A North Carolina listener recently called into the Clark Howard podcast to ask about backdoor IRAs, a legal strategy that allows high-income earners to bypass income limits on Roth IRA contributions.
On the April 22 episode of his podcast, Clark Howard fielded a question from a high-earning North Carolina listener already running backdoor Roth conversions, and gave one of the most prescriptive answers in personal finance: “Overwhelmingly, I’d say probably 95% of wage earners would be better off going all in on Roth 401(k) instead of traditional 401(k).” The stakes are bigger than that number suggests.
If you take Howard’s advice and your income profile fits, you build a retirement bucket the IRS cannot tax again, and you sidestep a Medicare surcharge most savers do not see coming. If your income profile does not fit, you give up a deduction worth real money during your highest-earning years and may end up with a smaller nest egg than the traditional route would have produced.
The Verdict: Howard Is Right for Most Workers, With One Hard Threshold
Howard’s advice holds up for the vast majority of W-2 earners, resting on three mechanics that compound on each other.
The first is tax-free growth. Money inside a Roth 401(k) is funded with after-tax dollars, then grows untaxed and comes out untaxed in retirement. A traditional 401(k) defers tax to a future rate you cannot predict. With the federal funds rate at 3.75% and federal debt where it is, betting that future tax rates will be lower than today’s is the speculative position.
The second is the contribution math Howard flagged directly. Maxing a Roth 401(k) requires more out-of-pocket cash than maxing a traditional, because you pay the tax up front instead of letting the IRS take it later. “You won’t have the money to put into the regular investment brokerage account, but the advantage is enormous down the road because that money will have grown tax-free and you’ll spend it tax-free,” Howard told the caller. The brokerage side account most savers plan to fund with their tax savings rarely gets fully funded in practice, and every dividend and capital gain is taxable along the way. The Roth account has none of that drag.
The third is the one most savers miss entirely: Medicare IRMAA. “If you have too much money in traditionals, you get hit with a massive penalty every month, a financial penalty on receiving Medicare in retirement,” Howard said. Required minimum distributions from traditional 401(k)s and IRAs count as income, and once that income clears certain thresholds, your Medicare Part B and Part D premiums climb in tiers. Roth distributions do not count toward those thresholds. A retiree with seven figures in a traditional 401(k) can quietly pay thousands of extra dollars in Medicare premiums every year for life.
Howard’s $500,000 Line
Howard drew a sharp threshold. “If you’re earning $500,000 a year or more, huge money. Then you may well benefit from doing a mix of a traditional 401(k) and a Roth 401(k). If your earnings are meaningfully below $500,000, you would benefit by going fully into the Roth 401(k).”
At high seven-figure household incomes, today’s marginal federal rate is almost certainly higher than the rate you will face on retirement withdrawals, so a partial deduction now has real present value. Below that line, the gap narrows, and the Medicare and tax-free-growth advantages tip the math toward Roth.
Who This Fits and Who It Doesn’t
The Roth-everything approach fits the dual-income professional couple earning a combined $200,000 to $400,000, decades from retirement, who can absorb the higher up-front tax cost without cutting their contribution rate. It fits the early-career worker in a low bracket today who expects raises. It fits anyone already maxing a 401(k) with a long compounding runway.
It fits less well for the saver in their peak earning years above Howard’s $500,000 line, the worker in a high-tax state who plans to retire in a no-tax state, and the late-career employee five years from retirement who will draw the money down before tax-free compounding has time to work. For those profiles, a blend makes sense.
The Backdoor Detail and What to Do This Week
For high earners locked out of direct Roth IRA contributions, Howard described the workaround: “There’s this obscure creature called a non-deductible IRA that has no income limits on it. And people can do a non-deductible IRA, and if you jump through the right hoops, you can then virtually immediately convert it into Roth IRA money.” The pro-rata rule and existing IRA balances complicate this, which is why Howard pointed to it without prescribing it.
The action step is concrete. Pull up your 401(k) portal this week. Check whether your plan offers a Roth 401(k) option. If your household income sits below Howard’s $500,000 line and you are currently routing contributions to traditional, switch the election for new contributions and run the numbers on whether you can absorb the higher net paycheck cost without dropping your contribution rate.
Howard’s 95% figure is a ceiling. The Roth advantage compounds quietly for decades, and the Medicare premium surcharge it helps you avoid is a cost most savers never see until the bill arrives.
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