Roth vs. Traditional 401(k): Which Should You Choose?

Updated June 16, 2026 · 6 min read

Both a traditional and a Roth 401(k) let you save for retirement through payroll, with the same $24,500 contribution limit in 2026. The difference is *when* you pay tax. A traditional 401(k) is pre-tax — it lowers your taxable income now, and you pay tax when you withdraw in retirement. A Roth 401(k) is after-tax — no break today, but qualified withdrawals are completely tax-free later. The best choice comes down to one question: will your tax rate be higher now or in retirement?

The trade-off in one table

Roth vs. traditional 401(k)
	Traditional 401(k)	Roth 401(k)
Tax break	Now (pre-tax)	Later (tax-free withdrawals)
Effect on this year's paycheck	Smaller tax hit — take-home drops less	Full cost — taxed before contributing
Taxed in retirement?	Yes, on withdrawals	No, qualified withdrawals are tax-free
2026 contribution limit	$24,500 (shared)	$24,500 (shared)
Best when	Your rate is higher now	Your rate is higher (or unknown) later
Required withdrawals (RMDs)	From traditional balances	No RMDs on Roth 401(k) starting 2024

The $24,500 limit (2026) is shared across both — you can split contributions between Roth and traditional, but the combined total can't exceed the cap.

Choose traditional if…

You're in a high tax bracket now and expect a lower one in retirement.
You want to lower your taxable income (and AGI) this year.
You'd reinvest the upfront tax savings elsewhere.

Choose Roth if…

You're early in your career or in a relatively low bracket now.
You expect to be in a higher bracket — or expect tax rates to rise — by retirement.
You value tax-free, predictable income later and no required distributions.

Not sure? Many people split the difference — some in each — to hedge against not knowing future tax rates.

One rule that applies to both: get the match

Your employer match is the same either way (it always goes into a pre-tax/traditional bucket). Contribute at least enough to capture the full match before optimizing Roth vs. traditional — it's an immediate, guaranteed return no tax strategy can beat.

See how a pre-tax contribution changes your check: enter a 401(k) amount in the paycheck calculator to compare take-home pay at different rates.

Try the calculators

How Much to Contribute to a 401(k)Paycheck Calculator HSA vs. FSA

Frequently asked questions

What is the difference between a Roth and traditional 401(k)?

A traditional 401(k) is funded with pre-tax money, lowering your taxable income now; withdrawals in retirement are taxed. A Roth 401(k) is funded with after-tax money, so there's no break now, but qualified withdrawals are tax-free.

Should I choose Roth or traditional 401(k)?

Pick traditional if your tax rate is higher now than it will be in retirement, and Roth if you expect a higher rate later (or you're early-career in a low bracket). When unsure, splitting contributions between both is a reasonable hedge.

Can I contribute to both Roth and traditional 401(k)?

Yes. You can split contributions between them, but the combined total can't exceed the annual limit — $24,500 for 2026 ($32,500 if you're 50+).

Does a Roth 401(k) lower my paycheck more than traditional?

Yes. Roth contributions are after-tax, so the full amount comes out of take-home pay. A traditional contribution of the same size reduces take-home by less because it also cuts your income tax for the year.

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