Financing & funding

SAFE Note

Definition

A Simple Agreement for Future Equity — a Y Combinator-created instrument that gives investors the right to future equity without setting a valuation upfront. Unlike convertible notes, SAFEs carry no interest rate and no maturity date, making them the simplest early-stage funding instrument.

In depth
3 sections

What Is a SAFE Note?

A SAFE (Simple Agreement for Future Equity) is a financing instrument created by Y Combinator that gives investors the right to receive equity in a future priced round. Unlike a convertible note, a SAFE is not debt — it has no interest rate, no maturity date, and no repayment obligation. It is the most common instrument for pre-seed and seed-stage fundraising.

How a SAFE Converts to Equity

When a qualifying priced round occurs, the SAFE automatically converts into shares of preferred stock. The conversion price is determined by a valuation cap (maximum price per share) or a discount (percentage reduction from the round price) — whichever gives the SAFE holder more shares. Post-money SAFEs (the current Y Combinator standard) make it clear exactly what percentage of the company the SAFE holder will own at conversion.

SAFE vs. Convertible Note: Which Should You Use?

SAFEs are simpler, faster, and cheaper to execute. They are preferred for seed-stage raises under $2M where speed matters. Convertible notes offer investors more protections (interest, maturity enforcement) and are preferred when investors want debt-like downside protection. For founders seeking alternatives to equity entirely, consider non-dilutive funding.
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$500K+Last-year revenue
RecurringSubscription or repeat revenue
HealthyRetention & gross margins
Questions
SAFE Note

A post-money SAFE specifies the valuation cap as a post-money valuation — meaning it includes the SAFE investment itself. This makes ownership math clear: a $500K SAFE with a $5M post-money cap gives the investor exactly 10% at conversion ($500K / $5M). The Y Combinator standard SAFE is post-money.

There is no legal limit, but stacking multiple SAFEs compounds dilution quickly. Each SAFE converts at the next priced round, and founders often underestimate the cumulative ownership impact. Model total dilution from all outstanding SAFEs before issuing additional ones. Many advisors recommend keeping total SAFE capital under 15-20% of your expected next-round valuation.

SAFEs do not appear as equity on the cap table until they convert, but they should be tracked as potential dilution. Best practice is to maintain a pro-forma cap table showing both current ownership and the post-conversion scenario. This gives you and your investors a clear picture of what the cap table will look like after the next priced round triggers conversion.

A SAFE note is an agreement where an investor gives a startup cash today in exchange for the right to receive equity later, at a future priced round, instead of receiving equity or a fixed interest rate immediately. It behaves like a coupon for future stock rather than a loan or a purchase of shares — there is no set repayment date and no interest accruing in the meantime.

The two terms that determine how much equity a SAFE converts into are the valuation cap (the maximum company valuation used to price the conversion, protecting early investors if the company's value rises sharply) and the discount rate(a percentage off the priced round's per-share price). Also check whether the SAFE is pre-money or post-money— post-money SAFEs are the Y Combinator standard and make the investor's resulting ownership percentage explicit up front.

SAFEs are deliberately cheap and fast because they use Y Combinator's free, standardized templates rather than custom-negotiated legal documents. Most founders spend little to nothing on legal fees for a straightforward SAFE — often just an hour or two of attorney review, versus the thousands of dollars a priced equity round or a heavily negotiated convertible note can cost. That simplicity is the main reason SAFEs dominate pre-seed and seed-stage fundraising.

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