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Quick answer: There is no single IRS fax number — the right one depends on the form and, for several forms, on your state. The IRS accepts many forms by fax (SS-4, 2553, 2848, 8821, 4506-T, 4506-C, and more) but not tax returns like the 1040. The table below has the verified numbers by form, each linking to a full guide. Whatever you send, keep the fax confirmation as your proof of the date.
Faxing is still one of the most reliable ways to get a signed form to the IRS — it gives you a timestamped transmission record, which matters when a deadline or a dispute is on the line. The hard part is that the IRS spreads its fax numbers across dozens of units, so the number that works for one form will be ignored for another. This page pulls the common ones together, answers whether a given document can be faxed at all, and shows how to send it.
Can you fax the IRS?
Yes — for specific forms, and for responding when the IRS contacts you. The IRS accepts a defined set of elections, authorisations, and transcript requests by fax, each routed to the unit that handles it. It does not accept tax returns by fax: a Form 1040, 1040-X, 941, or 1120 sent to a fax line is discarded without notice, so those must be e-filed or mailed (see can you fax your tax return). The other time fax applies is when a notice or audit letter asks you to respond — you fax your documents to the number printed on that letter, not a general one.
IRS fax numbers by form
Verified numbers for the most-faxed IRS forms. Several route by state — the linked guide has the full breakdown.
| Form | What it’s for | Fax number(s) |
|---|---|---|
| Form SS-4EIN application | Apply for an Employer Identification Number | 855-641-6935 (50 states & DC); 855-215-1627 (US territories); 304-707-9471 (outside the US) |
| Form 2553S-corp election | Elect S-corporation tax treatment | 855-887-7734 or 855-214-7520 — by state |
| Form 2848Power of attorney | Authorise someone to represent you | 855-214-7519, 855-214-7522, or 855-772-3156 — by state (304-707-9785 outside the US) |
| Form 8821Tax info authorisation | Let a third party view your tax info | 855-214-7519, 855-214-7522 or 855-772-3156 — by state (the same CAF units as Form 2848) |
| Form 4506-TTranscript request | Request a free tax transcript | 855-587-9604, 855-298-1145, or 855-821-0094 — by state and transcript type |
| Form 4506-CIVES request | Lender transcript pull through IVES | 844-249-6238, 844-249-8128, or 844-249-8129 — by your assigned IVES campus |
| Form 8806Fax-only | Information return for acquisition of control | 844-249-6232 — fax is the only accepted method (the IRS no longer takes it by mail) |
| Form 3911Refund trace | Trace a missing, lost, or stolen refund | By state — 8 regional Refund Inquiry Units (855-578-2550 / 855-307-3124 for businesses). See guide |
| Form 911Taxpayer Advocate | Ask the Taxpayer Advocate Service for help with a stuck IRS problem | 855-828-2723 (1-304-707-9793 from outside the US) |
| Form 8802US residency certification | Get Form 6166 to claim treaty benefits abroad | 877-824-9110 (inside the US) or 304-707-9792 — only after paying the user fee on Pay.gov |
| Tax returns1040 / 1040-X / 941 / 1120 | File your annual taxes | Not faxable — e-file or mail |
IRS fax numbers for businesses and tax professionals
Forms sent by employers, payroll providers, advisers and companies rather than individuals. Each links to a full guide.
| Form | What it’s for | Fax number(s) |
|---|---|---|
| Form 637Excise tax registration | Register for certain excise tax activities, mostly fuel | 855-887-7735 — Excise Operations Unit, Cincinnati |
| Form 3115Change in accounting method | Duplicate copy of an automatic change, or a non-automatic request | 844-249-8134 (automatic, duplicate copy) or 877-773-4950 (non-automatic, secure) |
| Form 8023Section 338 election | Elect section 338 treatment for a target after a qualified stock purchase | 844-253-9765 — up to 100 pages; due by the 15th day of the 9th month after the acquisition date |
| Form 8233Nonresident withholding exemption | Treaty exemption from withholding on a nonresident’s pay; sent by the withholding agent | 267-941-1365 — up to 25 pages per fax, within 5 days of accepting it |
| Form 8655Reporting agent authorisation | Let a payroll provider file employment tax returns and make deposits | 855-214-7523 — no more than 25 forms per fax |
| Form 8886Reportable transaction disclosure | The exact copy of an initial-year disclosure, for the Office of Tax Shelter Analysis | 844-253-2553 — initial filings only; not for general use |
| Form 8918Material advisor disclosure | Disclosure by an adviser on a reportable transaction | 1-844-253-5607 — Form 8918 only, up to 100 pages |
IRS fax numbers change, and there is no universal one. If the form isn’t in this table, the number is on that form’s IRS instructions or on the notice you received — and either way, confirm it on IRS.gov the same day you send. Faxing the wrong unit means your document isn’t processed.
What you can’t fax to the IRS
Not everything has a fax route, and sending these to a fax line just delays you — some are discarded without any notice. File the following by e-file or mail instead:
- Tax returns — 1040, 1040-X, 941, 1120. A return faxed to a general line isn’t processed (more on why).
- Form 8832 (entity classification election) — mail only; there is no 8832 fax number, whatever other sites may list.
- Extensions — Form 4868 (personal) and similar go by e-file or mail, not fax.
- Form 8822 (change of address) — mail only.
- Form 4506 (a full copy of a past return) — mail only, with a $30 fee for each return. If a transcript will do, Form 4506-T is free and can be faxed.
IRS Fax Finder
Pick your form and we’ll show the right fax number, what to do, and where it’s not faxable at all.
Verified against IRS sources. Fax numbers change — always confirm on the form’s IRS.gov instructions or on your notice before sending. This tool is general information, not tax advice.
Responding to an IRS notice
If the IRS has written to you — a CP2000, CP3219A, or audit letter — the fax number you need is printed on that notice, usually near the top. It routes to the department handling your case, so use it rather than any general form number. If the notice doesn’t show one, call 800-829-1040 and ask for the right number before sending.
Letter 12C works the same way. It asks for information the IRS needs before it can finish processing your return, and the IRS publishes no general fax number for replies, so use the contact details on the letter and reply within the 20 days it gives. Don’t send an amended return (Form 1040-X) in reply. For a CP05A notice, the IRS says replying through the Document Upload Tool is fastest; if you fax, use the number printed on the notice.
For many notices there’s now an alternative: the IRS Document Upload Tool (irs.gov/upload) lets you send your response online and gives you an automatic confirmation — something a fax can’t. Check whether your notice lists the upload option; if it does, it’s often the cleaner route. For forms that must be faxed, like an SS-4 for a quick EIN, fax is still the way.
How to fax a form to the IRS
- Complete and sign the form. Fill every required field; several forms (like 2848 and 8821) need a handwritten signature to be accepted by fax.
- Pick the right number for your form and state from the table above — or the number on your IRS notice if you’re responding to one.
- Add a cover sheet with your name, the form number, your callback number, the tax year, and the page count. Our cover sheet templates handle this, and a 4506-C IVES batch needs its specific approved cover sheet.
- Send it in one transmission and keep the confirmation. The report — number, timestamp, page count — is your proof of the date you filed; the IRS won’t send its own receipt.
Put only the last four digits of your SSN on the cover sheet — never the full number. Cover sheets sit on top of the stack at the receiving end where anyone nearby can read them; your full SSN belongs only on the form itself, inside the transmission.
No fax machine required: Municorn Fax sends your form and cover sheet to any IRS number straight from your phone or computer, with a delivery confirmation to keep on file.
A note on timing: the fax arrives instantly, but processing doesn’t. An SS-4 EIN usually comes back by fax in about four business days; CAF authorisations (2848/8821) post in a few business days; a 2553 acceptance notice (CP261) can take around 60 days; and a 4506-T transcript up to about 10 business days. Everything runs longer during the January–April crunch.
Is there one IRS fax number?
Can you fax the IRS?
Can you fax a tax return (Form 1040)?
How do I know the IRS received my fax?
Do I need a fax cover sheet?
Can I fax the IRS without a fax machine?
Form-by-form guides
- Fax Form SS-4 to the IRS for an EIN — and what to do if you hit EIN Reference Number 101.
- Fax Form 2553 for an S-corp election, including late-election relief.
- Fax Form 2848 (and 8821) — CAF unit numbers by state.
- Fax Form 8821 to let someone see your tax records without representing you.
- Fax Form 4506-T to request a transcript, and Form 4506-C for IVES requests.
- Fax Form 3911 to trace a missing refund — the fax number for your state.
- Fax Form 911 to ask the Taxpayer Advocate Service for help when the IRS hasn't resolved a problem.
- Fax Form 8802 for a US residency certificate (Form 6166) — and pay the fee first.
- Fax Form 8233 as a withholding agent claiming a nonresident’s treaty exemption.
- Fax Form 3115 for an accounting method change — which of its two numbers to use.
- Fax Form 8655 to authorise a payroll provider as your reporting agent.
- Fax Form 8886 to OTSA for an initial-year reportable transaction disclosure.
- Fax Form 8918 as a material adviser disclosing a reportable transaction.
- Fax Form 8023 to make a section 338 election, and the deadline that goes with it.
- Fax Form 637 to register for excise tax activities.
- Can you fax your tax return? — why returns go by e-file or mail instead.
Sources and IRS references
- Where to File Form SS-4 — EIN fax numbers. irs.gov
- Where to File Form 2553 — S-corp election fax numbers by state. irs.gov
- Where to File Form 2848 — CAF unit fax numbers. irs.gov
- Instructions for Form 8821 — CAF unit fax numbers and signature rules. irs.gov
- Instructions for Form 8802 — fax numbers, the e-payment rule and timing. irs.gov
- Instructions for Form 8233 — the fax number, the 25-page limit and the withholding agent’s duties. irs.gov
- Instructions for Form 3115 — both fax numbers, the timing window and signatures. irs.gov
- Form 8655 — the RAF team fax number and the 25-form limit. irs.gov
- Instructions for Form 8886 — the OTSA fax number and what it accepts. irs.gov
- Instructions for Form 8918 — the OTSA fax number, cover sheet rules and the 100-page limit. irs.gov
- Instructions for Form 8023 — the fax number, the 100-page limit and the deadline. irs.gov
- Form 637 and the 637 Registration Program — the fax number and what the review involves. irs.gov
- Where to File Form 4506-T and IVES faxing for participants (4506-C). irs.gov
- Form 911 (Rev. 6-2026) — Taxpayer Advocate Service fax, email and mail routes. irs.gov
