A vesting schedule is the timeline that determines when compensation your employer has promised you actually becomes yours to keep. Until an asset vests, it sits on paper and belongs to the company. Once it vests, you own it outright and keep it even if you quit the next day. Vesting shows up most often on equity grants like restricted stock units and stock options, and on employer matching contributions to retirement plans like 401(k)s. The structure your employer picks shapes how much your total pay package is really worth at any given point in your tenure.
How Vesting Works
Every asset subject to vesting is either unvested or vested. Unvested means the employer has allocated it to you but you don’t legally own it yet. Vested means it’s yours, and the employer can’t take it back.
The vesting period is the full stretch of time it takes for a grant to become entirely owned. Within that period, specific vesting dates mark when a new portion transfers to you. If you leave before a vesting date, you keep what has already vested and forfeit the rest.
A concrete example. Your employer grants you 1,000 restricted stock units on a four-year schedule, with 250 shares vesting on each anniversary of the grant date. After two years, you own 500 shares outright. The other 500 remain contingent on your continued employment.
Cliff, Graded, and Performance-Based Schedules
Three structures cover almost everything you’ll encounter. The first two are time-based. The third ties ownership to business results.
Cliff Vesting
Cliff vesting is all-or-nothing for a set initial period. Nothing vests until you reach the cliff date, and then a large chunk vests at once. Leave one day before the cliff and you walk away with zero from that grant.
The most common arrangement in equity compensation is a four-year vesting period with a one-year cliff. During the first twelve months, nothing vests. On your first anniversary, 25% of the grant vests immediately. The remaining 75% then typically vests in equal monthly or quarterly installments over the next three years. The cliff exists to screen out early departures.
For retirement plans, federal law caps cliff vesting at three years for employer contributions to defined contribution plans like 401(k)s. After three years of service, you’re 100% vested in every employer contribution made on your behalf.1Office of the Law Revision Counsel. 26 U.S. Code 411 – Minimum Vesting Standards
Graded Vesting
Graded vesting gives you partial ownership in increments, rewarding each additional year of service. Instead of an all-or-nothing cliff, a growing percentage accumulates over time.
The federal graded schedule for 401(k) employer contributions spans six years. Nothing vests in year one, then 20% vests at year two, 40% at year three, and so on until you reach 100% at year six.2Internal Revenue Service. Retirement Topics – Vesting Leave after three years under this schedule and you keep 40% of your employer’s contributions and forfeit the other 60%.
Equity grants can also use graded vesting. A four-year graded schedule without a cliff might vest 25% annually starting on your first anniversary. Every year of service earns you something, so leaving mid-schedule isn’t a total loss on the unvested portion the way a pre-cliff departure is.
Performance-Based Vesting
Performance-based vesting ties ownership to whether specific business targets are met rather than to time served. Common triggers include hitting a revenue milestone, reaching an earnings-per-share target, completing an IPO, or achieving a defined return on assets. You could work at the company for a decade, but if the target isn’t met, those shares don’t vest.
Many equity plans combine time-based and performance-based conditions. A grant might require both three years of service and the company reaching $50 million in annual revenue, with both conditions satisfied before any shares vest. Performance vesting is most common in executive compensation and at growth-stage companies.
What Gets Vested
Vesting applies to compensation employers use as a retention tool. In practice, that means equity and employer retirement plan contributions.
Equity Compensation
Restricted stock units and stock options are the two most common forms of equity subject to vesting.
With RSUs, you own nothing until the vesting date. When shares vest, the company delivers actual stock to your brokerage account, and the fair market value on that date counts as ordinary income reported on your W-2.3Office of the Law Revision Counsel. 26 USC 83 – Property Transferred in Connection With Performance of Services
Stock options give you the right to buy company shares at a set strike price, but only after the options vest. Two types exist: incentive stock options and non-qualified stock options. Both use vesting schedules, and unvested options can’t be exercised no matter how attractive the price gets.
Employer Retirement Contributions
Money you contribute to your own 401(k) is always 100% vested immediately. Federal law is clear: your own contributions and their earnings belong to you from day one.4Office of the Law Revision Counsel. 29 U.S. Code 1053 – Minimum Vesting Standards
A vesting schedule only applies to what your employer puts in, meaning matching contributions and any profit-sharing contributions. When employees leave before fully vesting, forfeited employer contributions typically get recycled to offset future employer contributions or reallocated to remaining participants.
Federal Limits on 401(k) Vesting
Employers don’t have unlimited discretion over retirement plan vesting. Under IRC Section 411, employer contributions to defined contribution plans like 401(k)s must follow one of two schedules, and the employer can’t make employees wait longer than these limits:
- Three-year cliff: 0% vested until the employee completes three years of service, then 100% vested all at once.1Office of the Law Revision Counsel. 26 U.S. Code 411 – Minimum Vesting Standards
- Two-to-six-year graded: 20% vested after two years, increasing by 20 percentage points each year, reaching 100% after six years.1Office of the Law Revision Counsel. 26 U.S. Code 411 – Minimum Vesting Standards
These are maximums. An employer can always offer faster vesting, and many use immediate vesting as a recruiting advantage. No qualified plan can impose a schedule slower than these federal limits.
Safe harbor 401(k) plans go further and generally must vest employer contributions immediately. These plans skip certain nondiscrimination testing in exchange for meeting specific contribution rules, and immediate vesting is part of the trade. The one exception: plans using a Qualified Automatic Contribution Arrangement can impose a two-year cliff on employer safe harbor contributions.5Internal Revenue Service. Issue Snapshot – Vesting Schedules for Matching Contributions
One more protection worth knowing. If your employer conducts a large enough layoff, federal rules can override your plan’s vesting schedule. When a retirement plan experiences a partial termination, all affected employees become 100% vested in their employer contributions regardless of how long they’ve worked there.6Internal Revenue Service. Partial Termination of Plan The IRS presumes a partial termination has occurred when turnover among plan participants reaches 20% or more during a given period, and the employer carries the burden of rebutting that presumption by showing the turnover was purely voluntary.
What You Keep If You Leave
Your vesting status on your last day is the dividing line between what you take with you and what you forfeit. This is the moment the schedule actually matters.
Anything that has already vested is yours. That holds whether you resigned, were laid off, or were fired for cause. Anything that hasn’t reached its scheduled vesting date goes back to the employer. On a four-year graded equity schedule, leaving after two and a half years means you keep the 50% that vested at your first and second anniversaries and lose the remaining 50%. For retirement plans, your own 401(k) contributions and their gains go with you regardless of tenure; the unvested employer match stays behind.4Office of the Law Revision Counsel. 29 U.S. Code 1053 – Minimum Vesting Standards
Vested stock options come with an extra catch. They don’t automatically convert to shares. You have to actively exercise them, meaning pay the strike price and take delivery of the stock, and most companies give you a limited window after your last day to do it. Three months is the most common timeframe. Let the window close without acting and you lose even your vested options entirely.
For ISOs, the three-month deadline is embedded in the tax code, not just company policy. Exercise an ISO more than three months after leaving (one year if you left due to disability), and it loses its favorable tax treatment and is taxed as a non-qualified stock option instead.7Office of the Law Revision Counsel. 26 U.S. Code 422 – Incentive Stock Options Plenty of departing employees know their options vested, assume they’re safe, and then miss the deadline or don’t realize what waiting costs them.
One more caveat: even vested equity can sometimes be clawed back. Many equity plan agreements include forfeiture provisions triggered by specific conduct after you leave, such as violating a non-compete, soliciting former colleagues, or disclosing confidential information. Enforceability varies significantly by jurisdiction.
Acceleration in an Acquisition
When a company is acquired, unvested equity becomes a major point of negotiation, and how it plays out depends on whether the equity plan includes acceleration provisions.
Single-trigger acceleration means all or some of your unvested equity vests immediately when the deal closes, regardless of whether you keep your job afterward. It’s the more employee-friendly structure. Investors and acquirers tend to resist it because it removes the retention incentive they want during integration.
Double-trigger acceleration requires two events before vesting speeds up: the acquisition must close, and you must be involuntarily terminated (or sometimes experience a significant reduction in pay or responsibilities) within a specified window, typically 9 to 18 months after closing. This protects employees who lose their jobs because of the deal while preserving retention incentives for those who stay.
If your equity plan doesn’t include any acceleration provision, the acquirer generally has several options: assume your existing grants on the same schedule, substitute equivalent grants in the new company’s stock, or cash out the unvested portion. Employees rarely have input. Checking whether your equity agreement includes acceleration language is worth doing before you ever need it, not after you hear acquisition rumors.