A short-term debt instrument that converts into equity at a future financing round. Includes interest rate (typically 2-8%), maturity date (usually 12-24 months), and typically a valuation cap and/or discount.
convertible note
/kənˈvɜːtɪbəl nəʊt/ noun — A short-term debt instrument used in early-stage startup financing, structured as a loan that automatically converts into equity (typically preferred stock) upon the occurrence of a qualifying financing event. Unlike a SAFE, a convertible note accrues interest and carries a maturity date — creating a legal obligation to repay if no qualifying conversion event occurs before maturity.
Why it matters
Convertible notes were the standard early-stage fundraising instrument before SAFEs gained popularity. They are still widely used, especially by angel investors and in regions outside Silicon Valley. Because convertible notes are technically debt, they sit higher in the capital stack than equity, giving investors slightly more protection if the company fails.
The trade-off for founders is that notes accrue interest and have a maturity date, which creates pressure to either raise a priced round or renegotiate the terms before time runs out. A company with multiple matured notes on its books is in a precarious legal position — the note holders could theoretically demand repayment, forcing a wind-down even if the company has real traction.
Understanding the economics of convertible notes — how caps, discounts, and accrued interest interact at conversion — helps founders model the real dilution impact before signing. A note that seems small ($250,000 at a $5 million cap) can represent meaningful dilution relative to a much larger round if the company's valuation grows significantly.
How it works
An investor lends money to the startup with the expectation that the loan will convert into equity at the next qualifying financing round. The note specifies an interest rate (say 5%), a maturity date (say 18 months), and conversion terms like a valuation cap and discount rate.
When the startup raises a Series A, the note principal plus accrued interest converts into shares at the more favorable of the cap price or the discounted price. For example, if an investor lends $100,000 at 5% interest with an 18-month term, after one year the note is worth $105,000. If the Series A values shares at $2.00 each and the note has a 20% discount, the investor converts at $1.60 per share, receiving approximately 65,625 shares instead of the 52,500 they would get at the full price.
If the note also has a $6 million valuation cap and the Series A prices the company at $20 million, the cap kicks in: the investor converts as if the valuation were $6 million, receiving even more shares per dollar. The conversion always uses whichever mechanism (cap or discount) is more favorable to the investor.
If the maturity date arrives without a qualifying round, the investor can demand repayment, negotiate an extension, or convert at a predetermined price. This maturity pressure is the biggest structural difference from a SAFE, and it is the primary reason founders increasingly prefer SAFEs for early-stage fundraising when both options are available.
| Feature | Convertible note | SAFE |
|---|---|---|
| Legal structure | Debt instrument | Equity instrument (not debt) |
| Interest accrual | Yes — typically 2-8%/year | No |
| Maturity date | Yes — usually 12-24 months | No |
| Repayment risk | Yes — can demand repayment at maturity | No — no repayment obligation |
| Common in | Angel investing; outside Silicon Valley | US seed rounds; YC companies |
| Complexity | More complex; more negotiation points | Simpler; fewer terms to negotiate |
History and origin
Convertible notes emerged as a startup financing tool in the 1980s and 1990s, drawn from the broader category of convertible debt used in corporate finance. Early venture capitalists and angel investors, faced with the practical difficulty of valuing pre-revenue companies, found that convertible notes offered a pragmatic solution: defer the valuation question until more information was available, while still providing the startup with needed capital.
The instrument gained widespread adoption in the mid-2000s as seed investing formalized. Investors and founders both appreciated the simplicity: rather than negotiating a full term sheet with board seats, liquidation preferences, and anti-dilution provisions, both sides could close a deal with a few-page convertible note in days. The valuation cap emerged as a standard term around this period to ensure early investors received meaningful benefit from taking early risk.
Y Combinator's introduction of the SAFE in 2013 challenged the convertible note's dominance in US seed rounds. The SAFE removed the maturity date and interest accrual — the features founders found most problematic — while maintaining the simplicity of a convertible instrument. SAFEs have become the dominant seed instrument for US companies, particularly in Silicon Valley, but convertible notes retain significant use among angel investors, in international markets, and in situations where investors prefer the additional protection of debt status.
Frequently asked questions
What is a convertible note?
A convertible note is a short-term debt instrument used in early-stage startup fundraising. The investor lends money to the startup, and rather than being repaid with cash, the loan converts into equity (typically preferred stock) at the next qualifying financing round. The note includes an interest rate, a maturity date, and usually a valuation cap and/or discount rate.
What is the difference between a convertible note and a SAFE?
A convertible note is legally debt — it accrues interest, has a maturity date, and if not converted, must be repaid or renegotiated. A SAFE is not debt — it has no maturity date, accrues no interest, and simply converts at the next qualifying event. SAFEs are simpler and less risky for founders; convertible notes give investors slightly more protection.
What is a valuation cap on a convertible note?
A valuation cap is the maximum company valuation at which the note converts to equity. It protects early investors from over-dilution if the company's valuation grows dramatically before the qualifying round. For example, if an investor holds a note with a $5 million cap and the Series A prices the company at $20 million, the note converts as if the valuation were $5 million.
What is a discount rate on a convertible note?
A discount rate is a percentage reduction applied to the next round's share price when the note converts. If a convertible note has a 20% discount and the Series A prices shares at $2.00, the note converts at $1.60/share. Typical discount rates range from 10% to 30%, with 20% being most common.
What happens when a convertible note matures?
If a convertible note reaches its maturity date without a qualifying financing round, the investor can demand repayment in cash, convert at a pre-agreed valuation, or negotiate an extension. Maturity events are usually handled amicably — most early investors prefer to extend rather than force a cash repayment that could harm the company.
Why would an investor choose a convertible note over a SAFE?
Convertible notes are debt instruments, which means they sit higher in the capital stack than equity in a dissolution scenario. Some institutional investors prefer the legal familiarity and investor protection of a note structure. In regions where SAFEs are less commonly understood by local attorneys, convertible notes may also be easier to execute.
How do multiple convertible notes interact at a Series A?
When a company raises a Series A, all outstanding convertible notes convert simultaneously. Each note converts at the more favorable of the cap price or the discounted price. Notes with different caps and discounts convert at different effective prices, resulting in investors receiving different share counts per dollar invested. The total dilution from note conversions is part of the Series A closing calculations and must be reflected in the updated cap table.
Learn more
- Convertible notes vs. SAFEs
- SAFE notes explained
- What investors look for in cap tables
- How to build a startup cap table
Related terms
- SAFE (Simple Agreement for Future Equity)
- Valuation Cap
- Discount Rate
- Dilution
- Bridge Round
- Cap Table
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