Convertible Notes vs. SAFEs: Which Should You Use?

Both instruments solve the same basic problem — raising money before you and investors can agree on what the company is actually worth — but they get there differently, and the difference matters more than most founders realize going in.

What They Have In Common

Neither a convertible note nor a SAFE prices the company at the time of investment. Instead, both convert into equity later — usually at your next priced round — often with a valuation cap (a ceiling on the price the investor converts at) and/or a discount (a percentage off the future round's price).

The Core Difference: Debt vs. Not-Debt

A convertible note is legally debt. It has an interest rate and a maturity date, meaning if the company hasn't raised a priced round or been acquired by that date, the note is technically due — which can create pressure or awkward conversations if a company takes longer than expected to hit its next round.

A SAFE (Simple Agreement for Future Equity) is not debt at all. No interest rate, no maturity date, no repayment obligation. It just sits there until a triggering event — typically a priced round — converts it into equity.

Why SAFEs Became The Default

Y Combinator introduced the SAFE specifically to simplify this process, and it's become the standard instrument for early-stage U.S. startups because it's faster to negotiate, cheaper in legal fees (often a single standardized document), and removes the maturity-date pressure that notes carry.

When A Convertible Note Still Makes Sense

Notes are more common outside the U.S., where SAFEs aren't always legally recognized the same way, or with investors who specifically want the protections debt affords — a maturity date gives them leverage to force a conversation if a company stalls indefinitely without ever raising again.

What To Actually Negotiate

Regardless of which instrument you use, the terms that matter most are the same:

• Valuation cap — the ceiling protecting early investors from over-diluting themselves if the company's value jumps a lot before the next round
• Discount rate — typically 10–20%, rewarding early investors for taking risk sooner
• Most Favored Nation (MFN) clause — ensures early investors get the best terms if later investors in the same round negotiate something better

The Practical Takeaway

If you're a U.S. startup raising a straightforward early round, a SAFE is very likely the right default — it's what most investors expect and what moves fastest. Reach for a convertible note only when there's a specific reason to, not out of habit.