The federal tax tables are built for households, and they do not shrink when a household does.
For 2026, the 12% bracket ends at $100,800 of taxable income on a joint return and at $50,400 on a single return. The standard deduction splits the same way: $32,200 for joint filers, $16,100 for single filers.
Income, meanwhile, often stays put. Interest, rental income and withdrawals from a retirement account the survivor inherits may not drop at all. The brackets halve once the survivor files as single.
What the same income costs after a death
Take $100,000 of ordinary income and the standard deduction, nothing else. On a joint return, taxable income is $67,800 and the 2026 tax comes to $7,640.
On a single return, taxable income is $83,900 and the tax is $13,170. That is $5,530 more on identical income, because $33,500 of it lands in the 22% bracket instead of the 12% one. The example ignores Social Security taxation, the extra deduction for age 65 and older, and credits, so real bills will differ.
The timing has a wrinkle. When a spouse dies, the survivor is “considered married for the whole year for filing status purposes,” and can file a joint return for that year if no remarriage f...