Clark Howard Says Skip the Backdoor Roth IRA: Here’s the Math for High Earners

Clark Howard, the consumer advocate behind The Clark Howard Show, has told high-earning listeners to think twice before chasing the backdoor Roth IRA. His position: for couples already maxing a 401(k) and using the mega-backdoor Roth inside their workplace plan, the extra $7,500 per spouse in IRA space rarely justifies the paperwork and tax risk it creates.

The stakes are concrete. A 48-year-old married couple earning $380,000 sits above the Roth IRA direct-contribution phase-out. They can either route $15,000 a year through the back door or skip it. Done wrong, the move triggers a surprise tax bill. Done right, it adds real but modest wealth to a household already saving aggressively elsewhere.

The verdict and the math

Howard’s caution is correct for most households that fit this profile. The backdoor Roth works, but the marginal payoff is smaller than the marketing suggests, and the execution risk is higher.

Run the numbers.

Each spouse contributes $7,500 a year, invested at a 7% return for 20 years. Using the standard annuity factor of 40.99, that grows to roughly $307,000 of tax-free wealth per spouse, or $614,000 combined at age 68.

That is real money. On a $380,000 income, it is a modest addition to an already large savings base. The same couple maxing two 401(k)s at the federal deferral limits plus a mega-backdoor Roth inside the plan typically shelters three to five times more per year than the backdoor IRA adds. The headache, in other words, buys a small slice of an already large pie.

The pro-rata rule trap that wrecks the strategy

The single variable that decides whether the backdoor Roth helps or hurts is whether either spouse holds any pre-tax IRA balance. Old 401(k) rollovers, SEP-IRAs, and deductible traditional IRA contributions all count.

Under IRC Section 408(d)(2), the IRS aggregates every traditional, SEP, and SIMPLE IRA a taxpayer owns when calculating the taxable portion of a Roth conversion. If a spouse converts $7,500 of after-tax contributions while sitting on a $92,500 rollover IRA, the IRS treats only 7.5% of the conversion as basis. The remaining 92.5% is taxable at the household’s marginal rate, which at $380,000 falls in the 24% federal bracket plus state tax.

The fix is a 12-step workaround. Roll the pre-tax IRA balance into the current employer’s 401(k) before December 31 of the conversion year, leaving the traditional IRA at zero. Then make the nondeductible contribution, convert it, and file Form 8606 to document basis. Miss any step, and the math flips against you.

If neither spouse holds a pre-tax IRA balance, the backdoor is clean. The full $7,500 converts tax-free, and the projection above holds. If one spouse does hold a pre-tax balance and skips the rollover step, the conversion can generate $1,800 to $2,000 in unexpected federal tax per spouse, every year the move repeats.

What to do this week

Map your priorities in this order.

First, max both 401(k)s to the federal employee deferral limit. Second, capture any employer match. Third, if your plan allows after-tax contributions plus in-service Roth conversions, run the mega-backdoor Roth inside the 401(k) before touching the IRA backdoor.

Then audit every IRA either spouse owns. Pull the December 31 balance from each custodian. If any pre-tax dollars sit there, call your 401(k) provider and ask whether the plan accepts incoming IRA rollovers. If yes, complete the rollover before attempting the backdoor.

File Form 8606 every year you make a nondeductible contribution. The form establishes the basis, and without it, the IRS can tax the same dollars twice. Treat the backdoor Roth as a tool for a specific job, not a goal in itself. If your 401(k) is already doing the heavy lifting, Howard is right that the extra paperwork rarely earns its keep.