Schedule 1-A, Explained

Schedule 1-A (Form 1040), officially titled "Additional Deductions", is a brand new IRS form created by the One Big Beautiful Bill Act, signed on July 4, 2025. If you have seen the search term written as schedule 1a or schedule 1 a, it is the same form: the IRS name is Schedule 1-A. It exists for one reason, to calculate four temporary deductions that did not fit anywhere on the existing forms, and it applies to tax years 2025 through 2028 only.

Two features make schedule 1-a unusual. First, the deductions sit below the line: they reduce your taxable income after your adjusted gross income is set, so they do not change AGI based credits and limits. Second, they are available to everyone: you claim them whether you take the standard deduction or itemize. That is different from a deduction like SALT, which lives on Schedule A and only helps itemizers, a contrast our SALT Deduction Calculator explains in detail.

People asking what is federal schedule 1 are usually looking at the older form, and the similar names cause real confusion. Schedule 1, "Additional Income and Adjustments to Income", is permanent: it reports extra income like business and rental income, and adjustments like student loan interest and educator expenses, and it changes your AGI. Schedule 1-A is temporary (2025 to 2028), covers only the four new deductions, does not touch AGI, and sends its total to line 13b of Form 1040 instead. Plenty of returns will carry both forms at once; they are not versions of each other.

The form has six parts. You complete schedule 1 part 1 and the total, plus only the deduction parts that apply to you:

Part I comes first for a reason: every deduction on the form is tested against the same MAGI figure, your AGI with certain foreign income added back. Part II handles tips reported on your W-2 and Forms 4137 or 1099, limited to occupations the Treasury lists as traditionally tipped, and reduced by $100 for each $1,000 of MAGI over the threshold. Part III is the overtime deduction, worked out with our No Tax on Overtime Calculator, with the same $100 per $1,000 reduction. Part IV covers interest on loans for new vehicles assembled in the United States, reduced by $200 per $1,000 over its lower threshold. Part V gives filers who are 65 or older an extra $6,000 each, reduced by 6% of MAGI over $75,000 ($150,000 joint). Part VI simply adds the four results together.

From tax year 2026, your W-2 feeds this form directly. Qualified overtime compensation is reported in Box 12 with code TT. Qualified tips appear in Box 12 with code TP, and your Treasury Tipped Occupation Code is shown in the new Box 14b. If a code TT amount is understated compared with your pay stubs, the fix is a corrected W-2c from your employer: the reported amount acts as a ceiling for the overtime part. For 2025 returns, when this reporting was optional, keep your final pay stub and any employer statement of tips and overtime premium, because those documents are your evidence.

1. Check the four deductions against your year. Tips, FLSA overtime, a new US-assembled car loan from 2025, or a 65th birthday: if none apply, you do not need the form.
2. Collect your source numbers. W-2 Box 12 codes TT and TP, Box 14b, your lender's statement of car loan interest, and your dates of birth for the senior part.
3. Complete Part I to fix your MAGI, because every phase-out reads from it.
4. Complete only your parts (II to V), applying each cap and phase-out.
5. Total in Part VI and copy the result to line 13b of Form 1040.
6. Attach the schedule to your return. Tax software handles the attachment automatically when you enter the deductions.

A small worked example ties it together. A server files single in 2026 with $9,000 of qualified tips and $3,000 of overtime premium, and MAGI of $48,000. Part II gives $9,000, Part III gives $3,000, Parts IV and V are empty, and Part VI sends $12,000 to line 13b. At the 12% bracket that is roughly $1,440 of federal tax saved, on top of the standard deduction. If the same worker first wants the overtime piece checked, our overtime pay calculator splits the underlying hours and pay.

• Filing Schedule 1 when you meant 1-A. The deductions do not exist on Schedule 1; a claim entered there is simply lost.
• Deducting all overtime pay. Only the premium portion belongs in Part III, never the full overtime wage.
• Claiming tips and overtime while filing separately. Married taxpayers must file jointly for Parts II and III.
• Forgetting the phase-outs. Each part has its own threshold; the car loan part starts reducing at just $100,000 of MAGI.
• Skipping the form because you take the standard deduction. These deductions were designed to stack on top of it.
• Using it after 2028. Under current law the form's deductions end with tax year 2028.

Form structure and figures verified against the IRS Schedule 1-A and summaries from tax publishers, October 2026. General information only, not tax advice.