Saving for retirement? How to choose between a traditional and Roth IRA
Fortune · The Good Brigade

If you want to invest for retirement but don’t know where to begin, individual retirement accounts — more commonly referred to as IRAs — are a great place to start.

There are two main types that benefit most savers: traditional IRAs and Roth IRAs. Both accounts let retirement savers stash away $6,000 ($7,000 for those 50 and older) for retirement annually and invest in a variety of funds, and both are tax-advantaged in their own ways. (There are a few other, less commonly used types of IRAs for certain types of workers.)

The key difference between the two is when investors pay taxes. With a traditional IRA, you contribute money pre-tax, meaning you lower your taxable income for the year in which you invest in it, similar to how a 401(k) works. You’re essentially deferring your tax payments.

With a Roth IRA, however, you invest money you’ve already been taxed on. After that, you don’t have to worry about paying taxes on your investments again — including gains — when you take distributions, unless you withdraw money early.

Investing in a Roth vehicle can save you significantly on taxes "when your savings horizon is long, allowing for more time for compounding earnings to grow your account balance, or [if] you believe you are in a lower tax bracket today than you will be when taking distributions in the future," says Amy Ouellette, vice president of product at Vestwell, a 401(k) platform.

Roths are beloved by financial professionals because of the decades of tax-free growth they can enable. And for young workers and others in lower income tax brackets, they’re an especially good deal.

The benefits of a Roth IRA

When you contribute to a Roth IRA, you’re essentially pre-paying your taxes at your current tax rate, which could be lower than your tax bracket will be when you reach retirement, after decades of working and, presumably, growing your income.

Another under-appreciated benefit of Roths: Because you’ve already paid taxes on your contributions, you can take the cash out at any time, without paying a penalty. This only applies to your contributions, not any gains you earn on those investments.

Let’s say you’re contributing $100 a month to your Roth IRA, and half-way through the year, you’re hit with a surprise bill you can’t afford. You can take out $600 from your Roth as a sort of back-up emergency fund without penalty, whereas if you took a distribution from a 401(k) or traditional IRA, you’d owe a 10% penalty and taxes. While you would miss out on the potential investment growth of that $600 moving forward, you'd avoid paying a premium for an unexpected expense. Of course, you also don't want to treat your Roth as a savings account.