definition

A convertible note is a type of short-term loan that can later be converted into equity in a company, usually during a future financing round. Instead of being repaid in cash, the investor’s loan amount converts into shares of the startup at a discounted price or with other favorable terms.

Convertible notes became especially popular in the startup world because they simplify early-stage fundraising.

Traditional equity financing requires extensive negotiation over valuation, which can be difficult for a young company with limited financial history.

A convertible note allows founders and investors to postpone that discussion until the company raises a larger, priced round of funding.

The note typically includes a few key terms: the discount rate (the percentage reduction investors receive on the future share price), a valuation cap (the maximum price at which the note will convert), and an interest rate (since it begins as debt). These terms reward early investors for taking on higher risk.

For example, when Airbnb was still an early startup, it raised money through convertible notes before closing larger venture capital rounds. This structure allowed the company to access capital quickly without locking in a premature valuation.

Convertible notes offer speed, flexibility, and a bridge between bootstrapping and venture capital. They enable startups to secure funding without slowing down momentum, while giving investors upside potential if the company grows.