A vesting schedule is the timeline that determines when benefits your employer contributes on your behalf become permanently yours. It most commonly governs retirement plan matches in a 401(k) or pension, and equity grants like stock options and restricted stock units. Federal law caps how long that timeline can run for retirement plans; for equity, employers have far more freedom. The practical stakes are simple: leaving a job before you finish the schedule can mean walking away from thousands of dollars your employer already put in your name.
How the Clock Works
Every schedule measures your progress in “years of service.” For most retirement plans, a year of service is a 12-month period in which you work at least 1,000 hours.1eCFR. 29 CFR Part 2530 – Rules and Regulations for Minimum Standards for Employee Pension Benefit Plans The clock starts on your hire date or the date you entered the plan, depending on how the plan document is written. That starting point is your vesting commencement date, and every later calculation runs from it.
One rule overrides the schedule entirely: no matter how many years of service you have, you become 100 percent vested in employer contributions once you reach the plan’s normal retirement age. Federal law defines that age as whichever comes first, the normal retirement age stated in your plan or age 65 (or the fifth anniversary of when you joined the plan, if that’s later).2Office of the Law Revision Counsel. 26 USC 411 Minimum Vesting Standards So a late-career hire can’t have their benefits locked up past retirement.
Part-time workers used to struggle to get any vesting credit because 1,000 hours is hard to hit on a reduced schedule. Starting with the 2025 plan year, the SECURE 2.0 Act changed that: long-term part-time employees who work at least 500 hours in two consecutive years must be allowed into their employer’s retirement plan, and if the employer contributes, those employees earn vesting credit at the 500-hour threshold.
Cliff Vesting and Graded Vesting
Federal law lets employers pick between two shapes. Cliff vesting keeps you at zero percent ownership until a specific anniversary, at which point you jump to 100 percent all at once. Graded vesting parcels ownership out gradually over several years. Employers can always vest employees faster than the federal minimums, and many do; they cannot go slower.
401(k)s and Other Defined Contribution Plans
In a 401(k) or similar defined contribution plan, cliff vesting can last up to three years.2Office of the Law Revision Counsel. 26 USC 411 Minimum Vesting Standards Leave at two years and eleven months and you forfeit every dollar the employer put in. The graded alternative stretches over six years:3Internal Revenue Service. Retirement Topics – Vesting
- 2 years of service: 20 percent vested
- 3 years: 40 percent
- 4 years: 60 percent
- 5 years: 80 percent
- 6 years or more: 100 percent
Under graded vesting, an early departure still leaves you with something. Someone leaving after four years keeps 60 percent of the employer contributions rather than nothing.
Traditional Pensions
Defined benefit plans get a longer maximum. Cliff vesting can run up to five years. Graded vesting runs from three to seven years, starting at 20 percent after three years of service and adding 20 percent each year until you hit 100 percent at year seven.2Office of the Law Revision Counsel. 26 USC 411 Minimum Vesting Standards If your employer offers a pension rather than a 401(k), the timeline before you’re fully vested can be up to two years longer.
Plans That Vest Immediately
Not every plan uses a schedule. Safe Harbor 401(k) plans that are not set up as a Qualified Automatic Contribution Arrangement must vest employer matching contributions immediately. If the Safe Harbor plan is a QACA, employer matches must be fully vested after no more than two years of service.4Internal Revenue Service. Issue Snapshot – Vesting Schedules for Matching Contributions SIMPLE IRA plans and SIMPLE 401(k) plans require that all employer contributions are 100 percent vested when made.5U.S. Department of Labor. SIMPLE IRA Plans for Small Businesses SEP IRAs follow the same rule.
One protection sits across every plan type: money you contribute yourself is always 100 percent vested, instantly and permanently. Whether you make pre-tax deferrals or Roth contributions, federal law prohibits your employer from claiming any ownership of your own salary that you directed into the plan.6Office of the Law Revision Counsel. 29 USC 1053 Minimum Vesting Standards Vesting schedules only govern what the employer contributes.
Vesting for Stock Options and RSUs
Equity compensation runs on different rules. No federal law caps how long a stock option or RSU vesting schedule can last, so employers set their own terms. The most common structure in private companies is a four-year schedule with a one-year cliff: nothing vests in year one, then 25 percent of the grant vests at the one-year anniversary, with the remainder vesting monthly or quarterly over the next three years.
Restricted Stock Units vest on the dates fixed in your grant agreement, and you receive actual shares (or their cash equivalent) on each vesting date. Stock options are different: vesting gives you the right to buy shares at a predetermined strike price, but you still have to exercise the option and pay that price to own the shares.
Equity schedules also sometimes layer in performance conditions. Your grant agreement might tie a portion of the shares to a revenue target, an IPO, or a stock price threshold. These performance requirements sit on top of the time-based schedule, so you can satisfy the time requirement and still not vest if the company misses its target.
What Happens If You Leave Before Vesting
Unvested employer contributions go back to the company. In a retirement plan, the forfeited amounts flow into a forfeiture account and must be used either to fund future employer contributions or to pay plan administrative expenses.7Internal Revenue Service. Issue Snapshot – Plan Forfeitures Used for Qualified Nonelective and Qualified Matching Contributions For stock options and RSUs, unvested shares are canceled and returned to the company’s equity pool.
Your vested balance is permanently yours. You can roll vested retirement funds into a new employer’s plan or into an IRA without owing taxes, as long as you follow the proper rollover procedures.8Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
When Vesting Can Accelerate
Several situations override the normal schedule and vest you sooner than the calendar would suggest.
Plan Terminations
If a company terminates its retirement plan entirely, all participants must become 100 percent vested in their accrued benefits immediately.3Internal Revenue Service. Retirement Topics – Vesting The same idea applies on a smaller scale to partial terminations. When a company reduces its workforce by roughly 20 percent or more in a given period, the IRS presumes a partial plan termination has occurred, and every affected employee must be fully vested in their account balance.9Internal Revenue Service. Partial Termination of Plan The employer can try to rebut the presumption by showing the turnover was routine, but if it can’t, even employees who left voluntarily during that window get full vesting. A lot of people leave money on the table because they don’t realize a mass layoff may have triggered full vesting on contributions they assumed were forfeited.
Mergers and Acquisitions
Equity grants often include acceleration clauses that speed up vesting when the company is acquired. Single-trigger acceleration vests all your unvested equity automatically when the acquisition closes, regardless of whether you keep your job. Double-trigger requires two events: the company must be acquired, and you must be involuntarily terminated or forced into a significant role change within a set window afterward, typically 9 to 18 months. Double-trigger is more common because acquirers don’t want a fully vested workforce that has every reason to walk out on day one.
Amendments to the Schedule
Employers can amend a vesting schedule, but they can’t apply the change retroactively in a way that hurts long-tenured employees. If your plan’s vesting schedule changes and you have three or more years of service, you can elect to keep the old schedule if it’s more favorable to you.2Office of the Law Revision Counsel. 26 USC 411 Minimum Vesting Standards The plan must give you a reasonable period after adopting the amendment to make that election.
How to Find Your Own Schedule
For retirement plans, the Summary Plan Description is the document to request. Federal law requires your plan to provide one, and it will contain a vesting table showing exactly what percentage you own at each year of service, whether the plan uses cliff or graded vesting, and how the plan defines a year of service. Your HR department or plan administrator has to provide it on request.
For equity compensation, your grant agreement spells out the vesting commencement date, the schedule, any performance conditions, and whether acceleration applies during an acquisition or involuntary termination. Most employers provide access through an HR portal or an equity management platform that shows your current vested balance alongside the unvested shares still on the schedule.
If you’re weighing a job change and a cliff date is approaching, do the math before giving notice. The difference between leaving one month before a cliff and one month after can be worth tens of thousands of dollars in forfeited contributions or equity, and it’s a real negotiating point with a prospective employer that wants you to start right away.