The short difference
Both forms are recorded by the IRS in its Centralized Authorization File (CAF), and both list the tax matters and years they cover. What they allow is different.
Form 2848, Power of Attorney. Your representative can speak and act for you: handle an audit, answer a notice, negotiate a payment plan, argue a penalty. They also get your confidential information for the matters listed. Only people eligible to practice before the IRS can be named, such as attorneys, CPAs, enrolled agents, or certain family members and officers. Your representative signs Part II of the form.
Form 8821, Tax Information Authorization. The person you name, called a designee, can inspect and receive your information, by phone, in person or in writing. They cannot speak for you, sign anything for you, argue your position or represent you. Anyone can be a designee: a bookkeeper, a relative, a company, a lender.
A simple test: if the other person needs to argue or agree to something with the IRS, file Form 2848. If they only need to know what the IRS has on file, file Form 8821.
When the return's Third Party Designee box is enough
Form 1040 and most business returns have a Third Party Designee area. If you check Yes and enter a name, phone number and a five-digit PIN the designee chooses, the IRS can talk to that person about the processing of that return. The designee can give the IRS missing information, ask about your refund or payments, receive copies of notices and transcripts about that return, and respond to certain notices about math errors, offsets and return preparation.
It is narrow. The designee cannot receive a refund check, bind you to anything or represent you. It ends automatically no later than the due date, not counting extensions, of the next year's return. For the 2025 return, that is April 15, 2027 for most people. For anything broader, or for other years, use Form 8821 or Form 2848.
The faster route: Tax Pro Account
If your representative is a tax professional, they can send the request from their IRS Tax Pro Account. You approve it in your own IRS Individual Online Account, under Authorizations, and it records in real time. No paper form is needed.
It has limits. It works only for individual taxpayers whose address is in a US state or D.C. and matches IRS records, and only for representatives authorized to practice. Businesses, foreign addresses and everyone else still use the paper forms.
How to file Form 2848 or 8821
You can submit either form online at IRS.gov/Submit2848 or IRS.gov/Submit8821 with an IRS Secure Access account, or by fax or mail to the CAF unit for your state. The fax numbers and addresses are in each form guide.
Two rules trip people up:
- Signatures. A form signed electronically, with a drawn or typed signature, is accepted only when you submit it online. A form sent by fax or mail needs a handwritten signature.
- Be specific. Name the type of tax, the form number and each year or period. The IRS returns a form that says "All years" or "All taxes", and it records future periods only up to 3 years after December 31 of the year it receives the form.
A new form for the same matters and years replaces earlier ones, unless you check the box to keep them and attach copies. Filing Form 2848 does not revoke a Form 8821.
For the line-by-line steps, read the Form 2848 guide or the Form 8821 guide. If you fill one on your phone in PDF Sign & Fill, your documents are never uploaded; you send the finished form yourself.
Frequently asked questions
What is a 2848 form used for?
Form 2848 is a power of attorney for IRS matters. It lets an eligible person, such as an attorney, CPA or enrolled agent, represent you before the IRS on the taxes and years you list, and receive your information for those matters.
Can my accountant use Form 8821 instead of 2848?
Yes, if they only need to see your records, for example to pull transcripts or check notices. If they need to talk to an examiner, negotiate or sign on your behalf, they need Form 2848, and they must be eligible to practice before the IRS.
Does Form 2848 or 8821 work with my state or my bank?
No. Both forms cover the IRS only. A state tax agency, a bank or a court asks for its own authorization.
How long does Form 8821 last?
The instructions set no end date. It covers the matters and years you list until you revoke it, or until a newer Form 8821 replaces it, unless you attach a copy to keep the earlier one. One exception: a Form 8821 filed for a purpose outside the IRS, such as income verification for a lender, must reach the IRS within 120 days of your signature.
Can my spouse be on the same Form 2848?
No. Each taxpayer files a separate Form 2848, even after a joint return.
The form guides
Sources
Written from: Instructions for Form 2848 (Rev. September 2021); Instructions for Form 8821 (Rev. September 2021); Tax Pro Account; Instructions for Form 1040 (2025), Third Party Designee.
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