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Roth Conversions in 2026: When the Upfront Tax Hit May Not Pay Off
Moving money from a traditional IRA into a Roth IRA remains one of the more discussed retirement tax strategies, but the decision has grown more nuanced. A conversion shifts pretax (or nondeductible) funds into an account that then grows tax-free, which can reduce the overall tax bill across a lifetime and give heirs more flexibility. The immediate cost is higher taxable income in the year of the conversion, which can raise the current tax bill and trigger other consequences.
Households still hold far more money in traditional IRAs than in Roth accounts. At the end of 2025, traditional IRA assets stood at roughly $15.9 trillion while Roth IRAs held about $2.4 trillion. Conversions have continued to rise; one large recordkeeper reported a 41 percent increase in the first quarter of 2026 compared with the same period a year earlier. For people with large pretax balances who expect to face higher tax rates later—whether from rising brackets, required minimum distributions, or other income—the long-term math can still favor converting at least some of the balance.
The calculation is rarely straightforward, however. Timing of Social Security, projected life expectancy, and plans for leaving money to heirs all change the picture. Even within the same tax bracket, the effective cost of a conversion can be higher than the headline rate suggests, because added income can reduce or eliminate other tax benefits.
Consider a household in the 22 percent bracket with a child in college. The extra income from a conversion might cause the loss of an education tax credit, pushing the true cost of that converted dollar above 30 percent. By contrast, a household in the 10 percent bracket can sometimes convert a limited amount that stays within the standard deduction and creates no additional tax for the current year. In other words, the marginal rate visible on a tax table does not always equal the rate that applies once phaseouts and lost credits are counted.
Recent tax-law changes have added further moving pieces. The higher federal cap on the state and local tax deduction (up to $40,400 for 2026) and the temporary $6,000 senior “bonus” deduction both phase out as income rises. A conversion that pushes adjusted gross income across one of those thresholds can erase part or all of those benefits in the same year. Retirees must also watch Medicare income-related monthly adjustment amounts. Those surcharges, which increase Part B and Part D premiums, are based on modified adjusted gross income from two years earlier, so a conversion completed in 2026 can raise premiums in 2028.
Marketplace health-insurance enrollees face a particularly sharp risk. The premium tax credit that lowers Affordable Care Act plan costs has a hard income cutoff at 400 percent of the federal poverty level—approximately $63,000 for a single person and $129,000 for a family of four in 2026. Crossing that line by even one dollar can eliminate the credit entirely and require the household to repay the full premium amount. Because of that cliff, any conversion while enrolled in marketplace coverage needs careful modeling of the exact income threshold.
The practical takeaway is that a conversion decision should rest on multi-year projections rather than the current year’s tax bracket alone. Factors such as other income sources, available deductions, the timing of required distributions, and non-tax goals all interact. For some households the long-term tax savings and tax-free growth still justify the current-year cost. For others, the combination of higher immediate taxes, lost credits, Medicare surcharges, or ACA subsidy phaseouts makes the trade-off unattractive. Running the numbers across several years, and testing partial conversions rather than an all-or-nothing move, is usually the only way to see which side of the ledger the strategy actually lands on.
