A SAFE valuation cap is a term used to calculate how a Simple Agreement for Future Equity converts when a later financing occurs. It is not necessarily the startup’s current valuation, and it does not by itself guarantee a final ownership percentage.
Y Combinator publishes current SAFE documents and guidance. Parties should use the exact signed form, because pre-money and post-money SAFEs calculate economics differently.
What a SAFE is
A SAFE is a contract that can convert into equity after a trigger such as an equity financing. It is not debt in the same way as a convertible note: the standard form does not carry interest or a maturity date.
The investor pays now and receives shares later under the contract’s conversion terms.
What the cap does
The valuation cap creates a ceiling used in the conversion-price calculation. If the priced round valuation is above the cap, the SAFE can convert at a lower effective price than the new-money investors, subject to the form’s definitions.
The cap rewards an early investor for taking risk before the priced round. It is a calculation input, not a statement that the board or market has valued the company at that number today.
Post-money versus pre-money
YC’s post-money SAFE was designed to make the ownership sold through SAFEs more transparent before the next priced round. The form defines company capitalization and SAFE conversion carefully.
Older pre-money SAFEs can produce different dilution results because multiple convertibles and the option pool interact with the pre-money capitalization.
Do not compare two caps without confirming the form version and whether it is pre-money or post-money.
A simple illustration
Suppose an investor pays $500,000 on a post-money SAFE with a $10 million valuation cap. A rough headline division suggests 5% before later-round dilution, but the actual shares depend on the signed form, capitalization definitions, other SAFEs, option pool changes and the priced round.
The arithmetic in a cap-table model should follow the contract. A shortcut is useful for orientation, not for closing documents.
What can dilute the investor
After conversion, ownership can be diluted by:
- new shares sold in the priced round;
- an expanded employee option pool;
- later financing;
- other securities and warrants;
- grants or acquisitions paid in stock.
“Post-money” does not mean “protected from all future dilution.”
Cap versus discount
Some SAFEs use a valuation cap, a discount, or terms that apply whichever produces the more favourable conversion price under the contract. Read the exact language.
A lower cap can improve conversion economics for the SAFE holder but increases potential founder and common-stock dilution. The headline cap cannot be evaluated without the amount raised on SAFEs.
Questions for the cap table
Before signing or modelling, ask:
- Which SAFE form and revision is being used?
- Is it pre-money or post-money?
- How much has already been raised on SAFEs?
- Are there MFN or discount terms?
- How is company capitalization defined?
- Is an option-pool increase expected before the round?
- What happens in a liquidity or dissolution event?
Founders should model all outstanding SAFEs together. Investors should model conversion and the next round, not only the cap.
This explainer is educational and not legal, tax or investment advice. The signed document controls.
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