The IRS says the new senior deduction goes on Schedule 1-A, Part V, and carries to line 13b of Form 1040, and that the Social Security number of every qualifying person must be on the return. The rules are in the agency’s Publication 6142, revised in October 2026, and they are filing mechanics, separate from the age and income tests.
Schedule 1-A, Part V, and line 13b
The publication tells taxpayers to complete Form 1040, Schedule 1-A, Additional Deductions, Part V. The result carries forward to line 13b of Form 1040 or Form 1040-SR, or to line 13c of Form 1040-NR for nonresident filers. The amount does not reach the main form unless the schedule is filled in. Nonresident filers use line 13c instead, a detail the publication spells out in the same sentence.
The deduction is $6,000 per qualifying individual, or $12,000 for a qualifying married couple, for tax years 2025 through 2028. The publication says it applies “starting in 2025 and through 2028,” which makes a return for tax year 2026 one of four that can carry it.
Line 13b lowers taxable income, so the deduction works as a subtraction, not as a payment. It is “in addition to the current standard deduction available to seniors under existing law,” the publication says, and it is open to people who itemize as well as people who take the standard deduction.
Taxpayers 65 and older preparing a 2026 return will meet the schedule as a separate step. The age test is firm: the taxpayer must be 65 or older by the last day of the tax year, so someone turning 65 on Dec. 31, 2026 meets it for that year.
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The Social Security number rule
The publication says the return must include the Social Security number of each qualifying individual. That is a filing requirement. It sits in the guidance beside the age test and is not itself a measure of who qualifies, which is how the IRS frames it.
For a couple, the rule means two numbers on one joint return, one for each spouse claiming a $6,000 amount. The publication does not say what happens if a number is missing or mistyped, so the consequence is not described in the guidance, only the requirement.
The rule also separates the senior deduction from the benefit tax rules. Social Security numbers identify the people claiming the deduction. They do not feed the calculation of how much of a benefit is taxable, which a Congressional Research Service report summarized by FEDweek says the deduction leaves unchanged.
Married filers must file jointly
Married taxpayers must file jointly to claim the deduction, according to the publication. A couple that has filed separately in earlier years would give up the senior deduction by filing separately again. The publication states the condition and does not weigh it against other filing choices.
Income thresholds follow the same split. The deduction phases out when modified adjusted gross income exceeds $75,000 for single filers or $150,000 for joint filers, per the publication. CRS puts the reduction rate at 6% and says the thresholds are not adjusted for inflation.
The deduction is not a credit. CRS says it “by itself will not create a tax refund,” and any unused part is lost. Landing the amount on line 13b decides whether the deduction is recorded. It does not decide whether the return ends in a refund, a balance due or neither.
Unused room is lost, in CRS’s words. A filer whose taxable income is $2,500 before the deduction uses $2,500 of it, and the other $3,500 of the $6,000 does nothing. The line 13b entry is the full allowed amount, but the tax effect stops where taxable income reaches zero.
The IRS first pointed taxpayers to the deduction in a Feb. 27, 2026 article on eligibility. The October publication is the document that names the schedule, the part and the line, which makes it the reference for anyone preparing a return by hand or checking a preparer’s work.
Filing mechanics set against the White House description
The mechanics are plainer than a White House release dated Oct. 23, 2026, which says the average senior is expected to pay zero federal taxes on Social Security benefits. The IRS publication makes no such statement. It describes a deduction on a schedule, with a form line, an age test, a joint-return rule and income thresholds.
The IRS’s Working Families Tax Cuts page, updated Oct. 22, points to the agency’s tax tip on new and enhanced deductions for individuals and an article on checking eligibility for the enhanced senior deduction. Neither the page nor the publication says when final 2026 forms will be ready.
What remains open is how the schedule works for couples with one spouse under 65. The publication gives the $6,000 per-person and $12,000 couple amounts but no worked example. Until the IRS publishes one, the line 13b entry for a mixed-age couple is left to the schedule’s instructions.
Where will the senior deduction land on the 2026 return?
A return that omits Schedule 1-A, or leaves off one spouse’s Social Security number, leaves a $6,000 deduction unreported on line 13b. For a couple that is $12,000 of deduction on a single form.
Cut Your Retirement Tax Bill: 12 Moves covers the new $6,000 senior deduction ($12,000 for a couple) for 2025 through 2028 and pairs each of its 12 moves with the form to use, Schedule 1-A and Form 5329 among them. It keeps the 2026 numbers on one page.
Get the guide that names Schedule 1-A and the form for each move →
This article was produced with AI assistance and edited for accuracy against the sources linked above.
