Roth 401(k): How It Works and How It Differs From a Roth IRA
A Roth 401(k) lets you save for retirement through your employer’s retirement plan with after-tax dollars. You pay taxes on the money now, and qualified withdrawals in retirement are tax-free, including the investment earnings.
It can be a strong tool for retirement savings. This guide is for workers whose 401(k) offers a Roth option and who want to know how it works, what it allows in 2026, and how it compares with a traditional 401(k) and a Roth IRA.
What is a Roth 401(k)?
A Roth 401(k) is a Roth feature inside a regular 401(k) plan, an employer-sponsored retirement plan. The Internal Revenue Service calls it a designated Roth account, and the money you put in is a designated Roth contribution. It is not a separate plan; it is a separate account within your employer’s plan.
Roth 401(k) contributions use after-tax dollars
Traditional 401(k) contributions are pre-tax: they come out of your pay before income taxes, so they lower your current taxable income. Roth 401(k) contributions come out of after-tax income. You get no immediate tax break, but your money can grow tax-free.
Roth 401(k) deferrals are after-tax contributions in the plain sense, sometimes called post-tax contributions. They are different from the separate after-tax (non-Roth) contributions some retirement plans allow above the deferral limit.
Roth options in other workplace retirement plans
A 403(b) or governmental 457(b) workplace retirement plan can offer the same kind of Roth account. Not all retirement plans include a Roth option; your employer decides. If yours does, you choose Roth, traditional, or a mix, generally through regular payroll deductions from the eligible compensation your plan defines.
How a Roth 401(k) works
You pay taxes now, not later
With a Roth 401(k), you pay taxes on the money in the year you earn it. Your employer withholds income taxes on the full paycheck, then sends your Roth 401(k) contributions to the plan. In exchange, qualified withdrawals later come out tax-free.
Qualified withdrawals are tax-free
A qualified distribution from a Roth 401(k) is not included in your gross income, the Internal Revenue Service says. That means tax-free qualified withdrawals of both your contributions and the investment earnings. A distribution is qualified if you have met the 5-year rule and it is made:
- On or after the date you reach age 59½
- After your death, to your beneficiary
- Because you are disabled
The 5-year rule
The 5-year period starts on the first day of the tax year in which you first make designated Roth contributions to the plan. It ends after five consecutive tax years. If you take money out before then, the withdrawal is nonqualified.
For a nonqualified distribution, the earnings portion is taxable as ordinary income. The IRS example: from a $10,000 account holding $9,400 of contributions and $600 of earnings, a $5,000 withdrawal is $4,700 contributions and $300 taxable earnings. A 10% additional tax may also apply to the taxable part before 59½.
Roth 401(k) contribution limits for 2026
The Roth 401(k) shares contribution limits with the traditional 401(k). For 2026, the IRS limit on employee contributions is $24,500, up from $23,500 in 2025. That is a combined limit: your pre-tax and Roth 401(k) deferrals together can’t exceed $24,500, even across more than one 401(k) or 403(b) plan.
Catch-up contributions
Catch-up contributions let workers 50 and older save more, and Roth 401(k) catch-up contributions follow the same limits. For 2026:
- Age 50 or older: an extra $8,000, for $32,500 in total
- Age 60, 61, 62, or 63: a higher catch-up of $11,250, for $35,750
Starting in 2026, if your prior-year wages from the employer were over $150,000, your catch-up contributions generally must go in as Roth. The IRS ties this to the wages that employer paid you in 2025. Your total 401(k) contribution limits for the year don’t change.
No income limits or income restrictions
A Roth 401(k) has no income limits. The IRS Roth comparison chart says there is “no income limitation to participate,” so high earners can save in a Roth 401(k) even if their income is too high for a Roth IRA. Unlike Roth IRAs, there are no income restrictions based on modified adjusted gross income or filing status.
Employer match and employer contributions
Your employer match works the same way whether you choose Roth or traditional deferrals. Traditionally, employer matching contributions go into a pre-tax account, even when they match your Roth 401(k) contributions. You pay income taxes on that money, and its earnings, when you withdraw it.
Since SECURE 2.0, a plan may let you choose to treat vested matching contributions as Roth. If you do, the match counts as taxable income in the year it goes into your account. Employer contributions don’t count toward your $24,500 limit, but employee contributions and employer contributions together are capped at $72,000 for 2026, not counting catch-ups.
Some plans also allow after-tax contributions above the deferral limit that can be converted to Roth, the mega backdoor Roth.
Roth 401(k) vs traditional 401(k)
Both accounts have the same limits, employer match, investment options, and loan and hardship rules, if your plan offers them. The difference is tax timing. Both offer tax benefits; the Roth 401(k)’s tax advantages arrive in retirement, while a traditional 401(k)’s arrive now. That different tax treatment is the whole decision.
|
Roth 401(k) |
Traditional 401(k) |
|
|---|---|---|
|
Contributions |
After-tax dollars |
Pre-tax dollars |
|
Tax savings |
Later: tax-free qualified withdrawals |
Now: lower taxable income |
|
Withdrawals |
Tax-free if qualified |
Taxed as ordinary income |
|
Lifetime RMDs |
None since 2024 |
From age 73 |
Pre-tax vs Roth: the immediate tax break
A traditional 401(k) gives you an up-front deduction on a pre-tax basis. A Roth 401(k) gives up that deduction for tax-free growth and tax-free withdrawals. The IRS chart notes traditional 401(k) withdrawals are subject to federal and most state income taxes.
Comparing tax brackets now and later
The choice turns on tax rates. If you are in a lower tax bracket now than you expect in retirement, Roth 401(k) saving may come out ahead. If you are in a higher tax bracket now and expect a lower tax bracket later, pre-tax contributions may win. Nobody knows future tax rates. Income tax rates and tax laws can change, so many savers hedge by using both.
Roth 401(k) vs Roth IRA
A Roth IRA is an individual retirement account you open yourself. Both Roth accounts are funded with after-tax dollars and share the same core tax benefits: earnings that grow tax-free and tax-free qualified withdrawals. The contribution limits differ most. Neither has required minimum distributions for the owner. Here is how they differ for 2026.
|
Roth 401(k) |
Roth IRA |
|
|---|---|---|
|
Who offers it |
Your employer |
You open it |
|
2026 limit |
$24,500 (plus catch-up) |
$7,500 ($8,600 at 50+) |
|
Income limits |
None |
Phase-out applies |
|
Employer match |
Possible |
No |
|
Investment options |
Plan menu |
Broad |
|
Lifetime RMDs |
None |
None |
Roth IRA income limits
Roth IRA income limits apply only to the IRA. For 2026, the ability to make Roth IRA contributions phases out between $153,000 and $168,000 of modified adjusted gross income for single filers, and between $242,000 and $252,000 for married couples filing jointly. Higher earners sometimes use a backdoor Roth IRA instead.
Withdrawals and penalty-free access
A Roth IRA is more flexible. You can withdraw your regular Roth IRA contributions at any time, tax-free and penalty-free. A Roth 401(k) doesn’t separate contributions that way. A nonqualified withdrawal is part contributions and part earnings, and your plan may limit withdrawals while you work. Some plans allow loans or hardship withdrawals from a Roth 401(k).
A qualified Roth IRA distribution can also include a first-home purchase, which the Roth 401(k) rule does not list.
Roth 401(k) RMDs: none for the account owner
Beginning in 2024, Roth 401(k) accounts are no longer subject to required minimum distributions while the account owner is alive. The IRS says RMD rules “do not apply to Roth IRAs or Designated Roth accounts while the owner is alive.” Beneficiaries are still subject to the RMD rules.
Before 2024, Roth 401(k) owners had to take RMDs. Pre-tax 401(k) money still has required minimum distributions starting at 73. See our required minimum distributions guide.
Moving a Roth 401(k) into individual retirement accounts
When you leave a job, you can generally roll a Roth 401(k) into a Roth IRA with a direct rollover. The time the money spent in the Roth 401(k) doesn’t count toward the Roth IRA’s own 5-year clock. If you already had a Roth IRA for five years, that earlier start date applies. Our 401(k) to IRA rollover guide covers the steps.
Is a Roth 401(k) better than a regular 401(k)?
Neither is better for everyone. A Roth 401(k) often suits younger workers, people in a low tax bracket now who expect a higher tax bracket later, and savers who want tax-free retirement income. A traditional 401(k) often suits people in their peak earning years who want the deduction now. Your tax situation and financial circumstances decide.
Is it good to have both a 401(k) and a Roth 401(k)?
Often, yes. You can split your contributions between traditional and Roth in the same plan, within one $24,500 limit. Holding both gives you a mix of taxable and tax-free money in retirement, so you can manage your tax bracket each year. That flexibility is a real benefit for long-term retirement savings.
What is the downside of a Roth 401(k)?
You lose the up-front deduction, so your paycheck is smaller for the same retirement savings. If your tax rate is lower in retirement, you may pay more tax overall. Matching contributions are usually pre-tax, so not all the money in the plan is tax-free. Your plan’s investment options may be limited, for example to a few stock and bond funds.
Roth 401(k) FAQ
Can I contribute to a Roth 401(k) and a Roth IRA?
Yes. The contribution limits are separate, and the IRS allows both in the same year, as long as you qualify under the Roth IRA income limits. In 2026, a worker under 50 could put $24,500 in a Roth 401(k) and $7,500 in a Roth IRA. Our Roth IRA guide explains Roth IRA contributions.
Can I convert pre-tax 401(k) money to Roth?
If your plan allows in-plan Roth rollovers, yes. The amount converted counts as taxable income that year, and it can’t be undone. See our Roth conversion guide.
Do Roth 401(k) contributions count for the Saver’s Credit?
Yes. Roth 401(k) deferrals count as elective deferrals for the Saver’s Credit, if you meet the income and other rules.
The bottom line
A Roth 401(k) trades a tax break now for tax-free withdrawals later, with the higher 401(k) limits and no income limits. For many workers, it belongs in a retirement savings plan alongside pre-tax money. Compare it with a Roth IRA in our Roth IRA vs 401(k) guide, and with the traditional side in traditional IRA vs 401(k). For more account guides, visit our IRA investing home page.
Written by Tim Schmidt and reviewed for tax accuracy by Sean Webster, CPA. Last reviewed November 10, 2026 (America/New_York). This guide is for general education. It is not tax, legal, or investment advice. IRAInvesting.com is not a custodian, broker-dealer, or investment adviser. Contribution limits change each year, and plan features vary. Before you act, talk with a tax professional or tax advisor who can review your situation. Investing involves risk, including the possible loss of principal.