If you are in your 20s and ready to open an individual retirement account (IRA) to save for retirement, you’ll have two basic types to choose from: traditional or Roth. Which would be right for you? In most cases, the answer will be a Roth. Here’s why.

Roth vs. Traditional IRAs

A traditional IRA provides a tax deduction for your contributions and a tax deferral on any gains in the account until you withdraw the money. Once you begin making withdrawals, they will be taxed based on your tax bracket at the time.

Roth IRA contributions, on the other hand, are not tax deductible, but your withdrawals can be tax-free if you follow the rules.

Younger investors who are just starting out in their careers tend to be in lower tax brackets and don’t benefit as much from the tax deductions for contributions to a traditional IRA as older investors in higher brackets may. In addition, the younger you are, the more time that your account will have to grow and compound—and with a Roth, all of that money can be tax-free someday. Here’s a closer look at how each type of IRA works and why a Roth is usually a wiser choice for 20-somethings, especially if they can afford to forgo an immediate tax deduction.

Traditional IRA Tax Benefits

Traditional IRAs have been around since the 1970s and were once the only choice that people had. While their tax benefits provided an attractive incentive for Americans to save for retirement, the government wanted its cut eventually.

As a result, traditional IRAs can trigger a big tax bill when account holders begin to withdraw their money. The government also made withdrawals mandatory after a certain age, currently 73 if you were born between 1951 and 1959 and 75 if you were born in 1960 or after. Those are known as required minimum distributions (RMDs).

Here is a somewhat simplified example of how a traditional IRA can grow in value, while also accumulating a substantial tax obligation:

Suppose you’re 23 years old, currently earn $50,000 annually, and contribute the maximum allowed of $6,500 for 2023 to a traditional IRA. Because you are in the 22% tax bracket, your tax deduction for your IRA contribution will save you approximately $1,430 in federal income tax.

Now suppose you continue to contribute $6,500 each year to your traditional IRA until you are 63 years old (40 years multiplied by $6,500 = $260,000), and your traditional IRA grows to $1.8 million by that time (this is possible at an 8% annual return). If all of your contributions were fully deductible, then you saved $57,200 in taxes over the 40 years, assuming (for the sake of simplicity) that you remained in the 22% tax bracket. At age 63, you decide to retire and withdraw $50,000 a year from your traditional IRA for living expenses. If you are still in that 22% tax bracket, you will owe $11,000 in federal income tax on each $50,000 withdrawal every year thereafter. In other words, you’ll net just $39,000.

If you’re in a higher tax bracket when you begin making withdrawals—either because you have more income or because tax rates have gone up overall—you could owe more still. And remember, once you hit age 75, you’ll have no choice but to start taking withdrawals and paying taxes on them.

Roth IRA Tax Benefits

The Roth IRA, introduced in 1997, works differently. Suppose that you contribute the same $6,500 a year for 40 years to a Roth IRA. You don’t get any tax deduction, but the Roth IRA still grows to $1.8 million—assuming the same 8% annual return. At age 63, you start to withdraw $50,000 per year.

The difference now is that there is no tax due on the Roth withdrawal because distributions from a Roth are tax-free as long as you have had a Roth account for at least five years and reached age 59½. In this scenario, you can withdraw $50,000 (or as much as you want) and keep the full amount.

Another key difference between Roth and traditional IRAs is that Roths are never subject to RMDs during the original owner’s lifetime. So if you don’t need the money, you can simply pass it along to your heirs when you die. They’ll have to withdraw it eventually, but their withdrawals can also be tax-free.

The Bottom Line

Because of the Roth IRA’s unique tax benefits, 20-somethings who are eligible should seriously consider contributing to one. A Roth IRA can be a wiser long-term choice than a traditional IRA, even though contributions to traditional IRAs are tax deductible.