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IRSOther IRS Forms (1000–1999)

Official form guide

Form 15644: 15644

IRS Form 15644 is an application for an automatic 6‑month extension to file a U.S. individual income tax return. Use it when you cannot meet the regular filing deadline for your Form 1040NR or 1040NR‑EZ.

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Form Overview

IRS Form 15644 - 15644

IRS Form 15644 is an application for an automatic 6‑month extension to file a U.S. individual income tax return. Use it when you cannot meet the regular filing deadline for your Form 1040NR or 1040NR‑EZ.

The form captures taxpayer name, SSN/ITIN, address, tax year, and the reason for the extension request.

Risk Radar

Scan points
  • 1A single missed deadline can trigger penalties that outweigh the benefit of an extension.
  • 2Missing the original filing deadline
  • 3Incorrect SSN/ITIN
  • 4Wrong mailing address
  • 5Unsigned form

Plain English

If you’re a non‑resident alien or a dual‑status taxpayer and need extra time to get your tax return ready, you fill out Form 15644. It asks for basic personal info and the tax year you’re extending, then the IRS grants you up to six more months to file.

Submission Date

  • Filing date: 2026-04-08 14:10:38
  • 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 taxincomemonth

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What this form is for

  • Use when you need a 6‑month extension for Form 1040NR/1040NR‑EZ.
  • Do not use for extensions of corporate or partnership returns.
  • If you are a U.S. resident filing Form 4868, use that instead.

Form selector

Use this form or another form?

Need to extend a resident individual return

Applies to U.S. residents only

✓ Verify residency status first

Form 4868

Extending a partnership return

Automatic 6‑month extension for partnerships

✓ Confirm partnership filing requirement

Form 7004

Deadline or filing window

The extension request must be postmarked on or before the regular filing deadline (typically April 15 for calendar‑year returns). If the deadline is missed, the extension is not granted and penalties may apply. The IRS does not provide a separate deadline for the extension itself; the original deadline governs.

Checklist

What you need before filling it out

1

Taxpayer name

Government‑issued ID or passport · Tax return header

⚠ Misspelled name✕ High
2

SSN/ITIN

ITIN notice or SSN card · Identification section

⚠ Transposed digits✕ High
3

Tax year

Prior year’s return · Top of form

⚠ Wrong year entered✕ Medium
4

Signature

Handwritten signature · Signature block

⚠ Missing or illegible✕ High
5

Mailing proof

Certified mail receipt · Filing envelope

⚠ No receipt✕ Medium

Before you submit

  1. 1Use the latest edition of Form 15644
  2. 2Verify SSN/ITIN matches IRS records
  3. 3Confirm the tax year matches the return you are extending
  4. 4Sign the form in ink
  5. 5Attach any required ITIN documentation
  6. 6Print clearly; avoid smudges
  7. 7Place the form in an envelope addressed to the correct IRS location
  8. 8Use certified or registered mail and keep the tracking number
  9. 9Retain a copy of the completed form and mailing receipt
  10. 10Check that the postmark date is on or before the filing deadline

How to file this form

  1. 1Download Form 15644 from IRS.gov
  2. 2Enter personal information exactly as it appears on your tax return
  3. 3Select the correct tax year and indicate you are requesting a 6‑month extension
  4. 4Sign and date the form
  5. 5Attach any required ITIN documentation
  6. 6Mail to the address in the Instructions before the original deadline
  7. 7Save the mailing receipt as proof of timely filing

Known limitations

  1. 1Form does not grant an extension for corporate or partnership returns
  2. 2No electronic filing option for all taxpayer categories
  3. 3Extension is automatic only if filed on time; late filings are not accepted
  4. 4The form does not calculate any tax due; you must estimate and pay any owed tax separately

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 15644 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 dated for the current tax year
  • Fee – no filing fee required
  • Mailing address – use the address in the current Instructions
  • Signature line – must be signed by the taxpayer or authorized representative
  • Electronic submission option – verify if e‑file is available for your case

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Quick Facts

Non‑resident aliens, dual‑status aliens, or U.S. citizens living abroad who need more time to file their individual return.
The form captures taxpayer name, SSN/ITIN, address, tax year, and the reason for the extension request.
File the form by the original filing deadline (usually April 15 for calendar‑year returns) to receive an automatic extension.
Mail the completed form to the address listed in the Instructions for Form 15644, or submit electronically if the IRS e‑file system supports it for your situation.
Errors can cause the extension to be denied, leaving you liable for late‑filing penalties and interest.
1. Download the latest Form 15644 PDF from IRS.gov. 2. Fill in personal details, tax year, and sign. 3. Attach any required supporting documents (e.g., ITIN notice). 4. Mail to the correct IRS address before the filing deadline. 5. Keep a copy of the stamped envelope as proof of timely filing.

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After you file

  1. 1Keep the copy of the mailed form and receipt for at least three years
  2. 2Monitor your mail for any IRS notice confirming the extension
  3. 3If you receive a denial, file the return immediately to avoid penalties
  4. 4Pay any estimated tax owed by the original deadline to limit interest
  5. 5Track the new filing deadline (original deadline + 6 months) on your calendar
  6. 6Update your records if you later obtain a different SSN/ITIN

Sources

  • SRCForm 15644 title and purposeIRS official form name
  • SRCEligibilitynon‑resident alien and dual‑status taxpayer extension rules
  • SRCNo feeindicated in the Instructions
  • SRCMailing addresslisted in the current year’s Instructions
  • SRCSignature requirementsignature line present on the form
  • SRCEdition dateform header shows year
  • SRCExtension lengthautomatic 6‑month period per IRS guidance
  • SRCNot found in provided sourceelectronic filing availability

Common confusion points

Extension vs. payment deadline

Taxpayers think the extension also postpones payment

→ Verify payment is still due by original deadline

Form 15644 vs. Form 4868

Both are extension requests

→ Check residency status before selecting

ITIN vs. SSN requirement

Some think either works

→ Use the number that matches IRS records for the taxpayer

Electronic filing availability

Some assume all forms can be e‑filed

→ Confirm e‑file support in the Instructions

Mailing address changes yearly

Users send to old address

→ Use the address listed in the current year’s Instructions

Workflow map

Related forms and next steps

4 signals

Before

Form 1040NR – Prepare your return before requesting an extension

Current

15644

After

Form 1040NR – File the actual return by the extended deadline

Often used with

Form 4868 – For U.S. residents filing a regular extension

⚠ If something goes wrong

  • Form 12153 – Request a private letter ruling if the IRS denies the extension

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Source transparency

Copyright & Licensing - US Government Forms

Independent guide

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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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