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Official form guide
IRS Form 8874‑B is an application for an automatic extension of time to file certain foreign corporation income tax returns. Use it when you need extra months to submit Form 1120‑F, 1120‑FSC, or similar returns.
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IRS Form 8874‑B is an application for an automatic extension of time to file certain foreign corporation income tax returns. Use it when you need extra months to submit Form 1120‑F, 1120‑FSC, or similar returns.
Plain English
If a foreign corporation can’t finish its U.S. tax return by the regular deadline, it can ask the IRS for more time using Form 8874‑B. The form tells the IRS why the extra time is needed and how long the extension should be.
Submission Date
AI co-pilot
Form selector
Extension needed > 6 months
Allows longer extensions with IRS approval
✓ Verify eligibility before filing
Domestic corporation filing
Only for U.S. corporations
✓ Wrong form leads to denial
The extension request must be received by the IRS on or before the original filing deadline of the underlying return. If the request arrives after that date, the automatic extension does not apply and penalties may accrue. The IRS does not provide a separate calendar deadline for Form 8874‑B itself.
Checklist
Taxpayer identification number
Employer Identification Number (EIN) · Form 8874‑B, top box
Return being extended
Copy of Form 1120‑F filing notice · Section 1 of Form 8874‑B
Requested extension period
Internal project timeline · Line 4
Signature
Authorized officer’s handwritten or electronic signature · Signature block
Field map
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 8874‑B is active for the 2024 tax year. The IRS has not announced any upcoming revisions.
Quick Facts
Downloads
Extension length
Users think any number of months is allowed
→ Verify the automatic limit (usually 6 months)
Form number
Mistaking Form 8874‑B for Form 8868
→ Check the purpose column in the IRS index
Mailing address
Using the generic IRS address
→ Use the address specific to the underlying return
Signature type
Assuming an electronic signature is always accepted
→ Confirm e‑file support for the form
Eligibility
Assuming domestic corporations can use this form
→ Domestic entities must use Form 1127
Workflow map
Before
Current
After
Often used with
⚠ If something goes wrong
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