Roth 401(k) vs. Traditional 401(k): Which Is Better for Your Paycheck? (2026)

Published August 6, 2026 · 9 min read

When your employer offers both a Roth 401(k) and a Traditional 401(k), the choice can feel confusing. Both let you save for retirement through payroll deductions. Both have the same contribution limits. But they are taxed very differently — and that difference has a real impact on how much money lands in your bank account every paycheck.

This guide breaks down how each option works, shows you exactly how each affects your take-home pay, and helps you figure out which one makes more sense for your situation.

What Is a Traditional 401(k)?

A Traditional 401(k) is a pre-tax retirement account. Money comes out of your paycheck before income taxes are calculated. This lowers your taxable income today, which means you pay less in federal and state income tax right now.

The trade-off: you pay taxes when you withdraw the money in retirement. Every dollar you pull out — contributions and investment growth alike — is taxed as ordinary income at whatever your tax rate is in retirement.

Traditional 401(k) contributions also reduce FICA taxes? No. Social Security (6.2%) and Medicare (1.45%) are still calculated on your full gross pay, even when you contribute to a Traditional 401(k). Only income taxes are reduced. (IRS — 401(k) Plan Overview)

What Is a Roth 401(k)?

A Roth 401(k) is an after-tax retirement account. Money comes out of your paycheck after income taxes are calculated. You get no tax break today.

The trade-off: qualified withdrawals in retirement are completely tax-free — including all the investment growth. If you put $50,000 into a Roth 401(k) over your career and it grows to $300,000, you owe zero taxes on that $250,000 gain when you retire. (IRS — Designated Roth Accounts)

For a withdrawal to be “qualified” (tax-free), two conditions must be met: you must be at least 59½ years old, and the account must have been open for at least 5 years.

2026 Contribution Limits: Same for Both

The IRS sets the same annual contribution limit for both account types. For 2026:

These limits are shared between both accounts. If you contribute $10,000 to a Traditional 401(k) and $10,000 to a Roth 401(k) in the same year, you have used $20,000 of your $23,500 limit. (IRS — Retirement Plan Contribution Limits)

How Each Option Affects Your Paycheck

This is where the rubber meets the road. Let’s use a concrete example: a single filer earning $70,000 per year, paid biweekly (26 paychecks), contributing $6,000 per year (about $230.77 per paycheck).

*Excludes state income tax. Take-home pay will vary by state. Try the free paycheck calculator for your state.

The bottom line: the Traditional 401(k) puts $1,320 more per year in your pocket today (about $50 more per paycheck). That’s the immediate tax savings. But the Roth 401(k) will give you tax-free income in retirement.

The Core Question: Are You in a Higher Tax Bracket Now or Later?

The choice between Roth and Traditional comes down to one question: Will you pay more in taxes now, or in retirement?

• If you expect to be in a lower tax bracket in retirement (your income will drop), Traditional wins. You save on taxes now at your higher current rate and pay taxes later at a lower rate.
• If you expect to be in a higher tax bracket in retirement (your income, Social Security, and investment distributions will be substantial), Roth wins. You pay taxes now at a lower rate and get tax-free income later when you’d owe more.
• If you expect to be in the same bracket, the math is essentially a wash — though Roth often wins slightly because growth is tax-free.

The problem? No one knows exactly what tax rates will look like in 20 or 30 years, or how much income they’ll have in retirement. That uncertainty is one reason many financial advisors suggest splitting contributions between both account types.

When Traditional 401(k) Makes More Sense

Choose the Traditional 401(k) when:

• You are in a high tax bracket now. If you are in the 32% or 35% bracket today, the immediate tax savings are significant. Deferring those taxes makes financial sense if you expect to retire at a lower rate.
• You need more take-home pay now. If you are tight on cash — paying off debt, saving for a house, covering childcare — the Traditional’s lower paycheck impact gives you more flexibility today.
• You are close to retirement. The fewer years until you retire, the less time for Roth investments to grow tax-free. Traditional contributions deliver certain tax savings now.
• You expect a pension or modest Social Security. Retirees with predictable, lower income often stay in a low bracket — making deferred taxes a smart strategy.

When Roth 401(k) Makes More Sense

Choose the Roth 401(k) when:

• You are early in your career. If you are in the 10% or 12% bracket now, pay taxes on those contributions while the rate is low. Your income — and tax rate — will likely rise over time.
• You have a long investment horizon. The longer your money has to grow tax-free, the more powerful the Roth advantage becomes. Thirty years of compounding gains that are never taxed adds up to a lot.
• You expect tax rates to rise. If you believe federal tax rates will be higher in the future (a reasonable concern given national debt levels), locking in today’s rates with a Roth is a good hedge.
• You want tax diversification. Having some pre-tax and some post-tax retirement savings gives you flexibility to manage your tax bill in retirement — pulling from whichever account is more favorable in a given year.
• You earn too much for a Roth IRA. Roth IRAs have income limits ($161,000 for single filers in 2026). Roth 401(k)s have no income limit, making them the only Roth option available to high earners. (IRS — Roth IRA Contribution Limits)

Can You Do Both?

Yes — and many financial advisors recommend it. You can split your contributions between Traditional and Roth as long as the combined total stays within the annual limit ($23,500 in 2026 for those under 50).

For example, you might contribute $12,000 to Traditional (for the immediate tax break) and $11,500 to Roth (for tax-free growth). This gives you both tax savings today and tax-free income in retirement — what’s called tax diversification.

Most employer plans that offer a Roth option let you designate any percentage of your contribution as Roth. Check your plan documents or contact your HR department to see what is available.

What About Required Minimum Distributions?

One important difference: Traditional 401(k)s have required minimum distributions (RMDs) starting at age 73. The IRS requires you to withdraw a set amount each year, which forces taxable income in retirement whether you need the money or not.

Roth 401(k)s also technically have RMDs — but you can avoid them entirely by rolling your Roth 401(k) into a Roth IRA at retirement. Roth IRAs have no RMDs, giving you more control over when and how much you withdraw. (IRS — Required Minimum Distributions FAQ)

How Your State Factors In

State income taxes play an important role in this calculation. A Traditional 401(k) reduces your federal taxable income — and in most states, it also reduces your state taxable income. This amplifies the immediate tax savings in high-tax states like California (up to 13.3%) or New York (up to 10.9%).

If you live in a no-income-tax state like Texas, Florida, or Nevada, the state tax advantage of Traditional is zero — making the Roth slightly more attractive if the other factors are roughly equal.

Also consider: if you plan to retire in a different state with lower taxes, your Traditional withdrawals may be taxed less than your contributions were saved. That further tilts the scale toward Traditional.

A Simple Framework for Deciding

The Bottom Line

There is no universally “better” 401(k) type — the right choice depends on your current tax bracket, your expected income in retirement, your time horizon, and your state’s tax treatment.

What matters most is that you contribute. Whether you choose Traditional or Roth, the biggest driver of your retirement security is how much you save, not which account type you pick. Maxing out either option in 2026 ($23,500 if you are under 50) puts you well ahead of most Americans.

If you are still unsure, splitting contributions between both is a perfectly reasonable strategy. You get a partial tax break today and tax-free income tomorrow — the best of both worlds.

Sources

• IRS — 401(k) Plan Overview
• IRS — Designated Roth Accounts in 401(k) Plans
• IRS — Retirement Plan Contribution Limit Increases
• IRS — Roth IRA Contribution Limits and Phase-Out Ranges
• IRS — Required Minimum Distributions FAQ
• Tax Foundation — 2026 Federal Tax Brackets