What Are 401(k) Forfeitures and How Are They Used?

A 401(k) forfeiture is the portion of your employer’s contributions that you lose when you leave a job before you’re fully vested. Your own paycheck deferrals are always yours, but matching dollars, profit-sharing contributions, and other employer money vest on a schedule. Walk away too early and the unvested share is pulled out of your account. That money doesn’t go back to your employer. It stays inside the plan and gets used for one of three purposes the IRS allows: paying plan administrative costs, reducing what the employer owes in future contributions, or being redistributed to the accounts of participants who are still there.

When a Forfeiture Happens

Every dollar you contribute from your paycheck is nonforfeitable from day one under federal law.¹ Employer contributions are different. They belong to you only as you vest, and the vesting timetable in your plan document determines how much you actually own on any given day. Leave before you’re 100% vested and the rest becomes a forfeiture.

Plans generally use one of two vesting models, and matching contributions must vest faster than other employer money like profit-sharing.

Cliff Vesting

Under cliff vesting, you own nothing until you hit a service milestone, then you own everything. For employer matching contributions in a defined contribution plan, the longest cliff allowed is three years of service.¹ Leave at two years and eleven months, and you forfeit 100% of the match. Stay one more month and you keep all of it. That all-or-nothing quality makes cliff vesting the biggest source of large forfeitures.

Graded Vesting

Graded vesting hands you ownership in annual increments. For matching contributions, the slowest schedule the law permits looks like this:¹

2 years of service: 20% vested
3 years: 40%
4 years: 60%
5 years: 80%
6 years or more: 100%

Other employer contributions such as profit-sharing can follow a slower schedule that starts vesting at three years and reaches 100% at seven.¹ If your account holds both types, each vests on its own timeline. Someone who leaves after three years under the match schedule above keeps 40% of the match. On a $10,000 employer match, that’s $4,000 you take with you and $6,000 that becomes a forfeiture.

The Retirement-Age Exception

The vesting schedule stops mattering once you reach the plan’s normal retirement age. At that point you’re 100% vested in all employer contributions by law, no matter how few years you’ve worked.² Most plans set that age at 65, though some use an earlier one. So if you started late in your career and would otherwise forfeit most of the match, crossing the plan’s retirement age erases the schedule entirely.

Where the Forfeited Money Goes

Once dollars are forfeited, they sit in a plan-level suspense account until the employer puts them to work. The IRS permits only three uses, and the plan document has to spell out which one applies.³

Paying Plan Administrative Expenses

Running a 401(k) plan involves recordkeeping fees, compliance testing, legal work, and for larger plans, mandatory independent audits. Forfeitures can absorb these costs, which reduces what the employer or the remaining participants would otherwise pay out of pocket. The expense has to be a reasonable cost of administering the plan itself, not a general business expense.

Reducing Future Employer Contributions

This is the most common use. If a company owes $50,000 in matching contributions for a quarter and has $10,000 sitting in its forfeiture account, it can apply that balance against the obligation and contribute $40,000 in new money. Participants still receive their full match. Only the source of the funding shifts. The plan document must authorize the offset.

Reallocating to Remaining Participants

Some plans push forfeitures directly into the accounts of current participants, usually in proportion to compensation. That approach adds dollars to the balances of people who stayed. Plans using this method have to pass nondiscrimination testing so the extra dollars don’t tilt too heavily toward highly compensated employees.⁴

Why the Employer Can’t Just Take the Money Back

A common assumption is that the employer pockets whatever you forfeit. It can’t. Section 401(a)(2) of the tax code prohibits plan assets from being “used for, or diverted to, purposes other than for the exclusive benefit of employees or their beneficiaries.”⁵ This exclusive benefit rule is why forfeitures stay inside the plan trust. Even when they’re used to offset the employer’s contribution obligation, the money never leaves the trust. It funds participant accounts from a different pot.

Getting the Money Back if You’re Rehired

If you leave and later return to the same employer, forfeited money may be recoverable. The controlling rule is the five-consecutive-year break in service. When a former employee is rehired before hitting five consecutive one-year breaks, the plan cannot permanently disregard the prior years of service for vesting purposes.¹

Restoration usually isn’t automatic. If you took a distribution when you left, you typically have to repay the full amount to the plan. Once you do, the employer must restore the forfeited employer contributions to your account, and your earlier service counts toward vesting as though you never left. The repayment window generally runs until the earlier of five years after your rehire date or the end of the first period of five consecutive one-year breaks.⁶

Cross the five-year threshold and the plan can disregard your earlier service entirely. The forfeiture becomes permanent, and the vesting clock starts at zero if you’re rehired after that. Timing matters. Returning a few months before the five-year mark preserves your credit; returning after it doesn’t.

When Forfeitures Don’t Happen at All

Sometimes departing employees keep the full employer match even though they haven’t hit their vesting milestones. When a company runs a large layoff or otherwise sharply reduces its workforce, the IRS can treat the event as a partial plan termination. The working guideline is a turnover rate above 20% of total plan participants in a plan year.⁷

When a partial termination is declared, every affected employee becomes 100% vested in all employer contributions immediately, whatever the schedule would otherwise say.⁷ Full plan terminations trigger the same automatic vesting. If you were let go as part of a sizable workforce reduction, ask whether a partial termination was declared. It may mean you’re entitled to employer contributions you assumed were lost.

1
Office of the Law Revision Counsel. 26 USC 411 – Minimum Vesting Standards
2
Office of the Law Revision Counsel. 29 USC 1053 – Minimum Vesting Standards
3
Internal Revenue Service. Issue Snapshot – Plan Forfeitures Used for Qualified Nonelective and Qualified Matching Contributions
4
Internal Revenue Service. 401(k) Plan Fix-It Guide – The Plan Failed the 401(k) ADP and ACP Nondiscrimination Tests
5
Office of the Law Revision Counsel. 26 USC 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans
6
eCFR. 26 CFR 1.411(a)-7 – Definitions and Special Rules
7
Internal Revenue Service. Retirement Plan FAQs Regarding Partial Plan Termination