What is founder reverse vesting?
Founder reverse vesting is the mechanism by which a VC requires founders to “re-earn” their pre-existing equity stake over time, typically 4 years with a 1-year cliff. Unlike forward vesting (where new shares are earned), reverse vesting takes founders’ already-issued shares and makes them subject to repurchase by the company if the founder departs early.
How it works mechanically
At the Series A closing, the founder signs a “repurchase right” agreement: if the founder leaves within the first year, the company can buy back 100% of their shares at original issuance price (often near zero). After year 1, the cliff “drops” and 25% of shares are vested; remaining 75% vest monthly over years 2-4. At year 4, the founder is fully vested and the repurchase right disappears.
Why VCs require it
Reverse vesting protects against the “founder walks away with all the equity” scenario after a single round of funding. Without it, a founder receiving USD 5M for 25% of company could potentially leave and retain 75% of the equity. Reverse vesting creates economic incentive to stay for the full 4-year period during which the company is building.
Acceleration triggers
Founders should negotiate acceleration on (1) change of control — single trigger: 50-100% acceleration on acquisition; double trigger: acceleration on acquisition + involuntary termination within 12 months. (2) Termination without cause — typically 6-12 months acceleration if VC-led termination not for “cause.” Both terms are heavily negotiated.
Tax treatment — 83(b) election
In US-flipped structures, founders should file an 83(b) election within 30 days of reverse vesting agreement — locking tax liability at zero (since the repurchase price equals fair value) rather than incurring ordinary income as shares vest. Missing the 83(b) window can create massive tax exposure as company value grows.
Related: Founder Vesting Cliff, Anti-Dilution, Liquidation Waterfall, Full Ratchet.