A vesting schedule sets out the conditions and timeline under which a recipient gains non-forfeitable rights to compensation that was promised but not immediately owned. It is most commonly attached to stock options, restricted stock units (RSUs), employer contributions to retirement plans, and partnership interests. Until shares or contributions "vest," the employee can typically forfeit them by leaving the organisation or failing to meet performance conditions.
Two structures dominate in practice:
- Time-based vesting, where ownership accrues with continued service. The Silicon Valley convention for startup equity is a four-year schedule with a one-year cliff: nothing vests for the first 12 months, then 25% vests at the cliff, with the remainder vesting monthly or quarterly thereafter.
- Milestone or performance vesting, where shares vest upon hitting defined targets such as revenue thresholds, an IPO, or an acquisition.
Hybrid arrangements combine both, and "double-trigger" clauses (common for RSUs at pre-IPO companies) require both continued employment and a liquidity event before shares are released.
In the United States, employer contributions to qualified retirement plans such as 401(k)s are regulated by the Employee Retirement Income Security Act (ERISA) of 1974. Following amendments in the Pension Protection Act of 2006, employer matching contributions must vest under either a three-year cliff or a six-year graded schedule. Employee elective deferrals are always immediately and fully vested.
For think-tank and policy researchers, vesting schedules matter beyond HR: they shape executive incentives, influence retention in government-adjacent contractors, and feature in debates over short-termism, talent mobility, and non-compete reform. They are also central to founder disputes, since unvested equity is generally clawed back upon departure, and to merger negotiations, where acceleration clauses determine whether vesting speeds up on a change of control.
Vesting terms are normally documented in a grant agreement, an equity incentive plan, or a summary plan description.
Example
When Twitter was acquired by Elon Musk in October 2022, employees with unvested RSUs faced uncertainty over whether their vesting schedules would accelerate or be honoured under the private company's new equity plan.
Frequently asked questions
A cliff is an initial waiting period during which no equity vests; if the employee leaves before the cliff date, they receive nothing. The standard startup cliff is one year, after which a lump portion (often 25%) vests at once.
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