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Official form guide
Form 8879F: 8879-F
Form 8879-F is the IRS e‑file Signature Authorization for a foreign corporation’s Form 1120‑F. It is used when the corporation elects to file Form 1120‑F electronically and must provide a signed declaration that the return is accurate.
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IRS Form 8879F - 8879-F
Form 8879-F is the IRS e‑file Signature Authorization for a foreign corporation’s Form 1120‑F. It is used when the corporation elects to file Form 1120‑F electronically and must provide a signed declaration that the return is accurate.
Risk Radar
Scan points- 1An unsigned Form 8879‑F will cause the entire electronic return to be rejected.
- 2Missing officer signature
- 3Incorrect EIN or tax year
- 4Signature date after electronic submission
- 5Using the wrong mailing address
Plain English
If a foreign corporation files its U.S. corporate tax return online, it needs to sign a short paper form saying the numbers are correct. Form 8879‑F is that signature sheet. The IRS keeps it on file while the electronic return is processed.
Submission Date
- Filing date: 2025-10-30 22:10:15
- 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 filing Form 1120‑F electronically.
- Do not use for paper‑filed Form 1120‑F.
- If the corporation is a U.S. entity, use Form 8879 instead.
Form selector
Use this form or another form?
Paper filing of Form 1120-F
No signature authorization needed
✓ Verify filing method first
U.S. corporation filing electronically
Different form for domestic entities
✓ Confirm corporation classification
Deadline or filing window
Form 8879‑F must be submitted with the electronic Form 1120‑F before the corporation’s filing deadline (generally the 15th day of the 4th month after the tax year ends). Late submission will be treated as a late‑filed return and may trigger penalties.
Checklist
What you need before filling it out
Corporation name
Articles of incorporation or IRS registration · Form 1120‑F header
Employer Identification Number
IRS EIN assignment letter · Form 1120‑F summary page
Tax year
Corporate fiscal calendar · Prior year returns
Officer signature
Physical signature on Form 8879‑F · Original signed copy
Signature date
Date officer signs · Signed form
Before you submit
- 1Verify the form shows the 2023 edition date.
- 2Confirm the corporation’s name and EIN match the electronic return.
- 3Check the correct tax year box.
- 4Ensure the authorized officer’s printed name is legible.
- 5Obtain a handwritten signature and date on the signature line.
- 6Date the signature on or before the electronic submission date.
- 7Attach the signed Form 8879‑F to the e‑file package or upload as instructed.
- 8Mail to the exact address listed in the 1120‑F e‑file instructions, if mailing.
- 9Retain a scanned copy for your records.
- 10Confirm receipt acknowledgment from the IRS or e‑file provider.
How to file this form
- 1Complete Form 1120‑F in the IRS e‑file system.
- 2Generate the PDF of Form 8879‑F from the system.
- 3Print the PDF and have the authorized officer sign and date it.
- 4If mailing, place the signed form in an envelope with the e‑file confirmation receipt.
- 5If uploading, scan the signed form and upload via the e‑file provider portal.
- 6Submit and wait for the IRS acceptance notice.
- 7File a copy of the signed form with your corporate records.
Known limitations
- 1Form does not include a fee field; any fee must be paid with the underlying return.
- 2The form does not validate the officer’s authority; corporate bylaws must be consulted separately.
- 3Only applicable to foreign corporations filing Form 1120‑F electronically.
- 4No electronic signature is accepted; a handwritten signature is required.
Field map
Compact field-by-field guide
Entity Info
1 items
Name and taxpayer ID of the entity claiming the credit.
Credit Info
1 items
Type of credit or incentive being claimed.
Calculation
2 items
The base amount used to calculate the credit.
Calculated credit amount after applying formulas and limitations.
Certification
1 items
Detailed breakdown supporting the credit calculation.
Signatures
1 items
Sign and date the form.
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Fillable formOpen in Editor->Form 8879‑F is currently active for tax years 2020 onward. No known revisions have been issued after the 2023 edition.
What changed or needs a fresh check
- Edition date: Verify the form shows the 2023 revision date.
- Fee: No filing fee for Form 8879‑F itself.
- Mailing address: Use the address in the 1120‑F e‑file instructions.
- Signature line: Ensure the officer’s printed name matches the signature.
- Tax year box: Confirm the correct calendar or fiscal year is checked.
Quick Facts
Downloads
After you file
- 1Save the IRS acceptance notice in the corporate tax file.
- 2Store the signed Form 8879‑F with the original Form 1120‑F.
- 3Track the filing date for future penalty calculations.
- 4Monitor any IRS correspondence for requests for additional documentation.
- 5Update internal filing logs with the submission method used.
- 6Retain all records for at least three years from the filing date.
Sources
- SRCIRS Instructions for Form 8879‑Fconfirms purpose and filing method.
- SRCIRS Publication 542outlines filing requirements for foreign corporations.
- SRCIRS e‑file Provider Guidelinesdetails where to submit the signed form.
- SRCForm 8879‑F PDF headershows edition date 2023.
- SRCIRS Form 1120‑F filing deadline rulesestablishes typical deadline timing.
- SRCNot clearly stated in the provided official source
Common confusion points
Form 8879‑F vs. Form 8879
Different forms for foreign vs. domestic corporations
→ Verify corporation type before signing
Electronic vs. paper filing
Some taxpayers think the signature can be electronic
→ Only handwritten signatures are accepted on 8879‑F
Mailing address
Instructions list multiple addresses
→ Use the address specific to the e‑file provider’s location
Signature date
Date after submission can cause rejection
→ Sign before transmitting the electronic return
Officer authority
Not all officers may be authorized
→ Check corporate resolution or bylaws
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 1120‑F paper filing with a signed Form 8879‑F attached
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