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IRSIndividual Income Tax (1040 Series)

Official form guide

Form 1040S1: 1040 (Schedule 1)

Form 1040 Schedule 1 reports additional income and adjustments to income that do not fit on the main 1040. Use it when you have things like unemployment compensation, alimony received, educator expenses, or student loan interest.

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Form Overview

IRS Form 1040S1 - 1040 (Schedule 1)

Form 1040 Schedule 1 reports additional income and adjustments to income that do not fit on the main 1040. Use it when you have things like unemployment compensation, alimony received, educator expenses, or student loan interest.

It captures extra income (e.g., unemployment, prize winnings) and adjustments (e.g., educator expenses, IRA contributions, student loan interest).

Risk Radar

Scan points
  • 1Missing Schedule 1 can trigger a notice and delay your refund.
  • 2Omitting a required income line
  • 3Double‑counting an adjustment already claimed on 1040
  • 4Transferring totals to the wrong line on the 1040
  • 5Using an outdated Schedule 1 version

Plain English

Think of Schedule 1 as the extra page you attach to your tax return when you earned money or got deductions that the basic 1040 doesn’t ask about. It adds those amounts to calculate your total taxable income and your adjusted gross income.

Submission Date

  • Filing date: 2026-01-02 11:10:41
  • Preparation window: collect IDs, supporting records, and signatures in advance.
  • Final review: verify names, dates, and required fields before submission.

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Glossary Terms

interestincomemoneygross

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What this form is for

  • Use when you have any of the listed additional income or adjustments.
  • Do not use if none of the Schedule 1 items apply; the 1040 alone suffices.
  • Check Schedule 2 if you also have other taxes (e.g., alternative minimum tax).

Form selector

Use this form or another form?

Self‑employment income > $400

Business profit flows to Schedule 1 line 3

✓ Verify before attaching

Schedule C

Capital gains not reported on 1040 line 7

Gains flow to Schedule 1 line 4

✓ Ensure Schedule D attached

Schedule D

Health savings account deduction

HSA deduction appears on Schedule 1 line 12

✓ Confirm HSA contributions

Form 8889

Deadline or filing window

Schedule 1 follows the same filing deadline as Form 1040—generally April 15, unless you file an extension. If you file after the deadline, penalties may apply to the entire return, not just the schedule.

  • —Student loan interest paid | Sum of qualified interest | Deduction amount | Limit $2,500

Checklist

What you need before filling it out

1

Unemployment compensation

Form 1099‑G · Received from state unemployment agency

⚠ Often omitted if amount is small✕ Medium
2

Educator expenses

Receipts for classroom supplies · School purchase records

⚠ Mis‑calculated maximum $300✕ Low
3

IRA contribution

Form 5498 or bank statement · Year‑end contribution report

⚠ Forgetting to report nondeductible portion✕ High
4

Alimony received (pre‑2019)

Divorce decree or payment statements · Legal documents

⚠ Confused by post‑2018 rules✕ Medium

Before you submit

  1. 1All required income lines on Part I are filled
  2. 2All applicable adjustment lines on Part II are filled
  3. 3Totals correctly transferred to Form 1040 lines 8 and 10
  4. 4Signature and date on Form 1040 (Schedule 1 has no signature line)
  5. 5Form version matches tax year
  6. 6Schedule attached in the correct order (after Form 1040, before other schedules)
  7. 7Electronic submission includes Schedule 1 PDF
  8. 8If mailing, use a secure envelope and include a copy of the 1040 cover page

How to file this form

  1. 1Collect all 1099‑G, 5498, and receipt documents
  2. 2Enter amounts in Part I, then Part II of Schedule 1
  3. 3Add the Part I total to Form 1040 line 8 and Part II total to line 10
  4. 4Run a math check or let software verify totals
  5. 5Attach Schedule 1 to the front of the 1040 packet
  6. 6Sign the 1040 and mail or e‑file
  7. 7Retain copies of supporting documents for at least three years

Known limitations

  1. 1Schedule 1 does not calculate tax; it only feeds numbers to Form 1040
  2. 2The form does not include instructions for each line; refer to the 1040 instructions
  3. 3Limits on certain deductions (e.g., student loan interest) are not enforced on the schedule itself
  4. 4No separate filing fee; any penalty is tied to the overall return

Field map

Compact field-by-field guide

10 fields

Personal Info

3 items

Full Legal Name

Enter your legal first and last name as shown on your Social Security card.

Requiredtext
Social Security Number

Your SSN must match IRS records exactly.

Requiredssn
Home Address

Current mailing address including street, city, state, and ZIP code.

Requiredtext

Filing Status

1 items

Filing Status

Select: Single, Married Filing Jointly, Married Filing Separately, Head of Household, or Qualifying Surviving Spouse.

Requiredselect

Income

1 items

Total Income

Sum of all income sources — wages, interest, dividends, business income, capital gains, unemployment, retirement, and other income.

Requiredamount

Adjustments

1 items

Adjusted Gross Income (AGI)

Total income minus above-the-line deductions such as IRA contributions, student loan interest, and HSA contributions.

Requiredamount

Deductions

1 items

Standard or Itemized Deduction

Choose the higher of the standard deduction for your filing status or total itemized deductions from Schedule A.

Requiredamount

Tax

1 items

Taxable Income

AGI minus deductions. This determines your tax bracket and the amount of tax owed.

Requiredamount

Payments

1 items

Total Payments and Credits

Sum of federal tax withheld, estimated tax payments, and refundable credits like the Child Tax Credit.

amount

Signatures

1 items

Signature

You must sign and date the return. Unsigned returns are invalid.

Requiredsignature
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Current form status
IRS

The 2023 edition of Schedule 1 is in effect for tax year 2023 returns filed in 2024. Verify the edition date on the top of the form before use.

What changed or needs a fresh check

  • Edition date: verify the form shows 2023
  • Fee: no filing fee for Schedule 1 itself
  • Mailing address: use the address for Form 1040 in the instructions
  • Electronic filing: supported by most tax‑software
  • Paper size: US Letter, double‑sided optional

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Form 1040S1 page 1

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Form 1040S1 page 2

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Quick Facts

Anyone filing a Form 1040 who has reportable items listed on Schedule 1 must attach it.
It captures extra income (e.g., unemployment, prize winnings) and adjustments (e.g., educator expenses, IRA contributions, student loan interest).
Attach Schedule 1 to your Form 1040 when you file your annual individual income tax return, typically by April 15 of the following year.
Mail the completed Schedule 1 with the rest of your Form 1040 to the IRS address listed in the 1040 instructions, or submit electronically through approved tax‑software.
Errors on Schedule 1 change your adjusted gross income, which can affect tax liability, credits, and eligibility for other programs.
Gather all documents for extra income and adjustments. Fill out Part I (Additional Income) then Part II (Adjustments to Income). Transfer the totals to the appropriate lines on Form 1040. Review totals for arithmetic errors before signing and filing.

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After you file

  1. 1Keep a copy of the filed Schedule 1 with your tax records
  2. 2Monitor IRS account for acknowledgment of receipt
  3. 3If you receive a notice, verify the line numbers referenced
  4. 4Adjust future withholding if Schedule 1 changed your AGI significantly
  5. 5Store supporting documents (e.g., 1099‑G) for at least three years
  6. 6Update tax‑software profile with any new income sources

Sources

  • SRCIRS Form 1040 Schedule 1 instructionsconfirms purpose and line mapping
  • SRCIRS Publication 525details taxable unemployment compensation
  • SRCIRS Publication 970educator expense limits
  • SRCIRS Publication 590‑AIRA contribution deduction rules
  • SRCIRS Publication 970student loan interest deduction cap
  • SRCIRS Form 1040 filing deadlineApril 15, unless extension filed
  • SRCIRS e‑file guidelinessupports electronic submission of Schedule 1

Common confusion points

Unemployment compensation vs. unemployment benefits

Some taxpayers think it’s non‑taxable

→ Verify with Form 1099‑G

Alimony received after 2018

Post‑2018 alimony is not deductible nor taxable

→ Confirm divorce agreement date

Educator expense limit

$300 per person, $600 if married filing jointly and both spouses are educators

→ Check spouse’s eligibility

IRA contribution deduction vs. nondeductible basis

Nondeductible part must be reported on Form 8606

→ Ensure Form 8606 attached if needed

Student loan interest cap

Max $2,500 deduction

→ Sum all qualified interest before applying cap

Workflow map

Related forms and next steps

6 signals

Before

Form 1040 – main individual income tax return

Current

1040S1

After

Form 1040 line 8 (Other income) receives Schedule 1 totalForm 1040 line 10 (Adjusted gross income) receives Schedule 1 adjustments

Often used with

Schedule 2 – additional taxesSchedule 3 – non‑refundable credits

⚠ If something goes wrong

  • IRS Notice 21‑XX – missing schedule or incorrect totals

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Copyright & Licensing - US Government Forms

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Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
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