What Is a SAFE Note? How a VC Analyst Reads the Terms

A SAFE note is a contract where an investor wires money now and gets the right to receive shares later, usually at the next priced round. It carries no interest and no maturity date, and it is not debt. If you are asking what is a SAFE note from the investor side, the short answer is this: it is a delayed price. Everything that matters sits in two numbers, the valuation cap and the discount, and in how many SAFEs are already stacked on the cap table.

What a SAFE note actually is, without the legal gloss

Y Combinator introduced the Simple Agreement for Future Equity in 2013 as a lighter alternative to the convertible note, and it standardised on the post-money version in 2018 (YC's public SAFE documents). The investor gives cash. The company gives a promise of preferred stock on a future trigger.

That trigger is almost always a priced equity round. When the round closes, the SAFE converts automatically and ends. Until then the holder owns no shares, has no vote, and receives no dividend.

Two features separate it from a note. There is no interest accruing, so the amount converting is exactly the amount wired. There is also no maturity date, so nobody can call the money back and force a bridge conversation in month 18.

What the analyst actually does on a Tuesday is simple. Open the SAFE, find the cap, find the discount, check the form (pre-money or post-money), and write one line in the memo: "converts at X, dilutes Y%."

The valuation cap sets the ceiling on your entry price

The cap is the highest company valuation at which the SAFE converts. If the next round is priced above the cap, the SAFE holder still converts as if the company were worth the cap. That is the whole benefit of going early.

In a post-money SAFE, the cap includes all SAFEs and the new shares from the conversion itself. Ownership is therefore a clean division: investment divided by cap. A $500,000 SAFE on an $8M post-money cap buys 6.25% of the company before the priced round adds new money.

Carta's 2025 pre-seed data shows how central this instrument has become. US startups on its platform raised $10.4 billion across 50,316 SAFEs and convertible notes in the year, and the post-money, cap-only SAFE stayed the standard pre-seed form (Carta, State of Pre-Seed 2025). Median caps sat near $10M for rounds of $250K to $1M and near $15M for $1M to $2.5M.

Treat those medians as a reference line, not a verdict. A cap below the median for the round size is a signal to ask why. A cap far above it means you are buying a priced-round valuation with SAFE protections stripped out.

The discount is the second route to a lower price

The discount gives the holder a percentage off the price paid by new investors. A 20% discount on a Series A price of $1.00 per share converts at $0.80. Sources typically quote 20 to 30% as the usual range.

When a SAFE has both a cap and a discount, the holder takes whichever gives the lower conversion price. YC's standard template offers cap only, discount only, or neither (the MFN version), so a SAFE with both is already a negotiated document. Read it with a lawyer.

Our view: the cap matters more. A discount only bites when the next round is priced close to or below the cap. In a hot market the cap does the work, and the discount is decoration.

MFN SAFEs: when there is no price at all

A most-favoured-nation SAFE has neither a cap nor a discount. It adopts the best terms of any SAFE the company issues later. Founders sometimes use it for the first, smallest checks, when they cannot yet defend a valuation.

For the investor, an MFN is a bet on the next investor's judgment. Fine for a $25,000 angel cheque. Skip it as the lead instrument in a round where you are putting in real money and want a defined entry price.

Stacked SAFEs are where analysts lose the thread

Founders rarely raise one SAFE. They raise a $250,000 SAFE in March, a $750,000 SAFE in June on a higher cap, and a rolling tail of small cheques after that. Each one converts at its own cap.

Here is a worked case. A company issues $500,000 on an $8M post-money cap and $1,000,000 on a $12M post-money cap. The first converts into 6.25%. The second converts into 8.33%. Before the Series A investor puts in a dollar, the SAFE holders own 14.58%.

The founders do not feel that until the Series A term sheet arrives and the pro forma cap table shows them well below their expectation. Your job in diligence is to compute this number early, from the real SAFE stack, not from the founder's deck.

This is where a cap table tool earns its price. Carta and similar platforms model SAFE conversion scenarios, but you still need to verify the inputs against the signed documents.

Pre-money versus post-money: check which one you are holding

The older pre-money SAFE calculated ownership before counting other SAFEs. Each new SAFE therefore diluted earlier SAFE holders as well as the founders. The post-money version fixed this: a holder's percentage is set at signing and cannot be diluted by later SAFEs.

For the investor, the post-money form gives certainty on ownership. For the founder, it makes the cost of every additional SAFE explicit. That is a feature. It is also why early-stage funds now ask for post-money documents by default.

Always confirm the form on page one. A pre-money SAFE with a $10M cap and a post-money SAFE with a $10M cap are not the same deal, and mixing them in one spreadsheet produces quiet errors.

SAFE versus convertible note: what changes for the fund

A convertible note is debt. It accrues interest, usually 4 to 8%, and it matures on a date, typically 18 to 24 months out. If no priced round arrives by then, the holder can demand repayment or negotiate an extension.

The SAFE removes both pressures. That helps the founder. For the fund, it means you carry an instrument that may sit unconverted for years, with no interest to compensate you and no maturity to force a decision.

Neither instrument gives you control rights. Neither gives you a board seat, information rights, or pro rata, unless you negotiate a side letter. If your fund thesis depends on follow-on rights, ask for a pro rata side letter at signing. Asking in the Series A is too late.

What to put in the IC memo about a SAFE

Keep it to four lines. Instrument form and date. Cap and discount. Total SAFE stack outstanding, in dollars and in percentage ownership. Estimated post-conversion ownership at three Series A prices.

Then add the line most memos skip: what the SAFE does not give you. No governance rights, no liquidation preference until conversion, no protection if the company sells before a priced round. The SAFE's own terms cover a change of control, but they are narrower than most people assume.

Tools help with the sourcing side. Harmonic and Dealroom surface early-stage rounds, and Affinity logs the relationship, but none of them read a SAFE for you. The reading stays manual.

Four questions to ask the founder before you sign

First: how many SAFEs are outstanding, and at what caps? Ask for the signed copies, not a summary table. Founders forget the small ones, and the small ones still convert.

Second: is there a side letter with any other holder? A pro rata right granted to one angel changes the allocation you can expect in the Series A.

Third: what valuation does the founder expect in the next round, and why? If the answer sits far above the cap, the SAFE holders collect a large uplift, and the founders absorb the dilution. If the answer sits below the cap, the cap is irrelevant and the discount decides.

Fourth: what happens if the company never raises a priced round? Often the honest answer is "nothing", and the SAFE sits there. That is acceptable for a $50,000 angel position. It is a poor fit for a fund that must mark positions and report to LPs each quarter.

Limits of this guide

This is a reading framework, not legal advice. SAFE templates vary by jurisdiction, and European funds often face questions the US template does not answer: whether a SAFE is recognised under Swiss, German, or French company law, how it converts into local share classes, and who bears the notary cost. Several European founders use a local convertible loan or a bespoke instrument instead.

The Carta figures cover US startups only. Do not apply those medians to a Zurich or Paris pre-seed without a local comparable.

If you want to see how a screened deal looks once the SAFE stack is already modelled, request access and review a sample memo.