# What Is a SAFE Note? Caps, Dilution and Terms in 2026 URL: https://aistartupinsights.com/journal/what-is-a-safe-note Type: blog Locale: en Published: 2026-10-12 Updated: 2026-10-13 --- > A SAFE note converts cash into future equity with no interest or maturity. Here is how caps, discounts and stacking set your dilution, with 2026 market data. What is a SAFE note? It is a Simple Agreement for Future Equity: a contract in which an investor wires cash today and receives shares later, when the startup raises a priced round. It carries no interest and no maturity date, so it is not debt. In Q2 2026, 93% of pre-seed rounds on Carta were structured as SAFEs. For an AI founder, it is now the default instrument. ## What a SAFE note is, and what it is not Y Combinator introduced the SAFE in 2013 to replace the convertible note for very young companies. The legal mechanics are short. The investor pays a purchase amount. The company promises the investor stock if a future equity financing happens. Until then, the investor holds a contract, not shares, and has no vote. Three properties explain the adoption curve: - **No interest.** Nothing accrues, so the investor's stake does not grow with time. - **No maturity date.** Nobody can call the money back on day 366. - **One short document.** Per [Y Combinator's own description](https://www.ycombinator.com/safe), the valuation cap is usually the only term left to negotiate. The delta against a convertible note is structural. A note is a loan that converts. A SAFE is a right to equity that never was a loan. That distinction removes repayment risk from the cap table conversation, which is why seed investors accept it at pre-seed check sizes. ![Hand-drawn grid on paper showing ownership slices next to a calculator](https://fdzlnqpwsaniezitwiuw.supabase.co/storage/v1/object/public/cms-media/aistartupinsights/2026-10/07dc0e-i1.webp) ## The three variables that set what a SAFE converts into A SAFE converts when the company closes a priced equity round, usually a seed or Series A. Conversion price depends on three terms. - **Valuation cap.** Sets the maximum valuation at which the SAFE converts. A lower cap means more dilution for founders. - **Discount.** Converts at a set percentage below the new round's price. 20% is the common figure. - **MFN (most favored nation).** No cap and no discount; the SAFE takes the best terms of any later SAFE, which pushes pricing decisions to later investors. The valuation cap does most of the work. On a post-money SAFE, ownership sold equals the investment divided by the cap. Y Combinator's example runs it backwards: raise $1M and target 15% ownership sold, and your post-money cap is about $6.7M. Carta supplies the cleaner worked case. A fund invests $1M on a SAFE with a $10M cap, and it receives at least 10% when the priced round arrives. If the round values the company at $100M, the fund still gets 10%. If the round values it at $5M, the cap is moot and the SAFE converts at the lower price, which yields 20%. [Carta's Q2 2026 SAFE data](https://carta.com/data/safe-valuation-caps-q2-2026/) confirms the same arithmetic. ## Post-money versus pre-money: why the market settled on one Y Combinator standardized on the post-money SAFE in 2018. The difference is who absorbs dilution from other SAFEs. On a pre-money SAFE, later SAFEs dilute earlier SAFE holders alongside the founders, so an investor cannot compute final ownership at signing. On a post-money SAFE, the cap already includes every SAFE issued, so the investor's percentage is locked on the day they sign. Founders absorb all the dilution from later SAFEs. The market voted. In Q2 2026, 91% of SAFEs on Carta were post-money. Among post-money SAFEs in the first half of 2026, 94% carried a valuation cap. In 73% of cases the cap was the only price mechanism, and another 21% had both a cap and a discount. Read that as a signal: the "cap only" SAFE is the standard document. A discount layered on top is a negotiation concession, not a norm. ## How SAFE terms are moving for AI startups Caps are rising. On SAFEs larger than $2.5M, the median cap reached $35M in Q2 2026, up 40% year over year, according to Carta. The 75th percentile approached $60M. At the top of the market, 90th percentile caps ran 2.5x to 3.5x above the median across the past six quarters, depending on SAFE size. Two readings are worth holding at once. - **Founders get more room.** A higher cap means less ownership sold per dollar raised. - **Investors are pricing in growth.** A cap is typically set at a small premium to current value, so a $35M median cap implies the market expects those companies to clear it at the next round. For AI-native companies, the pressure points are compute and hiring. A model-heavy startup burns cash earlier than a SaaS shell, so the gap between SAFE close and priced round shrinks. A shorter gap makes the cap choice more consequential, because there is less time to grow into it. To benchmark a cap against comparable rounds, you need a deal database. PitchBook is the incumbent for round-level valuation and investor data, though the subscription is priced for funds rather than first-time founders. ## What stacking SAFEs does to your cap table The failure mode is not one SAFE. It is five. Each SAFE is cheap to sign, so founders sign several with different caps and lose track of cumulative dilution. WilmerHale's April 2026 analysis of post-money SAFEs gives a stacked example. Four SAFEs with different caps add up as follows. - **$400,000 at an $8.0M cap:** 5.00% sold, 5.00% cumulative. - **$725,000 at an $11.5M cap:** 6.30% sold, 11.30% cumulative. - **$1,200,000 at a $16.0M cap:** 7.50% sold, 18.80% cumulative. - **$2,000,000 at a $32.0M cap:** 6.25% sold, 25.05% cumulative. Total raised: $4.325M. Total ownership committed before the priced round's new money: just over 25%. And that is before the option pool top-up that most Series A leads request, and before the new investors' own stake. ![Whiteboard sketch of ascending bars representing growing ownership stakes](https://fdzlnqpwsaniezitwiuw.supabase.co/storage/v1/object/public/cms-media/aistartupinsights/2026-10/64e03d-i3.webp) The practical rule: keep a running ledger of every SAFE, its cap, its discount and its side letters. Do the post-money math after each signature, not at the term sheet stage. Investor-side, a CRM such as Affinity can hold the relationship and instrument history for deals you track. ## SAFE note versus convertible note: where each still wins SAFEs are not universal. Convertible notes retain two features that matter in specific deals. - **Legal nature.** A SAFE is a contract for future equity. A convertible note is debt that converts. - **Interest and maturity.** A SAFE has neither. A note accrues interest, usually converts into shares, and carries a maturity date that creates a repayment trigger. - **Negotiated terms.** A SAFE usually negotiates the cap alone. A note negotiates cap, discount, rate, maturity and covenants. - **Pre-seed share (Carta, Q2 2026).** SAFEs account for 93% of rounds. Notes are a small and shrinking fraction. Notes still make sense when a lender or a non-US investor requires a debt instrument, or when a bridge round needs a maturity forcing function. If you are comparing both instruments for a specific raise, the earlier piece in this series on convertible notes versus SAFEs walks through the decision. For the standard US pre-seed check from angels or a seed fund, the SAFE wins on speed and legal cost. For anything with a lender involved, read the note. ## Executing a SAFE: the five steps The paperwork is short, but sequence matters. - **Pick the raise size, then derive the cap.** Fix the dilution you accept, then back into the cap with the YC formula. - **Choose the variant.** Cap only is the default. Add a discount only if an investor insists. - **Close lower-cap SAFEs first.** Y Combinator's guidance on MFN SAFEs is explicit: wire the lower-cap SAFEs before you issue an uncapped MFN, because the MFN takes the best terms of any later SAFE. - **Sign and store.** Use e-signature software and file the executed copy against the investor record. DocuSign is the common option, and most investors already have an account. - **Update the cap table the same day.** Model the post-money conversion at three hypothetical Series A valuations. ![Hand signing an agreement at a white desk](https://fdzlnqpwsaniezitwiuw.supabase.co/storage/v1/object/public/cms-media/aistartupinsights/2026-10/6c287f-i2.webp) Have counsel review the final form even though the template is standard. A SAFE is a security, and securities rules apply to who you can sell it to. ## Where SAFEs go wrong Three patterns recur. **Raising too much on uncapped paper.** An MFN or a high cap with no floor feels generous at signing. At conversion, the founder can discover that the lead investor wants a larger option pool and a lower effective price, and the stacked SAFEs convert on top. **Mixing pre-money and post-money SAFEs.** Older documents and new documents calculate dilution differently. If your cap table contains both, model each separately. **Ignoring the conversion trigger.** A post-money SAFE needs no minimum raise to convert, per Y Combinator. Any qualifying equity financing converts the SAFE, which can surprise founders who planned a small bridge priced round. ## Verdict: should you issue a SAFE? If you are raising under $2.5M from angels or a seed fund and you want speed, issue a post-money, cap-only SAFE and set the cap from a target dilution, not from a headline valuation. Carta's data shows that is what 73% of post-money SAFEs look like. Skip the SAFE if a lender, a corporate partner or a non-US investor needs a debt instrument. Skip stacking more than three SAFEs before a priced round without modeling the cumulative stake. The delta that matters is not the cap on one document. It is the sum of every cap you have signed, set against the round you plan to raise next. This article is general information, not legal or investment advice; have a qualified attorney review any instrument before you sign. ## FAQ ### What is a SAFE note in simple terms? A SAFE (Simple Agreement for Future Equity) is a contract where an investor gives a startup money now in exchange for the right to receive shares in a future priced round. It is not debt, and it has no interest or maturity date. ### Is a SAFE note debt? No. Y Combinator describes the SAFE as not a debt and not a loan. It accrues no interest, has no maturity date, and is not stock until it converts into preferred shares in an equity financing. ### What is a valuation cap on a SAFE? The valuation cap is the highest valuation at which the SAFE converts. On a post-money SAFE, ownership sold equals the investment divided by the cap, so a $1M investment at a $10M cap gives the investor at least 10%. ### What is the difference between a pre-money and post-money SAFE? On a post-money SAFE, the cap includes all SAFEs issued, so the investor's ownership is fixed at signing and founders absorb later dilution. On a pre-money SAFE, later SAFEs also dilute earlier SAFE holders. YC standardized on post-money in 2018. ### How common are SAFE notes in 2026? According to Carta, 93% of pre-seed rounds in Q2 2026 were structured as SAFEs, and 91% of SAFEs on the platform were post-money. Convertible notes are a small and shrinking share. ### Do SAFE notes have a discount? They can. In the first half of 2026, 73% of post-money SAFEs on Carta used a valuation cap only, and 21% included both a cap and a discount. A discount is typically around 20% below the new round's price. ### What happens to a SAFE note when a company is acquired or shuts down? A SAFE has liquidity and dissolution provisions. On a valuation cap SAFE, the investor receives the greater of 1x the purchase amount or the amount it would receive had the SAFE converted to common stock. Have counsel review the exact form.