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A convertible note is debt that may convert into stock; a SAFE is a contract for a possible future ownership interest. The difference affects repayment, interest, maturity, conversion triggers, dilution, and priority if the company is sold or winds down. A SAFE is not automatically simpler or better: the signed terms determine what happens.
How a convertible note differs from a SAFE
A convertible promissory note is a loan to a company that may convert from debt into stock—often preferred stock—in a later financing or another event specified by the agreement. Notes commonly include interest and a maturity date, when repayment or another negotiated outcome may come due. The precise obligations depend on the note. The SEC’s overview of convertible securities describes these typical features.
A SAFE (Simple Agreement for Future Equity) is a contract promising an investor a future ownership interest if specified events occur. Under the current standard Y Combinator SAFE forms, a SAFE has no interest or maturity date and is not a loan. The SEC notes that a SAFE holder does not have an ownership interest before the triggering event and conversion. Modified or non-YC documents may differ, so the label alone does not establish the legal or economic terms.
| Feature | Convertible note | SAFE |
|---|---|---|
| Basic character | Debt that can convert into another security. | Contractual right to possible future ownership if stated events occur. |
| Interest and maturity | Commonly includes interest and a maturity date; read the instrument for accrual and maturity consequences. | No interest or maturity date in YC’s standard SAFE; other forms may differ. |
| Conversion | Converts when the note’s conditions are met; details vary. | Converts only if the contract’s trigger and conditions are met. |
| Repayment / downside | As debt, generally carries a repayment obligation and ranks ahead of equity, subject to the documents and applicable law. | Does not carry an ordinary loan repayment obligation under YC’s standard form; treatment on a sale or wind-down depends on the contract. |
| Ownership calculation | Can be affected by its conversion price, interest, and other terms. | Can be affected by cap, discount, pre- or post-money structure, and other terms. |
When does each instrument convert?
Do not assume that any fundraising round automatically converts an instrument. Read the definition of a qualifying financing and check whether it requires a minimum amount, a particular type of security, or another condition. Also identify what happens in an acquisition, IPO, or other event, and what happens if the company raises capital in a form that does not meet the trigger. The SEC cautions that a SAFE may not convert if its trigger is not activated; its SAFE investor bulletin recommends understanding conversion, repurchase, dissolution, and voting terms.
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Interest and maturity: a debt deadline versus a conditional claim
A note’s interest can increase the amount due or the amount converted, depending on its terms. At maturity, the company and investor may have to address repayment, an extension, conversion, or another outcome provided in the note. Check whether interest is simple or compounded, when it begins, whether it converts with principal, and what the investor can demand at maturity.
YC’s standard SAFE has neither interest nor a maturity date. That avoids a scheduled debt deadline, but it does not guarantee that conversion will occur: if no contractual trigger happens, the SAFE may remain outstanding. The key contrast is not “repayment versus guaranteed equity”; it is debt obligations and a maturity framework versus a conditional future-equity claim under the SAFE’s trigger language.
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How caps, discounts, and dilution affect ownership
A valuation cap sets a ceiling on the valuation used to calculate conversion under the applicable formula; a discount reduces the conversion price relative to the price paid in the equity financing. Both notes and SAFEs can include these mechanisms, but their definitions and calculations are document-specific. YC describes 10–20% as common for discount terms in its standard-form guidance; that is not a universal market rule.
YC has used post-money SAFEs since 2018. For its post-money cap SAFE, the stated ownership sold is investment divided by the cap. YC’s example: five $100,000 SAFEs at a $5 million cap represent 10% sold in total, rather than 2%. This illustration applies to that post-money SAFE calculation—not to every SAFE, note, or capitalization scenario. Option-pool changes, discounts, notes, and other instruments can alter the eventual ownership picture. Model the whole financing rather than adding up headline caps in isolation.
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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 problemsYC explains the distinction between its post-money SAFE and earlier pre-money structures in its SAFE comparison. Optional pro rata rights are handled in a separate side letter in YC’s current standard materials, and a most-favored-nation (MFN) term may allow an investor to adopt later SAFE terms. Review side letters, amendments, and all outstanding instruments alongside the main agreement.
What happens in a sale or wind-down?
Priority matters most when a company cannot deliver the expected financing outcome. YC’s comparison says debt is senior to equity in a sale or wind-down, so SAFE holders sit behind outstanding debt under that framework. That is not a substitute for reading the specific documents: inspect repayment, liquidation, dissolution, repurchase, and conversion provisions, and consider how other creditors and securities affect the result.
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Which instrument may fit a startup or investor?
A SAFE may suit a financing without debt maturity
A founder may consider a SAFE when the goal is early-stage financing without scheduled interest or a maturity obligation, and both sides understand the trigger and dilution mechanics. An investor should account for the absence of an ordinary loan repayment claim and the possibility that a trigger never occurs. YC presents its SAFE as an early-stage financing option, but that issuer guidance does not make it suitable for every company or investor.
A convertible note may suit a debt-based bridge
A note may fit a bridge financing or a situation in which the investor specifically wants debt, interest, and a maturity date. YC’s comparison frames notes as useful for bridge loans or follow-on situations involving existing notes; this is YC’s guidance, not a universal market rule. Founders should be prepared for the maturity consequences, while investors should understand whether repayment is realistic and how the conversion provisions work.
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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 rights. YC’s comparison describes this as an option when a lead investor wants a firm valuation and a fuller set of equity terms. It is a distinct alternative, not simply a note or SAFE with a different name.
Checklist before signing or investing
- Confirm the exact conversion triggers, financing threshold, qualifying security, and treatment of a sale, IPO, or other event.
- For a note, verify principal, interest calculation, maturity date, conversion of accrued interest, and choices at maturity.
- For a SAFE, verify whether it is pre-money or post-money and how its cap, discount, MFN, and any side-letter rights operate.
- Model dilution across all notes, SAFEs, option-pool changes, and proposed financing terms.
- Read priority, liquidation, dissolution, repayment, repurchase, and voting provisions in the signed documents.
- Check amendments and side letters, not just the main instrument.
Jurisdiction and legal review
The SEC discusses both notes and SAFEs as startup financing instruments in a securities-law context; choosing a SAFE does not remove applicable securities-law obligations. YC provides forms for U.S. companies and separate forms for Canada, the Cayman Islands, and Singapore, while its online SAFE tool currently supports only U.S.-incorporated companies. A U.S. form should not be assumed suitable elsewhere. The SEC’s educational pages are not a substitute for advice on a particular contract; have qualified counsel familiar with the company’s jurisdiction review the instrument and related approvals.
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