What Is a Roth 401(k)? Taxes, Limits, and Withdrawals

A Roth 401(k) is an employer-sponsored retirement account you fund with after-tax dollars from your paycheck, so you pay income tax on the money going in and owe nothing on qualified withdrawals later. For 2026, you can defer up to $24,500 of your own pay, with extra catch-up room if you’re 50 or older, and there is no income limit that shuts high earners out. The account was created by the Economic Growth and Tax Relief Reconciliation Act of 2001 and has been available in plans since 2006.

How the Taxes Work

Your contributions come out of your paycheck after federal and state income taxes have already been withheld. You get no deduction for the money going in, which is the opposite of a traditional 401(k). In exchange, everything inside the account grows without an annual tax bill on dividends, interest, or capital gains, and qualified withdrawals of both your contributions and their earnings come out tax-free. Internal Revenue Code Section 402A sets the framework for these designated Roth accounts and provides that qualified distributions are excluded from gross income.¹

The trade-off is simple: pay tax at today’s rate to lock in tax-free treatment on decades of growth. If you expect to be in a higher bracket later, or if you simply want the certainty of a fixed tax outcome, the Roth side of the plan does that work.

What Counts as a Tax-Free Withdrawal

Two conditions have to be met at the same time. The account must have been open for at least five tax years, and you must be at least 59½, permanently disabled, or the money must be paid to a beneficiary after your death. Meet both and the withdrawal is a qualified distribution: entirely tax-free. Miss either and the earnings portion becomes taxable, and a 10% early distribution penalty may apply on top.²

The five-year clock starts on January 1 of the tax year of your first designated Roth contribution to that employer’s plan. Contribute for the first time in October 2024 and the clock started January 1, 2024, running through the end of 2028. Each employer’s plan runs its own clock. Change jobs and open a fresh Roth 401(k) at the new employer, and that new plan starts a new five-year count.²

Non-Qualified Withdrawals

Pull money out before you meet both conditions and the IRS doesn’t tax the entire amount. Each dollar is treated as a pro-rata mix of your contributions (already taxed) and earnings (not yet taxed), in the same ratio as the whole account. If the account holds $9,400 in contributions and $600 in earnings, roughly 94% of the withdrawal is a tax-free return of contributions and 6% is taxable earnings.²

The 10% early distribution penalty under IRC Section 72(t) applies to the taxable earnings portion if you’re under 59½ and no exception covers you. Exceptions include permanent disability, distributions to a beneficiary after death, and a series of substantially equal periodic payments. Your own contributions are never taxed again on withdrawal, because you already paid income tax on them.

2026 Contribution Limits

The employee deferral limit for 2026 is $24,500.³ That ceiling covers all of your 401(k) deferrals combined, traditional and Roth. You can split the $24,500 between the two types in any proportion, but the total can’t exceed it.

Workers 50 and older can add an $8,000 catch-up in 2026, bringing the maximum employee deferral to $32,500. SECURE 2.0 introduced a higher catch-up limit for a narrow age band: if you turn 60, 61, 62, or 63 during 2026, the catch-up rises to $11,250 for a total of $35,750.³ At 64 the catch-up drops back to $8,000.

A separate ceiling under Section 415(c) caps the total that can go into your account from all sources, including employer matching. For 2026 that overall limit is $72,000, or $80,000 with the standard catch-up. Most participants never approach it.

If your deferrals across all employers exceed the annual limit, you need to pull the excess and any earnings on it out of the plan by April 15 of the following year. A timely correction taxes the excess in the year it was deferred and the earnings in the year they’re distributed.⁴ Miss the deadline and the excess is taxed twice: once when contributed and again when eventually withdrawn.⁵

Employer Matching

Historically, an employer match always went into a pre-tax bucket even if you chose the Roth option for your own deferrals. That meant the match and its growth were fully taxable in retirement, creating a split-tax account.

SECURE 2.0 lets employers designate matching and nonelective contributions as Roth. If your employer offers a Roth match, the full value of the match is included in your taxable income for the year it hits the account.⁶ In practice many employers still default to the pre-tax match because it’s simpler to administer, but the Roth option is increasingly available.

No Income Limits

A Roth IRA phases out for single filers with modified adjusted gross income between $153,000 and $168,000 in 2026, and for joint filers between $242,000 and $252,000. Earn above those ranges and you can’t contribute directly to a Roth IRA at all.⁷

The Roth 401(k) has no such phase-out. Whether you earn $50,000 or $500,000, you can defer the full amount as long as your employer’s plan offers the option. For high earners it’s the most straightforward way to get money into a Roth account. Participation runs through a payroll deferral election with your plan administrator, and contributions are withheld each pay period automatically.

No More Required Minimum Distributions

Before SECURE 2.0, a Roth 401(k) was subject to required minimum distributions starting at age 73, unlike a Roth IRA. That forced participants either to take money they didn’t need or to roll the balance into a Roth IRA to avoid the requirement. SECURE 2.0 eliminated lifetime RMDs from designated Roth accounts in employer plans for tax years starting in 2024.¹ The account can now sit untouched for your entire lifetime, compounding tax-free, and beneficiary distribution rules take over at death.

Rolling a Roth 401(k) Into a Roth IRA

When you leave an employer you can roll a Roth 401(k) directly into a Roth IRA without triggering tax, since both hold after-tax dollars. A direct rollover from institution to institution avoids the 20% mandatory withholding that applies when a distribution is paid to you first.

Watch the five-year clock. Your holding period in the employer plan does not transfer. Once the money lands in a Roth IRA, that IRA’s own five-year clock governs everything in it. If you already have any Roth IRA that’s been open at least five years, the rolled-over funds pick up its aging immediately. If the receiving Roth IRA is new, the five-year period starts fresh, even if your Roth 401(k) had been open for a decade.² The workaround is to open and fund a Roth IRA early, even with a small amount, so the clock is already running before you ever need to roll anything over.

Loans and Hardship Withdrawals

Most 401(k) plans allow loans, and Roth 401(k) balances are generally eligible. The federal limit is the lesser of $50,000 or 50% of your vested balance, with a $10,000 minimum available if half of your balance falls below that. Loans typically must be repaid within five years through at least quarterly payments, though loans used to buy a primary residence can run longer.⁸

Hardship withdrawals are separate and require an immediate and heavy financial need. The IRS recognizes several safe-harbor categories that automatically qualify:

Unreimbursed medical expenses for you, your spouse, dependents, or beneficiary
Costs directly related to buying your principal residence, not counting mortgage payments
Tuition, fees, and room and board for the next 12 months of postsecondary education
Payments needed to prevent eviction or foreclosure on your principal residence
Funeral expenses for you, your spouse, children, dependents, or beneficiary
Certain expenses to repair damage to your principal residence

A hardship withdrawal cannot be repaid to the plan. If you haven’t met the five-year and age requirements for a qualified distribution, the earnings portion is taxable, and the 10% early distribution penalty may also apply.⁹

Mandatory Roth Catch-Up for Higher Earners in 2027

Starting with the 2027 tax year, SECURE 2.0 requires certain higher-income participants to make their catch-up contributions exclusively as Roth deferrals. If your wages from the employer in the prior year exceeded the income threshold, the catch-up portion can no longer go into the traditional pre-tax side of the plan and must go into the Roth side instead.¹⁰

The final IRS regulations allow plan administrators to aggregate wages from certain related employers when checking whether you hit the threshold. If you’re below it, nothing changes and you can still split catch-up money between traditional and Roth however you want. The rule affects the catch-up portion only; your regular deferrals up to $24,500 remain your choice regardless of income.

1
Office of the Law Revision Counsel. 26 USC 402A – Optional Treatment of Elective Deferrals as Roth Contributions
2
Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts
3
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
4
Internal Revenue Service. 401(k) Plan Fix-It Guide – Elective Deferrals Werent Limited to the Amounts Under IRC Section 402(g) for the Calendar Year and Excesses Werent Distributed
5
Internal Revenue Service. Consequences to a Participant Who Makes Excess Annual Salary Deferrals
6
Internal Revenue Service. SECURE 2.0 Act Impacts How Businesses Complete Forms W-2
7
Internal Revenue Service. Roth Comparison Chart
8
Internal Revenue Service. Retirement Topics – Plan Loans
9
Internal Revenue Service. Retirement Topics – Hardship Distributions
10
Internal Revenue Service. Treasury, IRS Issue Final Regulations on New Roth Catch-Up Rule, Other SECURE 2.0 Act Provisions