Why Roth Conversions Backfire for Most Retirees: The $12,000 Tax Bill Nobody Plans For

"When the tax bill comes due 3 months later, 6 months later, a year later, people forget all the glory of Clark Howard talking about the Roth. And you know what they remember? $12,000 tax bill."

"I might as well have been Senator Roth from Delaware. I'm so into the Roth. So then you get blinders on and you don't see the downsides."

"Federal tax brackets are marginal. A married couple in the 24% bracket isn't paying 24% on their whole income. Their first dollars get taxed at 10%, then 12%, then 22%, and only the top slice hits 24%. Moss's point: the effective rate in the 24% bracket lands around 16% to 18%, but a Roth conversion gets stacked on top of everything else and pays the full 24% on every converted dollar."

"A retired couple converts $50,000 from a traditional IRA to fill up the 24% bracket. The IRS treats that conversion as ordinary income. The bill: roughly $12,000, due with next April's return. That $12,000 has to come from somewhere. If it comes from the IRA itself, you've shrunk the asset you were trying to optimize."

Roth conversions are often marketed as a simple retirement move, but the immediate tax cost can be substantial. When a conversion is taxed, the tax bill arrives months later and can be remembered more than the promised tax-free growth. Federal brackets are marginal, so only part of income is taxed at the highest rate, but Roth conversions stack on top of existing income and can cause the converted amount to be taxed at the full top bracket rate. A retired couple converting $50,000 to fill the 24% bracket can face an estimated $12,000 tax bill. The money to pay that bill must come from somewhere, potentially reducing the IRA assets being optimized or increasing taxable income elsewhere.

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