Founder Vesting: Complete Guide

Why Founder Vesting Exists

Founder vesting protects everyone — including the founders themselves. Without vesting, a co-founder who leaves after 6 months walks away with their full equity allocation, leaving the remaining founders to build the company while carrying dead equity on the cap table.

Investors require founder vesting for the same reason: they're investing in the team's future execution, not in a one-time contribution. Vesting ensures that equity is earned over time through continued contribution.

Standard Vesting Structures

The standard founder vesting schedule: 4 years total vesting with a 1-year cliff.

4-year vesting: Equity vests in equal monthly increments over 48 months. After 4 years, you own all your allocated shares.

1-year cliff: No equity vests during the first 12 months. On the cliff date, 25% vests at once. After that, remaining equity vests monthly (1/48th per month).

Why the cliff: It prevents a founder who leaves in the first few months from owning any equity. The cliff is a commitment test — if you're not willing to commit for at least a year, you shouldn't have equity.

Credit for time served: If you founded the company 18 months before raising, negotiate credit for that period. Standard approach: accelerate 18 months of vesting at closing, so you're already 18/48 vested on day one of the new schedule.

Acceleration Clauses

Single-trigger acceleration: All or a portion of unvested shares vest immediately upon a change of control (acquisition). This protects the founder from being fired by the acquirer and losing unvested equity.

Double-trigger acceleration: Shares only accelerate if there's BOTH a change of control AND the founder is terminated (or has a significant role change) within 12-24 months. This is more investor-friendly because it keeps founders engaged through transitions.

Most investors prefer double-trigger. Most founders want single-trigger. The compromise is usually double-trigger with 50-100% acceleration — if the company is acquired AND you're let go, you get all your shares.

Negotiate this before signing the term sheet. Acceleration clauses are much harder to add after the investment closes.

Common Vesting Mistakes

No vesting at all: A co-founder holds 30% with no vesting. They leave after 8 months. Now you have 30% dead equity on your cap table that every future investor will question. Always vest.

Equal vesting with unequal contributions: If one co-founder is full-time and another is part-time, vesting should reflect the difference — either through different allocations or different vesting schedules.

No acceleration clause: If the company is acquired and the acquirer terminates you, you lose unvested shares. Without acceleration, a successful exit can leave founders with less than they deserve.

Vesting from investment date, not founding date: If you've been building for 2 years, your vesting should credit that time. Investors who insist on a fresh 4-year clock are being aggressive — push back.