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IRSOther IRS Forms (7000–9999)

Official form guide

Form 921A: 921-A

Form 921‑A is the IRS application to request an automatic six‑month extension to file an individual income tax return (Form 1040). Use it when you cannot meet the regular filing deadline.

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Form Overview

IRS Form 921A - 921-A

Form 921‑A is the IRS application to request an automatic six‑month extension to file an individual income tax return (Form 1040). Use it when you cannot meet the regular filing deadline.

The form captures your name, address, Social Security number, estimated tax liability, and the amount you will pay with the extension request.

Risk Radar

Scan points
  • 1A single typo can invalidate the extension and trigger penalties.
  • 2Incorrect Social Security number
  • 3Underestimating tax owed
  • 4Missing the April deadline
  • 5Sending to the wrong IRS address

Plain English

If you need more time to finish your personal tax return, you fill out this short form and send it to the IRS. It gives you until October 15 to file the actual return, but it does not extend the time to pay any tax you owe.

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

individualincome taxliabilityincomemonth

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What this form is for

  • Use when you need a six‑month filing extension for an individual return.
  • Do not use if you are filing a corporate or partnership return.
  • If you need an extension for a foreign‑earned income exclusion, see Form 4868.

Form selector

Use this form or another form?

Corporate return deadline missed

Extends corporate returns

✓ Verify entity type before filing

Form 7004

Business income schedule missing

Extends individual return with additional schedules

✓ Confirm attachment requirement

Form 4868 with attachment

Deadline or filing window

The extension request must be received by the IRS on or before the regular filing deadline (typically April 15). If mailed, postmark counts; if e‑filed, transmission receipt counts. The extended filing deadline is October 15 of the same year.

  • —Estimated tax liability | Sum of all tax lines on Form 1040 | Total tax due | Round to nearest dollar

Checklist

What you need before filling it out

1

Name and SSN

Social Security card or prior year return · Form 1040 line 1

⚠ Misspelled name✕ High
2

Address

Utility bill or driver’s license · Form 921‑A line 2

⚠ Out‑of‑date address✕ Medium
3

Estimated tax liability

Prior year return and current W‑2s · Form 921‑A line 4

⚠ Under‑estimate✕ High
4

Payment amount

Bank statement or check copy · Form 921‑A line 5

⚠ No payment attached when required✕ Medium

Before you submit

  1. 1Verify SSN matches IRS records
  2. 2Confirm estimated tax amount is accurate
  3. 3Check that the form is signed and dated
  4. 4Attach a payment if you owe tax
  5. 5Use the correct IRS mailing address for your state
  6. 6Ensure postmark or e‑file receipt is on or before April 15
  7. 7Retain a copy of the completed form for your records

How to file this form

  1. 1Gather W‑2s, 1099s, and prior year return
  2. 2Calculate total tax liability and balance due
  3. 3Complete personal info and liability sections on Form 921‑A
  4. 4Choose payment method and attach payment if applicable
  5. 5Sign and date the form
  6. 6Mail to the state‑specific IRS address or submit via an approved e‑file provider
  7. 7Confirm receipt by checking USPS tracking or e‑file confirmation

Known limitations

  1. 1Form does not extend the deadline to pay tax owed
  2. 2Only provides an automatic six‑month extension; longer extensions require separate approval
  3. 3Electronic filing is limited to approved software providers
  4. 4IRS may reject the form for mismatched SSN or address

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 921‑A is active for the 2024 tax year. The latest revision is dated January 2024. Check the IRS website for any updates before filing.

What changed or needs a fresh check

  • Edition date: January 2024 (verify on IRS site)
  • Fee: No filing fee for the extension request itself
  • Mailing address: Use address specific to your state as listed in the instructions
  • Electronic filing: Only through IRS‑approved e‑file providers
  • Signature requirement: Must be original handwritten signature unless e‑filed

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Form 921A page 1

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Quick Facts

Any individual taxpayer who expects to miss the April filing deadline files this form.
The form captures your name, address, Social Security number, estimated tax liability, and the amount you will pay with the extension request.
File Form 921‑A by the original filing deadline (usually April 15) to receive an automatic extension to October 15.
Mail the completed form to the IRS address listed in the instructions for your state, or submit electronically through an approved e‑file provider.
Errors can cause the extension to be denied, leading to late‑filing penalties and interest on any unpaid tax.
1. Gather your most recent tax documents and estimate total tax owed. 2. Complete the personal identification section and calculate the balance due. 3. Choose the payment option (pay now, pay later, or request a payment plan). 4. Sign and date the form. 5. Mail or e‑file it before the April deadline.

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After you file

  1. 1Keep the mailed copy and any receipt or tracking number
  2. 2Monitor your bank account for the payment confirmation (if paid with a check or electronic transfer)
  3. 3Mark October 15 on your calendar as the new filing deadline
  4. 4If you receive a notice of rejection, correct the error and re‑submit promptly
  5. 5File the actual Form 1040 by the extended deadline
  6. 6Retain all extension documentation with your tax records for at least three years

Common confusion points

Extension vs. payment deadline

Taxpayers think the extension also postpones payment

→ Verify balance due and pay by original deadline

Form 921‑A vs. Form 4868

Both request extensions but 4868 is the short form for most taxpayers

→ Use 921‑A only when a payment is attached or special circumstances apply

Mailing address selection

Addresses differ by state and by whether you are enclosing a payment

→ Double‑check the address list in the instructions

Electronic filing availability

Not all software supports 921‑A

→ Confirm provider’s capability before preparing

Signature requirement

E‑filed forms still need a valid electronic signature

→ Ensure the e‑signature is accepted by the IRS

Workflow map

Related forms and next steps

12 signals

Before

Gather tax documents (W{cccccccccccccccccccccccceT

Current

921A

After

None listed

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Source transparency

Copyright & Licensing - US Government Forms

Independent guide

BrieflyGo links to and explains official public form sources. We are not a government agency, and this page is for general form guidance, not legal advice.

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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