How a SAFE Works: A Plain-English Guide

How a SAFE Works (and Your First Term Sheet), in Plain English

The SAFE is the most-signed and least-understood document in early-stage fundraising. Founders sign one because an investor hands it over and it looks short and friendly. Then, a year later, they find out that a couple of numbers on page one quietly determined how much of the company they gave away. That’s a fixable problem. The instrument isn’t complicated once you see what each piece is doing.

So here’s the goal for this piece. By the end, you should be able to read a SAFE and understand, in plain terms, what you’re agreeing to. You should also recognize the handful of term-sheet clauses that actually move the needle when a priced round finally arrives. This is general information, not advice about your specific raise, and the exact economics always depend on your numbers.

What is a SAFE, and what isn’t it?

SAFE stands for Simple Agreement for Future Equity. The mechanic is right there in the name: an investor gives you money now in exchange for the right to get equity later, usually when you raise your next priced round. It is not a loan. A classic SAFE has no interest rate and no maturity date, so there’s no debt sitting on your books waiting to come due. That’s the main reason founders like it: money in, no immediate dilution to calculate, no repayment clock.

The catch is that “equity later” hides the important question: how much equity, and at what price. A SAFE doesn’t set a price today. It sets the rules for the price the investor will get when conversion happens. Those rules are the whole game. And they live in two terms: the cap and the discount.

Because a SAFE assumes you’ll convert it into stock, it also assumes you’re (or will become) a corporation. If you’re still an LLC, that’s a mismatch worth sorting out early. I get into why in the entity-choice guide.

Cap, discount, or both?

The valuation cap is the maximum company valuation at which the investor’s money converts into stock, regardless of how high your next round is priced. Say an investor puts in on a $10M cap and you later raise at a $30M valuation. The SAFE investor converts as if the company were worth $10M, so their dollars buy roughly three times the stock a new investor’s dollars buy at that round. The cap rewards them for showing up early. For you, a lower cap means you give away more of the company for the same check.

The discount is simpler: it gives the SAFE investor a percentage off the price of the next round (commonly in the range of 10–20%). If the round prices at $1.00 a share and the discount is 20%, the SAFE converts at $0.80.

Many SAFEs have both a cap and a discount, and the standard language lets the investor take whichever gives them the better price, not both stacked together. A SAFE can also have neither; an uncapped, undiscounted SAFE just converts at the next round’s price, which is the founder-friendliest version and, unsurprisingly, the rarest.

What about MFN, and the fine print that travels?

You’ll often see MFN, short for “most favored nation.” It means that if you later issue another SAFE on better terms, the earlier investor can elect to take those better terms too. It exists to stop you from quietly giving the next person a sweeter deal. It’s common and usually reasonable; the thing to watch is simply that generous terms you offer anyone can ripple backward to everyone with an MFN clause. Every SAFE you sign is a little bit of a precedent.

Two more distinctions worth knowing. SAFEs come in pre-money and post-money versions, and the post-money version — now the more common standard — calculates the investor’s ownership in a way that’s more predictable for them and, in practice, tends to be somewhat more dilutive to founders across a stack of SAFEs. And “pro rata” language, if present, gives the investor the right to put more money in later to maintain their percentage. None of these are traps exactly; they’re just terms with consequences, and you should know which ones you signed.

Dilution, intuitively

Here’s the intuition that keeps founders out of trouble: every SAFE is dilution you’ve already agreed to. You just haven’t felt it yet. The stock doesn’t get issued until the next round, so it’s easy to sell several SAFEs and lose track of how much of the company you’ve committed. When they all convert at once, alongside the new money and a fresh option pool, the founders’ combined percentage can drop more than anyone eyeballed.

The fix isn’t complicated: keep a running model of what your cap table looks like after every outstanding SAFE converts, not just what it looks like today. If you can’t see the post-money picture, you don’t actually know what you’re giving away. This is exactly the kind of ongoing question a fractional general counsel is built to field before you sign, rather than after.

Which term-sheet clauses actually matter?

Eventually the SAFEs convert and you negotiate a real priced round with a term sheet. Term sheets are longer, but a small number of clauses do most of the work:

• Valuation (pre-money) and option pool. The headline number, and the size of the option pool carved out before the money goes in, because a bigger pre-money pool dilutes you, not the new investor. These two travel together; read them together.
• Liquidation preference. Who gets paid first, and how much, if the company is sold. A plain “1x non-participating” preference is standard and founder-reasonable. “Participating” preferences and multiples above 1x can quietly reshape who gets what in an exit.
• Board composition. Who controls the board seats. This is control, not economics, and it matters more over time than most first-time founders expect.
• Protective provisions. The list of decisions that require investor consent. Normal in moderation; worth reading so you know what you can and can’t do without a sign-off.
• Anti-dilution. What happens to earlier investors if you later raise at a lower price. “Broad-based weighted average” is the common, moderate form.

If you learn to read just those, you understand most of what a seed term sheet is doing.

The takeaway

A SAFE is a simple document that makes one non-simple promise: equity later, on rules you set now. Learn the four words that matter: cap, discount, MFN, post-money. Model the dilution before you sign, and you’ve handled the part that trips founders up. When the priced round comes, focus your attention on valuation-plus-pool, liquidation preference, and board control, and you’ll be negotiating the terms that matter instead of the ones that don’t. If you’d like a second set of eyes before you sign a SAFE or a term sheet, that’s a good moment to bring one in.

This article is general information, not legal or tax advice, and reading it does not create an attorney-client relationship. Your specific facts matter; confirm current requirements with the relevant authorities or your own advisor. Law Office of Ian Daily.