Convertible Notes Explainer
A convertible note is a loan designed to convert into another security, commonly preferred stock, when a later financing event meets the agreement’s terms. Startups often use notes before a priced equity round establishes a formal share price. Because the instrument begins as debt, it typically carries interest and a maturity date even though the expected outcome may be conversion rather than cash repayment.
When a qualifying financing occurs, the outstanding principal and usually accrued interest convert into shares. The conversion price may reflect a discount to the price paid by new investors, a valuation cap, or whichever mechanism gives the noteholder the more favorable result under the contract. For example, a $100,000 note can convert into equity at the next round instead of being repaid in cash, with the final share count determined by the agreed terms.
For founders, a note can postpone a detailed valuation discussion and may be faster to negotiate than a full priced round. For investors, it can provide a contractual claim and a path to equity on potentially favorable terms. The tradeoffs include future dilution, interest accumulation, and uncertainty if a financing does not occur before maturity. Multiple notes with different caps or discounts can also make the eventual ownership calculation difficult to understand.
Convertible notes are not standardized, and small wording changes can affect conversion, repayment, voting rights, security interests, or treatment in a sale. They also differ from instruments such as a simple agreement for future equity, which is generally structured as a contract for future equity rather than debt and ordinarily has no interest or maturity date. Founders and investors should model the capitalization impact and obtain appropriate legal, accounting, and tax advice before signing.
Review principal, interest, maturity, the definition of a qualifying financing, conversion discount, valuation cap, and any repayment or sale provisions.
Terms interact, so a favorable headline discount may not describe the final ownership result.
At conversion, principal and often accrued interest are divided by the applicable conversion price to determine the number of shares.
Model several future financing valuations and include every outstanding note to see the potential dilution.
A convertible note begins as debt and commonly has interest and maturity. A SAFE is generally a contract for future equity rather than debt.
Neither structure is automatically better; compare legal obligations, conversion triggers, dilution, and the company’s financing plan.
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