SAFEs and Convertible Notes

The valuation post noted early-stage valuation is hard and negotiated. This post covers the instruments that let companies raise without setting a valuation upfront: convertible notes and SAFEs (Simple Agreement for Future Equity). These are how a large share of pre-seed and seed rounds are done. This post explains what they are, why they exist, and the crucial terms — the valuation cap and the discount — that determine what early investors actually get.

The problem they solve

Pricing an early-stage company is genuinely hard (the valuation post): with little revenue and huge uncertainty, agreeing on a valuation is difficult, contentious, and somewhat arbitrary. It also involves legal complexity and cost to do a full priced equity round. For the earliest raises — small amounts, very early — this is disproportionate friction. The insight behind these instruments:

• Defer the valuation. Instead of agreeing on a valuation now, raise the money now and convert it into equity later — at the next priced round, when a real valuation gets set (by later, larger investors with more to evaluate). This sidesteps the hard early valuation question entirely: you don’t price the company today; you agree to price the early money relative to a future round.
• Move fast and cheap. These instruments are simpler, faster, and cheaper than a full priced equity round — less negotiation (no valuation to fight over), standard documents, lower legal cost. For early raises, that speed and simplicity is valuable; founders can raise from multiple investors quickly without a heavy process.

So convertible notes and SAFEs exist to let companies raise early money without pricing the company yet, deferring valuation to a later priced round and doing so quickly and cheaply. They convert into equity later. The two main instruments — convertible notes and SAFEs — implement this in slightly different ways.

Convertible notes and SAFEs

Both are ways to invest now and convert to equity later, with a key difference in their legal nature:

• Convertible note. A convertible note is technically debt — a loan to the company — that is designed to convert into equity at a future priced round (rather than being repaid in cash). Because it’s debt, it typically carries an interest rate (accruing until conversion, then usually converting along with the principal) and a maturity date (a deadline by which it should convert or, in principle, be repaid — which can create pressure if no priced round has happened by then). It converts to equity at the next round, usually on favorable terms (the cap/discount below).
• SAFE (Simple Agreement for Future Equity). A SAFE is not debt — it’s an agreement that the investor’s money will convert into equity at a future priced round, without being a loan. So it typically has no interest and no maturity date, making it simpler than a convertible note (no debt mechanics, no repayment deadline pressure). SAFEs were created to streamline early fundraising and are very widely used for early rounds today.

The practical difference: a convertible note is debt-with-conversion (interest, maturity — more complexity and some deadline pressure), while a SAFE is a simpler pure agreement-to-convert (no interest or maturity). Both achieve the same core purpose — raise now, price later, convert to equity at the next round — with the SAFE being the lighter-weight, increasingly-common instrument. What matters most for both, though, is on what terms the money converts, which comes down to the cap and the discount.

The valuation cap and the discount

If early investors’ money simply converted at the future round’s valuation, they’d get no reward for investing earlier (and riskier). So these instruments include terms that give early investors a better deal than the later investors — chiefly the valuation cap and the discount:

• Discount. The investor’s money converts at a discount to the price paid by the new investors in the priced round — e.g. a 20% discount means their money buys shares at 80% of the round’s price, so they get more shares per dollar. This rewards them for investing earlier. Straightforward: early money converts cheaper.
• Valuation cap. The cap sets a maximum valuation at which the investor’s money converts, regardless of how high the actual round valuation is. If the company raises its priced round at a valuation above the cap, the early investor still converts as if the valuation were the (lower) cap — so they get a better (larger) equity stake than the round price would give. The cap protects early investors from being diluted away by a high later valuation: it ensures their early risk is rewarded with meaningful ownership if the company does well.

   Cap illustration:
   SAFE with a $5M valuation cap. Later priced round happens at $20M.
   → the SAFE converts as if the valuation were $5M, not $20M
   → so the early investor's money buys ~4x more equity than at the round price
   (rewarding them for investing early, when it was riskier)

• Cap and discount together. Instruments often have both a cap and a discount, and the investor typically gets whichever gives them the better (more favorable) conversion. The cap matters most when the company grows a lot before the priced round (the cap becomes very valuable to the investor); the discount matters when the next round’s valuation is close to the cap.
• Why founders must understand these. The cap especially determines how much ownership early investors ultimately get. A low cap is good for investors (more of the company) and more dilutive to founders; a high cap is better for founders. So the cap is a key negotiation point — it’s effectively pricing the early money, just indirectly. And founders must track all their outstanding SAFEs/notes, because they’ll all convert at the next round and collectively dilute — sometimes surprisingly much if many were raised.

The cap and discount are what make these instruments a real deal (not just deferred pricing): they reward early investors for their earlier, riskier money by converting on better terms. For founders, the cap in particular is a crucial term that determines eventual dilution — understanding it is essential.

Watch-outs for founders

A few practical cautions when using SAFEs and convertible notes:

• Stacked SAFEs create hidden dilution. Because SAFEs are easy to raise, founders sometimes raise many over time — and forget that they all convert together at the next priced round, collectively causing substantial dilution that only becomes visible when the priced round happens. Model the combined conversion of all outstanding instruments so you’re not surprised by how much of the company they represent. This is one of the most common early-founder mistakes.
• The cap is the real price. Since the cap largely determines conversion, agreeing to caps that are too low (to close quickly) can cost far more ownership than it seems in the moment. Treat the cap with the seriousness of a valuation, because effectively it is one.
• Convertible-note maturity can bite. A convertible note’s maturity date is a real deadline — if no priced round has happened by then, technically the note is due, which can create pressure or force renegotiation. SAFEs avoid this (no maturity), which is part of why they’re popular.
• Conversion mechanics have details. Exactly how the cap and discount interact, what happens on different scenarios (a sale before conversion, etc.), and whether the cap is pre- or post-money vary by instrument. These details affect outcomes, so understanding (or getting advice on) the specific terms matters.

SAFEs and convertible notes let companies raise early money without setting a valuation yet — deferring pricing to a later priced round where the money converts to equity — with the SAFE being a simpler non-debt instrument and the convertible note being debt-with-conversion (interest, maturity). Their key terms, the valuation cap and discount, reward early investors and, especially the cap, determine founder dilution. Watch for stacked SAFEs’ combined dilution. Next: term sheets and the key terms of a priced round.

Key takeaways

• SAFEs and convertible notes solve the hard early-valuation problem by letting a company raise money now and defer setting a valuation until a later priced round, where the money converts to equity — faster, cheaper, and simpler than a full priced round, which is why they dominate pre-seed/seed.
• A convertible note is debt designed to convert to equity (so it has an interest rate and a maturity date — more complexity and deadline pressure), while a SAFE is not debt — a simpler agreement to convert with no interest or maturity — making SAFEs the lighter-weight, increasingly-common instrument.
• The discount lets early money convert at a percentage below the priced round’s price (more shares per dollar), and the valuation cap sets a maximum valuation at which the money converts regardless of the actual (higher) round valuation — both reward early investors for their earlier, riskier money, and instruments often include both (investor gets whichever is better).
• The cap especially determines how much ownership early investors ultimately get (a low cap is investor-favorable and more dilutive to founders), so it’s effectively the price of the early money and a key negotiation point — founders should treat it with the seriousness of a valuation.
• Key founder watch-outs: stacked SAFEs/notes all convert together at the next round and can cause surprisingly large combined dilution (model them together), convertible-note maturity dates are real deadlines, and conversion mechanics (cap/discount interaction, pre- vs post-money cap, sale scenarios) have details that materially affect outcomes.

Further reading

• Simple agreement for future equity — SAFE (Wikipedia)
• Convertible note (Wikipedia)
• Valuation (previous post)