Vesting: is the process by which an employee earns full ownership of employer-provided benefits, such as 401(k) matching contributions or stock awards, over time. Money an employee contributes from their own pay is always 100% vested; employer contributions may vest gradually.
Key takeaways
- Employee deferrals are always fully vested.
- 401(k) employer contributions can use a cliff schedule of up to 3 years or graded vesting of up to 6 years.
- Safe harbor matches and contributions must be immediately vested.
- Equity awards, such as RSUs and options, commonly vest over four years with a one-year cliff.
How vesting works
With cliff vesting, an employee owns nothing until a set date, then owns everything. For 401(k) employer contributions, the cliff can't be longer than three years. With graded vesting, ownership increases each year, and the schedule must reach 100% by the sixth year of service (IRS, Retirement topics: vesting).
Employees also become fully vested when they reach the plan's normal retirement age or if the plan is terminated. Unvested amounts that departing employees leave behind are forfeitures, which the plan uses to reduce future employer contributions or pay plan expenses.
Equity follows its own rules set by the company's plan. A typical startup grant vests over four years, with 25% after the first year and the rest monthly or quarterly.
Vesting example
Here's a common six-year graded schedule for a 401(k) match:
| Years of service | Vested percentage |
|---|---|
| Less than 2 | 0% |
| 2 | 20% |
| 3 | 40% |
| 4 | 60% |
| 5 | 80% |
| 6 or more | 100% |
An employee who leaves after four years with $10,000 in employer match keeps $6,000 plus all of her own deferrals. The other $4,000 is forfeited to the plan.
Why vesting matters for employers
Vesting is a retention tool. It rewards people who stay, which matters when median tenure has fallen to 3.9 years (BLS, median employee tenure, January 2024). But overly long schedules can backfire in recruiting, because candidates compare how quickly they'll own the match.
Vesting also creates recordkeeping duties. Payroll must track hours or years of service accurately, and the recordkeeper must apply the right schedule when employees leave. Errors are a frequent finding in plan audits and can require corrective contributions.
Common vesting mistakes to avoid
Using the wrong service definition
Plans count service by hours or elapsed time. Payroll data must match the plan document.
Forgetting rehire rules
Rehired employees may get credit for prior service.
Applying vesting to safe harbor contributions
Safe harbor contributions must vest immediately.
Not using forfeitures
Forfeitures must be used within plan deadlines, not left sitting in the account.
Vesting: questions people also ask
What does fully vested mean?
What is a vesting schedule?
What happens to unvested 401(k) money when I leave?
What is cliff vesting?
Are my own 401(k) contributions vested?
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HRTally glossary entries are written by people who have run US payroll, benefits, and HR operations, then checked line by line against primary sources such as the IRS, Department of Labor, EEOC, and Bureau of Labor Statistics. Dollar limits and rates are for 2026 unless stated. We review every entry at least twice a year and whenever a rule changes. This page explains general rules and isn't legal or tax advice; state law can differ. Read our editorial standards.
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<blockquote>Vesting is the process by which an employee earns full ownership of employer-provided benefits, such as 401(k) matching contributions or stock awards, over time. Money an employee contributes from their own pay is always 100% vested; employer contributions may vest gradually.</blockquote><p>Source: <a href="https://www.hrtally.com/hr-glossary/vesting/">HRTally HR Glossary, Vesting</a></p>
Written by the HRTally Research Team
Our guides are written and reviewed by people with hands-on US HR, payroll, and HR technology experience. Legal and tax facts are checked against primary sources, such as the Department of Labor, IRS, EEOC, and USCIS, and linked at the end of each guide. Vendors never review or pay for our editorial content.