SAFE Note

A Simple Agreement for Future Equity — a startup financing instrument created by Y Combinator that gives investors the right to receive equity at a future priced round, without interest, debt mechanics, or a maturity date.

A SAFE (Simple Agreement for Future Equity) is a financing instrument created by Y Combinator in 2013 as a simpler alternative to convertible notes. Like a convertible note, a SAFE gives an investor the right to receive equity at a future priced round — but unlike a convertible note, a SAFE is not debt. It has no interest rate, no maturity date, and no obligation to repay. It's a contract that says: 'give us money now, and when we raise a priced round, you'll receive equity at a defined price.' SAFEs are now the dominant seed-stage financing instrument in US venture capital, used for the majority of early-stage rounds.

The original SAFE had a single key variable: the valuation cap (a ceiling on the conversion price, protecting early investors if the company's valuation surges). Y Combinator later introduced a post-money SAFE — now the standard version — which more explicitly defines investor ownership percentage at conversion. A post-money SAFE with a $10M cap means the investor owns a calculable percentage of the company based on their investment divided by $10M, which converts to that percentage (or better) at the next priced round. This makes the dilution math more transparent than old-style SAFEs or convertible notes, but also means SAFE investors directly dilute founders and early employees from the moment of investment.

For startup employees, the SAFE stack matters enormously for understanding how much of the company they actually own. A startup that has raised $3M in SAFEs at a $10M cap before raising a Series A at $30M pre-money is carrying a large SAFE overhang. When those SAFEs convert, they'll convert at the $10M cap price — producing far more shares than $3M at the Series A price would have created. All those shares come from existing equity holders. Employees who received options or stock before the SAFE conversion will see their percentage ownership drop significantly. The actual dollar value may still increase if the company is growing, but dilution from SAFEs is often larger and more opaque than employees realize.

Employees at SAFE-stage startups (typically seed to pre-Series-A) should ask several questions when evaluating an equity offer: How much has been raised in SAFEs? What are the valuation caps? Has any SAFE financing been raised at a post-money cap (which means more predictable but immediate dilution) or pre-money cap (which converts less predictably)? What will the cap table look like after the SAFEs convert at the anticipated Series A valuation? A recruiter or founder who can't answer these questions clearly is either uninformed or not being transparent — both are worth noting.