SAFE vs Convertible Note: Understanding the Key Differences in Startup Financing

 When raising early-stage capital, startups often choose between two popular instruments: the SAFE (Simple Agreement for Future Equity) and the Convertible Note. Both serve a similar purpose—allowing investors to fund startups in exchange for future equity—but they differ in structure, terms, and implications for both founders and investors.

In this article, we’ll break down what each instrument is, how they work, and the key differences that matter when deciding which to use.


What is a SAFE?

A SAFE is a relatively new type of financing instrument introduced by Y Combinator in 2013. It allows investors to invest money in a startup in exchange for the right to receive equity at a later date—typically when the startup raises its next priced round.

Key Features of a SAFE:

  • No interest or maturity date

  • Converts into equity at a future valuation event

  • Often includes a valuation cap and/or discount

  • Designed to be simple and founder-friendly


What is a Convertible Note?

A Convertible Note is a debt instrument that converts into equity in the future, usually during a subsequent financing round.

Key Features of a Convertible Note:

  • Debt instrument with interest rate

  • Has a maturity date—the date by which it must convert or be repaid

  • Can include valuation caps and discounts

  • Typically used when both investors and founders want more structured terms


Key Differences Between SAFE and Convertible Notes

FeatureSAFEConvertible Note
Legal StructureEquity-like agreementDebt instrument
Interest RateNoneTypically 2–8% annually
Maturity DateNo maturity dateHas a fixed maturity date
Repayment ObligationNo repayment requiredMust be repaid if it doesn’t convert
SimplicityVery simple and quick to executeSlightly more complex; legal review required
Risk to FoundersLower legal risk due to no debt obligationsHigher risk if the note matures before conversion
Investor AppealMay be less favorable without maturityMay offer more protection with interest/maturity

When to Use a SAFE

  • You want to close funding quickly and avoid the complications of a debt instrument.

  • You’re confident in raising a priced round soon, triggering the conversion.

  • You prefer a founder-friendly instrument with minimal obligations.


When to Use a Convertible Note

  • Investors want legal protection and interest accrual.

  • You’re unsure about the timing of your next round and want to provide a maturity date.

  • Your startup is pre-revenue or high-risk, and investors seek stronger terms.


Conclusion

Choosing between a SAFE and a Convertible Note depends on your startup’s needs, investor expectations, and risk appetite. SAFEs offer a fast, flexible way to raise early capital with less legal overhead, making them ideal for many seed-stage startups. Convertible Notes, while more complex, provide structured protections that some investors prefer.

As always, consult legal and financial advisors to determine which instrument best suits your specific situation.


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