IRS and State Forms You Can Still Fax in 2026

Many agencies have moved routine filings online, but some forms and notice responses still have an official fax route. The route is document-specific: a number that accepts one IRS form may reject another.

This guide is an overview, not a substitute for the current form instructions or a notice addressed to you. Re-check the agency source before every deadline-sensitive send.

Why some government workflows still use fax

Agencies generally publish fax for operational reasons, not because fax is inherently secure or legally superior:

1. Existing intake systems: specialized units may already route incoming fax images into a work queue.
2. Signed-paper workflows: fax can move a scanned, signed page faster than postal mail when an official route exists.
3. Transmission records: a sender can keep the completion report and timestamp as evidence of the transmission attempt.

A successful report is not an agency acceptance notice and does not cure a wrong number, missing signature, late receipt, or ineligible filing method.

Federal IRS Workflows: Supported Forms and Rules

The Internal Revenue Service enforces strict distinctions between forms that can be faxed and forms that must be e-filed or mailed.

+-------------------------------------------------------------------------+
|                       IRS FILING CHANNEL SUMMARY                        |
+-------------------------------------------------------------------------+
| OFFICIAL FAX ROUTES EXIST                 DO NOT USE A GENERAL FAX      |
| ---------------------------------------   ----------------------------- |
| * Form SS-4 (EIN Applications)            * Form 1040 (Individual Return)|
| * Form 5472 + Pro Forma 1120 (DE LLCs)    * Form 1120 (Standard C-Corp) |
| * Form 7004 (6-Month Extension for 5472)  * Form 1065 (Partnerships)    |
| * Form 2848 (Power of Attorney to CAF)    * Form 1120-S (Standard S-Corp)|
| * Form 4506-T (Transcript Requests)       * Unsolicited Audit Responses |
| * Form 2553 (S-Corporation Elections)     *(Must e-file or mail returns)*|
| * Form 15397 (Recipient furnish extension)| * Any return/form unless    |
|                                            |   current instructions say  |
|                                            |   fax is permitted          |
+-------------------------------------------------------------------------+

1. Form SS-4: Application for Employer Identification Number (EIN)

Foreign founders, non-US residents, and domestic entities that cannot use the IRS online EIN tool can apply using Form SS-4 by an authorized method. International applicants may also have a phone option; check the current IRS instructions.

• Verified Fax Numbers:
  • Within the 50 US states & DC: 855-641-6935
  • No US residence sending from within the US: 855-215-1627
  • Outside the US (International): 304-707-9471 (dial +1-304-707-9471)
• Detailed Guide: How to apply for an EIN by fax using Form SS-4. Guided filing: EIN by Fax ($19.99).

2. Form 5472 and Pro Forma Form 1120 (Foreign-Owned US Disregarded Entities)

Foreign-owned US disregarded entities with a reportable transaction may need to file Form 5472 with a pro forma Form 1120. Review the current instructions or obtain tax advice for the entity’s facts.

• Filing Limitation: The IRS e-file system does not support pro forma 1120 filings for disregarded entities. Senders must either mail physical documents or transmit via fax.
• Verified Fax Line: Fax directly to the Ogden PIN Unit at 855-887-7737.
• Top Margin Rule: The phrase "Foreign-owned U.S. DE" must be written across the top margin of Form 1120.
• Penalty: The initial failure-to-file penalty is $25,000, with additional penalties possible if noncompliance continues after IRS notice. Review the current Form 5472 instructions for exceptions and reasonable-cause rules.
• Detailed Guide: Filing Form 5472 by fax. Guided filing: File Form 5472 ($29.99).

3. Form 7004: Extension for a return

Eligible entities can use Form 7004 to request an automatic extension for the return identified on the form. The extension is generally six months; the exact original and extended due dates depend on the entity’s tax year, weekends, holidays, and special rules.

• Form Code: Enter Code 12 (Form 1120) on Part I, Line 1.
• Verified Fax Line: For foreign-owned US DEs, fax directly to 855-887-7737.
• Detailed Guide: Form 7004 extension for Form 5472. Guided filing: File Form 7004 ($4.99).

4. Form 2553: S-Corporation Election

There is no single IRS fax number for Form 2553. The IRS routes the election to Kansas City (855-887-7734) or Ogden (855-214-7520) by the corporation’s principal-business state. An unsigned Form 2553 is not timely.

• Detailed Guide: How to Fax Form 2553 (S-Corp Election) in 2026. Re-check Where to File Form 2553 the day you send. Guided filing: File Form 2553 ($49 timely / $79 late).

5. Form 2848 and Form 4506-T (Authorizations and Transcripts)

• Form 2848 (Power of Attorney): Fax and mail submissions to the regional CAF units require handwritten signatures under the current IRS instructions. Electronic signatures are available only through the IRS online submission process. Dedicated walkthrough: How to Fax Form 2848 in 2026.
• Form 4506-T (Tax Return Transcript): Route the signed form to the current RAIVS unit listed by the IRS. Dedicated walkthrough: How to Fax Form 4506-T in 2026.
• Verification: Senders must verify current regional numbers on IRS.gov. For comprehensive instructions, see How to Fax the IRS in 2026 and our IRS Fax Numbers Directory 2026.

6. Form 15397 (Recipient statement extension)

Payers who need more time to furnish 1099 / W-2 / 1042-S (and listed) copies to recipients fax Form 15397 to TSO, live Rev. 5-2026: 877-477-0572 (US) or 304-579-4105 (international). Do not mail. This does not extend the IRS filing deadline (Form 8809). Walkthrough: How to Fax Form 15397 in 2026.

7. Social Security Administration (no national fax number)

SSA and DDS publish an eRE fax number on the disability request letter. The barcode letter must be page 1. Local office fax numbers appear only on ssa.gov/locator for that office. Do not use a third-party 833/844 “Social Security fax” list. Walkthrough: How to Fax Social Security (SSA) in 2026.

8. Form 1040 and Standard Annual Returns

Do not fax an original Form 1040, 1065, 1120, or 1120-S to a general IRS number as a substitute for filing. Use the filing method in the current instructions. If an IRS notice or employee specifically asks for a faxed response, follow that case-specific direction. See Can You Fax a Tax Return to the IRS?.

9. Form 8802: US residency certification

Form 8802 asks the IRS to say you were a US resident for a calendar year. People use it when a foreign bank or tax office wants proof before they apply a tax treaty. Example: certify 2025 so a bank in Germany will withhold at the treaty rate. The letter the IRS issues later is Form 6166. This fax does not send Form 6166.

Pay the IRS user fee on Pay.gov first ($105 for a person, $230 for a company or other applicant, on the IRS web page as of 2 October 2026). Put the confirmation number on page 1. Inside the United States, fax 877-824-9110. Otherwise use 304-707-9792. The IRS rejects more than 10 Forms 8802 or 100 pages in one transmission.

A US payer claiming a tax treaty exemption on a nonresident’s pay uses Form 8233, not Form 8802. Guided filing: Form 8802 by fax ($29.99 service fee, separate from the IRS fee). Walkthrough: How to fax Form 8802 in 2026.

State government fax workflows

State rules vary by agency, form, and sometimes county. Do not infer that an agency accepts fax merely because another state—or another unit in the same agency—does.

+-------------------------------------------------------------------------+
|                  STATE-LEVEL GOVERNMENT FAX CHANNELS                    |
+-------------------------------------------------------------------------+
| 1. Revenue / tax notices      --> Only where the form or notice says fax|
| 2. Labor / unemployment       --> Claim or employer-response forms      |
| 3. Licensing boards          --> Unit-specific forms and responses      |
| 4. Election offices          --> FPCA / ballots where state law allows  |
+-------------------------------------------------------------------------+

There is no complete national directory of federal, state, and local government fax numbers. Prefer the current agency form, notice, or .gov page over any saved number.

Common examples include state tax powers of attorney, unemployment claim responses, licensing-board correspondence, and election materials. Each one needs its own source check. A fax number published for an application may not accept an appeal, payment, or unrelated attachment. New York, Illinois, and Florida tax powers of attorney: State tax power of attorney fax numbers in 2026. Forms that are not a national fax filing, including Form 1040: What you cannot fax to the IRS in 2026.

Absentee / UOCAVA ballots (not IRS, not ordinarily HIPAA)

Returning a voted ballot by fax is state-specific and usually limited to military and overseas (UOCAVA) voters. FVAP discontinued its DoD Fax relay service on 1 August 2025; fax the county or local election office directly where state law permits. See Can You Fax an Absentee Ballot in 2026?.

Compliance and Technical Standards for Agency Faxing

These steps improve legibility and recordkeeping; they do not guarantee acceptance:

1. Resolution and contrast: Use a clean, high-contrast scan. A 300 dpi source is a practical default unless the agency specifies something else.
2. Signature: Follow the form’s signature rule. Do not assume every faxed form requires wet ink or that every electronic signature is accepted.
3. Minimal cover sheets: Include only the routing details the agency asks for. Avoid full SSNs, bank account numbers, and other sensitive data unless the official instructions specifically require them.
4. Transmission record: Retain the fax report with your records. It documents the transmission result, not legal acceptance, processing, or approval.

Send government documents with SingleFax

SingleFax provides document transmission and a completion report. The agency decides whether a filing is permitted, complete, timely, and accepted.

• Send a Single Fax: Upload your document and transmit it immediately starting at $0.99 for up to 10 pages with pay-on-success pricing at Send or Receive a Fax.
• Apply for an EIN: Complete Form SS-4, fax the IRS, and receive your official assignment letter in your email for $19.99 at Get EIN.
• File Form 5472: Prepare pro forma 1120 and Form 5472 with guided field checks and direct faxing for $29.99 at File Form 5472.
• File Form 2553: Elect S-corp status, guided Form 2553, faxed to Kansas City or Ogden, $49 timely / $79 late at File Form 2553.

Related Guides and Resources

• Can You Fax an Absentee Ballot in 2026?
• How to Fax Form 2553 (S-Corp Election) in 2026
• How to Fax Form 15397 (Recipient Statement Extension) in 2026
• How to Fax Social Security (SSA) in 2026
• HIPAA Fax Myths vs Facts in 2026
• IRS Fax Numbers Directory 2026: Verified Numbers for SS-4, 5472, and 7004
• How to Apply for an EIN by Fax (Form SS-4 Guide)
• How to File Form 5472 by Fax for Foreign-Owned US LLCs
• Form 7004 Extension for Form 5472: How to Fax the IRS
• Can You Fax a Tax Return to the IRS?
• International → US Faxing Guide

Disclaimer: SingleFax provides document transmission services and guided document workflows. SingleFax is not a certified public accounting firm or law firm, and this guide is not tax, legal, or accounting advice. Confirm current agency instructions and consult a qualified adviser for your filing.