Vesting

How vesting schedules work

Vesting answers one question: if this person leaves today, how much of what the employer put in do they keep? Retirement plans, equity grants, some retention and sign-on bonuses, and certain pension benefits all use vesting.

Two shapes cover most schedules:

• Cliff vesting. Nothing vests until a set date, then everything does. A three-year cliff on a 401(k) match means 0% at two years and 11 months, then 100%.
• Graded vesting. Ownership builds in steps, for example 20% a year from year two to year six.

Some plans use immediate vesting, which means employer money belongs to the employee from day one. Safe harbor 401(k) contributions generally must vest immediately (a qualified automatic contribution arrangement can use a two-year cliff instead).

Federal limits for retirement plan vesting

For defined contribution plans such as a 401(k), ERISA and the tax code set the slowest schedules allowed for employer contributions:

• 3-year cliff: 0% until three years of service, then 100%
• 6-year graded: 20% after two years, then 20% more each year, reaching 100% at six years

Employers can vest faster but not slower. A defined benefit plan can use up to a 5-year cliff or 3-to-7-year graded schedule. A year of service is commonly defined as a plan year with at least 1,000 hours worked, which matters for part-time and variable-hour staff. Employees become fully vested when they reach normal retirement age, and a plan termination or a partial termination (often presumed when more than 20% of participants are let go in a year, for example in a large layoff) triggers full vesting for affected participants.

Equity vesting

Stock options and restricted stock units follow their own rules, set in the grant agreement rather than by ERISA. The common pattern at US tech and growth companies is four years with a one-year cliff: 25% vests at the first anniversary, then the rest monthly or quarterly. Some companies back-load (for example 10%, 20%, 30%, 40%) or use annual refresh grants that start their own schedules. See equity compensation for how options and RSUs differ in tax treatment.

Acceleration clauses change vesting on events. Single-trigger acceleration vests shares on a sale of the company; double-trigger requires both a sale and a termination without cause. They are common for executives and rare for broad-based grants.

Vesting period and retention

Vesting is a retention tool, but a blunt one. Cliffs create a predictable spike in resignations right after the date passes; people who were already unhappy wait for the cliff, then leave. Graded schedules spread that out. For high-turnover hourly roles, long vesting on a 401(k) match mostly means forfeitures that reduce plan costs, and it rarely changes behavior because most people do not know their vesting date.

If you want vesting to influence retention, tell people about it. Put the next vesting date and the dollar amount on pay statements or total rewards statements. A note that says "$1,840 of your match vests on March 1" works better than a plan document no one reads. Pair it with the rest of your employee retention work rather than relying on it alone.

Common mistakes

• Counting service wrongly for rehires. Plan rules on breaks in service often require restoring prior years.
• Applying vesting to employee deferrals, which is never allowed.
• Forgetting full vesting in a partial plan termination after a large reduction in force.
• Not telling candidates about vesting in offers, then losing trust when they learn the match is not theirs for three years. Recruiters should quote the schedule.

Plan documents and grant agreements control the details, and tax rules change, so confirm specifics with your plan administrator.