Robert A. Di Ieso, Jr.
May 24, 2016

Q. Within my 401(k) plan, can I transfer an amount to the 401(k) Roth and pay the taxes from the amount transferred? Or do I have to pay the taxes from another source? — Randy Gaven, Cornville, AZ

A. You raise a good question, and one that more people should be thinking about. A growing number of 401(k)s now offer a Roth account, along with the traditional pre-tax savings plan. A Roth 401(k), like a Roth IRA, lets you put away after-tax savings, which will grow tax-free. (There are a few differences between the two types of accounts, as we’ll explain.) You’re smart to take advantage of the option. Most people keep the bulk of their savings in tax-deferred accounts, so adding a Roth 401(k) allows you to diversify, tax-wise. That gives you more flexibility when it comes time to tapping your portfolio in retirement.

Not all 401(k) plans allow you to make a transfer from a pre-tax account to a Roth–the technical name is an “in-plan rollover.” But if yours does, you can generally make the transfer over the phone. (Fidelity, for one, doesn’t allow online transfers, since the transaction can be a “complicated, confusing process” that merits guidance from a representative, according to a spokesman).

With a Roth 401(k), you can put away a lot more than you can in a Roth IRA: those under age 50 can’t contribute more than $5,500 to a traditional or Roth IRA for 2016, while those 50 and over can’t contribute more than $6,500. What’s more, Roth 401(ks) aren’t subject to the same income limits as Roth IRAs—you’re not eligible to contribute to the latter if you make $132,000 or more if single, and $194,000 or more if married filing jointly.

Now we come to the catch: taxes. The amount you convert from pre-tax savings to a Roth 401(k) is usually counted as part of your taxable income. So what’s the best way to handle that bill? “It’s always a good idea to pay the taxes from an outside source,” said Richard W. Paul, a certified financial planner in Novi, Michigan. Using 401(k) money to pay the taxes will diminish your nest egg and also subject the tax payment to income taxes, plus an additional 10% early withdrawal tax if you’re under age 59½. (The in-plan rollover itself isn’t subject to the early withdrawal tax.)

It’s best to consult a financial adviser or tax preparer before doing a rollover. A professional can estimate the size of the bill and may be able to identify taxable losses or deductions that can offset the added income. You generally have until April 15 of the year following a rollover to pay taxes on the amount, although there may be certain circumstances when it’s advisable to pay earlier—again, check with your tax expert.

Read next: The Five Most Important Years of Your Financial Life

Another point to keep in mind is that there are no do-overs when it comes to in-plan 401(k) rollovers. The amount rolled over into the Roth can’t be moved back to your pre-tax 401(k) account. “Once they pull the trigger on the conversion, it’s a done deal,” Paul said. By contrast, IRA funds may be transferred to a Roth and then back again—this move, called a “recharacterization,” allows you to undo a conversion to a Roth IRA, if you act within a certain time frame.

Is it worthwhile to pay taxes and switch to a Roth 401(k)? It all depends on whether you expect your tax rate to be higher in the future than it is now. No one has a crystal ball, of course. That’s all the more reason to hedge by keeping some money in both pre-tax and after-tax accounts.

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