Convertible Note
A convertible note is a short-term debt instrument used in early-stage startup financing that carries an interest rate and maturity date but is structured to convert into equity — typically preferred stock — at a future priced financing round, usually at a discount to the price paid by new investors or subject to a valuation cap.
The convertible note was the dominant instrument for seed-stage startup financing in the United States for decades before the SAFE gained widespread adoption following Y Combinator's introduction of that instrument in 2013. The convertible note structure originated as a practical compromise in early-stage company financing: determining a fair equity valuation for a very young company is difficult and often contentious, requiring expensive legal and financial due diligence that may not be proportionate to the amount being raised. By structuring the investment as debt with a future conversion right, founders and investors can defer the valuation negotiation to a later round when the company has more data and a more established track record.
As a debt instrument, a convertible note has three core financial terms that distinguish it from a SAFE. First, it carries an interest rate — typically 5% to 8% per year — which accrues on the outstanding principal. This accrued interest converts to equity along with the principal at the conversion event. Second, it has a maturity date — usually 18 to 24 months — at which point, if no qualifying financing event has occurred, the note technically matures and the principal plus accrued interest becomes due and payable. In practice, most convertible notes are extended rather than called at maturity, but the legal right to demand repayment gives noteholders theoretical leverage in negotiations. Third, it is a senior debt obligation, meaning that in the event of company dissolution, noteholders have priority over equity holders in claiming any remaining assets.
Like SAFEs, convertible notes typically include a valuation cap and a discount rate. The valuation cap establishes the maximum pre-money valuation at which conversion occurs, protecting early investors from dilution if the company becomes highly valued before the priced round. The discount rate (typically 10% to 25%) provides a price reduction relative to new investors at the conversion event.
The choice between a convertible note and a SAFE for early-stage financing involves tradeoffs that depend on investor preferences, founder circumstances, and negotiation dynamics. Investors who prefer the debt treatment — including the interest accretion, maturity date leverage, and senior priority — may prefer notes. Founders who want to avoid any debt on the balance sheet, eliminate repayment risk, and keep documentation minimal may prefer SAFEs. Both instruments are standard in U.S. startup financing practice, and familiarity with both is important for investors, founders, and equity market participants evaluating private company financing structures.