A convertible note is a loan that may turn into stock; a SAFE is a contract for a future ownership interest if specified events occur. That distinction affects repayment, interest, maturity, conversion, and who ranks ahead if a startup is sold or winds down. Neither instrument is automatically better: the signed terms and the company’s financing plans determine the outcome.
How a convertible note differs from a SAFE
A convertible promissory note is debt issued by a startup to an investor. It commonly converts into preferred stock at a later financing or another agreed event, but until conversion it is generally a loan with a repayment obligation. Notes commonly include interest and a maturity date, although the details depend on the contract. The U.S. Securities and Exchange Commission (SEC) describes these instruments in its startup securities overview.
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A SAFE—short for Simple Agreement for Future Equity—is an agreement under which the company promises a future ownership interest if contractual triggers occur. Under the standard Y Combinator (YC) SAFE, it is not a loan and has neither interest nor a maturity date. The SEC explains that a SAFE holder does not receive an ownership interest before the triggering event and conversion. Modified or non-YC documents may differ, so the contract controls.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problems| Term | Convertible note | YC standard SAFE |
|---|---|---|
| Legal and economic character | Debt that may convert into equity | Contractual claim to future equity upon specified events; not debt under YC’s standard form |
| Interest | Commonly accrues; check whether it converts with principal or is otherwise payable | None |
| Maturity date | Commonly has one; the agreement defines what happens if it arrives before conversion | None |
| Conversion | At events and on terms specified in the note | At events and on terms specified in the SAFE |
These comparisons describe common note features and YC’s standard SAFE, not every agreement. As the SEC cautions in its SAFE investor bulletin, “There is nothing standard or simple about a SAFE.”
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What triggers conversion—and what if it never happens?
Read the conversion clause before comparing headline terms. Identify the precise qualifying financing or other event, any minimum size or security requirements, and what happens if the company raises money through a different instrument. A financing does not necessarily convert a SAFE if it does not meet the SAFE’s trigger. The SEC warns that a SAFE may fail to convert when its specified trigger is not activated.
If the expected priced financing never occurs, a SAFE with no applicable alternative trigger can remain outstanding without a maturity deadline under YC’s standard form. A note, by contrast, reaches its maturity date, at which point the company and investor must follow the note’s stated options and obligations. Do not assume a note automatically converts or that a SAFE automatically pays out; check the actual language governing financing, acquisition, dissolution, and repayment.
Interest, maturity, caps, and discounts
Interest and maturity
For a note, check the interest rate, how interest accrues, whether accrued interest converts along with principal, the maturity date, and the parties’ choices or remedies at maturity. For YC’s standard SAFE, there is no interest accrual and no maturity deadline. Those features can make a SAFE simpler to administer, but the absence of a deadline also means it can remain unresolved if no trigger occurs.
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A valuation cap sets the highest valuation used for conversion under the applicable formula; a discount reduces the conversion price relative to the price paid in the qualifying equity round. Both notes and SAFEs can include conversion-price incentives, but definitions and calculations vary by document. YC says its standard discount SAFE forms commonly use discounts of 10–20%; that describes YC’s form guidance, not a universal market rate or a guarantee of what any investor will receive.
Do not treat a cap as the startup’s agreed valuation or as a complete statement of the investor’s eventual ownership. The conversion price, capitalization definition, other financing instruments, and changes to the option pool can all affect the result.
How caps and multiple instruments affect dilution
YC has used post-money SAFEs as its standard since 2018. In YC’s post-money cap SAFE, the ownership sold is calculated as the investment divided by the cap. For example, YC’s illustration says five $100,000 SAFEs at a $5 million cap represent 10% sold in total—not 2%—because each investment represents 2% on that calculation and the five add together. This is an illustration of YC’s post-money cap mechanics, not a forecast of a company’s final capitalization.
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Pre-money and post-money definitions can change who bears dilution and how ownership is calculated. Founders should model all outstanding SAFEs and notes together, including discounts, MFN provisions, side letters, and option-pool changes, rather than assessing each cap in isolation. YC’s SAFE forms and resources explain its form conventions; other documents may use different definitions.
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What happens in a sale, shutdown, or other downside outcome?
Debt generally ranks ahead of equity in a sale or wind-down. YC’s comparison therefore places SAFE holders behind outstanding debt in those outcomes. The precise result depends on the contracts and applicable law, so examine each document’s treatment of liquidation, dissolution, repurchase, and repayment rather than relying on labels alone.
The SEC specifically urges SAFE investors to understand conversion, repurchase, dissolution, and voting provisions. A note’s debt claim may provide a repayment right, but collectability depends on the company’s circumstances and the agreement. A SAFE generally is not an ordinary repayment claim; its value depends on contractual rights and events.
Additional rights to check
The main instrument may not contain the full deal. YC’s current standard materials put optional pro rata rights in a separate side letter; those rights can affect an investor’s ability to participate in a later round. MFN provisions may allow a holder to adopt later SAFE terms. Review all side letters, amendments, and related agreements, and check how they interact with the main instrument.
When might each instrument fit?
A SAFE may fit when avoiding debt obligations is important
A founder may prefer a SAFE when raising early-stage capital without interest or a maturity deadline, and both sides accept the specified conversion and dilution mechanics. The trade-off is that the investor’s future ownership depends on the contractual trigger and terms. YC describes its SAFE as an early-stage financing instrument, but that issuer guidance is not a rule for every company.
A convertible note may fit a debt-based bridge
A note may suit a bridge financing or a situation where an investor specifically wants debt, interest, and a maturity date. YC describes notes as useful for bridge loans or follow-on situations involving existing notes. That is YC’s guidance, not a universal standard. The maturity date can focus negotiations if the anticipated financing is delayed or does not occur.
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A priced equity round is another option
In a priced round, the parties agree on a valuation and issue stock with negotiated equity terms. YC’s comparison identifies it as a fit when a lead investor wants a firm valuation and a fuller set of negotiated rights. It can make ownership and governance terms more explicit, but requires agreement on those terms up front.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Questions founders and investors should resolve before signing
- Conversion: What exact event qualifies, and does the clause impose a minimum financing amount or require a particular security?
- At maturity (notes): What must or may each party do if the note is not converted by its due date?
- Price mechanics: How do the cap, discount, accrued interest, and capitalization definitions interact?
- Aggregate dilution: What ownership results after counting every outstanding instrument and option-pool change?
- Downside: What happens on a sale, dissolution, repurchase, or wind-down, and how does the claim rank against other obligations?
- Other rights: Are there MFN terms, pro rata rights, voting provisions, side letters, or amendments that change the economics?
- Governing law and approvals: Is the document appropriate for the company’s jurisdiction, and have required company approvals and securities-law steps been addressed?
Jurisdiction and legal review matter
SAFEs and convertible notes are financing instruments in a securities-law context; choosing a SAFE does not remove applicable securities-law obligations. YC lists separate forms for U.S. companies and for Canada, the Cayman Islands, and Singapore. Its online SAFE tool currently supports only U.S.-incorporated companies, and YC recommends local counsel for companies formed elsewhere. A U.S. template should not be treated as universally suitable. The SEC and YC materials are educational and form guidance, not legal advice for a particular transaction.
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