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Official form guide
Form 1045: 1045
Form 1045, Application for Tentative Refund, lets taxpayers request a quick refund of overpaid tax when they have a net operating loss or certain credits. Use it to get a provisional refund before filing an amended return.
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IRS Form 1045 - 1045
Form 1045, Application for Tentative Refund, lets taxpayers request a quick refund of overpaid tax when they have a net operating loss or certain credits. Use it to get a provisional refund before filing an amended return.
Risk Radar
Scan points- 1A single math error can nullify the entire tentative refund request.
- 2Incorrect loss or credit calculation
- 3Missing signature or date
- 4Using the wrong IRS mailing address
- 5Submitting after the 10‑day window
Plain English
If you overpaid your taxes because of a loss or a credit, you can ask the IRS for a fast refund with Form 1045. It’s a shortcut that can give you money sooner than waiting for an amended return to be processed.
Submission Date
- Filing date: 2026-01-05 11:11:10
- 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 when you have a net operating loss or unused credit creating a tentative refund.
- Do not use if you are only correcting a filing error without a loss or credit.
- Check Form 1040X if you need a full amended return instead of a quick refund.
Form selector
Use this form or another form?
Net operating loss carryback > Form 1045 > Faster provisional refund > Verify loss carryback period first
Not clearly stated in the provided official source
✓ Not clearly stated in the provided official source
Credit carryback (e.g., general business credit) > Form 1045 > Same fast‑track benefit > Confirm credit eligibility
Not clearly stated in the provided official source
✓ Not clearly stated in the provided official source
Amended return needed > Form 1040X > Full correction, longer processing > Use if no tentative refund applies
Not clearly stated in the provided official source
✓ Not clearly stated in the provided official source
Deadline or filing window
The IRS must receive Form 1045 within 10 days of issuing a notice of tentative refund, or within one year after the original return’s due date (including extensions). Missing the window forces you to file Form 1040X instead. Exact dates depend on the tax year and notice timing.
- —Tentative refund amount | Worksheet calculation from loss/credit | Refund amount | Verify all prior refunds are subtracted
Checklist
What you need before filling it out
Tax year line
Original return copy · Form 1040/1120 etc.
Loss or credit amount
Schedule of NOL or credit carryback · Prior year returns
Prior refunds received
Refund receipt or IRS notice · Account transcripts
Signature block
Signed Form 1045 · Physical signature
Before you submit
- 1Confirm edition date matches tax year
- 2Verify all calculations with worksheets
- 3Check that prior refunds are accounted for
- 4Attach required supporting schedules
- 5Sign and date the form
- 6Use the correct IRS mailing address
- 7Include a copy of the original return
- 8Double‑check Social Security/ EIN numbers
- 9Ensure no blank required fields
- 10Retain a copy for your records
How to file this form
- 1Print the latest edition of Form 1045
- 2Fill in identification and tax‑year sections
- 3Complete the tentative refund worksheet
- 4Attach supporting schedules (e.g., NOL carryback worksheet)
- 5Sign and date the form
- 6Mail to the service center for your state or e‑file if available
- 7Track delivery with certified mail or electronic receipt
Known limitations
- 1Form only applies to net operating losses and certain credit carrybacks
- 2Not valid for refunds arising from simple overpayment without a loss/credit
- 3IRS may reject if the loss period is outside the allowed carryback window
- 4Electronic filing option is not always offered
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->Form 1045 is currently active for the 2023 tax year. The IRS updates the form annually; verify the edition date before filing.
What changed or needs a fresh check
- Edition date – ensure the form is for the correct tax year
- Fee – no filing fee for Form 1045
- Mailing address – use the address listed in the current instructions
- Signature line – must be signed by the taxpayer or authorized representative
- Attachments – include all required worksheets and schedules
Quick Facts
Downloads
After you file
- 1Keep the mailed copy and delivery proof
- 2Monitor IRS account for refund deposit or notice
- 3Record the tentative refund amount in your tax records
- 4If denied, review the rejection notice and consider filing Form 1040X
- 5Update your tax software with the refund for future planning
- 6Retain all supporting documents for at least three years
Sources
- SRCIRS Form 1045 instructionsdescription of purpose
- SRCIRS Publication 536Net Operating Losses
- SRCIRS websitefiling deadline rules for Form 1045
- SRCIRS address listmailing destinations for Form 1045
- SRCIRS e‑file availability noticenot always offered
- SRCIRS Form 1045 worksheetcalculation method
- SRCIRS Form 1040X guidancealternative when Form 1045 not appropriate
- SRCIRS Notice of Tentative Refund10‑day filing window
Common confusion points
Tentative refund vs. final refund
Many think the amount is guaranteed
→ Verify IRS notice before filing
NOL carryback period length
Different rules for different years
→ Check the specific year’s guidance
Electronic filing availability
Some years allow e‑file, others do not
→ Confirm on the IRS website
Signature requirement
Some think electronic signature works
→ Only hand‑signed forms accepted unless e‑file enabled
Deadline calculation
10‑day window vs. one‑year rule
→ Use the date on the IRS notice
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 911 (Request for Taxpayer Advocate Service assistance)
Source transparency
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