SAFE vs Convertible Note: Which to Use for Pre-Seed
Ninety-three percent of pre-priced pre-seed deals on Carta used a SAFE in Q4 2025 — only 7% used a convertible note (Carta, 2026). If you're raising your first round, the instrument question is mostly settled. But "mostly" isn't "always," and picking the wrong one still costs founders real equity and legal fees. So which one fits your raise? The answer comes down to a handful of clauses, and this guide walks through each.
TL;DR: For most pre-seed rounds, use a post-money SAFE — it's faster, cheaper, and now the market standard at 93% of pre-priced deals (Carta, 2026). Choose a convertible note only when an investor demands interest and a maturity date, or in sectors like biotech and hardware where notes remain common.
What Is the Difference Between a SAFE and a Convertible Note?
A SAFE is an equity instrument; a convertible note is debt. That single distinction drives everything else. A SAFE has no interest rate and no maturity date, while a convertible note accrues interest (typically 2–8%) and must convert or be repaid by a set date. Both delay setting a valuation until a later priced round.
Historically, the convertible note came first. The SAFE — Simple Agreement for Future Equity — was created by Y Combinator in 2013 to strip out the debt mechanics founders kept tripping over: the interest, the repayment clock, and the awkward conversation when a note matured before the next raise. In other words, the SAFE is the note with the sharp edges filed off.
According to Carta, SAFEs accounted for 64% of all seed rounds in 2025, versus 27% for priced equity and just 10% for convertible notes (Carta, 2026). Still, the note isn't dead — instead, it's specialized. It survives mostly in biotech, hardware, and deals where a specific investor insists on debt protection.
For the full picture of how early rounds work, see our startup fundraising guide from pre-seed to Series A.
How Does a SAFE Actually Work?
A SAFE converts your investor's money into equity at a future priced round, using terms locked in today. There's no loan, no interest, and no deadline — the investor simply holds the right to shares when you next raise a priced round, get acquired, or IPO. Until then, nothing happens on a schedule.
Two terms define the conversion. First, the valuation cap sets the maximum company valuation at which the money converts, protecting the early investor's upside. Second, the discount gives them a percentage off the next round's share price. However, most modern SAFEs use a cap alone, often with no discount at all.
The standardization runs deep. By Q3 2024, 87% of all SAFEs were post-money, up from 43% at the start of the decade (Carta, 2025). When Y Combinator switched its templates to the post-money version, the rest of the market followed quickly. That uniformity is itself an advantage: investors recognize the document on sight, so there's little left to negotiate beyond the cap.
How Does a Convertible Note Differ in Practice?
A convertible note works like a SAFE with two extra clauses bolted on: an interest rate and a maturity date. Because it's structured as debt, the investment accrues interest — usually 2–8% annually — which then converts into additional shares at the next round. Meanwhile, the maturity date, often 18–24 months out, sets a hard deadline by which the note must convert or be repaid.
Those two clauses are the whole story. Moreover, they hand the investor an edge that a SAFE doesn't: if you stall and never raise a priced round, the note can come due, forcing conversion at the cap or, in rare cases, repayment. As a result, some angels still prefer notes precisely because they carry that backstop.
According to Carta's 2025 data, convertible notes now cluster in biotech, energy, and medical devices — capital-intensive fields with long timelines where investors want a defined conversion event (Carta, 2026). For a software pre-seed, though, that protection is usually friction without benefit.
Why Do Founders Choose SAFEs Over Convertible Notes?
SAFEs win on speed, cost, and simplicity — the three things that matter most when you're raising small and moving fast. For instance, a standard YC SAFE runs a few pages, is often signed without a lawyer, and carries no interest or deadline. A convertible note, by contrast, needs more negotiation: the rate, the term, and what happens at maturity all have to be agreed.
There's a subtler reason too. Because the post-money SAFE is so standardized, both sides skip the line-by-line review that debt documents invite. Consequently, deals close in days rather than weeks. For a founder juggling product and a raise at the same time, that saved time is the real prize.
The hidden cost founders miss: Post-money SAFEs are simpler to model but worse for founder dilution than the old pre-money version. "Post-money" means the cap is measured after all SAFEs convert — so every additional SAFE you stack dilutes you, not the earlier investors. Stack five $10M-cap SAFEs and your real giveaway is larger than any single cap suggests. Always model the aggregate before you sign, not each note in isolation.
To see how that dilution compounds across rounds, read our startup equity dilution guide.
When Does a Convertible Note Still Make Sense?
A convertible note makes sense when an investor wants debt-holder protection or when your sector treats notes as the norm. Specifically, the interest and maturity date give the investor a backstop: if you never raise a priced round, the note can come due, converting at the cap or demanding repayment. Consequently, for certain angels that safety net is simply the price of writing a check.
Specifically, convertible notes still dominate in biotech, energy, and medical devices — capital-intensive fields with long timelines where investors want a defined conversion event (Carta, 2026). For a software pre-seed, however, that protection is usually unnecessary. For a hardware startup raising from a traditional angel, on the other hand, it may simply be expected.
The maturity date is the clause that bites hardest. A note with an 18-month term that matures before your seed round forces an awkward renegotiation — which is exactly the scenario the SAFE was designed to eliminate. Therefore, if you do sign a note, negotiate a term long enough to comfortably outlast your runway.
How Do Valuation Caps and Discounts Work in Both?
Caps and discounts work identically in SAFEs and convertible notes — they're the terms that actually decide your price. The valuation cap sets the maximum valuation at which your money converts to equity, while the discount gives early investors a percentage off the next round's price. Most modern deals use a cap, frequently without any discount.
In 2025, median post-money SAFE caps sat around $10 million for rounds of $250K–$1M and $15 million for rounds of $1M–$2.5M (Carta, 2025). Notably, these same numbers anchor convertible-note caps too — the instrument changes, but the pricing logic does not.
Here's the part founders underestimate: the cap, not the instrument, determines most of your dilution. Whether you sign a SAFE or a note, a $10M cap on a $500K raise converts roughly the same way. Obsessing over SAFE-versus-note while ignoring the cap is optimizing the wrong variable entirely. For how caps translate into round-by-round valuations, see our startup valuation by funding round guide.
What Mistakes Do Founders Make With These Instruments?
The most expensive mistake is stacking multiple SAFEs at different caps without modeling the combined dilution. Each SAFE looks small on its own, yet together they can hand over far more equity than a founder expects when the priced round finally arrives. The cap table, in short, surprises people who never did the aggregate math.
What we see on the platform: Founders raising their first round on StartuPage almost universally use SAFEs now — the convertible note shows up mainly when a single legacy angel insists on it. In our experience, the friction is no longer the instrument; it's founders signing several SAFEs at different caps over six months, then discovering at the seed round that their combined giveaway is 25–30%, not the 15% they pictured.
Three other mistakes recur. First, accepting a discount and a low cap, which double-dips on dilution. Second, signing a convertible note with a maturity date shorter than the runway, setting up a forced renegotiation. Third, copying a cap from a friend's deal without checking whether the stage and traction match. Each is avoidable with ten minutes of modeling.
What Should You Actually Use for Your Pre-Seed?
For a standard software pre-seed in 2026, use a post-money SAFE with a valuation cap and no discount — it's the path 93% of founders now take (Carta, 2026). Start from the YC template, model your aggregate dilution before stacking multiple SAFEs, and reach for a convertible note only when an investor requires it or your sector expects it.
The decision tree is short. Raising a software pre-seed from modern angels or a fund? Use a SAFE. Facing an investor who demands interest and a maturity date? Use a note, or walk. Building in biotech or hardware? Expect notes and price the protection into your plan. Above all, set the cap deliberately, because that number — more than the instrument — shapes how much of your company you keep.
Frequently Asked Questions
Is a SAFE better than a convertible note?
For most early-stage software startups, yes. SAFEs are simpler, carry no interest or maturity date, and now make up 93% of pre-priced pre-seed deals (Carta, 2026). Convertible notes remain useful in capital-intensive sectors or when an investor demands debt protection.
Do SAFEs have a valuation cap?
Most do. The standard 2025 structure is a post-money SAFE with a valuation cap and no discount. Median caps were around $10M for $250K–$1M rounds and $15M for $1M–$2.5M rounds (Carta, 2025).
What happens to a convertible note if you never raise again?
The maturity date triggers. The note either converts at its cap or becomes repayable debt, depending on the terms. This deadline is the main risk SAFEs avoid, since they have no maturity date and simply wait for a priced round to convert.
Can you mix SAFEs and convertible notes in one round?
Yes, though it complicates your cap table. Each instrument converts under its own terms, so stacking different caps and structures makes modeling dilution harder. Keep instruments consistent where possible, and always model the aggregate conversion before signing.
How much equity does a pre-seed SAFE typically cost a founder?
It depends entirely on the cap and the amount raised, not the instrument. A $500K raise on a $10M post-money cap converts to roughly 5% — but stacking several SAFEs multiplies that. Model the combined effect with our equity dilution guide.
The Bottom Line
The SAFE-versus-note debate is largely decided: for a standard pre-seed, the post-money SAFE is faster, cheaper, and what investors expect. The real work isn't choosing the instrument — it's setting a sensible valuation cap and modeling how multiple SAFEs dilute you together.
- Default to a post-money SAFE for software pre-seed rounds
- Watch the cap, not just the instrument — it drives most of your dilution
- Model aggregate dilution before stacking multiple SAFEs
- Use a convertible note only when an investor or sector requires it
Ready to plan your raise? Start with our pre-seed to Series A fundraising guide, then model your giveaway with the equity dilution guide.
