Dear Liz: My husband and I are in our late 40s. We’re in a good financial position and trying to max out our retirement savings. We have small traditional IRAs and are now above the income limit to deduct contributions to it. We have Roth IRAs that we converted from traditional IRAs several years ago (our income is borderline for being able to contribute directly to a Roth). We also recently got a Health Savings Account that we are maxing out and saving for retirement. But the bulk of our retirement savings is in our 401(k)s, which we max out every year. I hear I should have a mix of pre-tax and after-tax sources of income in retirement. Can I wait until the first year we retire and roll some of my 401(k) into a traditional IRA and then convert it to a Roth, at presumably a lower tax rate due to lower income? Or would it be better to contribute now to a Roth 401(k) at work instead of a regular 401(k), even knowing that our tax rate will probably be lower in retirement?

Answer: You already have a mix of pre- and after-tax sources of income in retirement. Withdrawals from your Roth IRAs will be tax free in retirement, as will your HSA withdrawals if they’re used for medical expenses.

Roth conversions and contributions to Roth 401(k)s make the most sense when you expect to be in a higher tax bracket in retirement, rather than a lower one. Otherwise, you’re giving up a tax break now (your deductible contributions) for what’s likely to be a lesser tax benefit later. Conversions at retirement are particularly tricky, since you may not have decades of tax-free compounding ahead of you to make up for the fact that you accelerated the tax bill.

Talk to a tax pro, but it’s likely that maxing out your regular 401(k)s is the best move.