Y Combinator created the SAFE (Simple Agreement for Future Equity) in 2013 because convertible notes were too complicated for the speed at which early-stage startups need to raise money. A decade later, the SAFE has become the default fundraising instrument for pre-seed and seed-stage startups in the US. If you’re raising your first round, you’ll almost certainly encounter one. Here’s what you need to know.
How a SAFE Works
An investor gives you money. You give them a SAFE. That’s not equity — it’s a promise that the investor will get equity later when a triggering event happens (usually your next priced funding round). No interest accrues. There’s no maturity date. There’s no loan to repay. The investor is simply buying the right to future equity at favorable terms. When you raise a priced round, the SAFE converts into shares at a price determined by the SAFE’s terms.
The Four Types of SAFEs
Y Combinator published standardized SAFE templates in four configurations. Valuation cap, no discount: The SAFE converts at the lower of the cap or the round price. Most common for pre-seed. Discount, no cap: The SAFE gets a percentage discount (typically 15-25%) on the next round’s price. Less common. Valuation cap and discount: The investor gets whichever produces the lower conversion price. Most investor-favorable. MFN (Most Favored Nation), no cap or discount: If you issue a later SAFE with better terms, this one automatically upgrades to match. Used when neither party can agree on a cap.
Post-Money vs Pre-Money SAFEs
This is where most founders get confused. Y Combinator updated the SAFE in 2018 from pre-money to post-money. The difference is huge. A pre-money SAFE with a $10M cap means you’re worth $10M before the SAFE money — so total dilution depends on how much you raise. A post-money SAFE with a $10M cap means the investor’s ownership is calculated on $10M including their investment. The post-money version is cleaner because investors know exactly what percentage they’re buying. If you invest $1M on a $10M post-money cap, you get exactly 10%. No ambiguity. Most SAFEs in 2026 are post-money.
The Hidden Danger: Stacking SAFEs
The biggest mistake founders make with SAFEs is raising too much on them without understanding cumulative dilution. Because SAFEs have no maturity date and don’t show up as equity on the cap table until conversion, it’s easy to keep issuing them. Then your priced round arrives, all the SAFEs convert simultaneously, and founders realize they’ve given away 40-50% of the company before the Series A investors even get their share. Every SAFE you issue should be modeled on a pro forma cap table showing the expected dilution at conversion.
SAFE vs Convertible Note vs Priced Round
SAFE: Simplest, cheapest, fastest to close. No interest, no maturity. Best for pre-seed and seed when you’re moving quickly. Convertible note: Debt with interest and maturity date. Preferred by investors outside Silicon Valley and in markets where debt protections are expected. Priced round: Actual equity sale at a set valuation. More complex, requires a lead investor, and involves legal costs ($10K-50K). Best when you have leverage and want a clean cap table. Most startups use SAFEs for the first $500K-$2M, then switch to priced rounds for Series A.
The Verdict
SAFEs are the best instrument for raising early-stage capital quickly and cheaply. Use the standard YC post-money SAFE template. Don’t reinvent the wheel with custom terms — investors are familiar with the standard template and non-standard SAFEs slow down the process. Keep total SAFE dilution under 20-25% before your priced round. And build a pro forma cap table showing what conversion looks like before you sign anything.
Frequently Asked Questions
Is a SAFE the same as equity? No. A SAFE is a promise of future equity. You don’t give up shares until the SAFE converts at a triggering event (typically a priced funding round).
What’s a typical SAFE valuation cap in 2026? Pre-seed caps range from $3-8M for most startups. Seed-stage caps range from $8-20M depending on traction, market, and team. Top-tier founders from known companies or repeat founders may see higher caps.
Can I raise on SAFEs outside the US? SAFEs are primarily a US instrument. Other countries may not have the same legal framework. In India, Europe, and other markets, convertible notes or equivalent local instruments may be more appropriate.
Do investors prefer SAFEs or convertible notes? In Silicon Valley and among YC-network investors, SAFEs are standard. Traditional investors, especially outside tech hubs, often prefer convertible notes because of the debt protections.
Where can I get the standard SAFE template? Y Combinator publishes free, standardized SAFE templates on their website (ycombinator.com/documents). Use these templates rather than drafting custom documents.
