Quick answer: you can fax some IRS documents, but not everything
The IRS does not have one universal fax number, and you usually should not fax a full tax return unless the IRS instructions, an IRS notice, or an IRS employee specifically tells you to. Fax is used for specific forms, authorizations, business filings, and notice responses where the IRS provides a fax route.
The safest rule is simple: use the fax number printed in the current IRS form instructions, the IRS notice or letter you received, or the page for the exact IRS tool you are using. If a third-party article lists a fax number, treat it as a starting point only and verify it on IRS.gov before sending.
| Situation | Can it usually be faxed? | What to check first |
|---|---|---|
| Form SS-4 for an EIN | Yes, fax is an IRS-listed option | Use the SS-4 filing location based on legal residence or principal business location. |
| Form 2553 S-Corp election | Yes, IRS instructions list fax routes | Use the state-based IRS service center in the current Form 2553 instructions. |
| Forms 2848 or 8821 | Yes, but online submission may be faster for many tax pros | Use the CAF chart or the IRS employee handling the matter. |
| Response to an IRS notice | Sometimes | Use the notice instructions, Document Upload Tool instructions, or the fax number shown on the letter. |
| Full individual tax return | Usually no | E-file or mail unless IRS instructions say otherwise. |
Common IRS forms people fax
MetroFax-style guides often stop at a short list of forms. The better approach is to understand the routing rule for each document, because the same IRS department can use different numbers depending on form type, state, territory, or whether the taxpayer is outside the United States.
These are common examples where IRS instructions currently include fax as a submission path. Always check the latest IRS page before sending because several IRS instructions warn that numbers can change without notice.
- Form SS-4, Application for Employer Identification Number (EIN).
- Form 2553, Election by a Small Business Corporation.
- Form 2848, Power of Attorney and Declaration of Representative.
- Form 8821, Tax Information Authorization.
- IRS notice responses when the notice or IRS Document Upload Tool instructions allow a fax or upload response.
- Case-specific documents requested by an IRS employee, auditor, or revenue officer.
IRS fax numbers for Form SS-4 (EIN application)
Form SS-4 is one of the clearest IRS fax use cases. The IRS says applicants can receive an EIN by fax, generally within 4 business days, under the Fax-TIN program. The number depends on where the applicant's legal residence, principal place of business, principal office, or agency is located.
If you fax Form SS-4, include the applicant's fax number on the form so the IRS can fax the EIN back. IRS instructions also say to use only one EIN application method for each entity so you do not receive more than one EIN.
| Applicant location | IRS fax number | Use this for |
|---|---|---|
| One of the 50 states or District of Columbia | 855-641-6935 | Domestic SS-4 EIN applications. |
| No legal residence, principal place of business, principal office, or agency in any state - sending from within the U.S. | 855-215-1627 | SS-4 applications routed to EIN International Operation from inside the U.S. |
| No legal residence, principal place of business, principal office, or agency in any state - sending from outside the U.S. | 304-707-9471 | SS-4 applications routed to EIN International Operation from outside the U.S. |
IRS fax numbers for Form 2553 (S-Corp election)
Form 2553 is deadline-sensitive, so routing matters. Current IRS instructions say to send the original election or fax it to the service center listed for the corporation's principal business, office, or agency. If the corporation files by fax, it should keep the original Form 2553 with its permanent records.
As of this update, the IRS instructions divide Form 2553 fax routing into two state groups. Because late-election relief and filing rules can be more complex, verify the current instructions before sending.
| Principal business location | IRS fax number |
|---|---|
| CT, DE, DC, GA, IL, IN, KY, ME, MD, MA, MI, NH, NJ, NY, NC, OH, PA, RI, SC, TN, VT, VA, WV, WI | 855-887-7734 |
| AL, AK, AZ, AR, CA, CO, FL, HI, ID, IA, KS, LA, MN, MS, MO, MT, NE, NV, NM, ND, OK, OR, SD, TX, UT, WA, WY | 855-214-7520 |
IRS fax numbers for Forms 2848 and 8821
Forms 2848 and 8821 are commonly used when a CPA, tax attorney, enrolled agent, or other authorized person needs to represent you or receive tax information. The IRS also offers online submission for these forms, and the IRS says electronic signatures for Forms 2848 and 8821 must be submitted online rather than by fax or mail.
If you fax Form 2848 or 8821, use the current Where To File chart unless line 4 says the authorization is for a specific use handled by a particular IRS office. In that case, mail or fax the form to the IRS office handling the matter.
| Taxpayer location | Form 2848 fax | Form 8821 fax |
|---|---|---|
| AL, AR, CT, DE, DC, FL, GA, IL, IN, KY, LA, ME, MD, MA, MI, MS, NH, NJ, NY, NC, OH, PA, RI, SC, TN, VT, VA, WV | 855-214-7519 | 855-214-7519 |
| AK, AZ, CA, CO, HI, ID, IA, KS, MN, MO, MT, NE, NV, NM, ND, OK, OR, SD, TX, UT, WA, WI, WY | 855-214-7522 | 855-214-7522 |
| APO/FPO, U.S. territories, foreign country, or otherwise outside the United States | 855-772-3156, or 304-707-9785 from outside the U.S. | Check the current Form 8821 instructions for international routing. |
How to fax IRS documents online in 7 steps
You do not need a physical fax machine to send IRS paperwork. The important work happens before you press send: confirm that fax is allowed for your document, prepare one clean PDF, and use the correct IRS routing number.
With 1Fax, you can upload the prepared PDF, enter the verified IRS fax number, send from your browser, and keep delivery status for your records.
- Open the current IRS instructions for your exact form or notice.
- Confirm fax is an allowed submission method for that document.
- Complete every required field and use a wet ink signature where fax or mail instructions require one.
- Put the cover sheet or IRS barcode page first if the notice or form instructions require it.
- Scan or save the packet as one clean PDF in the order the IRS should review it.
- Enter the verified IRS fax number exactly, including area code.
- Send the fax and save the delivery confirmation, page count, timestamp, and destination number.
What to put on an IRS fax cover sheet
A cover sheet is not always required, and some IRS notices include a barcode page or response form that should stay first. When a cover sheet is appropriate, keep it short and factual. The goal is routing, not argument.
Do not add more personal information than needed, but make sure the IRS can match the fax to the right taxpayer, entity, notice, or case.
| Cover sheet field | What to include |
|---|---|
| To | IRS office, unit, employee name, or attention line if provided. |
| From | Taxpayer, business, representative, or sender name. |
| Identifier | EIN, SSN/ITIN last four digits, notice number, tax year, case number, or form name as appropriate. |
| Contact | Phone number and mailing address or representative contact information. |
| Page count | Total pages including cover sheet and attachments. |
| Subject | Short description such as Form SS-4 EIN application, Form 2553 election, or response to CP notice. |
Mistakes that cause IRS fax delays
Most IRS fax problems are not caused by the fax technology. They happen because the packet is incomplete, routed to the wrong number, signed the wrong way, or missing the identifiers the IRS uses to match documents to a file.
Before sending, do a final check against the current IRS instructions and the notice or letter in front of you.
- Using a generic IRS fax number instead of the form-specific or notice-specific number.
- Faxing a document that must be e-filed, uploaded, or mailed instead.
- Submitting an electronic signature by fax when the IRS requires online submission for that signature type.
- Leaving out the notice number, tax year, EIN, SSN/ITIN, or representative information needed for routing.
- Sending separate attachments instead of one complete packet when the IRS instructions ask for one file or one submission.
- Forgetting to keep confirmation proof, especially for deadline-sensitive filings like Form 2553.
Fax vs IRS Document Upload Tool vs mail
Fax is not always the best IRS submission method. The IRS Document Upload Tool can be used to respond to certain IRS notices or letters, and the IRS says it accepts scans, photos, or digital copies as JPG, PNG, or PDF. The tool is not for submitting tax returns.
Use the method the IRS instructions give you. If a notice provides an upload path, that may be cleaner. If the form instructions list a fax number and your deadline is close, fax can be faster than mail. If the instructions require original documents or a mailed packet, follow that route.
| Method | Best for | Watch out for |
|---|---|---|
| Fax | Form-specific filings, authorizations, EIN applications, and deadline-sensitive responses where IRS lists fax as an option. | You must use the right IRS fax number and keep confirmation proof. |
| IRS Document Upload Tool | Responding to eligible IRS notices or letters when you have an access code or notice/letter details. | Do not use it for tax returns; choosing the wrong notice type can cause delays. |
| Returns, original documents, or packets where IRS instructions require mail. | Mail can take longer, so use tracking when timing matters. |
Research sources checked
This article was updated from official IRS pages checked on May 1, 2026, plus a review of the competing MetroFax article. IRS fax numbers and procedures can change, so verify the official IRS page for your exact form before sending.
- IRS Form SS-4 filing locations: https://www.irs.gov/filing/where-to-file-your-taxes-for-form-ss-4
- IRS Instructions for Form SS-4: https://www.irs.gov/instructions/iss4
- IRS Instructions for Form 2553: https://www.irs.gov/instructions/i2553
- IRS Instructions for Form 2848: https://www.irs.gov/instructions/i2848
- IRS Instructions for Form 8821: https://www.irs.gov/instructions/i8821
- IRS Submit Forms 2848 and 8821 online: https://www.irs.gov/tax-professionals/submit-forms-2848-and-8821-online
- IRS Document Upload Tool: https://www.irs.gov/help/irs-document-upload-tool
- MetroFax comparison article: https://www.metrofax.com/blog/fax-documents-irs
How 1Fax fits an IRS fax workflow
1Fax is built for one-time outbound faxes, which is exactly how many IRS fax tasks happen. You do not need a fax machine, landline, or monthly fax subscription. Prepare the IRS packet, upload it, enter the verified IRS fax number, and send.
For eligible domestic sends, the first page is free, a two-page fax is $1, and extra domestic pages are $0.50 each. Delivery status and email updates help you keep a record of the attempt.