Roth 401(k) Rules

A Roth 401(k) is a Roth account inside an employer retirement plan. You pay income tax on your contributions now; qualified withdrawals, including earnings, are tax-free. In 2026, Roth and pre-tax employee deferrals share a $24,500 limit before catch-ups. There is no Roth IRA-style income phase-out, but your plan must offer the feature and you must be eligible to participate.

2026 contribution limits: one employee ceiling, not two

The larger ages-60–63 catch-up replaces the ordinary catch-up; it does not stack on top. It is optional for a plan to offer the higher amount. These exact 2026 figures come from IRS Notice 2025-67. Do not calculate the higher catch-up as 150% of the current $8,000 amount.

Example: $15,000 in Roth deferrals leaves $9,500 of the regular $24,500 limit for pre-tax deferrals—not another $24,500. Deferrals to multiple 401(k) employers generally share your personal annual ceiling too. A change of jobs does not reset it.

Employer contributions do not use that employee-deferral ceiling, but they are not unlimited. Regular employee deferrals, employer contributions and employee non-Roth after-tax contributions generally share the lesser of $72,000 or 100% of compensation annual-additions limit for 2026. Qualifying catch-ups sit outside that limit. Related-employer aggregation, plan terms and other limits can also matter.

A personal IRA has a separate limit. A Roth IRA contribution still needs qualifying compensation and must satisfy its income rules; a Roth 401(k) has no comparable MAGI phase-out. See Roth IRA contribution limits.

Where does the employer match go?

Choosing Roth for your own pay does not automatically make your employer's match Roth. A pre-tax match remains in a separately tracked pre-tax balance. Under SECURE 2.0 section 604, a plan may also let you designate fully vested matching or nonelective employer contributions as Roth. That designation adds the amount to your income for the year it is allocated; it is not a tax-free employer gift. See Notice 2024-2, section L.

A simple rollover example: suppose you have $25,000 in the designated Roth account and $6,000 of pre-tax employer match. If an eligible distribution is available, the Roth money can roll directly to a Roth IRA. The match can roll to a Traditional IRA without current tax, or to a Roth IRA as a generally taxable conversion. Whether you can move only part of the account depends on the plan. Separate tax accounting does not mean both balances must always move together.

Withdrawals: access first, tax treatment second

Your plan may allow distributions after separation from service, at age 59½ while still employed, or for hardship and other permitted events. Check its rules. A hardship provision creates access; it does not, by itself, make the distribution tax-free or waive an early-distribution tax.

For a regular distribution to be qualified, five tax years must have passed since the start of your designated Roth participation period, and the payment must be made after age 59½, after death, or because of qualifying disability. Separation from employment is not an extra qualification requirement.

The clock normally starts January 1 of the tax year of your first designated Roth contribution to that plan. A first contribution for 2024 means the five-year period is complete on January 1, 2029. A qualifying direct rollover from another designated Roth plan can carry an earlier starting year. Opening an empty account does not start the clock.

If the distribution is not qualified, it generally contains a proportional share of contributions and earnings. Your already-taxed contributions are not taxed again; the earnings portion is taxable and may face the 10% additional tax unless an exception applies. Unlike a Roth IRA, you cannot simply choose to withdraw contributions first.

Loans are possible. A plan may allow a loan from its designated Roth account under the same loan rules that apply to its other accounts. Availability, borrowing limits and repayment terms depend on the plan and tax rules. A loan that fails those rules can become a taxable distribution. A Roth IRA, by contrast, cannot make a participant loan. The IRS designated Roth FAQs address loans, hardship access and distribution taxation.

No lifetime RMDs for the Roth 401(k) owner

SECURE 2.0 section 325 removed required minimum distributions from designated Roth accounts during the owner's lifetime starting in 2024. There is no balance threshold. A distribution already required for 2023 was not erased just because its payment deadline fell in 2024.

Beneficiaries still have distribution rules. Many non-spouse beneficiaries fall under a ten-year deadline, but spouses and other eligible designated beneficiaries can have different options; plan terms matter too. Do not apply one inherited-account schedule to everyone. See the IRS RMD overview and our inherited Roth guide.

Roth 401(k) versus Roth IRA

Before rolling a Roth 401(k) to a Roth IRA

A rollover is an option to compare, not an automatic upgrade. Look at both accounts' fees, investments, withdrawal rules, loan availability and creditor protections. Neither account requires lifetime RMDs from the Roth owner. Leaving the employer does not automatically make an IRA the better choice.

The clock can change. Time in the Roth 401(k) does not count toward a Roth IRA's five-tax-year qualification period. An earlier Roth IRA contribution may already have started that clock. If you have no earlier Roth IRA, a rollover in 2026 generally starts that IRA clock on January 1, 2026.

The rollover itself can be tax-free even when an immediate later IRA withdrawal is not fully tax-free. If the plan distribution was qualified, the whole amount rolled into the Roth IRA is treated as basis. If it was nonqualified, only the plan's contribution basis carries over as basis; its earnings remain earnings. Keep the plan's basis records and apply the Roth IRA ordering rules before taking money out. See Publication 590-A, rollovers from designated Roth accounts.

2026 Roth catch-ups: whose wages, which year?

Under SECURE 2.0 section 603, a participant with more than $150,000 in 2025 wages from the relevant employer generally must make 2026 catch-up contributions as Roth. Exactly $150,000 does not exceed the threshold. This is a workplace catch-up rule—not a rule that forces all regular deferrals, or personal IRA contributions, to be Roth.

The final regulations are T.D. 10033, published September 16, 2025—not T.D. 10007. They took regulatory effect November 17, 2025 and generally apply to contributions in taxable years beginning after December 31, 2026. That later regulatory applicability date does not extend Notice 2023-62's general 2024–2025 transition relief. Plans generally apply the statute in 2026 using a reasonable, good-faith interpretation.

• Not household income or IRA MAGI: the final regulations use prior-year Social Security wages, generally W-2 box 3. Before their applicability date, the IRS also permits use of Medicare wages under the good-faith standard.
• Not a blanket job-changer exemption: the test generally concerns the employer sponsoring the plan, but the regulations permit specified related-employer/common-paymaster aggregation and certain predecessor-employer wages. Ask how your plan handles an employer change; do not add together all unrelated jobs automatically or assume none can be combined.
• Self-employment is different: self-employment earnings alone are not the FICA wages used for this test. S-corporation W-2 wages can count. Someone who becomes a partner can still be affected by prior-year employee wages from that employer.
• Special plans need a separate timing check: governmental and collectively bargained plans have special regulatory applicability rules; certain multiemployer plans also receive deemed-compliance relief tied to bargaining agreements. These are not a universal extension for every worker.
• No Roth feature: where the requirement applies, an affected participant cannot substitute a pre-tax catch-up. The plan needs a Roth route for that participant to make catch-up contributions.

Confirm the wage measure, applicable transition rules and available election with your plan administrator. T.D. 10033, section 1.414(v)-2 contains the employer and timing details. The catch-up amount and the requirement to make it Roth are separate questions.

Roth is after-tax—but not all after-tax contributions are Roth

Pre-tax deferrals generally reduce current federal taxable wages; later withdrawals are generally taxable. Designated Roth deferrals do not reduce those wages and share the employee-deferral limit. Non-Roth after-tax contributions are a different plan feature: they build contribution basis, but their earnings are generally taxable when distributed unless rolled to a tax-deferred account. Moving those earnings to Roth generally creates conversion income.

A “mega backdoor Roth” uses that separate non-Roth after-tax feature followed by a permitted in-plan Roth conversion or rollover to a Roth IRA. The plan must support the necessary contribution and conversion/distribution steps. A Roth 401(k) option alone is not enough.

For eligible distributions containing both pre-tax and after-tax amounts, IRS allocation rules can permit the after-tax amount to go to a Roth IRA and the pre-tax portion to a Traditional IRA. Do not assume a payment lets you select only basis without considering its accompanying pre-tax amount. See IRS guidance on after-tax rollovers.

Frequently asked questions

Corrections and updates

September 23, 2026 — Correction: Corrected the shared Roth/pre-tax employee limit, plan-permitted loans and hardship access, and the distinction between withdrawal access and tax-free qualification. Corrected employer-match and rollover treatment, beneficiary qualifications, and the authority, employer-wage test and timing for Roth catch-ups. Replaced insufficiently specified growth projections with explicit contribution-room and withdrawal examples. Correction record.