, what do they pay over time, and how long until that customer is profitable. If the founder cannot produce these numbers cleanly, the business does not understand itself.
Separate recurring revenue from one-time revenue. A company that books large setup fees can look like it is growing while its actual subscription base stays flat.
Scrutinize the burn rate and runway. Compare the stated runway to the spending trend over the last six months. Burn often accelerates faster than founders project, especially right after a raise.
Common Financial Distortions
Look for revenue recognized before it is earned. Look for churn buried inside net revenue figures. And look for related-party transactions that inflate traction, such as revenue from a founder's other company.
Legal and Structural Diligence
Review the cap table in full, including options, SAFEs, convertible notes, and any side letters. Surprises here change the price of the deal and sometimes the viability of it.
Confirm intellectual property ownership. IP developed by contractors or by founders while employed elsewhere may not belong to the company. This is a frequent and expensive gap.
Check for pending litigation, regulatory exposure, and any agreements that limit the company's freedom to operate. Exclusive contracts and aggressive customer terms can constrain future growth.
Verify that prior funding was documented correctly. Sloppy paperwork from earlier rounds tends to surface at the worst time, usually during a later raise or an acquisition.
Calibrating Depth to Stage
The amount of diligence should match the check size and the stage. A pre-seed investment in two founders and a prototype does not warrant a forensic financial audit, because there is little to audit.
At seed, weight team and market. At Series A and beyond, financial and legal review carries more load because there is a real operating history to examine.
Diligence has a cost in time and in goodwill. Pushing a strong company through an exhausting process can lose you the deal to a faster investor. Match rigor to risk.
Turning Diligence Into a Decision
The output of diligence is not a yes or no. It is a list of risks, each with a severity and a likelihood. Some are dealbreakers. Most are conditions you accept or terms you adjust.
Write down what would have to be true for the investment to fail. If diligence cannot rule out those failure modes, you have your answer regardless of how good the founder sounds.
The investors who avoid the most damage are not the ones who run the longest checklists. They are the ones who know which two or three risks actually matter for this specific company and refuse to wire until those are understood.
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