Question

What is a convertible note or SAFE?

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Answer

Ways of raising money without agreeing a valuation now — the investment converts into shares at a later priced round, on terms set in advance.

The problem they solve. Valuing a very early company is close to arbitrary, and negotiating one is slow and expensive in legal fees. A convertible instrument defers the question: take the money now, decide the price when there is more information.

Convertible note (or loan note). Structured as debt that converts to equity on a trigger event — usually a qualifying funding round. It has a maturity date and frequently an interest rate, which typically rolls into the conversion rather than being paid.

What happens at maturity if no round occurs is the significant risk: the note may become repayable, which a startup usually cannot do. In practice it is renegotiated, but the leverage sits with the investor.

SAFE (Simple Agreement for Future Equity). Developed by Y Combinator. Not debt — no maturity date, no interest, no repayment obligation. Simply a right to shares on a future event. Simpler and more founder-friendly, and now widely used.

The two terms that actually matter in both:

Discount. The investor converts at a percentage below the price paid in the priced round — commonly 10–25% — rewarding early risk.

Valuation cap. A maximum valuation at which their money converts, regardless of what the round is actually priced at. If the cap is £5m and the round prices at £15m, they convert as though the company were worth £5m — getting three times the equity per pound.

Where both apply, the investor usually receives whichever is more favourable.

The danger founders underestimate. Caps look like a technicality and are not. A low cap on a round that goes well causes very heavy dilution, and because conversion happens alongside the new investment, the dilution lands on founders rather than on the new investor. Raising several instruments at different caps compounds this, and the effect is invisible until the moment it is not.

Always model conversion at several outcomes before signing. Pre-money and post-money SAFEs allocate dilution differently, and the distinction is significant.

General information, not legal or financial advice.

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