Post-money vs pre-money SAFEs, valuation caps, MFN, discount rates, dilution math, and how to raise your first check without a lawyer chewing up your runway.
SAFE (Simple Agreement for Future Equity) is the standard early-stage fundraising instrument in 2026. Y Combinator invented it in 2013 and re-issued the "post-money SAFE" in 2018, which is what almost every US pre-seed and seed round now uses. If you are raising your first check in San Francisco, you will almost certainly use a SAFE. Here is what actually matters.
What is a SAFE note?
A SAFE is a contract between a founder and an investor. The investor gives you money now. In exchange, they get the right to shares in your company later, when a priced round happens (Series A or Seed priced). No interest, no maturity date, no debt.
It is not technically a note (that would be a convertible note, which is debt). YC called it a "SAFE" instead of "SAFT" or "convertible" specifically to avoid the debt framing. Most founders and investors say "SAFE note" anyway; it is fine.
Post-money SAFE vs pre-money SAFE
Post-money SAFE (the 2018 standard, what YC ships today):
- The valuation cap includes all SAFE money raised in the round.
- Dilution is predictable: investors know exactly what percentage they will own when the SAFE converts.
- Founders get diluted more predictably (and slightly more per dollar) than under the old pre-money SAFE.
Pre-money SAFE (the 2013 original, mostly gone in 2026):
- The valuation cap did not include other SAFE money.
- Founders could stack SAFEs and the ownership math got messy at Series A.
In 2026, use the post-money SAFE. It is what YC, every serious pre-seed fund, and every experienced angel expects. Download the templates at ycombinator.com/documents.
The 4 SAFE variants
YC ships 4 versions of the post-money SAFE:
1. Valuation cap, no discount. Most common. Investor converts at the lower of the cap or the priced-round valuation.
2. Discount, no valuation cap. Investor gets a discount (typically 10 to 20 percent) off the priced round. Less common; founders often prefer this if they expect a high Series A.
3. Valuation cap and discount. Investor gets whichever is more favorable. Rare in 2026 -- most investors accept cap-only.
4. MFN (Most Favored Nation), no cap and no discount. Investor gets the best terms of any future SAFE issued before the priced round. YC's own $375k additional check uses this.
Valuation caps in 2026
Typical pre-seed valuation caps for SF founders as of July 2026:
- Solo founder, pre-product: $6M to $10M cap
- Solid team, working prototype: $10M to $15M cap
- YC-batch companies: $15M to $25M cap (YC brand premium)
- Repeat founders or hot AI thesis: $20M to $40M cap
- Frothy AI seed (ex-OpenAI, ex-Anthropic, etc.): $30M to $80M cap
Cap is not price. If your cap is $10M and you raise $500k on SAFEs, then Series A prices at $20M, the SAFE holders convert at the $10M cap -- they get twice the shares of Series A investors per dollar. That is their upside for taking early risk.
How much do founders raise on SAFEs?
Typical 2026 SF pre-seed rounds:
- Small angel round: $150k to $500k across 5 to 15 SAFEs
- YC + follow-on: $500k YC deal + $500k to $2M from angels and pre-seed funds on SAFEs
- Institutional pre-seed: $1M to $4M on SAFEs, often with one lead pre-seed fund setting the cap
Full active investor list with check sizes: Investor directory.
The dilution math
Rough rule of thumb (post-money SAFE, $10M cap):
- Raise $500k -> ~5 percent dilution
- Raise $1M -> ~10 percent dilution
- Raise $2M -> ~20 percent dilution
A typical founder team should aim to hold 60 to 70 percent of the cap table after seed round. Anything below 50 percent post-Series A signals a fundraising problem to future investors.
SAFE vs convertible note
| Feature | SAFE | Convertible Note |
|---|---|---|
| Debt or equity | Not debt, contract for future equity | Debt |
| Interest | None | 2 to 8 percent typical |
| Maturity date | None | 12 to 36 months |
| Payback required if no priced round | No | Yes (in theory) |
| Legal complexity | Low (5-page YC template) | Higher |
| 2026 usage | ~90 percent of SF pre-seed rounds | ~5 percent |
Convertible notes are still occasionally used when investors want interest, in specific European jurisdictions, or when a founder needs the maturity-date structure. For 99 percent of US pre-seed rounds in 2026, use a SAFE.
How to actually raise on SAFEs
1. Incorporate. Delaware C-Corp with 10M authorized shares. See Getting Your Startup Legally Set Up.
2. Decide your cap and target raise. Pick a cap that matches your traction (see bands above). Pick a total raise that funds 18 months.
3. Download the YC post-money SAFE template. ycombinator.com/documents. Do not have a lawyer draft a custom SAFE for a $500k round -- it wastes money and slows the raise.
4. Send SAFEs to each investor. Fill in name, amount, and cap. Sign electronically (Docusign, PandaDoc, or the tool of your choice).
5. Investor wires funds. Usually within 5 to 15 business days.
6. File 83(b) elections and update your cap table. Use Carta, Pulley, or AngelList for cap-table tracking.
Most first-time SF founders close $500k to $1M on SAFEs in 4 to 8 weeks.
Common mistakes
- Stacking too many SAFEs at different caps. Messy at Series A. Try to run one round with one cap.
- Using pre-money SAFEs in 2026. Signals inexperience. Use post-money.
- Setting a cap much higher than traction. Investors will pass or ask for MFN. Better to raise less at a fair cap than raise nothing at a fantasy cap.
- Skipping the 83(b) election. You will owe tax on unvested founder stock as it vests, at potentially very high valuations. File within 30 days of stock issuance.
- Hiring a lawyer to draft custom SAFE terms. For pre-seed, the YC template is the standard. Use it as-is.
Frequently asked
What is a SAFE note? A SAFE (Simple Agreement for Future Equity) is a contract where an investor gives a startup money now in exchange for the right to shares later, when a priced round happens. It is not debt, has no interest, no maturity date, and is the standard 2026 US pre-seed fundraising instrument.
What is a YC SAFE? Y Combinator's standard SAFE template. In 2018, YC re-issued it as the "post-money SAFE," which is what nearly every US pre-seed and seed round uses in 2026. Free templates at ycombinator.com/documents.
Post-money vs pre-money SAFE, which should I use? Use post-money. It is the 2026 standard. Pre-money SAFEs create messy cap-table math when multiple SAFEs stack, and experienced investors expect post-money.
What is a fair valuation cap for a pre-seed SAFE in 2026? In San Francisco: $6M to $10M for solo founders pre-product, $10M to $15M for a team with a working prototype, $15M to $25M for YC companies, and $20M to $40M for repeat founders or hot AI teams.
SAFE note vs convertible note? A SAFE is a contract for future equity with no interest and no maturity date. A convertible note is debt with interest (2 to 8 percent) and a maturity date (12 to 36 months). In 2026, roughly 90 percent of US pre-seed rounds use SAFEs.
Related guides
Last updated July 2026. Valuation cap bands sourced from Carta, AngelList, and JustMoveToSF investor directory data. Not legal advice; consult a startup attorney before signing.