Liz Weston

Dear Liz: I’m 40. We own our house and have a young daughter. Through my current employer, I’m able to contribute to a regular 401(k) and also a Roth 401(k) retirement account. My company matches 3% if we contribute a total of 6% or more of our salaries. Are there any reasons I should contribute to both my 401(k) and Roth, or should I contribute only to my Roth? My salary and bonus is around $80,000 and I have about $150,000 in my 401(k) and about $30,000 in my Roth. Thanks very much for your time.

Answer: A Roth contribution is essentially a bet that your tax rate in retirement will be the same or higher than it is currently. You’re giving up a tax break now, because Roth contributions aren’t deductible, to get one later, because Roth withdrawals in retirement are tax free.

Most retirees see their tax rates drop in retirement, so they’re better off contributing to a regular 401(k) and getting the tax deduction sooner rather than later. The exceptions tend to be wealthier people and those who are good savers. The latter can find themselves with so much in their retirement accounts that their required minimum distributions — the withdrawals people must take from most retirement accounts after they’re 70½ — push them into higher tax brackets.

That’s why many financial planners suggest their clients put money in different tax “buckets” so they’re better able to control their tax bills in retirement. Those buckets might include regular retirement savings, Roth accounts and perhaps taxable accounts as well. Roths have the added advantage of not having required minimum distributions, so unneeded money can be passed along to your daughter.

Given that you’re slightly behind on retirement savings — Fidelity Investments recommends you have three times your salary saved by age 40 — you might want to put most of your contributions into the regular 401(k) because the tax break will make it easier to save. You can hedge your bets by putting some money into the Roth 401(k), but not the majority of your contributions.