Filing Taxes After a Spouse Dies: One Last Joint Return.

A woman in her early seventies loses her husband in March. The survivor pension keeps paying, the IRA distributions keep coming, and her income next year looks like this year's. The federal tax on it nearly doubles. Filing taxes after a spouse dies runs on filing status, and hers is about to move from the best one to the worst.

The year of death is a married year. IRC §6013(a)(3) makes that joint return the executor's to file, with an exception that covers most families: the surviving spouse files it if no return has been made for the decedent and no executor or administrator is appointed before the survivor's own filing deadline. An executor appointed later can disaffirm it under Treas. Reg. §1.6013-1(d)(5) by filing a separate return within 1 year of that deadline.

The return reports all of your income for the full year plus your spouse's income through the date of death. What he had earned but not received by then is income in respect of a decedent under §691, taxed to whoever receives it: a final paycheck, accrued interest, a requested but unpaid IRA distribution. Section 1014(c) denies it a basis step-up.

On a paper return, write "Deceased," your spouse's name, and the date of death across the top, and sign in the signature area as filing as surviving spouse. You do not need Form 1310 for the refund on a joint return. The final Form 1040 is due April 15, 2027 for a death in 2026, and Publication 559 walks through the rest.

For 2026 a joint return gets a $32,200 standard deduction plus $1,650 for each spouse age 65 or older. A single filer gets $16,100 plus $2,050 at 65 or older. Same income, roughly half the deduction. The brackets compress at the same time: under the 2026 inflation adjustments, 22% starts at $100,800 of taxable income on a joint return and at $50,400 for a single filer.

Two more years of joint rates are available only under IRC §2(a): your spouse died during one of the two preceding tax years, you have not remarried, and your home is the principal place of abode of your dependent son, stepson, daughter, or stepdaughter, with you paying over half the cost of the household. That is qualifying surviving spouse status, and a widow with grown children does not qualify. A dependent parent can instead make you head of household.

The $6,000 senior deduction under §151(d)(5)(C), claimed on Schedule 1-A for 2025 through 2028, gets hit twice. It runs per person age 65 or older, so two qualifying spouses claim $12,000 and a survivor claims one $6,000. And the phase-out threshold halves: the deduction shrinks by 6 cents per dollar of modified AGI over $150,000 jointly, over $75,000 single.

Medicare is the second bill. The 2026 IRMAA surcharge starts above $109,000 of modified AGI for a single filer and $218,000 for a joint return, and it reads the return from two years back, so today's income sets premiums two years out. At $132,000 the widow is $23,000 over the single threshold where the couple was $86,000 under the joint one. The first tier adds $81.20 a month to the $202.90 standard Part B premium plus $14.50 for Part D, about $1,148 a year. Form SSA-44 treats the death of a spouse as a life-changing event, but it only works if income actually fell, and losing the joint brackets is not an income drop.

Your spouse's tax attributes die with him. Under Rev. Rul. 74-175, a capital loss carryover and a net operating loss belong to the taxpayer who sustained them, deductible on the final return and nowhere else: not on your later returns, not on the estate's. If he carried a $40,000 capital loss forward, the year of death is the last year anything can absorb it. Selling appreciated stock in December to use it is worth $6,000 at the 15% rate, and $0 in January.

Under §213(c), a last hospital bill the estate pays within 1 year after death counts as paid when the services were rendered, so it belongs on the final Form 1040. And §121(b)(4) keeps the $500,000 home sale exclusion for a sale within 2 years of the date of death if you have not remarried, after which it is the $250,000 in capital gains tax when selling a house.

A surviving spouse is the only beneficiary who can treat an inherited IRA as her own, by rolling it over or redesignating the account. Do that if you are past 59 1/2: your own IRA carries no beneficiary distribution schedule and you name new beneficiaries. Under 59 1/2 and likely to need the money, leaving it as an inherited IRA avoids the 10% early distribution penalty. Either way, if he had reached his required beginning date and had not taken that year's distribution, the beneficiary still has to, and missing it costs 25% under §4974.

An estate with $600 or more of gross income files Form 1041 under §6012(a)(3), and porting his unused exemption on Form 706 has its own deadline and its own late relief. Then fix the withholding before the single-rate year starts: a new Form W-4P with the pension payer, Form W-4V for Social Security, or estimates. Joint-bracket withholding against single-rate income is how a survivor gets a balance due and a penalty in one envelope.