SAFE notes are simple agreements for future equity with no interest or maturity date, making them founder-friendly. Convertible notes are debt instruments that accrue interest and must be repaid or converted by a maturity date, creating risk. The key decision factors are your tolerance for this maturity date risk and the preferences of your target investors.
Key takeaways
- Choose SAFEs for speed and simplicity; they are not debt and have no maturity date.
- Understand that a convertible note's maturity date is a major risk if you can't raise.
- Model every SAFE and note to understand true dilution from the valuation cap.
- Use the "post-money" SAFE to avoid surprise dilution from multiple funding rounds.
- Never sign any financing document without review from an experienced startup lawyer.
- Standardize on one instrument per round to keep your cap table clean.
Let's cut to the chase. A convertible note is debt . A SAFE is not.
This is the single most important distinction. Because it's debt, a convertible note has an interest rate and a maturity date . This means if you don't raise a priced round (a Series A) within a set period (usually 18-24 months), the investor can demand their money back, plus interest. For a cash-burning startup, this is a crisis.
A SAFE (Simple Agreement for Future Equity) has no interest rate and no maturity date. It can sit on your cap table forever, only converting to equity when you raise a priced round. It removes the ticking clock, which is an enormous advantage for a founder.
Y Combinator created the SAFE in 2013 to be a simple, fast, and founder-friendly alternative to convertible notes. Think of it as a warrant—a contract giving the investor the right to buy stock in a future financing round based on terms agreed upon today.
Valuation Cap: The most important term. This sets the maximum valuation at which the investor's money converts into equity. If you grant a SAFE with a $10M cap and later raise your Series A at a $20M valuation, the SAFE investor's money converts as if the valuation were only $10M. This rewards them for their early risk with a better price.
Discount: A secondary way to reward early investors. It gives them a percentage discount (e.g., 20%) off the Series A share price. If a SAFE has both a cap and a discount, the investor gets whichever term gives them a better price (more equity).
MFN (Most Favored Nation): An MFN clause, without a cap or discount, promises the investor that they will receive the best terms of any future SAFE you issue. It essentially kicks the can on setting a price, and is best used for very early, small checks from friends and family before you have a lead investor setting terms.
This is a non-obvious point that trips up many founders. The original SAFEs (pre-2018) were "pre-money" SAFEs. The current, standard YC documents are "post-money" SAFEs.
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Frequently asked questions
- What is a typical valuation cap for a pre-seed round?
- For a US-based pre-seed B2B software company, caps typically range from $8M to $15M. Earlier stage, pre-product companies will be at the lower end, while teams with strong traction or previous founder success can command the higher end.
- Does a SAFE note expire?
- No. A SAFE note has no maturity date or expiration. It remains in effect until a conversion event occurs (like a priced round or acquisition) or the company dissolves.
- What happens if a company is acquired before a priced round?
- Both SAFEs and convertible notes have provisions for this. Typically, the investor can choose to either convert their investment at the valuation cap and participate in the acquisition proceeds as a shareholder, or receive their original investment back (often 1x, sometimes more).
- Why do some investors still prefer convertible notes?
- Some traditional investors, family offices, or those less familiar with tech startup conventions prefer the downside protection of debt. As a creditor, they have a higher-ranking claim than SAFE holders if the company liquidates.
- Can I raise on multiple SAFEs with different caps?
- Yes, this is very common. You can raise from different investors at different times on SAFEs with unique valuation caps. This is a key benefit of using post-money SAFEs, as their math isolates each investment, preventing early investors from being diluted by later ones.
