Roth vs Traditional: Which Retirement Account Is Best for You?

Key Differences

Tax Deduction Timing: The Core Decision

Traditional contributions: Deductible in the year made. If you contribute $7,500 (2026 limit) to a traditional IRA, you reduce your 2026 taxable income by $7,500. At 22% bracket, you save $1,650 in taxes.

Roth contributions: No deduction. You contribute $7,500 after-tax dollars (money you've already paid income tax on). The contribution doesn't reduce your 2026 taxable income.

The trade-off:

• Traditional: Pay tax now (save $1,650 in 2026) by taking a deduction, then pay tax on withdrawal in retirement.
• Roth: Pay tax now (no savings in 2026), then no tax in retirement.

Which is better depends on whether your tax rate is higher or lower in retirement.

Predicting Your Retirement Tax Rate

Traditional makes sense if you expect a lower tax rate in retirement:

• You're a high earner now (32%–37% bracket) but expect to withdraw less income in retirement (22%–24% bracket).
• You're deferring income for multiple years before retirement, expecting a gap year or two with low income.

Roth makes sense if you expect a higher or equal tax rate in retirement:

• You're young and expect higher earnings and taxes later.
• You judge that rates will be higher when you withdraw. Note this is a forecast about a future Congress, not a scheduled event — the 2026 reversion was cancelled, as the next section explains.
• You'll have significant investment gains and want tax-free withdrawals to avoid capital gains tax.
• You expect Social Security to be heavily taxed in retirement (combined income-based taxation).

The Tax Cliff That Didn't Happen

For years the standard argument for Roth was a deadline: the 2017 tax cuts were legislated to expire on 31 December 2025, and the top rate was scheduled to revert from 37% to 39.6% on 1 January 2026. Plenty of advice still repeats it.

It didn't happen. The One Big Beautiful Bill Act, enacted in July 2025, made the TCJA individual rate structure permanent. The 2026 brackets are 10%, 12%, 22%, 24%, 32%, 35% and 37% — the same seven rates, inflation-adjusted (Rev. Proc. 2025-32). If you read something recommending Roth because rates are about to rise, that reasoning expired with the statute it was built on.

What that changes for the decision. The Roth case no longer rests on a scheduled rate increase, which means it has to rest on your own circumstances instead:

• Your bracket now versus in retirement. This was always the real question, and now it's the only one. Traditional wins if you'll draw at a lower rate than you contribute at; Roth wins if you'll draw at a higher one.
• "Permanent" means until Congress changes it. Permanent is a drafting term, not a guarantee — a future Congress can raise rates any year it likes. That's a genuine reason to hold some Roth, but it's a diversification argument, not a deadline.
• Roth still avoids RMDs. Roth IRAs never had them, and since 2024 Roth 401(k)s don't either (SECURE 2.0 §325). For anyone who doesn't need the money at 73, that's often worth more than the rate arbitrage ever was.

Sources: Rev. Proc. 2025-32 (2026 brackets) · Tax Foundation, 2026 brackets.

Age and Time Horizon

Younger than 55? Roth is usually better. You have 30–40+ years of tax-free growth. Even if retirement tax rates are identical to today's, decades of compound tax-free growth outweigh losing a deduction today.

Older than 55? Traditional might be better if you're in a high bracket now. You have fewer years until retirement and RMD requirements (age 73+), which force withdrawals and income.

Rule of thumb: If you're more than 15 years from retirement, lean Roth. If you're within 10 years, balance based on expected retirement income and tax rates.

Income Limits and High Earners

Roth IRA contributions are subject to income phase-outs:

If you earn above these limits, you can't contribute directly to a Roth IRA. High earners use the backdoor Roth (contribute non-deductible to traditional IRA, then immediately convert to Roth). This bypasses income limits on Roth contributions.

Traditional IRA contributions are also limited by income if you have access to an employer-sponsored plan:

Above these limits, traditional IRA contributions aren't deductible (though you can still contribute non-deductible amounts).

High earners often have no choice: they're above Roth phase-out limits and traditional deduction limits. Their options are backdoor Roth, 401(k) traditional/Roth deferrals, or Roth 401(k).

Required Minimum Distributions (RMDs)

Traditional IRAs require withdrawals starting at age 73 (2026 rules). The RMD is your balance divided by life expectancy factors (IRS tables). The RMD is taxable income.

Roth IRAs have no RMD for the owner. You can let the account grow indefinitely without forced withdrawals. At death, your beneficiaries must take RMDs (unless they're spouses), but you don't pay taxes on the inherited Roth.

This is an advantage of Roths for long-lived retirees and legacy planning.

RMD example: Age 73, traditional IRA balance $500,000. The Uniform Lifetime Table factor at 73 is 26.5 (25.5 is the age-74 factor — using the wrong row understates the divisor and overstates the distribution).

• Forced RMD: $500,000 / 26.5 = $18,868 (taxable as ordinary income)
• At 24% bracket: $4,528 in taxes

A Roth IRA with the same $500,000 balance has no RMD—you can leave it invested indefinitely.

Medicare and Social Security Taxation

Traditional IRA withdrawals increase your Modified Adjusted Gross Income (MAGI), which affects:

1. Medicare premiums: Higher MAGI increases Part B and Part D premiums (IRMAA—Income-Related Monthly Adjustment Amount). Above $109,000 (single, 2026), an income-related surcharge is added to your Part B and Part D premiums.

2. Social Security taxation: Up to 85% of Social Security benefits are taxed if your combined income (AGI + 50% of SS benefits) exceeds $25,000 (single) or $32,000 (married).

Roth withdrawals don't count toward MAGI or combined income. Withdrawing from a Roth IRA doesn't increase Medicare premiums or trigger Social Security taxation.

Example: Single retiree, age 72, with a $50,000 pension, $30,000 of Social Security, $200,000 in a traditional IRA and $200,000 in a Roth. They need $30,000 more this year and can take it from either account.

Taking it from the traditional IRA:

• Provisional income = $50,000 + $30,000 + $15,000 (half the Social Security) = $95,000, far past the $34,000 threshold, so 85% of the benefit — $25,500 — is taxable
• AGI = $50,000 + $30,000 + $25,500 = $105,500
• Deductions: $16,100 standard + $2,050 age-65 addition + $4,170 of the $6,000 senior deduction (it phases out at 6% of income above $75,000) = $22,320
• Taxable income $83,180 → federal tax $13,012
• Medicare: MAGI of $105,500 sits $3,500 under the $109,000 IRMAA threshold. No surcharge — but only just

Taking it from the Roth instead:

• AGI = $50,000 + $25,500 = $75,500
• Deductions: $16,100 + $2,050 + $5,970 of the senior deduction = $24,120
• Taxable income $51,380 → federal tax $6,016
• Medicare: nowhere near the threshold

Difference: about $7,000 of federal tax in a single year, for identical spending.

Now notice what the Roth did not do, because this is where most write-ups overclaim. 85% of the Social Security is taxable either way — the pension alone pushes provisional income past the top threshold, and no Roth withdrawal can pull it back. And neither path triggers IRMAA this year. What the Roth actually bought was bracket room: $30,000 that would have been taxed at 22% simply never entered the return. That is the whole mechanism. "Roth withdrawals are tax-free, so the tax bill is zero" is wrong — the pension is still taxable and so is most of the Social Security. The Roth changes what stacks on top of them.

Conversion Strategies: Filling Lower Tax Brackets

A hybrid approach: contribute to a traditional account, then convert to Roth in low-income years.

Example: Single early retiree, age 55, working part-time for $20,000 a year until Social Security starts at 62.

• Taxable income before any conversion: $20,000 − $16,100 standard deduction = $3,900
• Top of the 12% bracket for a single filer in 2026: $50,400
• Room to convert without leaving the 12% bracket: $50,400 − $3,900 = $46,500 a year

Strategy: convert exactly $46,500 each year from 55 through 61 — seven years, $325,500 in total.

• Tax on $50,400 of taxable income: $1,240 (10% on the first $12,400) + $4,560 (12% on the next $38,000) = $5,800
• Tax on the $3,900 of part-time income alone would have been $390
• So the conversion itself costs $5,410 a year — an effective 11.6% on the amount converted
• Across seven years: $37,870 of tax to move $325,500 into a Roth

Convert the same $325,500 later instead, in years when Social Security and a pension put you at a 22% marginal rate, and it costs $71,610. Difference: about $33,700.

Two corrections worth carrying away from that arithmetic. First, "my bracket is 10%, so a conversion costs 10%" is not how it works — a conversion big enough to be worth doing climbs through the brackets, so the number that matters is the effective rate across the whole conversion, 11.6% here rather than 10%. Second, convert one dollar past $50,400 and that dollar is taxed at 22% — the exact rate the ladder exists to avoid. The ceiling is the strategy.

Work out your own conversion room, year by year, with the Roth conversion planner — the input that decides everything is the distance from your projected taxable income up to the bracket ceiling, not the part of the bracket you have already used.

Employer 401(k) Choices: Traditional vs. Roth

Many employers offer both traditional and Roth 401(k) options. The same trade-off applies:

• Traditional 401(k): Deferrals reduce taxable income immediately. At age 59.5+, withdrawals are taxed.
• Roth 401(k): Deferrals are after-tax. Withdrawals are tax-free.

High earners often split contributions: traditional 401(k) to get a tax deduction now (reducing their high bracket), and Roth for tax-free growth on some funds.

Example: Attorney earning $250,000, in 35% bracket.

• Contribute $15,000 to traditional 401(k): Saves $5,250 in taxes ($15,000 × 35%).
• Contribute $9,500 to Roth 401(k): No deduction, but growth is tax-free.
• Total deferred: $24,500 (2026 annual employee deferral limit).

The split balances a large tax deduction now (traditional) with some tax-free growth (Roth) in retirement.

Spousal IRAs and Income Considerations

If you're married and one spouse has no earned income, the working spouse can fund a spousal IRA (traditional or Roth) for the non-working spouse.

Example: High-earning spouse earns $200,000, non-working spouse has $0 income.

• High earner can contribute $7,500 to their own traditional or Roth IRA (depending on income limits).
• High earner can also contribute $7,500 to a spousal IRA for the non-working spouse.
• Total: $15,000 contributed.

If the working spouse contributes to a traditional IRA, it's a deduction for the working spouse (subject to phase-out limits). A spousal Roth IRA for the non-working spouse is often ideal because the non-working spouse has zero income and is in the 0% bracket—converting later is free.

Decision Framework

FAQ

Can I contribute to both a Roth IRA and a traditional IRA in the same year?

Yes, but the $7,500 limit for 2026 is a combined limit across every IRA you own — $4,000 to a Roth and $3,500 to a traditional is fine; $7,500 to each is not. Opening a second account does not create a second limit. At 50 or older the combined ceiling rises to $8,600 with the $1,100 catch-up. Splitting is a reasonable choice when you genuinely cannot predict your retirement bracket: you end up with one bucket the IRS can tax and one it cannot, and you choose which to draw from each year in retirement.

Can my employer's match go into the Roth side?

It can now, if the plan allows it. SECURE 2.0 §604 lets employers make matching and non-elective contributions as designated Roth contributions where the plan offers the option and the employee elects it. The catch is that a Roth match is taxable income to you in the year it is made and must be fully vested immediately. Many plans still have not added the feature, so the default remains a pre-tax match sitting alongside your Roth deferrals — which is why a lot of people who think they have a "pure Roth 401(k)" actually have a mixed account.

I earn well over $150,000 — does that change my 401(k) catch-up options?

Yes, and 2026 is the year it starts biting. Under SECURE 2.0 §603, a participant whose prior-year FICA wages from that employer exceeded $150,000 must make any age-50-or-over catch-up contribution as a Roth contribution. It is not optional and it is not a planning choice — for high earners the catch-up is Roth or it does not happen. The base 2026 deferral limit is $24,500, the age-50 catch-up is $8,000, and there is a larger $11,250 catch-up for ages 60 through 63. If your plan does not offer a Roth option at all, high earners simply cannot make catch-up contributions to it.

Can I take money out of a Roth IRA before 59½ without a penalty?

Your contributions, yes — at any time, for any reason, tax-free and penalty-free. Roth IRA withdrawals follow an ordering rule: contributions come out first, then conversions, then earnings. Earnings are the part that needs both age 59½ and five tax years since your first Roth contribution, and taking them early means tax plus a 10% penalty. Converted amounts have their own five-year clock governing the penalty, which stops mattering once you reach 59½. Note that a Roth 401(k) has no such ordering rule — distributions before the account qualifies come out pro-rata between contributions and earnings, so the flexibility argument applies to the IRA, not the workplace plan.

Doesn't the traditional deduction get reinvested, making it a wash?

Only if you actually reinvest it, and almost nobody does. The textbook result is that Roth and traditional are mathematically identical when your contribution rate and withdrawal rate are the same and you invest the tax you saved. In practice the deduction is spent, which means the Roth contributor is putting more real money to work: $7,500 into a Roth is $7,500 of after-tax purchasing power, while $7,500 into a traditional account is roughly $5,700 of it at a 24% rate, with the other $1,800 usually gone. That behavioural gap is a legitimate argument for Roth that has nothing to do with rate forecasting.

Sources

• IRS Publication 590-A, Contributions to Individual Retirement Arrangements (IRAs) — contribution limits, income phase-outs, and the deduction rules for those covered by a workplace plan.
• IRS Publication 590-B, Distributions from Individual Retirement Arrangements (IRAs) — the Roth ordering rules, the five-year clocks, and required minimum distributions.
• IRS Notice 2025-67 — the 2026 retirement plan cost-of-living adjustments, including the $7,500 IRA limit, the $24,500 elective deferral limit, and the Roth IRA phase-out ranges.
• Rev. Proc. 2025-32 — 2026 tax brackets, standard deduction, and the additional deduction for taxpayers 65 and over.
• One Big Beautiful Bill Act, P.L. 119-21 (4 July 2025) — permanence of the TCJA individual rate structure, and the temporary $6,000 senior deduction for 2025–2028.
• SECURE 2.0 Act §§ 325, 603 and 604 — elimination of Roth 401(k) RMDs, the mandatory Roth catch-up for high earners, and optional Roth employer contributions.
• IRS Uniform Lifetime Table — the 26.5 divisor at age 73 used in the RMD example above.