How do VCs actually underwrite seed investments? Let me explain:
At the seed stage, investors aren’t modeling cash flows, they’re modeling outcomes.
Every check is underwritten using exit math to answer one question:
Can this investment return the fund?
Here’s how the math works.
1. Start with a target outcome
VCs begin by imagining a huge exit (often a $500M to $1B outcome).
They’re not expecting every company to get there, but they need to know it’s possible.
2. Target ownership
Investors back into initial ownership based on what ownership they want at exit (taking into account dilution from future rounds).
If a fund owns 10% of a company that sells for $500M, that stake is worth $50M.
On a $100M fund, that one investment could return half the fund.
If the company hits $1B, it could return the entire fund.
3. Dilution assumptions
Ownership doesn’t stay constant.
By Series C, early investors may be diluted 30-50%.
That 10% seed stake might shrink to 5-7% at exit. The exit has to be big enough to compensate for that.
4. Portfolio construction
Most funds assume only 1-2 companies will drive total fund returns.
Every seed bet must have the potential to return the fund on its own, even if most never will.
The takeaway:
VCs use exit math to decide whether a company could be one of the few that move the needle.
That’s the underwriting lens behind every seed check.