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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteChoose a traditional 401(k) when the value of its tax break now is more important than the tax you expect to owe on withdrawals; choose a Roth 401(k) when paying tax on contributions now is likely to be preferable to paying tax on withdrawals later. If you cannot confidently predict future tax rates, splitting contributions between the two can spread the tax treatment of your retirement income. Neither option is universally better.
How traditional and Roth 401(k) taxes differ
The key difference is when the contribution is included in taxable income. Traditional pre-tax 401(k) deferrals generally reduce current federal taxable income and are generally taxable when withdrawn. Designated Roth 401(k) deferrals are included in income when contributed. Contributions and investment earnings are generally tax-free when distributed only if the distribution meets the qualified-distribution rules.
As the IRS puts it, “Unlike pre-tax salary deferrals, the amount employees contribute to a designated Roth account is includible in gross income.” IRS guidance on designated Roth accounts explains the distinction. Traditional deferrals generally remain subject to Social Security and Medicare taxes; they do not avoid those payroll taxes.
When Roth earnings qualify for tax-free treatment
A Roth distribution is generally qualified if it is made at least five years after the participant’s first Roth contribution and after the participant reaches age 59½, becomes disabled, or dies. If the participant dies, the distribution is made to a beneficiary. A withdrawal that does not meet the applicable requirements should not be assumed to be tax-free, particularly as to earnings.
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Decide by comparing tax rates, not labels
Compare the tax rate that applies to the dollars you contribute today with the rate likely to apply to those dollars when you withdraw them. A traditional contribution tends to be more attractive when the current marginal rate is higher than the expected rate on withdrawals. Roth tends to be more attractive when the expected future rate is higher. This is a framework, not a forecast: the IRS explains the tax mechanics, but it cannot establish your future income, tax bracket, or the best election for you.
- Current marginal tax rate: Consider federal and state income taxes. A traditional contribution’s current tax benefit depends on the income it reduces today.
- Retirement income and location: Estimate taxable income from retirement accounts and other sources, and consider whether you may live in a different state.
- Time until withdrawals: The period before withdrawals matters to your overall projection, but a long investment horizon alone does not make Roth the better choice.
- Cash flow: Roth contributions are made after current income tax, so the same nominal contribution generally leaves less take-home pay than a traditional contribution.
- Other retirement resources: A pension, taxable investments, or other substantial income can affect how much taxable income you may have in retirement.
Rules of thumb such as “young workers should always choose Roth” or “high earners should always choose traditional” leave out the tax rates that matter, the amount you can afford to contribute, and your plan’s terms. A Roth contribution is not free tax-free growth: you pay current income tax on the contribution. The comparison depends on what happens to the same dollars under each choice and on whether you sustain your saving.
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When splitting contributions can make sense
If future tax rates are uncertain, you may direct part of your employee deferrals to traditional and part to designated Roth, if your plan permits both. That gives you retirement savings with different tax treatment; it does not guarantee a better outcome. The two types share one employee elective-deferral limit rather than having separate limits. You cannot later recharacterize a Roth contribution as pre-tax by changing your election.
For 2026, the regular employee deferral limit is $24,500. The general age-50 catch-up limit is $8,000, while participants who attain ages 60 through 63 during 2026 may have a higher catch-up limit of $11,250 in applicable plans. These are IRS-announced 2026 limits; check current IRS guidance and your plan before setting an election, since annual limits and plan availability can change. See the IRS 2026 limit announcement and IRS contribution guidance.
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Choosing Roth for your own deferrals does not mean the employer match will be deposited into your designated Roth account. A plan can calculate a match based on Roth deferrals, but ordinary matching contributions are deposited in a separate plan account under IRS designated Roth account guidance. Match eligibility, amount, vesting, and available contribution types depend on the plan.
Before deciding, review your plan’s summary and election interface for whether it offers both pre-tax and designated Roth deferrals, how it calculates a match, whether catch-up contributions are available, and whether you can set a percentage for each contribution type. The plan’s rules determine which choices you can actually make.
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2026 Roth catch-up rule for some higher-wage participants
Beginning in 2026, if your prior-year wages from the employer sponsoring the plan exceeded $150,000, catch-up contributions must be designated Roth when the plan offers catch-ups and a Roth feature. This requirement applies to catch-up contributions, not to all your regular employee deferrals. The IRS’s Internal Revenue Bulletin 2026-06 provides related guidance; confirm how your plan implements the rule.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use this checklist before making your election
- Find your current federal and state marginal tax rates, and estimate the tax rate that may apply to withdrawals in retirement.
- Estimate other retirement income and consider likely changes in where you live.
- Check whether the additional current tax from Roth contributions would force you to reduce contributions or strain near-term expenses.
- Confirm that your plan offers both contribution types and review its match, vesting, and catch-up terms.
- Check your age, the applicable annual deferral limit, and whether the 2026 Roth catch-up requirement applies to you.
- If your outlook is uncertain, consider whether a split election is permitted and fits your cash flow.
This checklist is a starting point, not an individualized tax calculation. A pension, substantial taxable assets, a likely move between states, unusually high current income, or a complex tax situation can make professional tax or fiduciary financial-planning advice useful.
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One more rule: Roth 401(k) required minimum distributions
Under the IRS rule for designated Roth accounts, the participant is not required to take lifetime required minimum distributions from a designated Roth 401(k). That account rule should not be treated as a blanket exemption for beneficiaries or for other types of retirement accounts. See the IRS required minimum distribution guidance.
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