Convertible Notes and SAFEs for DTC Founders: A Plain-English Guide Before You Sign

If you raise money for a DTC brand today, the first paper you will be handed is almost certainly a SAFE or a convertible note. They look simple. A founder signs one in an afternoon, takes the check, and moves on. The problem is that the bill does not arrive until your priced round, sometimes a year or two later, and by then the dilution is locked in and non-negotiable.

This guide makes you fluent before you sign. We will cover how each instrument actually works, the cap and discount mechanics that set your conversion price, the interest and maturity that make a note more expensive than a SAFE, and the stacking trap that quietly dilutes founders who raise on several SAFEs in a row. There is a worked conversion example so you can see the real numbers, not just the vocabulary.

SAFE vs convertible note: the one distinction that matters

Both instruments defer pricing. You take cash now, and the investor gets equity later, at your next priced round, on terms set today. That is the shared idea. The single distinction you must internalize is this: a SAFE is not debt; a convertible note is debt.

Because a SAFE is not debt, it has no interest and no maturity date. There is no clock and no repayment obligation. It just sits there until a priced round, an acquisition, or an IPO triggers conversion. The SAFE was invented by Y Combinator in 2013 for exactly this simplicity, as our glossary on what a SAFE is lays out.

A convertible note is a loan. It accrues interest, commonly 4 to 8 percent simple per year, and it has a maturity date, commonly 18 to 24 months and sometimes stretching to 36 (sources: Promise Legal, CRV). That interest is not paid in cash; it converts into equity on top of the principal. The maturity matters too: if no priced round happens before the note comes due, it can technically be called for repayment, a pressure a SAFE never creates.

That single distinction ripples into almost every other term. Here is the side-by-side, so you can see exactly where the two instruments diverge before you sign either one.

Read across the last two rows and you have the whole story. The conversion mechanics are identical. The difference is that a note carries a clock and a meter, and both of them quietly raise the price you pay in equity when the round finally prices.

Caps and discounts: how your conversion price is set

Both instruments use two levers to decide how cheaply the investor's money converts into shares.

• Valuation cap. The maximum valuation at which the money converts. A lower cap means the investor gets more equity for the same dollars. This is usually the lever that matters most.
• Discount. A percentage off the next round's price, typically 15 to 25 percent. So if your next round prices at $20M and the discount is 20 percent, the SAFE holder converts as if the valuation were $16M.

When a deal has both a cap and a discount, you do not get to pick the friendlier one for yourself. The investor converts at whichever gives them more shares, which is whichever price is lower. In a strong up round the cap usually wins; in a flat or down round the discount can win. Either way, model both.

A quick way to feel this: say your SAFE has an $8M cap and a 20 percent discount, and your next round prices at $20M. The discount path values the investor's money as if the company were worth $16M (20 percent off $20M). The cap path values it at $8M. The investor converts at $8M because it is the lower number and hands them more shares. The discount did nothing here; the cap carried the entire conversion. Now flip it: if the next round prices at only $9M, the discount path gives $7.2M and the cap path gives $8M, so the discount wins and the cap is the dead term. The point is not to memorize which lever fires when. It is to run both numbers every time, because the one you ignore is occasionally the one that bites.

Post-money vs pre-money SAFE

This is the detail that trips up founders who learned the SAFE a few years ago.

A post-money SAFE, the 2018 update and current default, sets the cap as a post-money valuation. The investor's ownership percentage is effectively locked in at signing, and your dilution is explicit: roughly the amount invested divided by the post-money cap. Cleaner math, fewer surprises.

A pre-money SAFE, the original 2013 form, set the cap pre-money. Your final dilution depended on how big the next round turned out to be, so you could not know your exact give-up until the round priced. It is largely deprecated, but you will still see it occasionally. If someone hands you a pre-money SAFE, that alone is worth a question.

The worked example: one SAFE, a stack, and a note

Here is where the abstraction becomes a real number. Take a $5M revenue DTC brand raising on an $8M post-money cap.

• One $500K SAFE. Dilution is roughly $500K divided by the $8M cap, or 6.25 percent. Feels small. Easy yes.
• A stacked $1.5M SAFE round. You liked how easy the first one was, so you sign three $500K SAFEs over a few months. They all convert at the same $8M cap. Now it is $1.5M divided by $8M, or 18.75 percent. Same instrument, triple the dilution, and you may not have felt it accumulate.
• A $1.5M convertible note at 7 percent interest over 18 months. The principal is $1.5M, but 7 percent simple over 1.5 years adds $157,500 of interest that also converts. So $1,657,500 converts against the $8M cap, or 20.72 percent. The note costs you about two extra points of equity versus the same dollars on SAFEs, purely from interest.

The point of the chart is not the exact heights. It is the shape: the instrument you signed without thinking, repeated three times, became nearly a fifth of your company, and the debt version cost even more.

The stacking trap, and how debt and equity actually compare here

The stacking trap is the most common SAFE mistake I see. Each SAFE is small enough to sign without modeling, so founders treat them as one-offs. But they do not convert one at a time; they all convert together at the priced round into a single dilution figure. A $1.5M stack at a $5M cap is 30 percent gone before your new investor even buys a share. As the SAFE glossary puts it, always model the cumulative conversion before signing the next note.

I worked with a supplements founder who had signed four SAFEs over about ten months: two at $500K and two at $250K, for $1.5M raised. Each one felt like a quick yes between bigger fires, and nobody added them up because they landed on different caps in different months. When we finally laid all four on one page and converted them at the priced round, the cumulative give-up came to just under 24 percent of the company. She had been telling new investors she expected to dilute "maybe 15 percent" from the SAFE round. The 9-point gap was not a math error in any single document; it was the absence of a single document that held all four at once.

A skincare brand I advised hit the same wall from the note side. They raised $1.2M on a convertible note at 8 percent because the lead investor preferred debt, then took twenty months to reach a priced round. Twenty months of 8 percent simple interest on $1.2M is $160,000 of accrued interest that converted into equity right alongside the principal. At their $7M cap, the principal alone was 17.1 percent; with the interest stacked on, conversion landed at 19.4 percent. The founder described the extra 2.3 points as "rent I paid for taking too long to raise the next round," which is exactly the right way to think about a note's maturity clock.

The lesson in both stories is the same: the danger is never the single instrument you are looking at. It is the running total you are not. Model the whole stack as if everything converts at the same round on the same day, because that is what actually happens.

To make the note's clock concrete, here is the same $1.5M principal at a 7 percent rate and an $8M cap, with only the maturity changing. A SAFE never moves off 18.75 percent because it carries no interest. A note climbs with every month it stays outstanding.

This is also why the SAFE-or-note question is really a debt-versus-equity question in disguise. A SAFE is future equity with no carrying cost. A note is debt that becomes equity, with interest stacked on top and a maturity clock running. If you are weighing how to fund growth at all, our guide to debt vs equity financing walks through when each makes sense for a scaling brand, and where these convertible instruments sit between the two. For an inventory-heavy DTC brand, revenue-based financing is often the cheaper third path, and our decision matrix across equity, debt, and revenue-based financing lays out when to reach for each.

What to do about it

1. Write down the cap and discount on every instrument you hold. One line each. You cannot model a stack you have not listed.
2. Compute each conversion two ways. Cap price and discount price. Assume the investor takes the lower one. That is the realistic dilution.
3. Model the cumulative stack, not the next SAFE in isolation. Add up every outstanding SAFE and note as if they all convert at the same round. That single percentage is your real give-up.
4. Treat a note's interest as dilution, not a footnote. Add accrued interest to principal before you divide by the cap. On longer maturities it moves the number.
5. Default to a post-money SAFE unless there is a reason not to. It gives you a clear ownership number at signing instead of a surprise at the round.
6. Set a cap you can live with at a great outcome. A low cap raises money fast and dilutes you hard if you succeed. Decide what ownership you need to keep on the other side, then back into the cap.
7. Get the full stack reviewed before you sign number two. The cheapest time to catch over-dilution is before the second check, not at the priced round.

If you want to go deeper on the instrument itself before you sign, our glossary on what a SAFE is walks through the cap, discount, and conversion math one more time, and our guide to debt vs equity financing helps you decide whether a convertible instrument is even the right way to fund this stage of the brand. One thing to settle before you sign anything: these instruments convert into corporate stock, so if you are still operating as a pass-through, read up on how your LLC or S-corp election affects the picture first.

Methodology

Instrument mechanics, interest ranges (4 to 8 percent), maturity ranges (12 to 36 months, commonly 18 to 24), and discount ranges (15 to 25 percent) reflect 2025-2026 market norms compiled via Perplexity research across legal and venture sources, including Promise Legal and CRV, and cross-checked against the Eightx SAFE glossary. The worked example assumes a $5M revenue DTC brand, an $8M post-money cap, post-money SAFE mechanics, and a convertible note at 7 percent simple interest over 18 months. Dilution figures are amount converting divided by the post-money cap. These are illustrative; your cap, discount, round timing, and option pool will change the exact numbers.

Frequently Asked Questions