Quick Read
A surviving spouse can convert up to $300,000 to a Roth before December 31 using joint brackets that nearly double the single-filer limit.
The 24% bracket extends to $403,550 on a joint return but only $201,775 for single filers, making the year of death uniquely cheap for large conversions.
Surviving spouses can roll a deceased partner's IRA into their own name, unlocking Roth conversion rights no other beneficiary receives.
If your spouse died this year and you own a traditional IRA or 401(k), one tax move will never be this cheap again. You can still file a joint return for the year of death, and a Roth conversion executed before December 31 gets taxed inside the married-filing-jointly brackets. Next January, the same dollars fall into the single brackets. That is the entire trick, and for many retirees, it is worth six figures. It is also the one piece of planning nobody wants to think about while they are living through it.
Why the Joint Brackets Still Apply This Year
Internal Revenue Code section 6013(a)(3) lets a surviving spouse file a joint return for the year in which the other spouse died. That final joint year uses the wide MFJ brackets and the larger standard deduction. For 2026, the MFJ standard deduction is $32,200, versus $16,100 for a single filer. The 24% band on a joint return runs to $403,550 of taxable income. On a single return, 24% stops at $201,775. Same rate, roughly half the room.
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Widow's Penalty Nobody Warned You About
Your living costs do not halve when your spouse dies. Your tax brackets largely do. The pension, the RMDs, the Social Security, the interest income: most of it keeps arriving. Next year, that income runs through the single tables and the standard deduction shrinks. Every withdrawal for the rest of your life costs more in tax. A conversion this year is the one chance to move a chunk of that future income out of the higher-rate future at today's joint rates (we sized up that narrow window between retirement and RMDs, when conversions are cheapest, in a free Roth guide here). Convert $300,000 in the year of death and much of it fits inside brackets that would be unreachable next January.
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