What is SAFE?
A SAFE (Simple Agreement for Future Equity) is a short funding contract where an investor provides capital now in exchange for the right to receive equity in a future priced financing round, at terms fixed today.
Also known as: Simple Agreement for Future Equity · SAFE note · post-money SAFE
In plain terms
A SAFE defers the hard question — what is the company worth? — until a later priced round. The investor gives money today and receives shares later at a discount or a capped valuation.
It is standard in early-stage venture funding because it is fast: a few pages, no valuation negotiation, no maturity date or interest.
How it works
The two key terms are the valuation cap (the maximum price the investor will pay for shares in the future round) and the discount (a percentage off that round's price). Whichever gives the better price applies.
When the company raises a priced round, the SAFE converts into shares at the cap-or-discount price. If the company is acquired before converting, the SAFE's terms also define the payout.
Post-money SAFE formats make ownership math explicit: the investor's percentage is calculated against the post-money valuation, including all outstanding SAFEs.
Example
Hypothetical: an investor puts $200,000 into a SAFE with a $10,000,000 post-money cap. A year later the company raises at a $25,000,000 valuation; the SAFE converts at the $10,000,000 cap, so the investor receives shares equal to 2% of the company rather than 0.8%.
Why it matters for founders and investors
For founders, SAFEs are fast capital but stack up: several uncapped or high-cap SAFEs can quietly transfer significant ownership before a priced round.
For investors, the cap is the whole deal — a high cap with no discount barely rewards early risk, so terms should be read against the company's realistic next-round valuation.
Common misconceptions
A SAFE is not debt: there is no obligation to repay and no interest. If no priced round ever happens, the SAFE may convert on other events or become worthless — read the terms.
Conversion is not guaranteed at the cap in every scenario; side letters, most-favored-nation clauses and later SAFEs can change the outcome.
Frequently asked questions
What is the difference between a SAFE and a convertible note?
A convertible note is debt with interest and a maturity date; a SAFE is not debt and has neither. SAFEs are simpler but offer the investor fewer protections if the company stalls.
What does post-money mean on a SAFE?
It means the ownership percentage is calculated after counting all outstanding SAFEs, making each investor's stake predictable. Older pre-money SAFEs diluted each other in ways that were hard to calculate.