What's the difference between a SAFE and a convertible note for raising an early-stage startup round?

Both SAFEs (Simple Agreement for Future Equity) and convertible notes are popular ways for early-stage startups to raise capital without having to set a company valuation immediately. While they serve similar purposes, they function differently under the law and in their terms.

Here is the breakdown of the primary differences:

1. Legal Structure

• Convertible Note: This is a debt instrument. It is a formal loan that carries an interest rate and a maturity date. Because it is debt, it technically sits on the company's balance sheet as a liability that must be repaid if it doesn't convert into equity.
• SAFE: This is a contractual right to future equity. It is not debt, does not accrue interest, and has no maturity date. It was created by Y Combinator to simplify the investment process by removing the legal complexities of a loan.

2. Maturity and Repayment

• Convertible Note: These have a "maturity date" (usually 18–24 months). If the startup hasn't raised a priced equity round by that date, the investors have the legal right to demand their money back, force a conversion into equity, or negotiate an extension.
• SAFE: Because there is no maturity date, there is no "deadline" for the company to raise a priced round. This takes significant pressure off the founders, as they aren't obligated to repay the investment if a future round takes longer than expected to materialize.

3. Interest

• Convertible Note: These accrue interest over time. When the note converts, the investor typically gets their principal plus the accrued interest converted into shares, which can lead to more dilution for the founders.
• SAFE: SAFEs do not accrue interest. The investor gets exactly what they invested, adjusted for any valuation cap or discount.

4. Investor Rights

• Convertible Note: As creditors, note holders have certain rights associated with debt holders, and in a worst-case scenario (like a bankruptcy), they may have priority over equity holders for repayment.
• SAFE: SAFE holders are essentially at the bottom of the capital structure. They are not creditors, so they don’t have the same legal protections or repayment rights that a lender would have.

Summary Table

Which to choose? Founders often prefer SAFEs because they are simpler, faster, and don't carry the risk of a maturity date "default." However, some investors—particularly those who prefer the security of debt or the interest accrual—may still insist on a convertible note.

Note: This information is for educational purposes and does not constitute legal or financial advice. Always consult with a qualified attorney before signing investment agreements, as laws and standard practices can vary significantly by jurisdiction.