A SAFE (Simple Agreement for Future Equity) is an investment instrument created by Y Combinator that allows investors to provide capital now in exchange for equity later, when a priced round occurs. Unlike convertible notes, SAFEs have no interest rate and no maturity date. The key terms are valuation cap (maximum conversion price), discount (percentage reduction on future round price), and MFN (most favored nation) provisions. Post-money SAFEs are the current standard.
SAFEs are the default instrument for pre-seed and seed rounds. They let you take money quickly without setting a valuation or negotiating complex terms.
Created by Y Combinator in 2013, SAFEs replaced convertible notes for most early-stage deals because they have no interest rate, no maturity date, and are simpler to execute.
Valuation cap: maximum valuation at which the SAFE converts to equity. Protects the investor if your valuation increases significantly.
Discount: percentage reduction on the price per share at conversion (typically 10-20%).
MFN (Most Favored Nation): ensures the investor gets the best terms you offer to later SAFE investors.
Pro rata rights: right to invest in future rounds to maintain ownership percentage.
Post-money SAFEs (YC standard since 2018) set the cap on post-money valuation, making dilution clearer for both sides. Your ownership is straightforward: Investment / Post-money cap.
Pre-money SAFEs calculate conversion based on pre-money valuation. Multiple pre-money SAFEs at different caps create complex cap table math because they dilute each other.
Post-money SAFE: $500k investment, $5M cap. Investor owns 10% ($500k / $5M) at conversion, regardless of how many other SAFEs are outstanding.
If you later raise a Series A at $10M pre-money, the SAFE converts at the $5M cap, giving the investor twice the shares they would get at the Series A price.
Raising too much on SAFEs without tracking total dilution. Multiple SAFEs at different caps can surprise founders when they all convert.
Not understanding post-money vs pre-money mechanics. With post-money SAFEs, each new SAFE dilutes founders, not previous SAFE holders.
Treating SAFEs as free money. They are deferred equity, and the dilution is real when they convert.
Ask slide: state instrument type (SAFE), cap, and amount raising. Example: "Raising $1M on post-money SAFEs at $8M cap."
Each SAFE holder gets a fixed ownership %. Founders absorb all dilution.
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