Roth vs. Traditional IRA Explained: Which Is Better for You?

A traditional IRA gives you a tax deduction now (if you qualify) and taxes withdrawals in retirement. A Roth IRA gives no deduction now, but qualified withdrawals, including all the growth, are tax-free. If your tax rate is the same today and in retirement, the two end up with the same after-tax money. The better choice depends mainly on whether you expect your tax rate to be higher or lower later, plus a few secondary factors such as required minimum distributions and access to contributions.

Side-by-side comparison (2026 rules)

Figures are from the IRS 2026 cost-of-living adjustments (Notice 2025-67).

Traditional IRA deduction limits

Anyone with earned income can contribute to a traditional IRA, but the deduction phases out when a workplace retirement plan is involved. For 2026 the ranges are $81,000 to $91,000 of modified AGI for a single filer covered by a plan, $129,000 to $149,000 for a married couple filing jointly when the contributor is covered, and $242,000 to $252,000 when only the spouse is covered. Without any workplace plan in the household, the deduction is unlimited by income.

The core math: it is all about tax rates

Think of each dollar of salary you want to save. With a traditional IRA, the whole dollar goes in, grows, and is taxed on the way out. With a Roth, the dollar is taxed first, and what is left grows tax-free.

Multiplication does not care about order, so when T_now equals T_later, the results are identical. Whichever rate is lower wins: pay tax when your rate is lowest.

Worked example

You set aside $7,500 of pre-tax salary, you are in the 22% federal bracket, and the money earns 7% a year for 30 years. The growth factor is 1.07³⁰ = 7.6123.

• Roth: after 22% tax, $5,850 goes in and grows to 5,850 × 7.6123 = $44,532, all tax-free.
• Traditional: all $7,500 goes in (deducted) and grows to $57,092, which is taxed on withdrawal.

Retirement withdrawals are taxed on a progressive scale, so the relevant rate is the bracket your last dollars of retirement income fall into, which is often lower than the bracket you are in at your peak earning years. See marginal vs. effective tax rate for why that distinction matters.

The hidden edge of a Roth when you max out

The example compares equal pre-tax cost. If you contribute the full $7,500 limit either way, a Roth shelters more money: $7,500 of after-tax money in a Roth is equivalent to about $9,615 of pre-tax money at a 22% rate. Unless you invest the traditional IRA’s tax savings separately and consistently, the Roth leaves you with more. People who regularly hit the limit often lean Roth for this reason.

When a traditional IRA usually makes sense

• You are in a high bracket now (24% or above) and expect lower income in retirement.
• You need the deduction to lower adjusted gross income, for example to qualify for other credits or income-driven student loan payments.
• You plan to retire in a state with no income tax after working in a high-tax state.
• You expect to do Roth conversions in low-income years between retiring and claiming Social Security.

When a Roth IRA usually makes sense

• You are early in your career, in the 10% or 12% bracket, and expect higher earnings later.
• You value flexibility: contributions can be withdrawn without tax or penalty in an emergency.
• You want to avoid required minimum distributions or leave tax-free money to heirs.
• You already have a large pre-tax 401(k) and want tax diversification, so you can choose which bucket to draw from each year in retirement.
• Your income is too high for a deductible traditional IRA anyway, because you or your spouse has a workplace plan.

Rules that catch people out

1. The limit is shared. $7,500 is the 2026 total across every IRA you own, not per account.
2. You need earned income. Contributions cannot exceed taxable compensation, though a working spouse can fund a spousal IRA for a non-working spouse.
3. The five-year clock. Roth earnings are tax-free only after the first Roth IRA has been open five tax years and you reach 59½ (or meet another qualifying condition).
4. Excess contributions are taxed at 6% a year until corrected. If your income lands in the Roth phase-out range, calculate the reduced limit before you contribute.
5. Backdoor Roth and pro-rata. Converting a nondeductible contribution is taxed in proportion to all pre-tax IRA balances you hold on December 31 of the conversion year.

How to decide in four steps

1. Find your current marginal federal and state rate with the income tax calculator.
2. Estimate retirement income from pensions, Social Security, required withdrawals and other savings, and the bracket it would fall in.
3. Compare the after-tax results in the Roth vs. traditional calculator.
4. If the answer is close, split contributions between the two for tax diversification.

Then project the balance with the Roth IRA calculator or traditional IRA calculator. If your employer offers a match, capture it in the workplace plan first; see how a 401(k) match works.

This guide is general education based on 2026 IRS limits, not tax, legal or financial advice. Tax law changes, and individual circumstances vary; confirm details on irs.gov or with a qualified tax professional.