Short answer: Convertible notes and SAFEs let startups raise capital before a priced equity round. A convertible note is debt that may convert into equity later and usually includes interest and maturity. A SAFE is not debt and usually converts into equity when a future financing happens, based on terms such as valuation cap, discount, or MFN. Both can look simple, but they can create dilution and cap-table surprises if founders do not model conversion outcomes.
Founders often choose convertible notes or SAFEs because they are faster than a priced round. They delay the hard valuation negotiation until a later financing and can be useful when the company needs seed capital quickly. The trade-off is that the real economic outcome is pushed into the future.
Convertible notes vs SAFEs at a glance
| Feature | Convertible note | SAFE |
|---|---|---|
| Legal nature | Debt instrument that may convert into equity. | Contractual right to future equity, not debt. |
| Interest | Usually accrues interest. | Usually no interest. |
| Maturity | Usually has a maturity date. | Usually no maturity date. |
| Conversion | Converts at a qualified financing or other trigger. | Converts at a priced equity financing or other specified event. |
| Key economics | Valuation cap, discount, interest, maturity, repayment or conversion rights. | Valuation cap, discount, MFN, pro rata rights, post-money or pre-money mechanics. |
| Main founder risk | Repayment pressure or difficult maturity negotiation if no qualified financing occurs. | Accumulated SAFEs can create unexpected dilution when the priced round happens. |
Key terms founders must understand
- Valuation cap: sets the maximum valuation used for conversion, giving early investors upside if the next priced round is higher.
- Discount: lets the investor convert at a lower price than new investors in the qualified financing.
- Interest: applies to convertible notes and may increase the amount converting or repayable.
- Maturity date: creates a deadline for repayment, extension, or conversion under the note terms.
- MFN: can let an investor adopt more favorable terms from a later SAFE or note financing.
- Qualified financing: defines the future round that triggers conversion.
- Change of control: defines what happens if the company is sold before conversion.
Y Combinator's SAFE documents are useful context for common SAFE forms. The NVCA model legal documents are useful context for priced venture financing documents that often follow or absorb earlier notes and SAFEs.
Why conversion modelling matters
A founder should model multiple conversion outcomes before signing. The same headline investment can produce different dilution depending on whether the instrument has a cap, discount, MFN, post-money SAFE mechanics, accrued interest, or multiple investors with different terms.
Founders should model at least three scenarios:
- A lower-than-expected priced round.
- A strong priced round above the valuation cap.
- A sale before a priced round.
Conversion can also affect liquidation preference and ownership in the priced round. For more context, see our article on liquidation preference.
When a convertible note can fit
A convertible note can fit when investors want debt-style protection, interest, a maturity date, or more negotiated default/remedy mechanics. It may also be familiar to investors in jurisdictions or situations where notes are common. The founder risk is that maturity arrives before the next priced round, creating pressure to repay, renegotiate, or convert on terms that may not be ideal.
When a SAFE can fit
A SAFE can fit when speed and simplicity matter, especially for early-stage rounds where founders and investors expect a later priced equity financing. The founder risk is not repayment; it is dilution and cap-table complexity if many SAFEs are issued over time without clear modelling.
Founder checklist before signing
- Model dilution at different future valuations.
- Check whether the SAFE is pre-money or post-money.
- Understand whether a cap, discount, or both apply.
- Review maturity, interest, default, and repayment rights for notes.
- Check conversion treatment in a sale before a priced round.
- Confirm how the instrument affects option pool, pro rata rights, and liquidation preference.
- Have counsel review the document before signing.
For broader financing context, see our guides to venture capital financing stages, venture debt, and term sheet terms.
How Alehar can help
Alehar helps founders compare financing options, model dilution, prepare investor materials, and understand how early financing terms affect later rounds and exits. Learn more about Raising Equity or Debt, or contact us to discuss a financing plan.
