SAFE & Convertible Note Review for Pre-Seed Startups
A plain-English guide to the terms that matter most in a SAFE or convertible note, and how to avoid the cap-table surprises that catch pre-seed founders off guard. Educational, not legal advice.
Educational guide · Last reviewed July 31, 2026
By Dontay Phillips, Founder & Principal Attorney, ClearScope Counsel
SAFEs and convertible notes exist to let founders raise money quickly without agreeing on a company valuation up front. That speed is the whole appeal at pre-seed — but every term you accept in a SAFE or note gets resolved later, usually at your next priced round, on terms you negotiated today under time pressure and without a lawyer in the room.
SAFEs and notes are fast and cheap compared to a priced equity round. What you give up is precision: the dilution math doesn't finish until conversion, which means small differences in cap, discount, or MFN language compound in ways that aren't obvious at signing.
SAFE vs. convertible note, in plain terms
Both instruments delay the valuation conversation, but they're legally different, and that difference matters if things don't go as planned.
| Feature | SAFE | Convertible note |
|---|---|---|
| Legal form | Not debt, not equity until conversion | A debt instrument |
| Interest | None | Typically accrues interest |
| Maturity date | None, in most modern forms | Has a maturity or repayment date |
| Conversion trigger | A priced equity round, plus other negotiated triggers | A priced round, maturity, or a negotiated trigger |
| Typical use | Pre-seed and seed, especially YC-style rounds | Pre-seed, seed, and bridge financing |
The terms that actually move your dilution
Valuation cap
The maximum valuation at which the instrument converts to equity, regardless of what your next round is priced at. A lower cap means the SAFE holder converts into more equity per dollar invested — it's the single biggest lever in the document.
Discount rate
A percentage discount off the price your next-round investors pay, applied instead of (or alongside) the cap depending on which produces a better result for the holder.
Most-favored-nation (MFN) clause
Gives the holder the right to swap in better terms if you offer a more favorable cap or discount to a later investor. It sounds minor and rarely is — it can quietly reset every earlier SAFE's terms.
Pro-rata rights
The right to invest in a future round to maintain the holder's ownership percentage. Not dilution math by itself, but it affects how much room is left in your next round for new investors.
“If we raise our next round above the cap, what percentage of the company do these SAFEs actually convert into, combined?”
The stacking problem
Most pre-seed companies raise on more than one SAFE, often at different caps and discounts as the round comes together over months. Each instrument looks manageable in isolation. Stacked together, they can convert into a much larger combined slice of the company than any single conversation with an investor implied. Modeling the full cap table before signing another SAFE, not after, is what catches this early.
What to have reviewed before you sign
- The valuation cap, and how it compares to your most recent raise or informal valuation conversations.
- The discount rate and how it interacts with the cap.
- The scope of any MFN clause, and which earlier SAFEs it could reach back and reprice.
- Pro-rata rights and how much future round capacity they commit.
- Conversion mechanics on acquisition or dissolution, not just a future priced round.
- Any side letter terms negotiated outside the main document.
Frequently asked questions
No. A SAFE is a contractual right to receive equity in the future, not equity itself at signing. It only converts into actual shares when a triggering event, usually a priced round, occurs.
Most modern SAFEs don't carry either, which is one of the main differences from a convertible note, where both are typically standard terms.
It sets the maximum valuation at which the SAFE converts to equity, which protects early money from being diluted if your company's valuation rises sharply before the next priced round.
The base document is usually a standardized template, but the cap, discount rate, MFN scope, and any side letter are all negotiable.
There's no fixed number, but every additional SAFE compounds future dilution, so modeling the full cap table before adding another one is worth the review before you sign.
Primary sources and further reading: Y Combinator's SAFE documents and the National Venture Capital Association's model financing documents.
Get your SAFEs reviewed before the next round.
Flat-fee review of your SAFE or convertible note stack: cap, discount, MFN scope, and what it actually means for your cap table at conversion.