The Schedule 1 tax form is the attachment you file with your Form 1040 when you have income the main return doesn’t have a line for, or when you qualify for certain deductions that come off your income before the standard deduction ever applies. Part I reports additional income: freelance earnings, unemployment, rental income, gambling winnings, taxable state refunds, and more. Part II claims above-the-line adjustments like student loan interest, HSA contributions, and the deductible half of self-employment tax. The totals flow back to your 1040 and shape your adjusted gross income, which drives your tax bracket and your eligibility for a long list of credits.
Who Has to File Schedule 1
You need Schedule 1 anytime your return involves income or deductions that don’t fit on the base Form 1040. If your only income is W-2 wages and you’re taking the standard deduction with nothing else going on, you can skip it.
The triggers are broader than most filers expect. You’ll need Schedule 1 if you:
- Earned any self-employment or freelance income
- Received unemployment benefits
- Had rental property or income from a partnership, S corporation, estate, or trust
- Won money gambling or received prizes
- Contributed to a Health Savings Account
- Paid student loan interest
- Are a K-12 educator claiming classroom expenses
- Pay or receive alimony under a pre-2019 divorce agreement
- Got a taxable state or local tax refund
Any single one of these puts the form on your return. The form itself runs two pages, and each line that applies to you needs an entry before the two totals feed back into your 1040.
Part I: Additional Income
Part I collects income streams the main return doesn’t accommodate. Every payer who sent you a tax form also sent one to the IRS, so skipping income the agency already knows about is one of the fastest ways to draw a notice.
Business and Self-Employment Income
Net profit or loss from a sole proprietorship goes on Line 3, pulled from Schedule C. Freelancers, gig workers, rideshare drivers, and online sellers report what they earned after expenses here.1Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) Farm income or loss uses Line 6 and flows from Schedule F.
Rental, Royalty, and Pass-Through Income
Line 5 covers rental real estate, royalties, and your share of earnings from partnerships, S corporations, estates, or trusts. The detail comes from Schedule E, which breaks down each property or entity separately.2Internal Revenue Service. Schedule 1 (Form 1040) 2025 – Additional Income and Adjustments to Income
Unemployment Compensation
Unemployment benefits are taxable at the federal level. The state agency that paid you sends Form 1099-G with the total, which you report on Line 7.3Internal Revenue Service. Form 1099-G – Certain Government Payments Any tax withheld from those payments appears on the same 1099-G and gets claimed on your 1040.
State and Local Tax Refunds
A state or local income tax refund can be taxable, but only if you itemized last year and got a tax benefit from deducting those taxes. If you took the standard deduction last year, the refund isn’t taxable and doesn’t get reported. When it is taxable, it goes on Line 1.
Alimony Received
Alimony received under a divorce or separation agreement executed before 2019 is taxable income and goes on Line 2a. Agreements finalized in 2019 or later follow different rules, and the recipient doesn’t report the payments at all.4Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance The date of the original agreement controls, even if it was later modified.
Gambling, Prizes, Jury Duty, and Other Income
Line 8 is a catchall with more than 20 subcategories. The ones most filers hit are gambling winnings (8b), prizes and awards (8i), jury duty pay (8h), and cancelled debt (8c). Scholarship or fellowship income not already on a W-2 goes on 8r, and digital assets received as ordinary income that aren’t captured elsewhere go on 8v.2Internal Revenue Service. Schedule 1 (Form 1040) 2025 – Additional Income and Adjustments to Income
Gambling winnings are reportable whether or not the casino or lottery issued a W-2G. The form only gets sent above certain thresholds, but the income itself is always taxable. Prizes and non-cash awards work the same way: win a car on a game show, report its fair market value on 8i.
Part II: Adjustments to Income
Part II is where the form works in your favor. These above-the-line deductions reduce your AGI whether you itemize or take the standard deduction, and a lower AGI can also open up credits and deductions that phase out at higher incomes.
Educator Expenses
Eligible K-12 teachers, counselors, and principals who spend their own money on classroom supplies can deduct up to $300 per person on Line 11. If both spouses are educators filing jointly, each can claim up to $300, for a combined maximum of $600. Qualifying purchases include books, supplies, computer equipment, and professional development courses.5Internal Revenue Service. Topic No. 458, Educator Expense Deduction
HSA Contributions
Contributions to a Health Savings Account are deductible on Line 13 if you have a qualifying high-deductible health plan. For 2026, the annual limit is $4,400 for self-only coverage and $8,750 for family coverage.6Internal Revenue Service. Rev. Proc. 2025-19 The deduction is available even if you don’t itemize, and you report it through Form 8889, which attaches to your return.7Internal Revenue Service. Publication 969 – Health Savings Accounts and Other Tax-Favored Health Plans
Self-Employment Deductions
Self-employed filers get three dedicated lines in Part II. Line 15 is the deductible half of self-employment tax, mirroring the employer share that W-2 workers never see. Line 16 covers retirement plan contributions, including SEP IRAs (up to the lesser of 25% of compensation or $72,000 for 2026) and SIMPLE IRAs.8Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs) Line 17 handles self-employed health insurance premiums for you, your spouse, dependents, and children under 27. Line 17 is off-limits for any month you were eligible to participate in an employer-sponsored plan.9Internal Revenue Service. Self-Employed Health Insurance Deduction
The retirement plan deduction is reported here on Schedule 1 rather than on Schedule C, which trips up first-time filers who assume every business-related deduction lives with the business income.10Internal Revenue Service. Self-Employed Individuals: Calculating Your Own Retirement Plan Contribution and Deduction
Military Moving Expenses
Since 2018, the moving expense deduction has been available only to active-duty members of the Armed Forces relocating under military orders for a permanent change of station. It goes on Line 14 and is calculated on Form 3903.11Internal Revenue Service. Topic No. 455, Moving Expenses for Members of the Armed Forces and the Intelligence Community If your military reimbursement falls short of your actual costs, the difference is deductible.12Internal Revenue Service. Instructions for Form 3903 Moving Expenses Civilians relocating for a new job cannot use this deduction.
IRA Contributions
Traditional IRA contributions are deductible on Line 20, up to $7,500 for 2026. How much you can deduct depends on your income and whether you or your spouse are covered by a workplace retirement plan. For single filers with an employer plan, the deduction phases out between $81,000 and $91,000 of modified AGI. For joint filers where the contributing spouse has a workplace plan, the phaseout runs from $129,000 to $149,000.13Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 With no workplace plan on either side, there’s no income limit on the deduction.
Student Loan Interest
You can deduct up to $2,500 in student loan interest on Line 21. The deduction applies to all qualifying education loans, not just federal ones, and is available whether or not you itemize. Your lender will send Form 1098-E showing the interest you paid.14Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction The deduction phases out at higher income levels.
Alimony Paid
If you pay alimony under a divorce or separation agreement executed before 2019, you can deduct those payments on Line 19a. You’ll list the recipient’s Social Security number on Line 19b and the date of the original agreement. Agreements from 2019 forward don’t allow the deduction.4Internal Revenue Service. Topic No. 452, Alimony and Separate Maintenance
How Schedule 1 Flows Into Your 1040
Once every applicable line is filled in, you total Part I on Line 10 and total Part II on Line 26. Line 10 transfers to Line 8 of your Form 1040, and Line 26 transfers to Line 10 of the 1040.2Internal Revenue Service. Schedule 1 (Form 1040) 2025 – Additional Income and Adjustments to Income Your 1040 then subtracts the adjustments from total income to produce your adjusted gross income.
AGI is the number that drives the rest of your return. It determines whether you qualify for education credits, how much of your Social Security is taxable, whether you can deduct medical expenses, and how large your child tax credit is. Getting Schedule 1 right ripples through every calculation that follows.
Filing It With Your Return
Tax software builds Schedule 1 as you enter income and deductions, and attaches it to your 1040 automatically during electronic filing. Paper filers need to place Schedule 1 in the correct order behind the 1040, along with any supporting schedules it references: Schedule C for business income, Schedule E for rentals, Form 8889 for HSA contributions, Form 3903 for military moves, and so on. Missing a supporting schedule is one of the most common reasons the IRS sends follow-up correspondence.
What Happens If You Leave Income Off
Omitting income from Schedule 1 doesn’t hide it. The IRS receives copies of every 1099-G, 1099-MISC, W-2G, and K-1 sent to you, and its automated matching system flags discrepancies. When unreported income surfaces, two layers of consequences apply.
First, if the return is filed late, the failure-to-file penalty runs 5% of your unpaid tax for each month the return is overdue, up to 25%.15Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax For returns more than 60 days late, the minimum penalty is the lesser of $525 (for returns due in 2026) or 100% of the tax owed.16Internal Revenue Service. Collection Procedural Questions
Second, if you understate income through negligence or a substantial understatement of tax, the IRS can add an accuracy-related penalty of 20% on top of the underpayment.17Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments A substantial understatement generally means underreporting your tax by the greater of 10% of the correct tax or $5,000. Between back taxes, interest, and penalties, a small omission can grow into a much larger bill.