Traditional vs Roth 401(k): How to Choose for Your Bracket

If you have a 401(k), you face the same checkbox every year during open enrollment: pre-tax or Roth. Most people pick one once and never revisit it. That is a mistake, because the right answer for a second-year associate is often the wrong answer for a 48-year-old partner, and the wrong answer can cost real money over a career. The traditional vs Roth 401(k) decision is really a bet on your tax rate today against your tax rate in retirement, and that bet changes as your income, your state, and the tax code change.

This guide explains how each account works, how to decide by tax bracket and by career stage, and the rules around required minimum distributions, employer matching, and catch-up contributions that quietly tilt the answer. It is written for high-income professionals, physicians, and business owners, but the logic applies to anyone with a workplace plan. It is education, not individualized advice; our retirement planning team can run the numbers for your situation.

How Traditional and Roth 401(k) Contributions Differ

Both options live inside the same plan with the same investment menu. The difference is when you pay income tax, not whether you pay it.

What happens to your paycheck today

A traditional (pre-tax) contribution comes out of your pay before federal and state income tax is calculated. If you earn $300,000 and defer $24,500, you are taxed on $275,500. In the 35% federal bracket, plus Georgia state tax, that deferral trims roughly $10,000 from this year's tax bill. A Roth contribution comes out after tax. You defer the same $24,500, but your taxable income stays at $300,000, so your take-home pay is lower by the tax you did not avoid.

Either way, payroll taxes for Social Security and Medicare are calculated on your full wages. Neither choice reduces FICA.

What happens when you withdraw

Traditional balances, including all growth, are taxed as ordinary income when you take them out, and the IRS eventually requires you to take them out through required minimum distributions. Roth balances come out tax-free, growth included, as long as the withdrawal is qualified: you are at least 59½ and the account has been open five years. A non-qualified Roth withdrawal can trigger tax and a penalty on the earnings portion, so the five-year clock is worth tracking.

What both accounts share

The shared features are easy to forget when people argue about which is better:

• The same annual employee deferral limit, $24,500 for 2026 plus catch-ups at 50 or older. The IRS adjusts it each year; see the official 401(k) contribution limits page.
• The same employer match eligibility and investment menu.
• The same federal creditor protection under ERISA.
• The same 10% early withdrawal penalty on taxable amounts taken before 59½, unless an exception applies.

The Core Question: Your Tax Rate Now Versus Later

Strip away everything else and the math is simple. If your marginal tax rate at contribution is higher than your marginal rate at withdrawal, traditional wins. If it is lower, Roth wins. If they are equal, the two produce identical after-tax results, assuming you invest the same pre-tax dollars either way.

That last assumption matters. A $24,500 Roth contribution is worth more than a $24,500 traditional contribution because the Roth dollars are already taxed. To compare fairly, the traditional saver should invest the tax savings in a brokerage account. Most people do not, which is a practical argument for Roth: it forces more real savings into a tax-sheltered wrapper.

The hard part is that 'later' is uncertain. Your retirement tax rate depends on how much you accumulate, what other income you will have (a pension, Social Security, rental income, a business sale), where you live, and what Congress does with brackets. The 2017 rate structure was made permanent in 2025, so the scheduled 2026 increase did not happen, but rates can still change, and a large traditional balance will produce large taxable RMDs whether rates rise or fall.

• Factors that push your retirement tax rate higher: pre-tax balances above roughly $2 million by your early 70s, a pension, deferred compensation, the death of a spouse (single-filer brackets are narrower), and Medicare surcharges stacking on top of ordinary income.
• Factors that push it lower: retiring in a state with no income tax, spending well under your current income, and gap years between retirement and Social Security when you can convert at low rates.

Choosing a Traditional vs Roth 401(k) by Tax Bracket

Your marginal federal bracket is the fastest first cut. It is not the whole answer, but it puts you in the right neighborhood.

When traditional usually wins

If you are in the 35% or 37% federal bracket, the deferral is worth a lot today, and it is hard to be confident you will pay that rate in retirement. A dual-physician household earning $700,000 will almost certainly withdraw at a lower average rate than it defers at today, even with sizable RMDs. Traditional also makes sense if you expect to retire to a state with no income tax, or if you plan a lower-income phase (part-time work, a sabbatical, early retirement) during which you can convert traditional dollars to Roth at 22% or 24%. Our guide to Roth conversions explains that second step.

When Roth usually wins

If you are in the 12% or 22% bracket, paying tax now is cheap. Residents, fellows, early-career associates, and anyone in a temporarily low-income year (parental leave, a startup year, a mid-year job change) should lean Roth. The same logic applies to a high earner who already holds seven figures in pre-tax accounts and has decades of growth ahead. A Roth 401(k) adds a bucket that will never produce an RMD or a taxable withdrawal.

The 24% and 32% middle ground

This is where most mid-career professionals sit, and the decision is genuinely close. A reasonable rule: if your pre-tax balances are already large relative to your Roth balances, tilt Roth. If you are behind on savings and need the current tax break to afford the maximum contribution, tilt traditional and revisit every year. Many households simply split, which we cover below.

Do not forget state tax. Georgia taxes wages at a flat rate but excludes a meaningful amount of retirement income for residents 62 and older, which lowers the effective withdrawal rate for people who plan to stay.

Choosing by Career Stage

Bracket tells you about this year. Career stage tells you about the next thirty.

Training, early career, and first jobs

Default to Roth. A resident earning $70,000 is in the 22% bracket at most, and every dollar contributed now compounds tax-free for forty years. The same applies to an analyst, associate, or engineer in the first few years after school. The one exception: if a Roth contribution means you cannot afford to capture the full employer match, contribute enough to get the match first.

Peak earning years

Default to traditional, with two exceptions. First, if you already have a large pre-tax balance and little or no Roth, a few years of Roth deferrals build diversification without giving up the match. Second, if you are a business owner or physician with a cash balance plan, the 401(k) deferral is a small share of your total sheltering, and making it Roth costs relatively little.

Within ten years of retirement

Think about the shape of your retirement income. If you will have a pension, deferred compensation payouts, or a business sale landing in your first retirement years, your early-retirement bracket may be as high as today's, and Roth contributions now look better. If you expect several low-income years between your last paycheck and Social Security, traditional contributions now plus conversions during those years usually come out ahead.

Rules That Change the Math

Three rules changed in recent years, and each nudges the decision.

Required minimum distributions

Since 2024, Roth 401(k) accounts are no longer subject to RMDs during the owner's lifetime, matching the long-standing Roth IRA rule. Traditional balances must begin distributions at 73, or 75 for people born in 1960 or later. For a household with $3 million in pre-tax savings, the first RMD is well into six figures and rises for years. A Roth 401(k) balance sits outside that calculation entirely. Our RMD rules guide walks through the timing and the penalties.

The Roth five-year clock

Each Roth 401(k) has its own five-year clock, and when you roll a Roth 401(k) into a Roth IRA, the IRA's clock governs. If you have never opened a Roth IRA, the rollover starts a brand-new five-year period. The fix is simple: open a Roth IRA with even a small contribution or conversion years before you retire so the clock is already running.

Employer match and catch-up contributions

Employer matching contributions have always gone into the pre-tax side. Under SECURE 2.0, plans may now let you elect Roth treatment for the match, with the matched amount taxed as income in the year it is contributed. Not every plan offers this yet. Separately, beginning in 2026, employees whose prior-year Social Security wages exceeded $150,000 (a figure the IRS indexes) must make any catch-up contributions as Roth if the plan offers a Roth option. If the plan does not offer Roth, those employees cannot make catch-ups at all. The IRS summary of designated Roth accounts covers the mechanics.

Splitting Contributions and Building Tax Diversification

Retirement income comes from three kinds of accounts: taxable brokerage, tax-deferred (traditional 401(k) and IRA), and tax-free (Roth). Having money in all three lets you decide each year how much taxable income to recognize. That control is what lets retirees stay under Medicare IRMAA thresholds, keep more Social Security untaxed, and handle a large one-time expense without a large one-time tax bill.

If you are unsure, a split is a legitimate answer. A 60/40 traditional-to-Roth split for a 24% bracket household, or 80/20 for a 35% household with no Roth balances, gets you diversification without abandoning the current-year deduction. Revisit the ratio each open enrollment. High earners who cannot contribute directly to a Roth IRA can still build the tax-free bucket through a Roth 401(k) and a backdoor Roth IRA. The IRS Roth comparison chart lays the accounts side by side.

The traditional vs Roth 401(k) choice is not permanent, and it is not a coin flip. Use your bracket for the first cut, your career stage for the second, and the newer rules on RMDs, Roth catch-ups, and Roth matching to refine it. Then revisit the election every year, especially after a promotion, a partnership buy-in, or a change in where you plan to retire. If you want help modeling the after-tax outcome, get in touch with Attend Wealth.

Tony Colunga · Founder, Attend Wealth

Tony leads Attend Wealth, a fee-based wealth management firm in Atlanta serving professionals, families, physicians, and business owners. Advisory services are held to a fiduciary standard. More about Attend