What Does Vested Mean in a 401(k)? Vesting Schedules Explained

Vested means the portion of your 401(k) you get to keep if you quit tomorrow. And here is the part that trips almost everyone up when they ask what does vested mean in a 401(k): every dollar you contributed yourself is 100% vested the second it hits the account. Vesting has nothing to do with your money. It only governs the employer match.

That distinction is the whole subject. Your salary deferrals are legally protected from the moment they leave your paycheck. The match your employer adds on top is conditional, and the condition is time on the job.

Your money is yours. The match is on a clock.

Federal law requires that your own elective deferrals be fully and immediately non-forfeitable. Same for any balance you rolled in from a previous employer's plan. No employer can claw those back, no matter how badly the exit goes.

Employer contributions are the flexible part. Matching contributions, profit sharing, and non-elective contributions can all be tied to a vesting schedule written into the plan document. Until you clear that schedule, part of the match is money that sits in your account, appears on your statement, and is not yours.

The distinction has consequences beyond a job change. Plan loan ceilings are set against the vested balance, not the total, so an unvested match quietly shrinks how much you could borrow from the plan toward a house.

Vesting applies to the growth on the match too, not just the deposits

This is the piece people underestimate. If the match is 60% vested, you keep 60% of the match and 60% of everything that match has earned in the market. The unvested share of the investment gains goes back to the plan alongside the unvested principal.

Click to enlarge

On those assumptions (a $70,000 salary, a 6% deferral, a 4% match, a 7% nominal return), five years of saving produces a $41,763 balance. $25,058 of it is yours unconditionally. The remaining $16,705 is the part that a vesting schedule can reach.

What a 401(k) vesting schedule looks like

A vesting schedule is a table in your plan document that converts years of service into a percentage. That percentage is applied to the employer money in your account. Plans use one of two shapes.

Cliff vesting: nothing, then all of it at once

Under a cliff schedule you own 0% of the match until you hit a specific anniversary, at which point you own 100%. There is no partial credit. A worker at two years and eleven months under a three-year cliff owns none of the match. One month later, they own all of it.

Graded vesting: a slice per year of service

A graded schedule hands you ownership in increments. The slowest version the law allows credits 20% after two years of service and another 20 percentage points each year after that, reaching 100% at six years. You are always partly vested once the schedule starts, and leaving mid-year costs you less than it would under a cliff.

Click to enlarge

Neither shape is uniformly better for the worker. A cliff is more generous for anyone who stays past the cliff date, since they are fully vested at three years while the graded worker is still at 40%. It is brutal for anyone who leaves before it.

The legal maximums

Plans can vest faster than the law requires, and many do. They cannot vest slower. These are the outer limits for a defined contribution plan under IRC 411(a)(2)(B) and the safe harbor rules.

Immediate vesting is common, and safe harbor plan design is one reason: it requires it. Safe harbor structures are adopted most heavily by smaller employers, who use them to sidestep the annual nondiscrimination tests rather than risk failing them. If your plan is a safe harbor 401(k), the match is yours the day it is deposited and none of the rest of this matters to you.

What counts as a year of service

Not a calendar year, and not a year of contributing. The statutory test is 1,000 hours of service in a 12-month computation period. Work 1,000 hours and the year counts, whether you deferred a single dollar or not.

Several details follow from that definition, and they cut in the worker's favor more often than people expect:

• Part-time and reduced-hours years still count as long as you clear 1,000 hours, which is roughly 20 hours a week.
• That threshold falls to 500 hours for long-term part-time employees who enter the plan through the SECURE 2.0 route: two consecutive 12-month periods of at least 500 hours, effective for plan years beginning in 2025. The 500-hour vesting standard stays with them even if they later move to full time.
• Service before you were eligible to join the plan generally counts toward vesting, even though it earned you no match.
• Plans may instead use an elapsed-time method, which measures the calendar period from hire to termination and ignores hours entirely.
• A plan may disregard service performed before age 18.

What happens to your unvested 401(k) when you quit

Termination freezes the clock. Whatever percentage you had earned on your last day is the percentage you keep, and nothing accrues after that.

Mechanically, the account splits three ways:

1. Your deferrals and their growth leave with you. They can be rolled to an IRA or to a new employer's plan, or left in place if the balance is large enough that the plan cannot force you out.
2. The vested slice of the employer match travels with you on the same terms.
3. The unvested slice is forfeited back to the plan, along with the investment gains attributable to it.

That portability is the structural advantage of a defined contribution plan. A pension behaves in the opposite way on departure: it can impose a five-year cliff and then freeze the salary figure the whole benefit is built on.

Forfeited money does not go to your former boss personally. It goes back into the plan, where it is typically used to offset future employer contributions, cover plan administrative expenses, or be reallocated to remaining participants. The forfeiture itself usually happens at the earlier of the date you take a distribution or the point you have five consecutive one-year breaks in service. Many plans also provide that if you are rehired before five consecutive one-year breaks, the forfeited amount is restored, generally on condition that you repay whatever distribution you took on the way out. A worker who was 0% vested took nothing, so has nothing to repay.

The cost of leaving one month early

Because a cliff is a step function, the dollar cost of an exit is discontinuous. Running the same 4%-of-salary match forward month by month makes the shape hard to miss.

Click to enlarge

At month 35 the unvested employer balance is $9,031, and all of it is forfeited. At month 36 the forfeited amount is zero. The graded schedule spreads the same exposure out: its worst month is month 47, at $7,545, and by the end of year five the forfeited amount has fallen to $3,341.

Two things worth noticing on that chart. First, the exposure grows even when the match rate stays flat, because the unvested balance keeps compounding. Second, the cliff is the only schedule where the entire exposure disappears in a single month, which is exactly what makes one date on the calendar carry the whole cost of a job change.

When the vesting schedule stops mattering

Vesting schedules have statutory escape hatches. Reaching the plan's normal retirement age triggers 100% vesting regardless of service. So does a full or partial termination of the plan itself, which means employees caught in a plan shutdown or a large layoff become fully vested in the employer contributions they had been accruing. Whatever ends up fully vested then passes by the beneficiary form rather than by the will, since a plan asset never enters probate.

Being fully vested is not the same as having access

These are separate rules that get confused constantly. Vesting answers who owns the money. Distribution rules answer when you can spend it without a 10% early withdrawal penalty, which is generally age 59½ with a set of narrow exceptions. A 100% vested 28-year-old owns every dollar in the account and still cannot touch it penalty-free. The routes that do exist before then are expensive: a hardship withdrawal is permanent, taxed, and usually penalised on top.

The mechanism in one line

Vesting is a retention device. The employer is paying for tenure, not for the deferral, and the schedule is the instrument that enforces it. That framing explains why the numbers behave the way they do: the match is deferred compensation with a service condition attached, so its value to you is the vested percentage multiplied by the balance, not the balance.

Which means the honest way to read a job offer's match is not "4% of salary." It is 4% of salary times the probability you stay long enough to own it, and under a three-year cliff that probability is doing a great deal of work.