---
title: Double-trigger vesting — what it means and why it matters | Allocate AI
description: A rule at many private companies where RSUs need two events to vest: your time-based schedule and a liquidity event like an IPO or acquisition.
canonical: https://allocateai.io/glossary/double-trigger-vesting
site: Allocate AI — https://allocateai.io
---

# Double-trigger vesting

A rule at many private companies where RSUs need two events to vest: your time-based schedule and a liquidity event like an IPO or acquisition.

Double-trigger RSUs need two things to happen before they are yours. The first trigger is the usual time-based schedule: you have been there long enough for a block to vest. The second is a liquidity event, most often an IPO or an acquisition. Until both have happened, the shares are not delivered and not taxed.

Private companies use this structure to avoid the problem of single-trigger RSUs, where employees owe income tax on shares they cannot sell. With double trigger, nothing is taxable until there is a market for the stock.

The planning consequence is that the tax arrives in a pile. Suppose you have worked at a startup for three years and $300,000 of RSUs have met the time trigger. The company goes public, the second trigger fires, and all $300,000 becomes ordinary income in one year. Withholding at the 22% supplemental rate (2026) will fall well short of the 35% or 37% you may actually owe. Many people at newly public companies face a surprise tax bill the following April for exactly this reason.

The common mistake is leaving before the liquidity event. Under most plans, RSUs that met the time trigger but not the second one are forfeited when you leave, though some plans keep them alive for a period. Read the plan document; the answer decides how much your equity is worth if you resign.

[Try the RSU Tax Calculator →](https://allocateai.io/calculators/rsu-tax)

## Related terms

- [RSU (restricted stock unit)](https://allocateai.io/glossary/rsu) — A promise from your employer to give you shares of company stock on a future date, as long as you are still there when that date arrives.
- [Vesting (and vesting schedules)](https://allocateai.io/glossary/vesting) — The process by which promised stock or retirement money becomes truly yours over time, usually on a fixed calendar called a vesting schedule.
- [Withholding gap](https://allocateai.io/glossary/withholding-gap) — The difference between the tax your employer took out during the year and the tax you actually owe, which becomes a bill or a refund in April.
- [Estimated taxes (quarterly payments)](https://allocateai.io/glossary/estimated-taxes) — Tax payments you send directly to the IRS four times a year when withholding will not cover what you owe, common with big equity gains or side income.

**Plan in plain language.**

Allocate answers “can I afford this?” from your own numbers, writes the plan, and stages every change for your yes. It starts from an estimate before you link a bank.

[Get started](https://app.allocateai.io/signup)

---

Allocate AI is a budgeting and financial-planning app: link your accounts, say what you want in plain words, and it writes the plan and stages every change for your approval. Read more at https://allocateai.io or see all pages in https://allocateai.io/llms.txt.