Roth vs Traditional IRA: a decision framework

Both Roth and Traditional IRAs are individual retirement accounts with the same annual contribution cap ($7,000 in 2026, $8,000 if you're 50 or older) and the same eligible investments. The difference is when you pay tax — and that single decision can mean tens of thousands of dollars over a lifetime.

The choice usually comes down to two questions, both of which you can answer without a calculator.

What Traditional and Roth actually do

• Traditional IRA. Contributions are pre-tax (assuming you qualify for the deduction — see below). The money grows tax-free, and you pay ordinary income tax on withdrawals in retirement. Required minimum distributions (RMDs) start at age 73.
• Roth IRA. Contributions are post-tax — no upfront deduction. The money grows tax-free, and qualified withdrawals are tax-free, including all the growth. No RMDs during your lifetime.

In both cases, you contribute the same amount. The difference is the tax pattern, not the deposit limit.

Question 1: Will you pay a higher or lower tax rate later?

This is the central trade-off. A Traditional IRA shifts the tax bill to your retirement years; a Roth pays the tax now and shields all future withdrawals.

If you expect your marginal tax rate in retirement to be higher than today's, Roth wins. You're locking in today's lower rate. This describes most early-career workers, residents and graduate students, and anyone in a temporary low-income year.

If you expect your retirement rate to be lower, Traditional wins. You take the deduction at your peak rate and pay tax later at a lower one. This typically applies to high-earning professionals near peak income.

When in genuine doubt, splitting contributions (some to each) is a defensible hedge.

Question 2: Do you qualify, and is the deduction available?

The Roth has income limits — single filers can fully contribute up to $150,000 modified AGI in 2026; the phase-out ends at $165,000. Above that, direct Roth contributions are blocked (though the "backdoor Roth" using a non-deductible Traditional + immediate conversion remains available).

The Traditional IRA deduction has income limits if you or your spouse are covered by a workplace plan. Above the deduction phase-out, you can still contribute to a Traditional — you just don't get the upfront deduction. That eliminates the main reason to choose Traditional over Roth.

For most high earners with workplace plans, the Traditional IRA's "no deduction" version is strictly worse than a Roth. The Roth (or backdoor Roth) is the right call.

Why early-career workers should usually pick Roth

Three reinforcing reasons:

1. Lower current tax bracket. A new graduate paying 12% federal would much rather pay tax now than risk paying 22-32% on the same dollar in 30 years.
2. Longer compounding window. Every dollar of growth is tax-free forever. The longer the runway, the more growth, the more tax saved.
3. More flexibility. Roth contributions (not earnings) can be withdrawn at any time, tax- and penalty-free. That's not true of Traditional withdrawals before 59½.

Where Traditional still wins

• You're in a peak earning year (32%+ federal marginal) and expect to retire at a lower bracket.
• You need the deduction this year for cash-flow reasons.
• You expect to relocate to a no-tax state in retirement — the federal tax savings get compounded by state tax savings.

The practical answer for most readers

If you're under 35, in the 12% or 22% federal bracket, and not maxing every retirement account: Roth IRA. The deduction you'd give up is small; the tax-free growth window is the asset.

If you're at peak earnings, your spouse has a workplace plan, and you're in the 32%+ federal bracket: Traditional IRA if you qualify for the deduction, backdoor Roth if you don't.

If you can't decide: half each. The IRS allows split contributions; pick the percentages that match your conviction level.