SAFE Note Math: When the Cap Actually Beats the Discount

A valuation cap sets a maximum price at which the SAFE converts, regardless of what your next priced round actually values the company at. A discount instead sets a percentage off whatever price the next round sets, moving with the round's actual valuation rather than fixing a ceiling. When a SAFE includes both, the conversion price is whichever of the two produces a lower price for the investor, since a lower conversion price means more shares for the same investment.

Conversion price equals the lower of the cap price and the round price multiplied by one minus the discount percentage. If your next round prices well above the cap, the cap price is lower than the discounted round price, so the cap binds. If the round prices closer to or below the cap, the discounted round price can end up lower than the cap, so the discount binds instead. Run both sides of that comparison against your actual expected next round price rather than assuming the cap always wins just because it was the number everyone focused on when the SAFE was signed.

To find the binding term, work through it in this order:

1. Work out the cap price implied by the SAFE's valuation cap, which is the maximum price at which the SAFE can convert.
2. Take the next round's price and multiply it by one minus the discount percentage to get the discounted round price.
3. Compare the two numbers, because the SAFE converts at whichever is lower, since that gives the investor more shares.
4. If the round prices well above the cap, expect the cap to bind. If it prices near or below the cap, expect the discount to matter more.

Say a SAFE has a cap and a twenty percent discount, and your next round eventually prices well above that cap. The cap price is lower than the discounted round price in that scenario, so the cap binds, and the investor converts as if the company were valued at the cap regardless of the round's actual higher price. Now say the round instead prices much closer to the cap. Take twenty percent off that round price and compare it to the cap price directly; if the discounted number comes out lower, the discount binds instead, giving the investor a conversion price even below the cap. Whoever negotiated the SAFE's discount rate cares most in exactly this middle scenario, since it's the one where the discount actually does the work instead of just sitting unused behind the cap.

A post-money SAFE cap sets the investor's ownership percentage directly, since the cap is defined as valuation after the SAFE itself is included, which makes dilution math cleaner for the investor but means the founder bears all the dilution from any other SAFEs issued afterward. A pre-money cap, more common in older SAFE templates, doesn't fix the investor's final ownership percentage the same way, since later SAFEs and the round itself all affect the resulting math differently. Know which structure you're signing, since the difference changes how much of the cap's implied dilution is actually locked in at signing versus determined later by what else you raise.

When several SAFEs with different caps convert at the same priced round, each one converts independently at its own formula, its own cap compared against its own discounted round price, which means investors with lower caps end up with proportionally more shares for the same dollar invested than investors who came in later at a higher cap. Model the combined dilution from every outstanding SAFE together before a round closes, not just the highest or lowest cap in isolation, since the total dilution across a stack of differently capped SAFEs is often larger than founders expect when they only glance at the most recent one.

Conversion order matters too when the SAFEs are structured as post-money and their total implied ownership approaches or exceeds what the actual round is trying to price. Work through the full stack with your attorney or a fractional CFO before finalizing the round's price, since discovering a stacking problem after term sheet signatures are already in hand is a much harder conversation to have with your new lead investor.