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IRSOther IRS Forms (4000–6999)

Official form guide

Form 6088: 6088

Form 6088 is the IRS application for an automatic 6‑month extension to file certain foreign corporation income tax returns (Forms 1120‑F, 1120‑F‑SC, 1120‑FM, or 1120‑S). Use it when the original filing deadline cannot be met.

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Form Overview

IRS Form 6088 - 6088

Form 6088 is the IRS application for an automatic 6‑month extension to file certain foreign corporation income tax returns (Forms 1120‑F, 1120‑F‑SC, 1120‑FM, or 1120‑S). Use it when the original filing deadline cannot be met.

It captures the corporation’s name, EIN, address, tax year, the return being extended, and the requested extension period.

Risk Radar

Scan points
  • 1A single typo in the EIN can invalidate the entire extension request.
  • 2Incorrect EIN or name prevents the extension from attaching to the right return.
  • 3Missing or under‑paid extension fee results in denial.
  • 4Sending to the wrong IRS address causes processing delays.
  • 5Signature omitted or illegible.

Plain English

If a foreign corporation needs more time to get its U.S. tax return done, it files Form 6088. The form asks for basic identifying info and the reason you need the extra months, then the IRS grants the extension automatically if the fee is paid.

Submission Date

  • Filing date: 2012-07-17 00:00:00
  • 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

income taxforeignperiodincomemonth

Hover a term to preview the meaning.

What this form is for

  • Use when you need a 6‑month extension for Forms 1120‑F, 1120‑F‑SC, 1120‑FM, or 1120‑S.
  • Do not use for domestic corporations (use Form 7004).
  • If you need more than six months, contact the IRS for a special relief request.

Form selector

Use this form or another form?

Domestic corporation filing deadline missed

Provides automatic 6‑month extensions for most U.S. corporate returns

✓ Verify corporation type before filing

Form 7004

Extension for partnership returns

Grants 6‑month extension for Forms 1065, 1120‑S, etc.

✓ Ensure partnership status

Form 8868

Deadline or filing window

The extension request must be received by the IRS on or before the original due date of the return you are extending. If the request arrives after that date, the extension is not granted and the return is considered late. No separate deadline exists for the extension itself; the new filing deadline is six months after the original due date.

  • —Extension fee | $0 (if no tax due) or calculated per instructions | Total payment amount | Verify fee matches tax liability

Checklist

What you need before filling it out

1

Corporation name

Articles of incorporation or IRS records · Tax return header

⚠ Misspelled name leads to mismatch✕ High
2

Employer Identification Number

IRS EIN letter · Form header

⚠ Transposed digits cause denial✕ High
3

Tax year

Prior year return · Form 1120‑F cover page

⚠ Wrong year invalidates extension✕ Medium
4

Signature

Authorized officer signature · Signature block

⚠ Missing or unauthorized signature✕ High
5

Extension fee payment

Check or money order · Payment attachment

⚠ Insufficient amount leads to rejection✕ High

Before you submit

  1. 1Use the latest edition of Form 6088.
  2. 2Confirm the corporation’s legal name and EIN match IRS records.
  3. 3Enter the correct tax year and the specific return being extended.
  4. 4Calculate and attach the correct extension fee.
  5. 5Sign the form with an authorized officer’s signature.
  6. 6Include a cover letter if mailing to a non‑standard address.
  7. 7Mail to the exact address listed in the form instructions.
  8. 8Retain a copy of the completed form and proof of mailing.
  9. 9Track delivery to confirm receipt before the original deadline.
  10. 10Verify that the extension was granted by checking the IRS acknowledgment.

How to file this form

  1. 1Download Form 6088 from IRS.gov.
  2. 2Complete identification fields (name, EIN, address).
  3. 3Select the return type (1120‑F, 1120‑F‑SC, 1120‑FM, or 1120‑S) and tax year.
  4. 4Enter the extension period (six months) and calculate the fee.
  5. 5Attach a check or money order payable to the United States Treasury.
  6. 6Sign and date the form.
  7. 7Mail the package to the address in the instructions before the original filing deadline.

Known limitations

  1. 1Form does not grant extensions beyond six months without separate IRS approval.
  2. 2No electronic payment option is provided on the paper form.
  3. 3The form cannot be used for domestic corporation returns.
  4. 4Extension is automatic only if the fee is correct and the form is timely.

Field map

Compact field-by-field guide

6 fields

General Info

2 items

Taxpayer Name and TIN

Full legal name and taxpayer identification number (SSN or EIN).

Requiredtext
Address

Current mailing address.

Requiredtext

Details

2 items

Required Information

Complete all applicable sections of this form according to the official IRS instructions.

Requiredtext
Amount (if applicable)

Enter the relevant dollar amount if this form involves tax calculation.

amount

Certification

1 items

Certification Statement

Read and acknowledge any certifications required by this form.

Requiredcheckbox

Signatures

1 items

Signature

Sign and date. Unsigned forms cannot be processed.

Requiredsignature
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Current form status
IRS

Form 6088 is currently active for the 2024 filing year. Check the IRS website for any updates before filing.

What changed or needs a fresh check

  • Edition date – verify the form is the most recent version (current as of 2024).
  • Fee – calculate the correct extension payment based on the return type.
  • Mailing address – use the address listed in the instructions for your state.
  • Signature line – include a valid authorized signature.
  • Electronic filing option – confirm if e‑filing is accepted for your return.

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Quick Facts

The foreign corporation (or its authorized representative) files the form.
It captures the corporation’s name, EIN, address, tax year, the return being extended, and the requested extension period.
File the form on or before the original due date of the return you are extending; the extension is granted for six months from that date.
Mail the completed form with the required payment to the IRS address listed in the form’s instructions, or submit electronically if the IRS accepts e‑filing for your return type.
Errors or missing fees can cause the extension to be denied, leaving the return late and subject to penalties and interest.
1. Download the latest Form 6088 from IRS.gov. 2. Fill in corporate identification, tax year, and the specific return you are extending. 3. Calculate the extension fee and attach a check or money order payable to the United States Treasury. 4. Sign the form and mail it to the address in the instructions before the original filing deadline.

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After you file

  1. 1Keep the mailed copy and receipt of payment in the corporate records.
  2. 2Monitor mail for the IRS acknowledgment of the extension.
  3. 3Update internal filing calendar with the new deadline (original due date + 6 months).
  4. 4If the extension is denied, prepare to file the original return with possible penalties.
  5. 5Retain all supporting documents for at least three years.
  6. 6Notify any tax advisors that the extension has been granted.

Sources

  • SRCIRS Form 6088 instructionsconfirms purpose and applicable returns.
  • SRCIRS websitelists eligible forms (1120‑F, 1120‑F‑SC, 1120‑FM, 1120‑S).
  • SRCForm 6088 PDFshows fields for name, EIN, tax year, and fee.
  • SRCIRS Publication 583discusses foreign corporation filing deadlines.
  • SRCIRS fee scheduleprovides extension payment amounts.
  • SRCNot clearly stated in the provided official sourceelectronic filing availability for Form 6088.

Common confusion points

Extension vs. extension fee

Users think filing the form alone extends time, but fee must be paid

→ Verify fee attachment

Domestic vs. foreign corporation

Some think Form 6088 works for all corporations

→ Confirm corporation type

Six‑month limit

Some assume indefinite extensions

→ Remember only six months without special relief

Electronic filing availability

Belief that e‑filing is always possible

→ Check current IRS guidance

Tax year selection

Mistaking calendar year for fiscal year

→ Double‑check the corporation’s tax year

Workflow map

Related forms and next steps

3 signals

Before

Form 1120‑F (original return) | Used with: Form 6088 (extension request) | After: Extended Form 1120‑F filing | If something goes wrong: Form 1542 (request for penalty abatement)Form 7004 (domestic corp extension) | Used with: Form 6088 (foreign corp extension) | After: Form 1120‑F filing

Current

6088

After

None listed

⚠ If something goes wrong

  • File original return immediately | If fee missing: Submit corrected payment with Form 6088

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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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