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IRS Form 8821 (Tax Information Authorization)

Fax Form 8821 so the IRS can discuss your tax information with someone you name. Routing matches Form 2848: use the CAF fax number for your state of residence.

Prefer the IRS online upload when you can. If you fax, use a handwritten signature and the number from the current Form 8821 instructions.

What to include

Use a handwritten signature, and the CAF number for your state of residence, the same routing as Form 2848. The IRS prefers the online upload when you can use it.

For the cover sheet, see the tax documents FAQ.

Fax numbers

Always re-check the source before a deadline. Agencies change fax numbers without notice.