SAFE (Simple Agreement for Future Equity)

A SAFE is the most common way early-stage startups raise money before they're ready for a full venture capital round. Created by Y Combinator in 2013, it replaced the convertible note as the default early-stage fundraising instrument in Silicon Valley and has since spread globally. The concept is elegantly simple: an investor gives you money today, and in return, they get the right to receive equity in the future when a specific trigger event occurs — usually a priced funding round.

Unlike a convertible note, a SAFE is not debt. There's no maturity date, no interest rate, and no obligation to repay the money. It sits on your balance sheet as a liability, but it doesn't accrue interest or come due on a specific date. When your next priced round happens, the SAFE converts into shares based on the terms you agreed to — typically a valuation cap, and sometimes a discount.

Y Combinator's current standard SAFE uses a post-money valuation cap, which means the investor knows exactly what percentage of the company they're buying at the time they invest. This was a major improvement over the original pre-money SAFE and convertible notes, where the investor's final ownership depended on how many other instruments converted alongside theirs. The post-money SAFE makes the math predictable for everyone.

If you're raising any amount of money from angels or pre-seed investors, you'll almost certainly encounter SAFEs. They're fast (a standard SAFE is 5 pages), cheap (minimal legal fees), and founder-friendly (no maturity date pressure). Understanding how SAFEs work — especially the difference between pre-money and post-money caps — is essential for knowing how much of your company you're giving away. Stacking multiple SAFEs at different caps can create surprising dilution when they all convert, so modeling your cap table with all outstanding SAFEs is critical before raising a priced round.