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IRSOther IRS Forms (4000–6999)

Official form guide

Form 4423: 4423

IRS Form 4423 is the Application for Extension of Time to File a partnership return (Form 1065). Use it when a partnership needs more than the standard March 15 deadline to file its return.

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Form Overview

IRS Form 4423 - 4423

IRS Form 4423 is the Application for Extension of Time to File a partnership return (Form 1065). Use it when a partnership needs more than the standard March 15 deadline to file its return.

It captures the partnership’s name, EIN, tax year, reason for the extension request, and the estimated tax liability.

Risk Radar

Scan points
  • 1A single typo in the EIN can invalidate the entire extension request.
  • 2Incorrect EIN or partnership name
  • 3Missed deadline for filing the extension
  • 4Failure to estimate tax liability accurately
  • 5Signature missing or unsigned form

Plain English

If your partnership can't finish its tax return by the March deadline, you file Form 4423 to ask the IRS for an automatic six‑month extension. The extension only covers filing, not payment of any tax due.

Submission Date

  • Filing date: 2016-08-19 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

partnershipliabilitypaymentmonth

Hover a term to preview the meaning.

What this form is for

  • Use when you need a filing extension for Form 1065.
  • Do not use for sole proprietorships or corporations.
  • Check Form 7004 if you need a combined filing and payment extension.

Form selector

Use this form or another form?

Late filing without prior extension

No automatic relief, penalties apply

✓ Verify if penalty relief is possible

Form 1065 with penalty schedule

Need both filing and payment extension

Covers multiple business returns

✓ Confirm eligibility for partnership

Form 7004

Amended partnership return after filing

Not an extension request

✓ Use only for corrections

Form 1065‑X

Deadline or filing window

The extension request must be received by the IRS on or before the original due date of the partnership return (generally March 15 for calendar‑year partnerships). If the request arrives after that date, the extension is not granted and penalties may apply. The six‑month extension moves the filing deadline to September 15, but any tax owed is still due by the original deadline.

  • —Estimated tax liability | Enter amount you expect to owe | Tax due on extension | Verify with Form 1065 calculations

Checklist

What you need before filling it out

1

Partnership EIN

IRS notice or prior return · Form 1065 header

⚠ Wrong digits cause denial✕ High
2

Tax year

Partnership's fiscal year · Articles of organization

⚠ Using calendar year by mistake✕ Medium
3

Signature

Authorized partner signature · Partnership resolution

⚠ Missing signature✕ High
4

Estimated tax

Calculation from Form 1065 worksheet · Draft return

⚠ Underestimation leads to interest✕ Medium
5

Mailing address

IRS address list · Instructions page

⚠ Sending to wrong center✕ High

Before you submit

  1. 1Use the current year’s edition of Form 4423
  2. 2Verify EIN matches prior filings
  3. 3Confirm tax year matches partnership’s fiscal year
  4. 4Calculate and enter estimated tax liability
  5. 5Sign and date the form
  6. 6Attach any required supporting statements
  7. 7Print clearly on single‑sided paper
  8. 8Use the correct IRS mailing address
  9. 9Postmark date is on or before original filing deadline
  10. 10Keep a copy of the completed form for records
  11. 11Track mailing receipt or certified mail confirmation

How to file this form

  1. 1Download Form 4423 from IRS.gov
  2. 2Enter partnership name, address, and EIN
  3. 3Select the tax year and indicate extension request
  4. 4Enter estimated tax liability and any payment made
  5. 5Sign and date the form as an authorized partner
  6. 6Place the form in an envelope with the correct IRS address
  7. 7Mail via certified mail or USPS with tracking

Known limitations

  1. 1Form does not grant a payment extension; tax must be paid by original due date
  2. 2Electronic filing is not accepted for this form
  3. 3IRS may reject the request if the partnership has a history of late filings
  4. 4Only one extension per tax year is allowed
  5. 5The form provides an automatic six‑month extension only if filed on time

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 4423 is active for the 2024 tax year. The IRS updates the form annually; verify the edition date before use.

What changed or needs a fresh check

  • Edition date – ensure the form is the current year’s version
  • Fee – no fee for Form 4423
  • Mailing address – use the address in the instructions for your state
  • Signature line – must be signed by an authorized partner or officer
  • Electronic filing – not accepted; must be paper‑filed

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Form 4423 page 1

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Quick Facts

The partnership (or its authorized representative) files the form.
It captures the partnership’s name, EIN, tax year, reason for the extension request, and the estimated tax liability.
File by the original due date of the partnership return, typically March 15 for calendar‑year partnerships.
Mail the completed form to the address listed in the IRS instructions for the partnership’s filing location, or fax if the IRS permits for that year.
Errors can cause the extension to be denied, leading to late‑filing penalties and interest on any unpaid tax.
1. Download the latest Form 4423 PDF from IRS.gov. 2. Fill in partnership identification, tax year, and estimated tax. 3. Sign and date the form. 4. Attach any required statements and mail to the correct IRS address before the original filing deadline.

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After you file

  1. 1Save the mailed copy and receipt in partnership records
  2. 2Monitor IRS correspondence for acceptance notice
  3. 3Pay any estimated tax by the original deadline to avoid interest
  4. 4Prepare the full Form 1065 for filing by the extended deadline
  5. 5If the extension is denied, file the return immediately and assess penalties
  6. 6Update the partnership’s internal filing calendar with the new deadline
  7. 7Retain all supporting calculations for future audits

Sources

  • SRCIRS Form 4423 PDF title and purposefound on IRS.gov
  • SRCExtension deadline detailsIRS instructions for Form 4423
  • SRCSignature requirementForm 4423 line instructions
  • SRCMailing address listIRS Publication 1345 referenced in instructions
  • SRCNo fee statementIRS Form 4423 instructions
  • SRCElectronic filing restrictionIRS filing guidelines for Form 4423
  • SRCEligibility and one‑extension ruleIRS Form 4423 instructions

Common confusion points

Extension vs. payment extension

Many think the extension also delays payment

→ Verify payment is still due on original date

Form 4423 vs. Form 7004

Both request extensions but apply to different entities

→ Use 4423 only for partnerships

Eligibility for automatic extension

Some partnerships have special rules

→ Confirm partnership status in instructions

Mailing address changes

IRS address updates annually

→ Check current instructions before mailing

Signature authority

Not all partners can sign

→ Ensure signer is authorized per partnership agreement

Estimated tax calculation

Partners often underestimate

→ Re‑run draft Form 1065 to confirm amount

Electronic filing misconception

Some think e‑filing is possible

→ Form 4423 requires paper filing

Workflow map

Related forms and next steps

5 signals

Before

Form 1065 (partnership return) preparation

Current

4423

After

Form 1065 filing by September 15 (extended deadline)

Often used with

Form 7004 (combined filing and payment extension) if payment extension needed

⚠ If something goes wrong

  • Notice of Rejection from IRS – review and resubmit corrected Form 4423
  • Pay estimated tax using Form 8109‑B or electronic payment

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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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