An individual retirement arrangement (IRA) is a personal savings plan that offers specific tax benefits. IRAs are one of the most powerful retirement savings tools available to you. Even if you’re contributing to a 401(k) or other plan at work, you might also consider investing in an IRA.

What types of IRAs are available?

The two major types of IRAs are traditional IRAs and Roth IRAs. Both allow you to contribute as much as $5,500 in 2018 (unchanged from 2017). You must have at least as much taxable compensation as the amount of your IRA contribution. But if you are married filing jointly, your spouse can also contribute to an IRA, even if he or she has little or no taxable compensation, as long as your combined compensation is at least equal to your total contributions. The law also allows taxpayers age 50 and older to make additional “catch-up” contributions. These folks can contribute up to $6,500 in 2018 (unchanged from 2017).

Both traditional and Roth IRAs feature tax-sheltered growth of earnings. And both give you a wide range of investment choices. However, there are important differences between these two types of IRAs. You must understand these differences before you can choose the type of IRA that’s best for you.

Note: Special rules apply to certain reservists and national guardsmen called to active duty after September 11, 2001.

Choose the right IRA for you

Assuming you qualify to use both, which type of IRA is best for you? Sometimes the choice is easy. The Roth IRA will probably be a more effective tool if you don’t qualify for tax-deductible contributions to a traditional IRA. However, if you can deduct your traditional IRA contributions, the choice is more difficult. The Roth IRA may very well make more sense if you want to minimize taxes during retirement and preserve assets for your beneficiaries. But a traditional deductible IRA may be a better tool if you want to lower your yearly tax bill while you’re still working (and probably in a higher tax bracket than you’ll be in after you retire). A financial professional or tax advisor can help you pick the right type of IRA for you.

Note: You can have both a traditional IRA and a Roth IRA, but your total annual contribution to all of the IRAs that you own cannot be more than $5,500 for 2018 ($6,500 if you’re age 50 or older).

Know your options for transferring your funds

You can move funds from an IRA to the same type of IRA with a different institution (e.g., traditional to traditional, Roth to Roth). No taxes or penalty will be imposed if you arrange for the old IRA trustee to transfer your funds directly to the new IRA trustee. The other option is to have your funds distributed to you first and then roll them over to the new IRA trustee yourself. You’ll still avoid taxes and penalty as long as you complete the rollover within 60 days from the date you receive the funds.

You may also be able to convert funds from a traditional IRA to a Roth IRA. This decision is complicated, however, so be sure to consult a tax advisor. He or she can help you weigh the benefits of shifting funds against the tax consequences and other drawbacks.

Note: The IRS has the authority to waive the 60-day rule for rollovers under certain limited circumstances, such as proven hardship.