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Form 1040S3: 1040 (Schedule 3)
IRS Form 1040S3 is an attachment to Form 1040, 1040-SR, or 1040-NR that details additional credits and payments for filers. The form revision date on file is 20/25.
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IRS Form 1040S3 - 1040 (Schedule 3)
IRS Form 1040S3 is an attachment to Form 1040, 1040-SR, or 1040-NR that details additional credits and payments for filers. The form revision date on file is 20/25.
Risk Radar
Scan points- 1Ensure you add all required line totals correctly: Line 20 (Part I) and Line 31 (Part II).
- 2Failing to attach Schedule 3 (Form 1040) with the primary tax return.
- 3Omitting a required credit line from Part I (e.g., Foreign tax credit on Line 1).
- 4Incorrectly summing lines 6a through 6z to calculate Total other nonrefundable credits on Line 7.
- 5Forgetting to transfer the total of Part II onto Form 1040, 1040-SR, or 1040-NR line 31.
Plain English
This form helps detail extra tax breaks (credits) and payments you are claiming when filing your main Form 1040. It allows you to account for things like foreign taxes paid or energy-efficient home improvements before calculating your final tax liability. You attach this schedule directly with your primary tax return.
Submission Date
- Filing date: 2026-01-02 12:10:40
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when attaching additional credits and payments to Form 1040, 1040-SR, or 1040-NR.
- Do not use this form when all credits and payments are listed directly on the primary Form 1040, 1040-SR, or 1040-NR without needing to attach Schedule 3.
- Check Form 8962 instead when detailing the Net premium tax credit.
Form selector
Use this form or another form?
Claiming a Foreign tax credit
This form must be attached if claiming a foreign tax credit in Part I.
✓ Verify attachment of Form 1116.
Claiming an Education credit
The education credits are reported from line 19 of Form 8863 (in Part I).
✓ Ensure the correct amount is transferred to Schedule 3, line 3.
Reporting a Mortgage interest credit
This specific credit requires attaching Form 8396 in Part I.
✓ Confirm that line 6g on Schedule 3 corresponds to this attachment.
Deadline or filing window
The source does not state a specific filing deadline for Schedule 3 (Form 1040), but it directs filers to www.irs.gov/Form1040 for the latest information regarding deadlines. This form must be attached when filing Form 1040, 1040-SR, or 1040-NR.
Checklist
What you need before filling it out
Foreign tax credit
Form 1116 · Part I, Line 1
Residential clean energy credit
Form 5695 · Part I, Line 5a
Net premium tax credit
Form 8962 · Part II, Line 9
Section 1341 credit for repayment
Not stated in the official source · Part II, Line 13a
Total other nonrefundable credits (Line 7)
Sum of lines 6a through 6z · Part I, Line 7
Before you submit
- 1Ensure Name(s) shown on Form 1040, 1040-SR, or 1040-NR are correctly entered in Part I.
- 2If claiming a Foreign tax credit, attach Form 1116 to support the entry on line 1 of Schedule 3 (Form 1040).
- 3If claiming Credit for child and dependent care expenses, ensure Form 2441 is attached to support the entry on line 2.
- 4If claiming Education credits, attach Form 8863 to support the entry on line 3 of Schedule 3 (Form 1040).
- 5If claiming a Residential clean energy credit, ensure Form 5695 is attached to support the entry on line 5a.
- 6If listing other nonrefundable credits under lines 6a through 6j, verify the corresponding attachment form number and name (e.g., Attach Form 3800 for General business credit).
- 7Verify that Total other nonrefundable credits (line 7) correctly sums up lines 1 through 4, 5a, 5b, and line 7 itself.
- 8Confirm that the final total of all additional credits and payments (line 31 on Form 1040, 1040-SR, or 1040-NR) is correctly calculated by adding lines 9 through 12 and line 14.
How to file this form
- 1Complete Part I by listing and totaling all nonrefundable credits from lines 1 through 6z.
- 2Calculate Part II by summing up Net premium tax credit (line 9), extension payment (line 10), excess SS/RRTA withholding (line 11), fuel tax credit (line 12), and other refundable credits (lines 13a-13z) to arrive at line 15.
- 3Enter the total from Part I (line 8) onto Form 1040, 1040-SR, or 1040-NR, line 20.
- 4Enter the total from Part II (line 15) onto Form 1040, 1040-SR, or 1040-NR, line 31.
- 5Attach all necessary supporting forms (such as Form 8962 for the net premium tax credit) to Schedule 3.
- 6Sign and date the completed IRS Form 1040S3 before submitting it with the main tax return.
Known limitations
- 1Schedule 3 (Form 1040) does not apply to a filer who is using Form 1040-NR unless they are filing with Form 1040, 1040-SR, or 1040-NR.
- 2The form requires attachment to Form 1040, 1040-SR, or 1040-NR; it is not a standalone submission.
- 3Specific credits are tied to other forms; for example, the Residential clean energy credit comes from Form 5695, line 15.
Field map
Compact field-by-field guide
Personal Info
3 items
Enter your legal first and last name as shown on your Social Security card.
Your SSN must match IRS records exactly.
Current mailing address including street, city, state, and ZIP code.
Filing Status
1 items
Select: Single, Married Filing Jointly, Married Filing Separately, Head of Household, or Qualifying Surviving Spouse.
Income
1 items
Sum of all income sources — wages, interest, dividends, business income, capital gains, unemployment, retirement, and other income.
Adjustments
1 items
Total income minus above-the-line deductions such as IRA contributions, student loan interest, and HSA contributions.
Deductions
1 items
Choose the higher of the standard deduction for your filing status or total itemized deductions from Schedule A.
Tax
1 items
AGI minus deductions. This determines your tax bracket and the amount of tax owed.
Payments
1 items
Sum of federal tax withheld, estimated tax payments, and refundable credits like the Child Tax Credit.
Signatures
1 items
You must sign and date the return. Unsigned returns are invalid.
Almost done reviewing the fields?
Fillable formOpen in Editor->The current edition of IRS Form 1040S3 is dated 20/25, and filers should go to www.irs.gov/Form1040 for instructions and the latest information.
What changed or needs a fresh check
- Edition date — confirm the revision date reads 20/25.
- Attachment sequence number — confirm it is labeled as 03.
- Form purpose — confirm the title is '1040 (Schedule 3)' and its function is detailing additional credits and payments.
- Instructions location — confirm directions are available at www.irs.gov/Form1040.
Quick Facts
Downloads
After you file
- 1Retain a copy of the completed Schedule 3 (Form 1040) when filing.
- 2The form must be attached to Form 1040, 1040-SR, or 1040-NR when submitting.
- 3If attaching for instructions, refer to www.irs.gov/Form1040 for the latest information.
- 4Schedule 3 (Form 1040) is identified by Attachment Sequence No. 03.
Sources
- SRCInstructions p.1 — Schedule 3 attaches to Form 1040, 1040-SR, or 1040-NR.
- SRCInstructions p.1 — Line 1 is for Foreign tax credit and requires attaching Form 1116 if needed.
- SRCInstructions p.1 — Line 2 covers the Credit for child and dependent care expenses from Form 2441, line 11.
- SRCInstructions p.1 — Line 8 states that totals from lines 1 through 4, 5a, 5b, and 7 are entered on Schedule 3 (Form 1040) and Form 1040, 1040-SR, or 1040-NR, line 20.
- SRCInstructions p.1 — Line 9 is for Net premium tax credit, requiring attachment of Form 8962.
- SRCInstructions p.1 — Line 15 states that totals from lines 9 through 12 and 14 are entered on Schedule 3 (Form 1040) and Form 1040, 1040-SR, or 1040-NR, line 31.
Common confusion points
Where do I put the total of all my nonrefundable credits?
This number must be entered on line 8 and also on Form 1040, 1040-SR, or 1040-NR, line 20.
→ Check that you added lines 1 through 4, 5a, 5b, and 7 to get this total.
What is the difference between Part I (Nonrefundable Credits) and Part II (Other Payments and Refundable Credits)?
Part I credits reduce tax liability but do not create a refund; Part II items can result in payments or refunds.
→ Verify that you are adding lines 1 through 4, 5a, 5b, and 7 for Part I totals.
Do I need to attach Form 1116 if I claim the Foreign tax credit?
Yes, Form 1116 must be attached if claiming the foreign tax credit listed on line 1.
→ Ensure you have a copy of Form 1116 ready for attachment alongside Schedule 3 (Form 1040).
What is line 20 used for?
Line 20 is where the total of all nonrefundable credits from Part I must be entered on Schedule 3 (Form 1040) and also on Form 1040, 1040-SR, or 1040-NR.
→ Confirm that this amount matches your calculation from lines 8.
When should I use line 31?
Line 31 is where the total of all other payments and refundable credits from Part II must be entered on Schedule 3 (Form 1040) and also on Form 1040, 1040-SR, or 1040-NR.
→ Verify that this amount matches your calculation from line 15.
What is the purpose of the 'Other nonrefundable credits' section (line 6z)?
This area allows filers to list specific types and amounts for additional nonrefundable credits not covered by lines 6a through 6j.
→ Check that you are adding these listed items into line 7, which then rolls up to line 8.
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 3800 (used to determine certain credits, like General business credit or elective payment election)
Questions about IRS Form 1040S3
What is IRS Form 1040S3 used for?
This form helps detail extra tax breaks (credits) and payments you are claiming when filing your main Form 1040. It allows you to account for things like foreign taxes paid or energy-efficient home improvements before calculating your final tax liability. You attach this schedule directly with your primary tax return.
Who must file IRS Form 1040S3?
The form is attached by anyone filing Form 1040, Form 1040-SR, or Form 1040-NR that needs to report additional credits and payments.
What information does IRS Form 1040S3 require?
Part I lists various nonrefundable credits, such as the Foreign tax credit (Line 1) or Residential clean energy credit (Line 5a). Part II details other payments and refundable credits, like the Net premium tax credit (Line 9) or Section 1341 credit (Line 13a).
When is IRS Form 1040S3 due?
The source does not state a specific due date; rather, it directs filers to go to www.irs.gov/Form1040 for instructions and the latest information regarding deadlines.
Where do I file IRS Form 1040S3?
Filers must attach Schedule 3 (Form 1040) to Form 1040, Form 1040-SR, or Form 1040-NR. The form itself does not specify a single service center for mailing; it directs users to the instructions found at www.irs.gov/Form1040.
How do I complete IRS Form 1040S3?
First, complete Part I by listing all nonrefundable credits (Lines 1 through 7). Next, fill out Part II by detailing other payments and refundable credits (Lines 9 through 15). The total amounts from both parts are then entered onto the corresponding lines of Form 1040, 1040-SR, or 1040-NR.
What happens if IRS Form 1040S3 is filed incorrectly?
If credits and payments are incorrectly reported on Schedule 3 (Form 1040), the final amounts entered onto Form 1040, 1040-SR, or 1040-NR lines 20 or 31 will be wrong, affecting your refund or tax due.
Where do I put the total of all my nonrefundable credits?
This number must be entered on line 8 and also on Form 1040, 1040-SR, or 1040-NR, line 20. Check that you added lines 1 through 4, 5a, 5b, and 7 to get this total.
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