How to Fax Form 8821 (Tax Information Authorization) to the IRS

Form 8821, Tax Information Authorization, allows a third party — often a CPA, financial planner, or mortgage processor — to view your tax information without giving them the authority to represent you before the IRS. It's frequently faxed to the same CAF unit that handles Form 2848.

Before You Fax

• Form 8821 requires a handwritten signature when faxed — electronic signatures for this form go through the IRS's separate online submission tool instead
• Submit one form per taxpayer, even for joint filers
• If you're authorizing multiple designees, attach a list with their addresses and requested access, and check the corresponding box on line 2

How to Send It Online

1. Download and complete Form 8821 from irs.gov
2. Confirm the correct fax number from the current official instructions
3. Save your completed, signed form as a clean PDF
4. Upload it right here on LowFax using the Send a Fax button below, enter the verified fax number, and send
5. Keep your delivery confirmation as proof of submission

What Happens Next

Once received, the authorization is recorded to the CAF system, typically within a few business days. You can check status using the IRS's online tool for checking Form 2848 and 8821 processing.