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Taxes

How to File Taxes by Fax: Step-by-Step Guide

By
Alexander Harmsen
Alexander Harmsen is the Co-founder and CEO of PortfolioPilot. With a track record of building AI-driven products that have scaled globally, he brings deep expertise in finance, technology, and strategy to create content that is both data-driven and actionable.
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PortfolioPilot Compliance Team
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How to File Taxes by Fax: Step-by-Step Guide

Filing taxes can feel like a bit of a headache, right? Especially when you’re trying to figure out the best and fastest way to get everything sent in. While most people stick to electronic filing or mailing their forms, there are some situations where faxing might actually be your best bet. We know, faxing sounds kind of old-school, but in some cases, it’s surprisingly quick and efficient. Let me break it all down for you, step by step, so it feels totally doable.

Key Takeaways

  • Filing taxes by fax is typically used for specific forms or when requested by the IRS.
  • Always double-check that you’re using the correct fax number to avoid delays or errors.
  • Keeping a fax confirmation page is critical—it’s your proof of submission.

When Should You File Taxes by Fax?

Filing taxes by fax isn’t super common these days, but there are a few times when it’s actually the way to go. Here’s when faxing makes sense:

  1. When the IRS Asks for It: Sometimes, the IRS might request specific forms, like Form 3115 (Application for Change in Accounting Method) or Form 433-A (Collection Information Statement for Wage Earners). In those cases, they’ll give you a fax number to send everything over.
  2. For Fixing Mistakes or Adjustments: If you’re filing an amended return or need to correct something, faxing can be part of the process.
  3. When It’s Urgent: If you’re on a tight timeline, faxing can be much faster than mailing your forms.

Hypothetical Example: Let’s say you get a letter from the IRS asking for extra documentation to verify your income. The letter includes a fax number for sending those forms. By faxing them, you can speed up the process and potentially avoid delays in resolving your case.

Step-by-Step Guide to Filing Taxes by Fax

Here’s how to get it done without any stress:

Step 1: Gather What You Need

Before you start, make sure you’ve got everything ready to go. This might include:

  • The tax forms you’re filing (like Form 1040 or Form 941).
  • Any supporting documents, like receipts or other forms the IRS needs.
  • The IRS letter or notice, if they sent you one, with instructions and their fax number.

Step 2: Double-Check the IRS Fax Number

Using the wrong fax number could mean delays—or worse, your documents might get lost. Double-check the fax number by:

  • Looking at the IRS letter you received.
  • Visiting the official IRS website to confirm the number.
  • Calling the IRS directly if you’re unsure.

Step 3: Add a Cover Sheet

A cover sheet is like a guide for your fax—it helps ensure your documents end up in the right hands. Your cover sheet should include:

Here’s an example of a simple cover sheet:

[Your Name]  

[Your Address]  

[Your Phone Number]  

Social Security Number: XXX-XX-XXXX  

Date: [Insert Date]  

Number of Pages: [Insert Total]  

Purpose: Submission of Form [Insert Form Number] as Requested by IRS 

Step 4: Use a Reliable Fax Machine or Online Service

You can either use a traditional fax machine or an online fax service. Online faxing is super convenient and lets you send documents directly from your computer or smartphone.

Popular online fax services include:

Step 5: Send the Fax and Keep the Confirmation

Now it’s time to send your fax. Once it’s done, double-check everything:

  • Save the Confirmation Page: This is like your receipt—it’s proof the IRS got your documents.
  • Check for Errors: Look over the confirmation to make sure every page went through and nothing got cut off.

Step 6: Follow Up with the IRS

Once you’ve sent your fax, it’s smart to confirm that the IRS received everything. Here’s how you can follow up:

  • Call the IRS: Use the contact number provided in the letter or visit their website to find the appropriate hotline.
  • Check Your IRS Online Account: If you’ve set up an account with the IRS, you can log in to see updates on your submission status or confirm receipt of your documents.
  • Save Extra Documentation: Keep your fax confirmation page handy in case you need to reference it during your follow-up.

Best Practices for Filing Taxes by Fax

  • Keep Copies: Always save copies of the documents you fax, just in case you need to resend them.
  • Send During Business Hours: Sending your fax during IRS business hours can help ensure it gets processed faster.
  • Ensure Legibility: Make sure your documents are clear and easy to read before faxing.

IRS Fax Filing FAQs

When does the IRS typically require taxpayers to file forms by fax?

Faxing is usually reserved for specific situations, such as when the IRS requests forms like Form 3115 or Form 433-A, or when supporting documentation is needed for verification or adjustments.

How does faxing compare to mailing tax forms in terms of speed?

Faxing can be faster than mailing, especially when deadlines are tight or urgent documentation is requested. The transmission occurs immediately, potentially avoiding delays in postal delivery.

What proof should taxpayers retain after sending forms by fax?

Taxpayers should keep the fax confirmation page, which serves as a receipt verifying the IRS received the transmission. This record may be required for audits or follow-ups.

What details must be included on a fax cover sheet to the IRS?

A proper cover sheet should list the sender’s name, address, phone number, Social Security Number or EIN, the purpose of the fax, and the total number of pages sent.

What risks come from using the wrong IRS fax number?

Using an incorrect number can lead to delays, lost documents, or failure to meet deadlines. Taxpayers are advised to verify numbers through IRS letters, the official website, or direct phone contact.

What types of tax forms are commonly faxed to the IRS?

Forms often faxed include adjustments or special requests, such as amended returns or applications for accounting method changes, when specified by the IRS.

How should taxpayers follow up after faxing documents to the IRS?

Follow-up can include calling the IRS using the number provided in their correspondence or checking an online IRS account to confirm receipt and track processing.

Why are online fax services often recommended over physical machines?

Online services allow users to fax directly from computers or smartphones, offering convenience and reliability. Popular services include eFax, MyFax, and Fax.Plus.

What precautions ensure IRS faxes are processed correctly?

Sending during IRS business hours, using legible documents, and saving both the confirmation page and copies of all forms can reduce errors and improve processing speed.

Can faxing be used to resolve IRS disputes more quickly?

Faxing requested documents in response to IRS notices may expedite case resolution by providing immediate delivery, reducing the risk of postal delays.

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1: As of February 20, 2025