How to Cancel a 401(k) Plan: Steps, IRS Rules, and Taxes

Canceling a 401(k) plan means one of two very different things. If you’re an employee who wants to stop contributing, you change a payroll setting to zero and your existing balance stays put. If you’re an employer shutting the whole plan down, you’re running a regulated termination that ends only after every dollar has left the trust and the final IRS and Department of Labor filings are in. Both paths carry tax and timing consequences worth understanding before you start.

Stopping Your Own 401(k) Contributions

To cancel your contributions, log into your employer’s payroll portal or ask HR for a contribution change form and set your elective deferral to zero. Your employer will stop withholding retirement deferrals from future paychecks.

Timing depends on the payroll cycle. Most plans process changes at the start of the next pay period, so one more deduction may still hit before the change takes effect. Ask HR for the exact cutoff so the last withholding doesn’t catch you off guard.

Your take-home pay will rise by whatever you had been deferring, and those extra dollars are fully taxable as wages. The money already in your 401(k) is untouched. It stays invested, you keep receiving statements, and you can restart contributions later.

The Auto-Enrollment Refund Window

If you were automatically enrolled as a new hire and want out quickly, you may be able to pull back the money that was auto-deducted. Plans with an eligible automatic contribution arrangement set a window of somewhere between 30 and 90 days from the first automatic deduction during which you can withdraw those contributions.¹

A refund inside that window counts as taxable income for the year you receive it, but the 10% early withdrawal penalty does not apply. You will forfeit any employer match tied to those automatic contributions, and your employer cannot condition the refund on your agreeing to keep contributing.¹

Terminating an Employer-Sponsored 401(k)

For an employer, ending a 401(k) is a legal event with federal oversight. Start by pulling the plan document and adoption agreement. Those records govern how the plan operates and how it must be wound down. Compile complete records of participant contributions, employer match, vesting schedules, and outstanding loans, and build a census of every person with a balance, including former employees who left money behind. Missing a single account can stall the closing for months.

Most employers use a third-party administrator to run the termination paperwork. Termination fees often fall between $500 and $2,500, depending on plan size and complexity. Legal review, if you hire counsel, is a separate cost.

The Termination Resolution and Notices

The first official step is a corporate action establishing the termination, usually a board resolution or, in a smaller company, a formal plan amendment that sets a specific termination date.² That date triggers full vesting for everyone and starts the clock on distributing assets.

After the resolution is adopted, notify current employees with balances, former employees still in the plan, and any beneficiaries. The notice should cover the termination date, distribution options, and rollover rights. The plan document itself must be formally amended to reflect the termination. If a tax-law change took effect before the termination date but the plan hadn’t been updated for it, those amendments have to be adopted as part of the wind-down.³

Form 5500 and Optional Form 5310

Every 401(k) files annual Form 5500 returns, and that obligation continues until all assets are distributed. Mark the return as the “final return” only in the year the last dollar leaves the trust.⁴ All Form 5500s must be filed electronically through the DOL’s EFAST2 system.⁵

Missing the deadline triggers two penalty tracks. The IRS can assess $25 per day up to $15,000 for a late Form 5500.⁴ The Department of Labor’s ERISA penalty, as of 2025, can run up to $2,739 per day. The DOL side alone can exceed the entire cost of terminating the plan.

Filing Form 5310 is optional. It asks the IRS for a determination letter confirming the plan was qualified at termination, which gives the sponsor stronger footing against a later audit challenge. There is a user fee, and the plan must be fully current on required amendments before the IRS will review it.³

Distributing the Assets

On the termination date, every participant becomes 100% vested in the entire account balance, including employer contributions that hadn’t fully vested under the original schedule.² This is non-negotiable. If a schedule said an employee owned 40% of the match, termination bumps that to 100%.

The plan sponsor then has to pay out every dollar. The IRS treats a plan as terminated only once assets have been distributed “as soon as administratively feasible,” generally within 12 months of the termination date.² Each participant typically chooses among three options:

A direct rollover transfers the balance straight into an IRA or another qualified plan. Nothing is withheld and there is no taxable event.
An indirect rollover sends the participant a check that must be redeposited into an eligible account within 60 days. The plan withholds 20% for federal taxes at payout, and the participant has to replace that 20% from other funds to roll over the full amount tax-free.⁶
A cash distribution pays out directly. The plan withholds 20% for federal income tax and the entire distribution is taxable income for the year.⁶

For every distribution, the plan administrator issues a Form 1099-R to the recipient by January 31 of the following year, reporting the amount paid and the tax withheld.⁷ Once the trust balance is zero and the reporting is filed, the plan is closed and the employer’s fiduciary duties end.

Taxes Participants Should Expect

Plan termination does not exempt you from the 10% early withdrawal penalty. If you take a cash distribution and you’re under 59½, the IRS charges the standard 10% additional tax on top of ordinary income tax.⁸ The fact that your employer forced the plan to close doesn’t create an exception. The only age-based separation exception requires you to have left the job during or after the year you turned 55.

The cleanest way to avoid both the penalty and current taxes is a direct rollover into an IRA or a new employer’s plan. If you take the indirect route, you have exactly 60 days from receiving the check to deposit the funds into an eligible retirement account. Miss it and the entire amount is taxable income, plus the 10% penalty if you’re under 59½.⁶ The IRS can waive the 60-day rule in limited circumstances beyond your control, but that waiver is not something to plan around.

The 20% withholding on indirect rollovers and cash payouts trips up a lot of people. To roll over the full balance, you have to cover that 20% out of pocket and claim the withheld amount back on your tax return.

Outstanding 401(k) Loans at Termination

An unpaid 401(k) loan at termination becomes a plan loan offset, which the IRS treats as an actual distribution. Because the offset was triggered by the termination itself, it qualifies as a “qualified plan loan offset amount,” and you get until your tax filing deadline for that year, including extensions, to roll it over rather than the usual 60 days.⁹

If you don’t roll the offset over by that deadline, the unpaid balance is taxable income, and the 10% early withdrawal penalty applies if you’re under 59½. On a large loan, that can be a surprise bill in the thousands. If your employer announces a termination while you have a loan out, paying it down quickly is the most direct way to limit the damage.

Missing Participants

An employer can’t close the books and ignore accounts belonging to people it can’t locate. Before distributing a missing participant’s balance, the plan administrator has to run a diligent search that, at minimum, includes using a commercial locator service.¹⁰

For balances of $5,000 or less, a DOL safe harbor allows an automatic rollover into an IRA opened on the missing participant’s behalf.¹¹ For larger balances, or when no rollover IRA is available, the administrator may need to send the funds to a state unclaimed property program or use the PBGC’s missing participants program, depending on plan type. Unaccounted-for balances are one of the most common reasons terminations stall.

The 12-Month Successor Plan Restriction

An employer that terminates a 401(k) cannot immediately spin up a replacement. Federal rules prohibit distributing elective deferrals from a terminated 401(k) if the employer maintains or establishes another 401(k) at any time between the termination date and 12 months after all assets have been distributed. In practice, that puts a new 401(k) off the table for roughly a year after the old plan is fully wound down.

The restriction is specific to 401(k) plans, so a SIMPLE IRA, SEP, or 403(b) can be set up during the waiting period. A separate exception applies if fewer than 2% of employees eligible for the terminated plan are eligible for the new one. For most employers hoping to terminate and start fresh, the 12-month waiting period is real and belongs in the timeline from the start.

Partial Terminations From Layoffs

Not every plan closure is voluntary. When an employer lays off a large share of its workforce, the IRS may treat the event as a partial plan termination even without any intent to wind down the 401(k). A turnover rate of 20% or more among plan participants during the relevant period creates a rebuttable presumption that a partial termination has occurred.¹²

For the affected employees, the consequence mirrors a full termination: 100% vesting in their accounts, regardless of the plan’s normal schedule. The employer can try to rebut the presumption by showing the turnover was routine or driven by voluntary departures, but where layoffs were clearly employer-initiated, that argument rarely holds.¹² Companies going through significant downsizing should check the math before assuming their vesting schedules still apply.

1
Internal Revenue Service. FAQs – Auto Enrollment – Can an Employee Withdraw Any Automatic Enrollment Contributions From the Retirement Plan
2
Internal Revenue Service. 401(k) Plan Termination
3
Internal Revenue Service. Instructions for Form 5310 Application for Determination for Terminating Plan
4
Internal Revenue Service. Employee Plans – Learn, Educate, Self-Correct, Enforce – Form 5500 Plan Terminations Without a Form 5310 Filing
5
U.S. Department of Labor. Form 5500 Series
6
Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
7
Internal Revenue Service. General Instructions for Certain Information Returns (2025)
8
Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
9
Internal Revenue Service. Plan Loan Offsets
10
Pension Benefit Guaranty Corporation. Pension Plan Administrators: Finding Missing Participants When Your Plan Terminates
11
U.S. Department of Labor – Employee Benefits Security Administration. Fiduciary Duties and Missing Participants in Terminated Defined Contribution Plans
12
Internal Revenue Service. Partial Termination of Plan