The core difference: when you pay taxes

A Roth IRA lets you contribute money that has already been taxed, and then withdraw it tax-free in retirement. A traditional IRA lets you deduct your contributions from your taxable income now, but you pay income tax on the money when you withdraw it later. That single difference — tax now versus tax later — shapes almost everything else about how each account works.

Which one makes sense depends on whether you think your tax rate will be lower or higher in retirement than it is today. If you expect to earn less in retirement, a traditional IRA saves you money because you deduct contributions at a higher rate now and pay tax at a lower rate later. If you expect to earn the same or more, or if you simply want to lock in your current tax rate and never pay tax on the growth, a Roth IRA is usually the better choice.

Key Takeaways

  • Roth contributions use after-tax dollars but grow and withdraw tax-free; traditional contributions reduce your taxable income now but are taxed as income when withdrawn.
  • Roth IRAs have no required withdrawals in your lifetime, while traditional IRAs force you to start withdrawing at age 73 (as of 2023).
  • You can withdraw Roth contributions (not earnings) at any time without penalty; traditional IRA withdrawals before age 59½ usually trigger a 10 percent penalty plus income tax.
  • Income limits restrict who can contribute to a Roth IRA directly, but there is no income limit for traditional IRAs.
  • Both accounts have the same annual contribution limit, which changes yearly based on inflation.

Contribution limits and income restrictions

Both account types share the same annual contribution limit. For 2024, you can contribute up to $7,000 per year if you are under age 50, or $8,000 if you are 50 or older (the extra $1,000 is called a catch-up contribution). These limits change each year as the IRS adjusts them for inflation.

A traditional IRA has no income limit — anyone with earned income can open one and deduct contributions, though the deduction phases out if you or your spouse have a workplace retirement plan and earn above a certain threshold. A Roth IRA, by contrast, has strict income limits. For 2024, you cannot contribute directly to a Roth if your income exceeds $146,000 (single) or $230,000 (married filing jointly). These thresholds also change yearly. If your income is too high for a direct Roth contribution, you may be able to use a "backdoor Roth" strategy, which involves contributing to a traditional IRA and then converting it to a Roth, though this has its own rules and tax consequences.

Withdrawals before retirement and the 59½ rule

The two accounts treat early withdrawals very differently. With a traditional IRA, any withdrawal before age 59½ is subject to income tax plus a 10 percent penalty, with limited exceptions (such as disability, medical expenses above a threshold, or first-time home purchase up to $10,000). This makes early access expensive and is one reason traditional IRAs are meant for long-term retirement savings.

A Roth IRA is more flexible. You can withdraw your contributions (the money you put in) at any time, tax-free and penalty-free, because you already paid tax on that money. You cannot withdraw the earnings (investment gains) before age 59½ without triggering a 10 percent penalty and income tax, but the ability to access contributions without penalty makes a Roth useful as an emergency backup, though it should not be your first choice for that purpose.

Required withdrawals in retirement

Once you reach a certain age, the IRS requires you to start withdrawing money from a traditional IRA. As of 2023, that age is 73 (it was 72 before the SECURE Act 2.0 changed the rule). The amount you must withdraw each year is calculated based on your age and account balance, and it is called a required minimum distribution or RMD. If you do not take the RMD, you owe a 25 percent penalty on the amount you should have withdrawn (reduced to 10 percent if you correct it within two years).

A Roth IRA has no required minimum distributions during your lifetime. You can leave the money in the account to grow indefinitely and withdraw only what you need, or nothing at all. This makes a Roth useful if you do not need the money in retirement or want to pass a larger balance to heirs. Your heirs will eventually have to withdraw the money, but the timeline is longer than with a traditional IRA.

Tax treatment of investment growth

Both accounts allow your money to grow without annual tax on dividends or capital gains — that is one of the main reasons to use either account instead of a regular taxable brokerage account. The difference is what happens when you withdraw that growth.

In a traditional IRA, all withdrawals are taxed as ordinary income, whether the money came from your contributions or from investment gains. In a Roth IRA, withdrawals of earnings are tax-free as long as you are age 59½ and the account has been open for at least five years (the "five-year rule"). This means a Roth is especially valuable if you expect strong investment returns, because all that growth escapes taxation entirely.

Conversions and the backdoor Roth

You can convert money from a traditional IRA to a Roth IRA at any time, regardless of your income. When you do, you owe income tax on the amount converted in that tax year. This is useful if you have a traditional IRA and your income later drops (such as in a year you take unpaid leave or retire early), because you can convert at a lower tax cost. It is also the basis of the "backdoor Roth" strategy: contribute to a traditional IRA, then immediately convert it to a Roth, paying tax only on any earnings that accumulated in the meantime.

Be aware that if you have other traditional IRAs, SEP IRAs, or SIMPLE IRAs, the IRS treats them as one pool for tax purposes when you convert. This can create an unexpected tax bill if you have a large balance in other traditional accounts. Consult a tax professional before converting if you have multiple IRA accounts.

Which account to choose

Choose a Roth IRA if you are young, expect your income to rise, want tax-free growth and withdrawals, or value the flexibility of accessing contributions early. Choose a traditional IRA if you want to reduce your taxable income this year, expect to be in a lower tax bracket in retirement, or your income is too high for a Roth contribution and you cannot or do not want to use a backdoor conversion.

Many people benefit from having both — contributing to a traditional IRA to lower current taxes and a Roth to build tax-free retirement savings. The key is to contribute to at least one of them consistently, because the tax advantages only work if you actually use the account.

Frequently Asked Questions

Can I have both a Roth and a traditional IRA at the same time?

Yes. Your combined contributions across all IRAs cannot exceed the annual limit (currently $7,000 or $8,000 if age 50+), but you can split that between a Roth and a traditional IRA however you choose. Many people do this to get some tax deduction now and some tax-free growth later.

What is the five-year rule for Roth IRAs?

To withdraw earnings tax-free from a Roth, the account must have been open for at least five tax years and you must be age 59½. The five-year clock starts on January 1 of the year you open your first Roth IRA, not on the date you fund it. If you convert a traditional IRA to a Roth, a separate five-year clock starts for that conversion.

If I earn too much for a Roth, am I stuck with a traditional IRA?

No. You can use a backdoor Roth by contributing to a traditional IRA and converting it to a Roth in the same year. You will owe tax on any earnings that accumulated, but the strategy works regardless of income. There is no income limit on conversions, only on direct contributions.

Do I have to take money out of my Roth IRA in retirement?

No. Unlike a traditional IRA, a Roth has no required minimum distributions during your lifetime. You can leave it untouched and pass it to heirs, or withdraw only what you need. Your beneficiaries will have to withdraw the balance, but on a longer timeline than with a traditional IRA.

Which account is better for long-term growth?

A Roth is usually better if you have a long time horizon, because all growth is tax-free and you never have to withdraw it. A traditional IRA makes sense if you want to reduce taxes now and expect lower income later. The best choice depends on your current tax bracket and what you expect in retirement.