Roth 401(k) vs. 401(k): Comparison and 2026 Limits

Deciding between a traditional 401(k) and Roth 401(k) hinges on factors beyond your current and future tax bracket.

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Updated May 18, 2026 · 2 min read

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The traditional and Roth 401(k) plans are similar to their IRA counterparts, especially when it comes to tax treatment. But deciding which to contribute to – or even if you’d like to split the difference – comes down to more than just present and future tax advantages.

🤓 The big picture

With a traditional 401(k), contributions are taken out of your paycheck pre-tax, lowering your taxable income. You pay taxes in the future when withdrawing in retirement.
Contributions to a Roth 401(k) are made with after-tax dollars, offering no tax break in the present. Qualified withdrawals are tax-free in retirement.
If your employer offers both types of 401(k) plans, you make contributions to both, up to the annual employee limit set by the IRS.

What to know about comparing traditional and Roth 401(k) plans

The main difference between a Roth 401(k) and a traditional 401(k) plan is their tax treatment. Traditional 401(k) contributions come from your paycheck before taxes, lowering your taxable income for the year. Withdrawals in retirement will be taxed at your ordinary income rate.

With a Roth 401(k), contributions are made after-tax. Your taxable income for the year isn’t lowered, but in retirement, you get to withdraw all those contributions and investment earnings tax-free.

How to plan contributions to your 401(k)

There are a few core questions to ask yourself if debating between contributing to a traditional or Roth 401(k):

What tax bracket do you think you’ll be in retirement compared to where you are now? If you’re expecting to be in a higher tax bracket in retirement, Roth is usually the better pick. If you think you’ll be in a lower or similar tax bracket to where you are now, traditional might win out.
Do you want a tax break now? Any traditional 401(k) contribution up to the annual employee limit will decrease your taxable income for the current year.

The case for paying taxes now

If you prefer to pay taxes now, or you think your tax rate will be higher in retirement than it is now, consider a Roth 401(k).

By paying taxes on that money now, you’re shielding yourself from a potential increase in tax rates by the time retirement rolls around. (Keep in mind that your own taxable income may drop when you're retired, potentially putting you in a lower tax bracket.)
You’re also giving yourself access to a more valuable pot of money in retirement: $100,000 in a Roth 401(k) is $100,000, while $100,000 in a traditional 401(k) is $100,000 minus the taxes you’ll owe on each distribution.
However, each Roth 401(k) contribution will reduce your net paycheck by more than a traditional 401(k) contribution will. That's because Roth 401(k) contributions are made after tax rather than before tax.

» MORE: Calculate how long your retirement savings might last

The case for paying taxes in the future

If your primary goal is to reduce your taxable income now or to put off taxes until retirement because you think your tax rate will go down, a traditional 401(k) might work better toward that aim.

Just remember that you’re kicking the taxes down the road to a time when your income and tax rates are both relatively unknown — and might be higher if you advance in your career and start earning more.
If you want the after-tax value of your traditional 401(k) to equal what you could accumulate in a Roth 401(k), you would need to invest the tax savings from each year’s traditional 401(k) contribution. If you can’t or don't want to invest that tax savings — and it could be a considerable amount for those in high tax brackets making maximum contributions — the Roth 401(k) may be a good choice.

» MORE: See our picks for the best wealth advisors

Compare: Roth 401(k) vs. traditional 401(k)

	Roth 401(k)	Traditional 401(k)
Contribution limits	The 401(k) contribution limit applies to both accounts. You can contribute to both accounts in the same year, as long as you keep your total contributions under the cap. You can contribute $24,500 in 2026. People aged 50 and older can contribute an extra $8,000 as a catch-up contribution. Due to the Secure 2.0 Act, those aged 60, 61, 62 and 63 get a higher catch-up contribution of $11,250.
Tax treatment of contributions	Contributions are made after taxes, with no effect on current adjusted gross income. Employer matching dollars must go into a pretax account and are taxed when distributed.	Contributions are made pretax, which reduces your current adjusted gross income.
Tax treatment of withdrawals	No taxes on qualified distributions in retirement.	Distributions in retirement are taxed as ordinary income.
Withdrawal rules	Withdrawals of contributions and earnings are not taxed as long as the distribution is considered qualified by the IRS: The account has been held for five years or more and the distribution is: Due to disability or death. On or after age 59 ½. Unlike a Roth IRA, you cannot withdraw contributions any time you choose.	Withdrawals of contributions and earnings are taxed. Distributions may be penalized if taken before age 59 ½, unless you meet one of the IRS exceptions.

Other considerations

Taxes are important, and they're the primary factor in this debate. But there are other points to consider:

Whether you’re eligible for a Roth IRA. Roth IRAs have income limits, but Roth 401(k)s do not. If you earn too much to be eligible for the Roth IRA, the Roth 401(k) is a chance to get access to the Roth’s tax-free investment growth.
Certain income thresholds in retirement. Taking some of your retirement income from a Roth can reduce the taxes you pay on your Social Security benefits and the cost of your Medicare premiums, both of which are tied to taxable income.
Access to your retirement money. Unfortunately, the Roth 401(k) doesn’t have the flexibility of a Roth IRA; you can't remove contributions at any time. In fact, in some ways it’s less flexible than a traditional 401(k), due to that five-year rule: Even if you hit age 59 ½, your distribution won’t be qualified unless you’ve also held the account for at least five years. That’s something to keep in mind if you’re getting a late start.
Required minimum distributions in retirement. Traditional 401(k)s require account owners to begin taking distributions at age 73, but as of January 2024, Roth 401(k)s do not have required minimum distributions (RMDs). A Roth 401(k) also can easily be rolled into a Roth IRA.

Catch-up contributions as a high earner. Starting in 2026, those age 50 and older with Federal Insurance Contributions Act (FICA)-taxable earnings will have their catch-up 401(k) contributions made on a Roth basis. If you don’t have access to a Roth 401(k) through work, you won’t be able to make catch-up contributions. Other options to consider if you aren't able to contribute to a Roth IRA due to income limitations but still want to boost your retirement savings could be through a nondeductible traditional IRA contribution or backdoor Roth IRA. Note that each come with their own tax considerations.

Finally, remember that you can split the difference and contribute to both accounts — and you can switch back and forth throughout your career or even during the year, assuming your plan allows it. Using both accounts can diversify your tax situation in retirement.

» Want outside help? Learn if a financial advisor can manage your 401(k)

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