Roth vs. Traditional IRA: Which Should You Choose?

A Roth IRA and a traditional IRA can hold exactly the same investments. The difference is when the IRS collects its share. With a traditional IRA you may get a deduction today and pay income tax on every dollar you withdraw in retirement. With a Roth IRA you contribute money that has already been taxed, and qualified withdrawals are completely tax-free. That single timing difference drives almost everything else, so the useful question isn't which account is better in general. It's whether your tax rate is likely to be higher now or later, and whether you qualify for the tax break in the first place.

Side-by-Side Comparison

2026 Limits: Can You Contribute or Deduct?

You can put in up to $7,500 for 2026, or $8,600 if you're 50 or older. That cap covers all of your IRAs together, and you can't contribute more than you earned from work that year, though a working spouse can fund an IRA for a non-working spouse. Contributions for 2026 are accepted until the April 2027 filing deadline. Whether you get the full tax benefit depends on your modified adjusted gross income (MAGI):

If you're married filing separately and lived with your spouse during the year, both phase-outs run from just $0 to $10,000. If neither you nor your spouse is covered by a workplace plan, a traditional IRA is fully deductible at any income.

Inside a phase-out, your limit shrinks in proportion to how far through the range you are. A single filer under 50 with a MAGI of $160,000 is 7,000 / 15,000 of the way through the Roth range, so the allowed contribution is $7,500 × (1 - 0.4667) = $4,000. A single filer with a 401(k) and a MAGI of $85,000 is 40% through the deduction range and can deduct $7,500 × 0.60 = $4,500.

Worked Examples: Same Income, Different Tax Rates

To compare fairly, the first three examples start with the same $7,500 of pre-tax earnings. In the traditional IRA, all $7,500 is invested because the deduction wipes out the tax. In the Roth, you pay tax first and invest what's left. Each account then earns 7% a year for 30 years, which multiplies the money by about 7.61.

Example 1: The tax rate doesn't change

At 22% both now and later, the Roth invests $7,500 × 0.78 = $5,850, which grows to $44,532. The traditional IRA invests $7,500, grows to $57,092, and loses 22% on withdrawal, also leaving $44,532. They match because multiplication works in any order: taxing the money before or after growth gives the same answer. The growth itself isn't what separates these accounts. The tax rate is.

Example 2: Your income is likely to rise

A 25-year-old in the 12% bracket (for 2026, taxable income up to $50,400 if single) pays only $900 in tax to invest $6,600 in a Roth, which grows to $50,241 tax-free. The traditional IRA's $57,092 would owe about $12,560 at a 22% rate in retirement. Verdict: paying tax while your rate is low is the Roth's best case.

Example 3: You're in your highest-earning years

A self-employed single filer in the 24% bracket with no workplace plan keeps the full deduction. A Roth would invest only $5,700 and end up at $43,390. The traditional IRA's $57,092 is taxed at 12% in a modest retirement, leaving $50,241. Verdict: deducting at a high rate and withdrawing at a low one is the traditional IRA's best case. Note the condition, though. If this person had a 401(k), an income in the 24% bracket would be far above the $91,000 limit and the deduction would disappear, so the Roth would be the better IRA.

Example 4: You can afford to max it out

The first three examples assume you'd invest the same pre-tax income. But the limit is the same $7,500 for both accounts, and a Roth dollar is worth more because it's already taxed. Suppose you're at 22% now and later and contribute the full $7,500 either way. The Roth grows to $57,092, all yours. The traditional IRA also grows to $57,092, but after 22% tax you keep $44,532. You did save $1,650 in tax up front, and if you invest that in a taxable account earning 6% after tax drag, it grows to about $9,477, for a total of $54,008. The Roth comes out about $3,083 ahead at identical tax rates. Verdict: if you're maxing out your IRA, the Roth effectively lets you shelter more money.

What the Tax-Rate Math Leaves Out

• Your withdrawal rate may be lower than you think. Your deduction today comes off your top bracket, but retirement withdrawals fill the 0%, 10%, and 12% layers first. If you have little other income, your average rate on traditional withdrawals can be well below your marginal rate.
• Roth withdrawals don't raise your other costs. Traditional withdrawals count toward the income test for taxing Social Security benefits and for Medicare premium surcharges. Qualified Roth withdrawals don't.
• A Roth doubles as a backup fund. You can pull out your contributions at any time, though every dollar withdrawn gives up its future growth. Don't treat it as a substitute for a real emergency fund.
• Heirs inherit it differently. Most non-spouse beneficiaries must empty an inherited IRA within 10 years. Inherited traditional money is taxable to them, while qualified Roth money generally is not.
• Nobody knows future tax law. Holding both pre-tax and Roth money lets you choose which to draw from each year. If you already have a large pre-tax 401(k), adding Roth dollars is often the simplest way to diversify.

Which One Should You Choose?

• Choose a Roth IRA if you're early in your career, in the 10% or 12% bracket, can max out the account, or have a workplace plan that makes a traditional IRA nondeductible.
• Choose a traditional IRA if you can take the full deduction, are in your peak earning years, and expect meaningfully lower income in retirement.
• Split your contribution if you honestly can't tell. Any division works as long as the total stays within the annual limit.
• Look at your 401(k) match first. If your employer matches contributions, capture the full match before funding an IRA. It's an immediate return no IRA can beat. Model it with the 401(k) calculator.

Common Mistakes to Avoid

• Making a nondeductible traditional contribution by accident. Without the deduction, you've given up the Roth's tax-free growth and gained very little. If you do make one, file IRS Form 8606 to track your basis, or you could be taxed on that money twice.
• Over-contributing. Excess contributions face a 6% excise tax for each year they stay in the account. Watch this if your income lands near a Roth phase-out, and remember the limit covers all your IRAs combined.
• Attempting a backdoor Roth without checking your balances. The pro-rata rule looks at all of your traditional, SEP, and SIMPLE IRA balances, so a conversion can be largely taxable if you hold pre-tax IRA money.
• Forgetting the five-year clock. Roth earnings need five tax years from your first Roth IRA contribution, plus age 59½ or another qualifying event, to come out tax-free. Opening an account early, even with a small amount, starts the clock.
• Leaving contributions in cash. An IRA is only a container. Money sitting in a settlement fund doesn't earn the kind of growth these examples assume, so make sure you actually choose an investment.

Run Your Own Numbers

Start by finding your marginal rate with the income tax calculator, then estimate what you'll withdraw each year in retirement with the retirement withdrawal calculator. If the first rate is lower than the second, lean Roth. Then use the Roth IRA calculator to see what steady contributions could grow into, and try the compound interest calculator to test different return assumptions.

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