Can I contribute to both a Roth 401(k) and a traditional 401(k) in the same year?

Yes. Most plans allow you to split contributions between both. The combined total across both still can't exceed the annual employee contribution limit ($24,500 for 2026, before catch-up).

Does choosing Roth 401(k) affect how much my employer can match?

No. Your employer's match is typically based on your total contribution percentage regardless of whether it's Roth or traditional. However, the match itself is deposited into a traditional, pre-tax account and will be taxed when withdrawn.

Is there an income limit to contribute to a Roth 401(k)?

No. Unlike a Roth IRA, Roth 401(k)s have no income restrictions, so high earners who are phased out of Roth IRA contributions can still use a Roth 401(k) if their employer offers one.

What happens if I'm 50+ and earn over $150,000 — do I have to use Roth?

Starting in 2026, if your prior year's wages exceeded roughly $150,000, your catch-up contributions must be made as Roth contributions rather than traditional, under a SECURE 2.0 provision.

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

Roth or traditional 401(k)? Here's how the tax math actually works, with 2026 contribution limits, so you can pick the right one.

If your employer's 401(k) plan lets you choose between "Roth" and "traditional" contributions, you've probably just picked whichever one sounded more familiar and moved on. That's a mistake worth fixing, because the choice affects how much tax you pay — and when you pay it — for decades.

Here's the short version: it's not about which account is "better." It's about whether you'd rather pay tax on this money now or later, and that depends mostly on your current tax bracket versus your expected tax bracket in retirement.

The Core Difference

A traditional 401(k) takes your contribution out of your paycheck before taxes. That lowers your taxable income today, but you'll owe ordinary income tax on every dollar — contributions and growth — when you withdraw it in retirement.

A Roth 401(k) takes your contribution out after taxes. You get no upfront tax break, but qualified withdrawals in retirement, including all the growth, are completely tax-free.

Using a $100,000 salary and a 10% contribution as an example: with a traditional 401(k), your taxable income for the year drops to $90,000. With a Roth 401(k), your taxable income stays at $100,000, but that $10,000 grows and comes out tax-free later.

2026 Contribution Limits

These limits apply the same way to both account types — the IRS treats Roth and traditional employee contributions as sharing one combined limit, not two separate ones.

Category	2026 Limit
Employee contribution limit (under 50)	$24,500
Catch-up (age 50+)	$8,000, bringing the total to $32,500
Super catch-up (age 60–63)	$11,250 instead of the $8,000 standard catch-up
Combined employee + employer limit	$72,000 for the combined employee and employer contributions

One important wrinkle starting this year: if you're 50 or older and earned more than roughly $150,000 in wages the prior year, your catch-up contributions have to go into the Roth side of the plan, whether you want them there or not. Starting in 2026, a provision in SECURE 2.0 requires that if your previous year's income exceeded the IRS limit, any retirement contributions you make above the elective catch-up maximum have to be made as Roth, and this rule does not apply if your 2025 wages were $150,000 or less. If your plan doesn't offer a Roth option at all, this can actually block you from making catch-up contributions until your employer adds one.

No Income Limit on Roth 401(k)s

This is where the Roth 401(k) beats the Roth IRA outright. Roth IRAs phase out at higher incomes, but the Roth 401(k) has no such cap. There are no income limitations with the Roth 401(k), making it an attractive option for high earners whose salaries might disqualify them from contributing to a Roth IRA. If you make too much to contribute directly to a Roth IRA, the Roth 401(k) is still fully open to you.

How to Actually Decide

Ask yourself these three questions:

What's your tax bracket right now? If you're in a lower bracket today than you expect to be later — early career, a temporary pay cut, a year with unusually low income — Roth contributions let you lock in that low rate permanently.
Do you expect a higher or lower tax rate in retirement? Nobody knows future tax rates for certain, but if you're a high earner today and expect your retirement income (Social Security, pensions, RMDs from other accounts) to be modest, traditional contributions likely save you more.
Do you want tax-free income you can control later? Roth withdrawals don't count as taxable income, which can help you manage things like Medicare premium brackets or avoid pushing yourself into a higher bracket in retirement.

A Few Rules That Trip People Up

Employer matching money always lands in a traditional (pre-tax) bucket, even if you contribute 100% to the Roth side. That match will be taxed when you withdraw it, regardless of your own contribution choice.
Roth 401(k) withdrawals are only tax-free if you're at least 59½ and the account has been open at least five years. Pull money out early and you can owe tax and a penalty on the earnings.
You don't have to pick one or the other. Most plans let you split contributions between Roth and traditional, which can hedge against not knowing what future tax rates will look like.

You Don't Have to Guess Alone

If you're not sure which bucket makes sense for your situation, that's a normal thing to be unsure about — it depends on your income trajectory, your other savings, and assumptions about future tax policy that nobody can predict perfectly. Running a quick check of your overall financial health with a tool like Grade My Finance can help you see how your retirement savings rate and account mix stack up before you commit to one strategy over another.

Bottom Line

Traditional 401(k) contributions save you tax money now. Roth 401(k) contributions save you tax money later. Neither is automatically the smarter move — it depends on your bracket today versus your expected bracket in retirement, and for many people, splitting contributions between both is the simplest way to hedge that bet.