A convertible note is a loan that converts into equity in a future financing; a SAFE (Simple Agreement for Future Equity) gives an investor a contractual right to future equity without being debt. Both usually convert at a discount or valuation cap in the company’s next priced round, but a note carries interest and a maturity date, while a SAFE carries neither. That difference drives most of the other trade-offs.
Founders raising a first round often ask the same question: convertible notes or SAFEs? Both avoid negotiating a valuation now, both are faster and cheaper than a priced round, and both can create surprising dilution if you don’t model them. This post compares the two side by side. For a deeper look at each instrument, see our posts on how SAFE notes work and convertible debt.
Convertible Notes in Brief
A convertible note is debt. The investor lends money, the note accrues interest, and the principal plus accrued interest usually converts into the shares sold in a “qualified financing,” typically a priced round that raises at least a minimum amount defined in the note.
Notes also have a maturity date. The maturity date is not a statutory requirement; it is a contractual term that sets a deadline for conversion and defines what happens if no qualified financing occurs in time. Depending on the note, the holder may be able to demand repayment, convert at a preset price or agree to an extension. Extensions are common, but repayment rights give note holders leverage that SAFE holders lack.
SAFEs in Brief
Y Combinator introduced the SAFE in 2013 as a simpler alternative to notes. A SAFE is not debt, a warrant or a futures contract; it is a contractual right to receive equity later. There is no interest and no maturity date, so a SAFE stays outstanding until a conversion, liquidity or dissolution event. In 2018, YC released the “post-money” SAFE, which is now the standard form for many early-stage raises.
Key Terms Side by Side
- Valuation cap: Both instruments commonly use a cap, which sets the maximum valuation at which the investment converts. Note caps are usually measured pre-money; post-money SAFE caps include all SAFEs and other convertibles.
- Discount: Either instrument may give the investor a discount, such as 20%, off the price new investors pay. If both a cap and a discount apply, the investor generally gets whichever produces more shares.
- Interest: Notes accrue interest, which typically converts into additional shares. SAFEs have none.
- Maturity: Notes have one; SAFEs don’t.
- MFN: A most-favored-nation clause lets an investor adopt better terms the company later gives other investors in similar instruments. YC publishes an MFN-only SAFE, and notes can include similar provisions.
- Conversion trigger: Notes usually convert in a qualified financing above a negotiated dollar threshold. The YC post-money SAFE converts in an “Equity Financing,” defined as a bona fide financing in which the company sells preferred stock at a fixed valuation. The standard form has no minimum raise amount, so even a small priced preferred round can trigger conversion, but issuing more SAFEs or selling common stock generally will not.
Post-Money vs. Pre-Money SAFEs: A Dilution Example
With a post-money SAFE, the investor’s ownership is simple to estimate: the purchase amount divided by the post-money valuation cap. That percentage is measured immediately before the priced round, regardless of how many other SAFEs the company issues.
Example: A company raises $1,000,000 on post-money SAFEs with a $10,000,000 cap. Those SAFE holders will own 10% of the company before the new priced-round money comes in. If the company later raises another $1,000,000 on SAFEs at the same cap, those investors also get 10%, and the founders and other existing holders absorb the full 20% of dilution. All SAFE holders are then diluted, along with everyone else, by the priced round itself.
Under the older pre-money SAFE, the cap was measured before the SAFE money, so SAFE holders diluted one another and final percentages were harder to predict. Post-money SAFEs give investors certainty, but they shift more of the dilution from each additional SAFE to founders.
Acquisitions and Shutdowns
If the company is acquired before conversion:
- Post-money SAFE holders generally receive the greater of their purchase amount or the amount they would receive if the SAFE converted to common stock at the cap.
- Note holders receive whatever the note provides, often repayment of principal and interest plus a premium, or conversion at the cap.
If the company dissolves, note holders are creditors and are paid ahead of stockholders. Under the standard post-money SAFE, holders are entitled to their purchase amount after creditors but ahead of common stockholders, to the extent assets remain. In a shutdown, there is often little left to distribute.
Securities Law, Tax and QSBS
Both notes and SAFEs are securities. They must be sold under an exemption from registration, usually Rule 506(b) of Regulation D, which typically means filing a Form D with the SEC and making state notice filings, including in California. “Simple” describes the document, not the legal requirements.
Tax treatment differs, too. A note is debt, so interest is generally taxable to the investor, and the holding period for qualified small business stock (QSBS) generally starts at conversion, when the investor receives stock. SAFE tax treatment is less settled. Many practitioners treat a SAFE as equity-like, but whether the QSBS holding period begins at purchase or at conversion remains uncertain. Section 1202 was also amended in 2025 for stock issued after the effective date, so investors who care about QSBS should get tax advice before investing.
When to Use Which
- SAFEs tend to suit pre-seed and seed rounds with investors familiar with the YC forms, especially when the company wants speed, low legal cost and no repayment risk.
- Convertible notes can fit bridge rounds between priced rounds, investors who want creditor protections and situations where investors are not comfortable with SAFEs.
Either way, model conversion scenarios before signing and track every instrument on your cap table.
Frequently Asked Questions
Is a SAFE the same as a convertible note?
No. A convertible note is debt that accrues interest and has a maturity date. A SAFE is a contractual right to future equity with no interest or maturity, though both typically convert in a future priced round.
What happens to a convertible note at maturity?
It depends on the note’s terms. Common outcomes include extending the maturity date, converting into equity at a preset price or repayment if the holder demands it. Because repayment can be a real risk for a cash-constrained startup, founders should negotiate maturity terms carefully.
Which is better for founders, a SAFE or a convertible note?
SAFEs are usually simpler and avoid repayment risk, which many founders prefer. However, post-money SAFEs can cause more founder dilution when a company raises several rounds of SAFEs, so the right choice depends on the amount raised, the cap and investor expectations.
Do I need to file a Form D for a SAFE or convertible note?
Usually, yes, if you rely on Regulation D. Form D is generally due within 15 days after the first sale, and many states, including California, require their own notice filings.
The Takeaway
Convertible notes and SAFEs both delay valuation and convert later, but a note is debt with interest and a maturity date, and a SAFE is not. Post-money SAFEs make each investor’s ownership predictable but concentrate the dilution from additional SAFEs on founders. Choose the instrument your investors expect, and model the outcome before you raise.
How Sutter Law Can Help
Sutter Law advises founders and investors on SAFEs, convertible notes and priced rounds, from term negotiation through conversion modeling and securities filings. Learn more about our business financing practice, or contact us for a free consultation.
This article is general information, not legal advice. Reading it does not create an attorney-client relationship.
