1. What Is Schedule 1-A (Form 1040)? The OBBBA Tax Changes Behind It

Schedule 1-A (Form 1040), “Additional Deductions,” is a new schedule the IRS created for the 2025 tax year — the returns most people file during the 2026 filing season. It’s the one place where you calculate and claim four deductions created by the One Big Beautiful Bill Act (OBBBA), which became law on July 4, 2025. You attach Schedule 1-A to your Form 1040, 1040-SR, or 1040-NR whenever at least one of the four applies. For the wider picture of what else the law changed, see OBBBA tax changes 2026: every new deduction explained.

Despite the “four deductions” framing, the form itself has six parts. Part I is where you enter your modified adjusted gross income (MAGI), which drives each deduction’s income phase-out. Parts II–V hold the four deductions themselves — tips, overtime, car-loan interest, and the senior amount. Part VI adds them up on line 38, and that total carries to Form 1040 (or 1040-SR) line 13b — line 13c on Form 1040-NR. Because it lands there, it’s an above-the-line adjustment: you get it whether you take the standard deduction or itemize.

• 4deductions
• 6parts on the form
• Line 13bwhere the total lands
• 2025–2028years it applies

Working out your MAGI (Part I) is simpler than it looks. Line 1 is just your AGI, copied from Form 1040, line 11b. Lines 2a–2d add back a short list of excluded items — excluded Puerto Rico income, and amounts from Form 2555 (foreign earned income exclusion) and Form 4563 (income excluded by bona fide residents of American Samoa) — which are summed on line 2e. Line 3 (AGI plus line 2e) is your MAGI for every phase-out on this schedule. If you don’t have foreign or Puerto Rico income, your MAGI simply equals your AGI — most filers can skip straight to checking that number against the thresholds below.

One quirk worth knowing: there is no separate Schedule 1-A instruction booklet. The line-by-line instructions live inside the general Form 1040 instructions. If a figure or line reference below matters to your return, that booklet is the authority. For the IRS’s own plain-language overview, see the agency’s page on Schedule 1-A, Additional Deductions.

2. Which of the Four Deductions Is Yours?

The “Which Deduction Is Yours?” table at the top of this page is the fastest way to find your break — scan the “You qualify if…” column, check the cap, note the one trap, and open the full guide. Here’s the short version of each, so you know which spoke article to read next. Not everyone will qualify for any of these, and that’s fine; the point is to see clearly whether one fits.

Below are the caps and income limits side by side. The phase-outs don’t erase the deduction at the threshold — above it, the deduction is reduced gradually (roughly $100 per $1,000 of MAGI over the line for tips and overtime, $200 per $1,000 for the car-loan deduction, and about $60 per $1,000 for the senior deduction), until it reaches zero.

3. No Tax on Tips — Part II of Schedule 1-A

Despite the “no tax” nickname, this is a deduction of up to $25,000 in qualified tips — not a blanket exemption. To qualify, you must work in an occupation that customarily and regularly received tips (the IRS published a list of roughly 68), and the tips must be voluntary and customer-determined; mandatory service charges don’t count. The deduction begins to phase out once MAGI passes $150,000 single / $300,000 joint, and you still owe Social Security and Medicare tax on those tips. For the step-by-step, read No Tax on Tips 2026: how to claim the deduction.

4. No Tax on Overtime — Part III of Schedule 1-A

Is overtime tax-free in 2026? Not entirely.

Here’s the myth-bust up front: only the premium “half” of time-and-a-half qualifies — the extra pay above your regular rate that the Fair Labor Standards Act requires — not your full overtime paycheck. The deduction is capped at $12,500 ($25,000 for joint filers, combined across both spouses) and is limited to FLSA non-exempt W-2 workers; salaried exempt employees and independent contractors generally don’t qualify. It phases out above $150,000 / $300,000 MAGI, and payroll taxes still apply to all your overtime. The mechanics are covered in No Tax on Tips and Overtime: how the deduction works.

Government and public-safety workers: the deduction follows FLSA status, not employer type. Most federal, state, and local government employees who are FLSA non-exempt qualify — federal workers can check block 35 of their Standard Form 50 (“N” generally means non-exempt). Police officers and firefighters are typically non-exempt too, but many work under FLSA’s Section 207(k) alternative work-period rules, so their premium hours are calculated against a different threshold than the standard 40-hour week — ask your payroll office which hours actually generated FLSA-required overtime before assuming your whole overtime check qualifies.

5. Car Loan Interest — Part IV of Schedule 1-A

The trap up front: this only works for a new vehicle whose final assembly was in the United States and whose original use begins with you — used and leased vehicles don’t qualify, and neither do RVs or campers. If you meet those rules, you can deduct up to $10,000 of interest per year on the loan (the loan must have originated after December 31, 2024), phasing out above $100,000 / $200,000 MAGI. You must report the vehicle’s VIN on your return; the quickest way to confirm U.S. assembly is the NHTSA VIN Decoder, the tool the IRS itself points to. The full eligibility walkthrough is in Car Loan Interest Deduction: do you qualify in 2026?

Your lender documents the interest on Form 1098-VLI, “Vehicle Loan Interest Statement.” For 2025 interest, the IRS gave lenders transition relief (Notice 2025-57): they only had to make the total interest available to you by January 31, 2026, on the actual form or on a substitute statement. Starting with 2026 interest, lenders must issue the real Form 1098-VLI. Either way, wait for that statement (or your own loan records if you paid under the $600 reporting threshold) rather than estimating the interest yourself.

6. The Federal Tax Deduction for Seniors 2026: $6,000 — Part V of Schedule 1-A

The reassurance up front: this deduction does not reduce your Social Security benefit — it’s an income-tax deduction that simply lowers your taxable income. If you’re 65 or older by the last day of the tax year, you can claim an extra $6,000 ($12,000 for a couple where both spouses qualify), on top of the regular standard deduction and the existing additional standard deduction for seniors. It phases out above $75,000 single / $150,000 joint. For who qualifies and how it stacks, see New $6,000 Senior Tax Deduction: who qualifies? and the IRS page on the enhanced deduction for seniors.

7. The Rules That Apply to All Four (Don’t Get These Wrong)

This is where the hub earns its keep — the shared mechanics no single deduction guide assembles in one place.

• You do not have to itemize. All four are above-the-line adjustments on Schedule 1-A, so standard-deduction filers get them too.
• The tips cap doesn’t double for couples. Unlike overtime, the $25,000 tips cap is per return — if both spouses work tipped jobs, their combined qualified tips are still capped at $25,000, not $50,000.
• Married couples generally must file jointly. For the tips, overtime, and senior deductions, married filing separately is disqualified. The car-loan-interest deduction is the exception — separate filers may each claim up to $10,000.
• A valid Social Security number is required for the qualifying person on the return.
• They’re temporary. All four currently apply for tax years 2025 through 2028 and are scheduled to expire after 2028 unless Congress extends them — don’t plan as if they’re permanent.
• Your state may still tax this income. These are federal deductions; states set their own rules, and some don’t automatically conform to them. California, New York, and Illinois are among the larger states that don’t conform, meaning your tips, overtime, or other income here can still be taxable on your state return even though it’s deducted federally. Confirm your specific state’s treatment before assuming it matches your federal savings.
• Guidance is still settling. The IRS was issuing rules on tips and overtime as the season opened, so confirm the current instructions and make sure your tax software is up to date.

8. How to File Schedule 1-A: Form 1040 Instructions

At the consumer level, the flow is straightforward: complete Part I (your MAGI) and only the parts — II through V — that apply to you, total them in Part VI on line 38, and carry that figure to Form 1040 or 1040-SR, line 13b. The line-by-line details are in the Form 1040 instructions, since Schedule 1-A has no separate booklet.

Gather your records first: pay stubs and any tip logs (for tips and the overtime premium), your W-2s and 1099s, your loan statements and the VIN (for the car-loan deduction), and your birthdate (for the senior deduction). Major tax software supports the new schedule, and IRS Free File remains available to taxpayers with 2025 AGI of $89,000 or less. Note that the IRS Direct File program was discontinued and isn’t offered for the 2026 season.

9. Frequently Asked Questions

What is Schedule 1-A (Form 1040)?

It’s a new 2025 IRS schedule titled “Additional Deductions.” It gathers four OBBBA deductions — tips, overtime, car-loan interest, and the senior bonus — in Parts II–V, totals them in Part VI, and sends the result to Form 1040/1040-SR line 13b. You attach it whenever at least one deduction applies.

Do I have to itemize to claim these deductions?

No. All four are above-the-line adjustments, so you can claim them whether you take the standard deduction or itemize.

Is all of my overtime pay tax-free?

No. Only the premium “half” of time-and-a-half qualifies, capped at $12,500 ($25,000 joint). Your regular pay for those hours stays taxable, and Social Security and Medicare taxes apply to all of it.

Is all of my tip income tax-free?

No. It’s a deduction of up to $25,000 of qualified, voluntary, customer-determined tips, only for workers in customarily-tipped occupations, and it phases out at higher incomes. Mandatory service charges don’t count, and payroll taxes still apply.

Does a used car qualify for the loan-interest deduction?

No. Only a new vehicle whose original use begins with you and whose final assembly was in the U.S. qualifies. Used and leased vehicles are excluded; confirm assembly using the VIN.

Does the senior deduction reduce my Social Security benefits?

No. It’s an income-tax deduction that lowers your taxable income; it does not change your monthly benefit or reduce your check.

Are these deductions retroactive to 2025?

Yes. All four apply to the full 2025 tax year even though the law passed mid-2025, so they appear on the return you file in 2026.

Do they expire?

Yes. They currently run for tax years 2025 through 2028 and are scheduled to expire after 2028 unless Congress extends them.

Can married couples filing separately claim them?

Generally no for tips, overtime, and the senior deduction — married taxpayers must file jointly. The car-loan-interest deduction is the exception: separate filers may each claim up to $10,000.

What’s the difference between Schedule 1-A, Schedule 1, and Schedule K-1?

Schedule 1-A (Form 1040) is the new “Additional Deductions” form for these four breaks. Schedule 1 (Form 1040) is the long-standing “Additional Income and Adjustments to Income” form (business income, unemployment, student-loan interest, and the like). Schedule K-1 reports your share of income from a partnership, S corporation, estate, or trust. Different forms, different jobs.

Will my state tax this income anyway?

Possibly. These are federal deductions; states set their own rules and some don’t conform, so your tips, overtime, or other income may still be taxable on your state return. Check your state’s guidance.

Do I need special records to claim these for 2025?

Often yes. Because employers weren’t required to separate tips and the overtime premium on 2025 W-2s and 1099s, you may need to reconstruct the amounts from pay stubs, tip logs, loan statements, and your VIN. Keep those with your return.

What should I do if my employer didn’t put Code TT on my W-2?

Contact your employer’s payroll department and ask for a corrected Form W-2c. Don’t file with a figure you know is wrong — the IRS matches the deduction you claim against what your employer reported, and mismatches can trigger a notice. If you’ve already filed, you may need to amend with Form 1040-X once the corrected W-2c arrives.

Can I claim both the senior deduction and the standard deduction?

Yes. The $6,000 (or $12,000 per couple) senior deduction is claimed on top of your regular standard deduction — including the existing additional standard deduction already available to filers 65 and older. It isn’t an either/or choice.

Does a car manufactured in Canada or Mexico qualify for the interest deduction?

No. The law requires the vehicle’s final assembly to have taken place in the United States, regardless of the brand or where the company is headquartered. Check the vehicle’s VIN with the NHTSA VIN Decoder to confirm the assembly location before assuming it qualifies.

Are mandatory service charges on restaurant bills deductible as tips?

No. The IRS treats mandatory service charges as regular wages, not voluntary, customer-determined tips — so they don’t count toward the qualified-tips deduction even if the money is ultimately distributed to staff.

What does W-2 Box 12 Code TT mean?

Code TT is a new W-2 box, starting with tax year 2026, that reports your total qualified overtime compensation — the FLSA premium “half” only, not your full overtime pay. You’ll use that figure directly in Part III of Schedule 1-A. It won’t appear on the 2025 W-2 you’re using for this filing season.

Does the standard deduction already include the $6,000 senior amount?

No. The $6,000 senior deduction (Schedule 1-A, Part V) is separate from, and stacks on top of, both the regular standard deduction and the older “additional standard deduction for age 65+” that’s built into Form 1040. You can claim all of them together if you’re eligible.