Fill IRS Form 8821 online — free, in your browser
IRS Form 8821, Tax Information Authorization, lets a taxpayer authorize any person, firm, or organization to inspect or receive their confidential tax information — without granting the power to represent them (that's Form 2848). AttachKit opens the official blank PDF and fills it right in your browser: it auto-fills the taxpayer's name, taxpayer identification number, and daytime phone from a saved profile using on-device heuristics, then leaves the appointee details, the tax matters, and the signature for you to complete and review. Your PDF never leaves your device.
Your PDF never leaves your browser — open DevTools → Network and watch: the file is never uploaded.
Who needs it: Taxpayers who want to let a CPA, lender, or other party access their IRS account or transcripts — and the accountants and tax professionals who prepare Form 8821 for their clients. Use Form 2848 instead when you need someone to actually represent you before the IRS.
Need a blank Form 8821? Download from the source, then drop it in below.
Why fill it here
- Auto-fills the taxpayer's name, ID number, and phone from a saved profile, on-device — handy when you prepare 8821s for many clients.
- Runs 100% in your browser: the PDF never uploads, and any optional AI assist only ever sees field labels, never your document.
- Free to fill unlimited forms (10 signed PDFs/mo on the free tier); you complete and review the appointee + tax-matter rows yourself before signing.
Fill your Form 8821 now
Form 8821 questions, answered
General information, not legal or tax advice
This page is general information about a commonly-used tax form. Tax law is complex and fact-specific — for advice on your return, consult a CPA, enrolled agent, or tax attorney. AttachKit fills the PDF; the IRS holds you responsible for what's on it.
- What's the difference between Form 8821 and Form 2848?
- Form 8821 only authorizes someone to RECEIVE or inspect your tax information; Form 2848 (Power of Attorney) also lets them act and represent you before the IRS. Pick 8821 for access, 2848 for representation. This isn't tax advice — check the official instructions or a tax professional.
- Does AttachKit file Form 8821 with the IRS?
- No. AttachKit fills the PDF in your browser; you download it and submit it to the IRS yourself (by fax, mail, or online per the current Form 8821 instructions).
- Is it safe to put the taxpayer's SSN or EIN in my profile?
- Your SSN/EIN stays in your browser's localStorage and never syncs to our servers — even when you're signed in. AttachKit fills the ID box on-device, so it isn't sent to any third-party AI.
More forms: Form 941 · Form 1040 · Form 2553 · Form 2848 · Form 4868 · Browse all 65 forms →
Done filling? Also sign a PDF, convert PDF to Word, Word to PDF — or see AttachKit for accountants.
AttachKit is a private, independent tool for filling and signing PDFs on your own device. It is not a government agency, law firm, or filing service, and is not affiliated with or endorsed by the IRS, USCIS, the U.S. Department of State, or any government body. Forms are provided for convenience — always download the current version and instructions from the official .gov website, and your completed document never leaves your browser.