Roth vs Traditional 401(k): A Side-by-Side Tax Bracket Comparison

Updated July 12, 2026

You're leaving money on the table. And you probably don't even know which pile it's sitting on.

The Roth versus Traditional 401(k) debate isn't about opinions. It's about math. And in 2026, the math has changed. New contribution limits. New catch-up rules from the SECURE 2.0 Act — a retirement law passed in 2022 that rewrote the rules on how much you can save and where that money has to go. Medicare surcharges that didn't exist a decade ago.

By the end of this video, you'll know exactly which one saves you more — based on your income, your tax bracket, and what retirement actually looks like for you.

Key Takeaways

Here's the quick version.

Roth wins when you expect your tax rate in retirement to be higher than it is right now. Traditional wins when you expect it to be lower. High earners face Medicare surcharges and Required Minimum Distributions — or RMDs — that tilt the math toward Roth. And SECURE 2.0 changed the catch-up rules in ways most people haven't caught up with yet.

Here's how the numbers shake out at three income levels.

How the Two Plans Actually Work

With a Traditional 401(k), your contributions come out of your paycheck before taxes. You get a tax break now, but you pay income tax on every dollar you withdraw in retirement.

With a Roth 401(k), you contribute after-tax dollars. No tax break today. But your withdrawals in retirement — contributions and growth — come out completely tax-free.

So which is better? That depends on one question. Will your tax rate be higher or lower when you start pulling money out?

If your rate will be higher later, Roth wins. You're paying taxes at today's lower rate and dodging tomorrow's higher one.

If your rate will be lower later, Traditional wins. You skip taxes now while you're in a high bracket and pay them later when you're in a lower one.

Simple concept. The hard part is running the actual numbers.

2026 Contribution Limits — Get These Right

The base contribution limit for 2026 is $24,500 for both Roth and Traditional.

Here's where it gets specific. If you're 50 or older, you can add an extra $8,000 in catch-up contributions. That brings your total to $32,500.

But SECURE 2.0 created a new tier. If you're between 60 and 63, you get a super catch-up of $11,250 instead of the standard $8,000. Your total ceiling is $34,750.

One more wrinkle. If you earned more than $145,000 in the prior year — that's based on your previous year's W-2 wages — SECURE 2.0 requires your catch-up contributions to go into Roth, not Traditional. This comes from Section 603 of SECURE 2.0, and it takes effect for tax year 2026. You don't get a choice. The IRS made it for you.

So what does the math look like at different income levels?

The $85,000 Earner

You're in the 22% federal bracket. You max out your 401(k) at $24,500.

With Traditional, that $24,500 reduces your taxable income. Your tax savings right now: about $5,170 per year.

With Roth, you pay that $5,170 in taxes today. No deduction. But every dollar grows and comes out tax-free.

Here's the real question. What will your tax rate be in retirement?

If you retire on less income — say $50,000 a year from Social Security and moderate savings — you'd fall into the 12% bracket. Traditional withdrawals would be taxed at 12%. You paid 22% to earn the deduction. That's a 10-point spread in your favor.

Traditional wins in this scenario.

But if tax rates rise — and with national debt above $36 trillion per Treasury data, that's not a wild assumption — the math flips. If your retirement bracket ends up at 22% or higher, you'd have been better off in Roth all along.

So what should the $85K earner do? If you genuinely expect lower income in retirement and believe tax rates won't jump significantly, Traditional is the stronger play. If you're uncertain, splitting contributions between both is a reasonable hedge.

One more piece of context when weighing marginal rates: the whole-economy tax bite sits far below any bracket. Personal current taxes ran 12.39% of U.S. personal income in 2025 — Canopy Press’s effective personal tax burden series tracks that gap between statutory rates and the aggregate average back to 2010.

The $150,000 Earner

Now the math shifts. You're in the 24% bracket. And a new cost enters the picture: Medicare Income-Related Monthly Adjustment Amount, known as IRMAA.

IRMAA is a surcharge on your Medicare Part B and Part D premiums. It kicks in when your modified adjusted gross income exceeds certain thresholds. For 2026, if your income crosses roughly $103,000 as a single filer, you start paying more — potentially $1,145 to $6,936 extra per year depending on how far above the threshold you land.

Here's why that matters for the Roth decision. Traditional 401(k) withdrawals count as taxable income. Required Minimum Distributions — the mandatory withdrawals that start at age 73 — push your income up whether you need the money or not. That higher income can trigger IRMAA surcharges you'd never face with Roth withdrawals.

Roth withdrawals don't count toward IRMAA thresholds. They don't count toward your modified adjusted gross income at all.

For someone at $150K, the upfront tax cost of Roth is real — you're paying 24% on contributions today instead of deducting them. But between avoiding IRMAA surcharges and eliminating RMD-driven taxes in retirement, Roth often comes out ahead over a 20-to-30-year retirement.

And remember — if you're over 50, your catch-up contributions must go to Roth anyway if you earned over $145K last year.

The $250,000 Earner

At this income level, Roth is almost always the right call. Here's why.

You're in the 35% bracket. Traditional gives you a big deduction today. But what happens when you retire with a large Traditional balance?

Required Minimum Distributions force you to withdraw a percentage of your balance every year starting at 73. On a $2 million balance, that's roughly $75,000 per year — and it grows as you age. That $75,000 is fully taxable income.

Now add Social Security. Up to 85% of your Social Security benefits become taxable when your combined income — adjusted gross income plus nontaxable interest plus half your Social Security — exceeds $34,000 for single filers. Traditional 401(k) RMDs count toward that combined income figure.

So your RMDs aren't just taxed themselves. They can push your Social Security benefits into the taxable zone too, creating a compounding tax hit.

With Roth, withdrawals don't count toward combined income. Your Social Security stays less taxed. Your Medicare premiums stay lower. And you never face RMDs — SECURE 2.0 eliminated Required Minimum Distributions for Roth 401(k) accounts starting in 2024.

For a high earner, yes, you're giving up a 35% deduction today. That stings. But the lifetime tax savings from avoiding RMDs, IRMAA surcharges, and Social Security taxation typically more than compensate.

What About Your Heirs?

You might have heard that Roth accounts avoid estate taxes. That's not accurate.

Roth 401(k) balances are included in your taxable estate just like Traditional balances. If your estate exceeds the federal exemption — $13.99 million per person in 2026 — both Roth and Traditional assets get hit with estate tax.

What Roth does avoid is income tax on withdrawals for your heirs. When your beneficiaries inherit a Traditional 401(k), they pay income tax on every dollar they withdraw. With a Roth, they withdraw tax-free. Under the 10-year rule from the SECURE Act, most non-spouse beneficiaries must empty the account within 10 years either way. But with Roth, those withdrawals don't add to their taxable income.

That's a meaningful difference. Just don't confuse it with estate taxes. They're separate issues.

When Traditional Still Makes Sense

Traditional isn't dead. It's the better choice in specific situations.

If you're earning under $60,000 and sitting in the 12% bracket, the Roth advantage shrinks. You're already paying a low rate. The Traditional deduction might help you more right now, especially if cash flow is tight.

If you're in a high-tax state today but plan to retire in a no-income-tax state like Florida or Texas, Traditional lets you deduct at your current state rate and withdraw later at zero state tax. That's a real arbitrage.

And if you're confident your retirement income will be substantially lower than your working income, Traditional's upfront savings compound for decades before you pay tax at a lower rate.

When to Choose Roth

Choose Roth if you're a high earner — $150,000 or above — facing potential IRMAA surcharges and RMD complications.

Choose Roth if you want to avoid Required Minimum Distributions entirely. Traditional forces withdrawals. Roth doesn't.

Choose Roth if you want to leave tax-free income to your heirs instead of handing them a tax bill on every withdrawal.

And choose Roth if you believe tax rates are heading higher. With the 2017 Tax Cuts and Jobs Act provisions set to sunset after 2025, several brackets could revert to higher levels. If that happens, today's rates look like a bargain.

The Split Strategy

Most financial planners recommend something people overlook. You don't have to pick just one.

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You can split your contributions between Roth and Traditional in the same year, as long as your combined total doesn't exceed the annual limit. This gives you tax diversification — some money taxed now, some taxed later. In retirement, you pull from whichever bucket minimizes your tax bill that year.

It's not as clean as picking a side. But it hedges against the one thing nobody can predict: future tax rates.

What to Do This Week

Pull up your 401(k) portal. Check whether your contributions are going to Roth, Traditional, or both. If you're over 50 and earned more than $145,000 last year, verify that your catch-up contributions are set to Roth — your plan administrator should handle this, but mistakes happen.

Run the numbers for your bracket. If you're above $150K, the case for Roth is strong. If you're below $60K, Traditional probably serves you better right now. If you're in between, the split strategy is worth a serious look.

This is informational content, not financial advice. Talk to a tax professional about your specific situation.

For the full breakdown with comparison tables, head to canopy.press. We publish data-driven guides on money, work, and building a richer life every week.

Updated March 28, 2026: Corrected factual errors.

Found an error? At Canopy Press, accuracy comes first. If you spot a claim that needs checking, let us know at [email protected] — we'll verify and correct it immediately.

Sources

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