The core difference: when you pay taxes

A Traditional IRA lets you deduct contributions from your income taxes now, but you pay taxes on the money when you withdraw it in retirement. A Roth IRA takes the opposite approach: you contribute after-tax dollars now, and withdrawals in retirement are tax-free. Neither is universally "better"—which one makes sense depends on your current tax bracket, how much you expect to earn in retirement, and how long you plan to keep the money invested.

The choice also depends on whether you have access to a workplace retirement plan. If your employer offers a 401(k) or similar plan, your ability to deduct Traditional IRA contributions phases out at higher incomes. A Roth has no income limit for contributions, though there are income limits for converting a Traditional IRA to a Roth.

Key Takeaways

  • Traditional IRAs reduce your taxable income this year but require you to pay taxes on withdrawals later; Roths use after-tax money now and let you withdraw tax-free later.
  • If you expect to be in a lower tax bracket in retirement than you are now, a Traditional IRA usually saves you more money overall.
  • If you expect to be in a higher tax bracket in retirement, or you want tax-free growth and withdrawals, a Roth usually makes more sense.
  • You must start taking withdrawals from a Traditional IRA at age 73; Roths have no required withdrawal age during your lifetime.
  • Roth IRAs have no income limit for contributions, but Traditional IRA deductions phase out if you have a workplace retirement plan and earn above a certain amount.

When a Traditional IRA usually saves more money

A Traditional IRA is often the better choice if you are in a high tax bracket now and expect to be in a lower one in retirement. For example, if you earn $120,000 this year and contribute $7,000 to a Traditional IRA, you reduce your taxable income to $113,000. That saves you roughly $2,100 in federal taxes (at the 30% combined federal and state rate). When you withdraw that $7,000 in retirement and you are in the 22% bracket, you pay $1,540 in taxes—a $560 net gain.

This scenario is common for people who plan to retire early, move to a state with no income tax, or expect significantly lower income in retirement. It also works well if you are self-employed or a contractor with variable income—you can contribute more in high-income years and less in low-income years, smoothing your tax burden.

Traditional IRAs also let you deduct contributions immediately, which can free up cash flow now. If you are trying to lower your adjusted gross income to reach a tax credit or deduction threshold, a Traditional IRA contribution can help.

When a Roth IRA usually makes more sense

A Roth is often better if you are in a lower tax bracket now and expect to be in a higher one in retirement, or if you simply want to lock in today's tax rates. If you are 25 years old, earning $45,000, and expect to earn $150,000 by retirement, a Roth lets you pay tax on the $45,000 income now (at 12%) rather than pay tax on withdrawals later at a higher rate.

Roths also have no required withdrawals during your lifetime. A Traditional IRA requires you to start taking withdrawals at age 73, whether you need the money or not. If you do not need retirement income and want to leave money to heirs, a Roth avoids forced withdrawals and lets the account grow tax-free for decades longer.

A Roth is also the only choice if your income is too high to deduct Traditional IRA contributions. If you earn more than the phase-out range for your filing status and have a workplace retirement plan, you cannot deduct a Traditional IRA contribution—but you can still contribute to a Roth (up to the annual limit).

Income limits and how they affect your choice

Roth contributions have income limits that change each year. For 2024, if you are single, you can contribute the full amount if you earn less than $146,000; the amount phases out between $146,000 and $161,000. If you are married filing jointly, the phase-out range is $230,000 to $240,000. These numbers increase slightly each year.

Traditional IRA contributions have no income limit, but the tax deduction phases out if you have a workplace retirement plan and earn above a certain amount. For 2024, if you are single with a workplace plan, the deduction phases out between $77,000 and $87,000 of income. If you are married filing jointly and your spouse has a workplace plan, it phases out between $123,000 and $143,000.

If you earn above these limits, you have three options: contribute to a Traditional IRA without deducting it (and track basis carefully), contribute to a Roth if you are below the Roth limit, or contribute to a workplace plan like a 401(k) if your employer offers one.

Tax-free growth and withdrawal flexibility

Both account types grow tax-free while the money is invested. The difference is what happens when you withdraw. With a Traditional IRA, every dollar you withdraw is taxed as ordinary income. With a Roth, you withdraw contributions tax-free anytime, and earnings are tax-free if you are at least 59½ and have held the account for at least five years.

This matters if you might need money before retirement. You can withdraw Roth contributions (not earnings) without penalty at any time. Traditional IRA withdrawals before age 59½ trigger a 10% penalty plus income tax, with narrow exceptions like first-time home purchase (up to $10,000 lifetime) or medical expenses over 7.5% of adjusted gross income.

Roth accounts also let you pass tax-assistance programs to heirs. A beneficiary who inherits a Roth can withdraw the balance tax-free (though they must follow new rules about how quickly to empty the account). A Traditional IRA beneficiary pays income tax on withdrawals.

Required withdrawals and estate planning

At age 73, you must start taking required minimum distributions (RMDs) from a Traditional IRA. The amount is calculated based on your age and account balance, and you pay income tax on every withdrawal. Missing an RMD triggers a 25% penalty on the amount you should have withdrawn (reduced to 10% if you correct it within two years).

Roth IRAs have no RMD requirement during your lifetime. This is a major advantage if you do not need the money and want the account to keep growing. It also simplifies estate planning—you are not forced to withdraw and pay tax on money you do not need.

If you have both a Traditional and a Roth IRA, the RMD rule applies only to Traditional accounts. You calculate the RMD for each Traditional IRA separately, but you can withdraw the total from any one of them.

Converting between account types

You can convert money from a Traditional IRA to a Roth, but you pay income tax on the amount converted in that tax year. For example, if you convert $50,000 and you are in the 24% bracket, you owe $12,000 in federal taxes. This is sometimes worth doing if you expect tax rates to rise, if you are in a low-income year, or if you want to reduce future RMDs.

There is no income limit for conversions, even if you earn too much to contribute to a Roth directly. Some people use this strategy—called a "backdoor Roth"—to get money into a Roth when their income is too high. However, if you have existing Traditional IRA balances, the conversion is more complicated because of the "pro-rata rule," which requires you to count all Traditional IRAs together when calculating the tax owed.

Frequently Asked Questions

Can I have both a Traditional IRA and a Roth IRA?

Yes, but your total contributions to both accounts combined cannot exceed the annual limit (currently $7,000 for those under 50, or $8,000 if you are 50 or older). You can split the money however you want between the two accounts.

What happens if I need money before retirement?

With a Roth, you can withdraw your contributions anytime without penalty or tax. With a Traditional IRA, withdrawals before age 59½ are taxed as income plus a 10% penalty, except in narrow cases like first-time home purchase or unreimbursed medical expenses. This makes Roths more flexible if you are unsure whether you will need the money.

Which account is better for long-term growth?

If you have decades until retirement, a Roth usually wins because tax-free growth compounds over time. However, if you are in a much higher tax bracket now than you expect in retirement, a Traditional IRA's immediate tax deduction may save you more money overall. Run the math with your actual numbers.

Do I have to pay taxes when I convert a Traditional IRA to a Roth?

Yes, you pay income tax on the amount converted in that tax year. If you convert $50,000, you owe tax on $50,000 of income. This is why conversions are often done in low-income years or when you are between jobs.

What if my income is too high for a Roth?

You can still do a backdoor Roth: contribute to a Traditional IRA (non-deductible if your income is too high), then immediately convert it to a Roth and pay tax only on any earnings. This works only if you have no other Traditional IRA balances, or you will owe tax on a portion of the conversion.