By Michael Chen · Published March 14, 2026 · Updated April 10, 2026 · 7 min read
If you need to authorize someone to view your IRS tax records — your accountant, a loan officer, a family member — Form 8821 (Tax Information Authorization) is the form you need. The tricky part is knowing which IRS fax number to use, since there are four different numbers depending on where you live.
This guide gives you every IRS Form 8821 fax number, step-by-step filing instructions, and the most common mistakes that cause rejections and delays.
IRS Fax Numbers for Form 8821 (2026)
The IRS routes Form 8821 to regional Centralized Authorization File (CAF) units. Use the fax number that matches the taxpayer's state of residence — not the designee's location.
| CAF Unit | Fax Number | States Covered |
|---|---|---|
| Eastern CAF Unit | 855-214-7519 | AL, AR, CT, DE, DC, FL, GA, IL, IN, KY, LA, ME, MD, MA, MI, MS, NH, NJ, NY, NC, OH, PA, RI, SC, TN, VT, VA, WV |
| Western CAF Unit | 855-214-7522 | AK, AZ, CA, CO, HI, ID, IA, KS, MN, MO, MT, NE, NV, NM, ND, OK, OR, SD, TX, UT, WA, WI, WY |
| International (from US) | 855-772-3156 | APO/FPO addresses, US territories |
| International (from outside US) | 304-707-9785 | Any foreign address |
Which number is right for me?
The number is determined by the taxpayer's home state or address — not by the tax professional or designee filing the form. If a California CPA is filing on behalf of a New York client, use the Eastern fax number (855-214-7519).
Mailing Addresses (If You Prefer Mail)
| CAF Unit | Address |
|---|---|
| Eastern | Internal Revenue Service, 5333 Getwell Road, Stop 8423, Memphis, TN 38118 |
| Western | Internal Revenue Service, 1973 Rulon White Blvd., MS 6737, Ogden, UT 84201 |
| International | Internal Revenue Service, International CAF Team, 2970 Market Street, MS 4-H14.123, Philadelphia, PA 19104 |
What Is IRS Form 8821?
IRS Form 8821 (Tax Information Authorization) lets any taxpayer authorize a third party to inspect and receive their confidential IRS tax information. It grants read-only access — the designee can view records, receive copies of IRS notices, and pull transcripts, but cannot represent the taxpayer or negotiate with the IRS.
Key facts about Form 8821:
- Anyone can be designated — no professional license required (unlike Form 2848, which requires attorneys, CPAs, or enrolled agents)
- No expiration date — stays active until you revoke it
- CAF number — the IRS assigns a 9-digit Centralized Authorization File number to your designee; write "NONE" if it's their first time filing
- Use case — commonly used for mortgage income verification, business loans, accountant reviews, and ongoing record monitoring
For a comparison of all IRS fax numbers across different forms and situations, see our complete IRS fax numbers guide.
How to Fax Form 8821 to the IRS
Download the Current Form
Get Form 8821 directly from irs.gov/pub/irs-pdf/f8821.pdf. Always use the current version — the IRS rejects outdated editions. As of 2026, look for the Rev. January 2021 version or newer.
Complete All Sections
Fill in the taxpayer information (Line 1), designee details (Line 2), specific tax types and years (Line 3), and any special handling notes (Lines 4–5). Every required field must be complete — partial forms are returned without processing.
Sign with a Wet Ink Signature
For fax or mail submissions, only a handwritten signature is accepted. Typed names, digital signatures, and e-sign stamps are invalid for fax/mail and will result in rejection. Joint filers must each sign a separate Form 8821.
Attach a Fax Cover Sheet
Include a cover sheet identifying the recipient (IRS CAF Unit), your fax number, the form number (8821), page count, and your contact details. Never put your full SSN on the cover sheet. Use our IRS fax cover sheet guide for a free template.
Fax to the Correct CAF Unit Number
Use the table above to find your number based on the taxpayer's state. Double-check the number before sending — faxing to the wrong unit causes misrouting and delays of weeks.
Save the Confirmation
Keep your fax transmission confirmation page. This is your proof of timely filing if the IRS claims non-receipt. Save a copy of the signed form as well.
Wait 10 Business Days
The IRS does not send a processing confirmation. Check the IRS processing status page for current timelines. Standard processing for faxed forms is approximately 10 business days.
Faster Alternative: Fax from Your Phone
Skip the physical fax machine. mFax lets you upload your signed Form 8821 PDF, enter the IRS fax number, and send — all from your phone in under 2 minutes. You get a delivery confirmation you can save as your proof of filing.
What Each Line of Form 8821 Requires
Line 1 — Taxpayer Information
- Full legal name (must match IRS records exactly)
- Mailing address
- Social Security Number or Employer Identification Number
- Daytime phone number
For married couples: Each spouse is a separate taxpayer and must file their own Form 8821 — even for a joint return. One form cannot cover both spouses.
Line 2 — Designee Information
- Designee's full name and mailing address
- Phone number and fax number
- CAF number — the 9-digit IRS identifier for the designee. If they have never filed before, write "NONE" and the IRS will assign one
- PTIN (Preparer Tax Identification Number) — only required if the designee is a paid tax preparer
- Optional checkbox: receive IRS notices and updated contact info
Line 3 — Tax Information (Most Critical)
Specify exactly:
- Type of tax — e.g., Income, Employment, Excise
- Form number(s) — e.g., Form 1040, Form 941, Form 720
- Year(s) or period(s) — must be specific years (e.g., "2022, 2023, 2024"). "All years" and "all periods" are not allowed and will cause rejection
- Future years: you may list up to 3 years after December 31 of the current filing year
Line 4 — Specific Use Not Recorded on CAF
Check this box if the authorization is for a single, one-time use — such as a loan application or background check. These authorizations are not recorded on the CAF and cannot be used for ongoing access.
Line 5 — Prior Authorizations
Filing a new Form 8821 automatically revokes all prior authorizations for the same tax matters and years. If you want to keep existing authorizations active, check this box and attach copies of the prior Form 8821s you want to retain.
Line 6 — Signature
Handwritten signature of the taxpayer and the current date. If the taxpayer is deceased, the executor or administrator must sign. Corporations must have an officer sign.
Form 8821 vs. Form 2848: Which Do You Need?
| Feature | Form 8821 | Form 2848 |
|---|---|---|
| Purpose | View/receive tax records | Full IRS representation |
| Can speak to IRS on your behalf | No | Yes |
| Can negotiate or sign agreements | No | Yes |
| Who qualifies as designee | Anyone | Licensed professionals only (attorney, CPA, EA) |
| Receives IRS notices | Yes (if checked) | Yes |
| Best for | Transcript pulls, loan verification, monitoring | Audits, collections, appeals, liens |
The typical workflow for tax professionals: Use Form 8821 first to pull transcripts and review the situation. If IRS representation is needed, file Form 2848 to establish Power of Attorney.
Online vs. Fax vs. Mail: Processing Time Comparison
| Method | Processing Time | Signature Type | Best For |
|---|---|---|---|
| IRS Tax Pro Account (online) | Real-time | Electronic | Fastest option, tax pros only |
| Fax | ~10 business days | Wet ink only | Most common, good paper trail |
| Several weeks | Wet ink only | Backup only |
The IRS Tax Pro Account at IRS.gov/Submit8821 provides real-time processing and accepts electronic signatures — it's the fastest method by far if you have access. Fax is the next best option for most filers, combining speed and a confirmation record.
120-Day Deadline for Loan Verification
If you're submitting Form 8821 for a non-IRS-dispute purpose — such as income verification for a mortgage or business loan — the IRS must receive the form within 120 days of the taxpayer's signature date. Submit as early as possible to avoid having to re-sign.
Common Mistakes That Cause Rejections and Delays
- ✓Wrong fax number — Using the Eastern fax number for a Western state (or vice versa) misroutes your form. Always verify the taxpayer's state before dialing.
- ✓Outdated form version — The IRS rejects old editions of Form 8821. Always download from IRS.gov on the day you file.
- ✓Vague tax periods — Writing "all years," "open years," or similar phrases is not accepted. List specific years: 2022, 2023, 2024.
- ✓Typed or digital signature on fax submissions — Electronic signatures are only valid for the online portal. Fax and mail require a wet ink signature.
- ✓Name or TIN mismatch — The taxpayer's name must exactly match IRS records. A minor discrepancy (abbreviation, maiden vs. married name) can cause rejection.
- ✓Both spouses not filing separately — Married taxpayers each need their own Form 8821, even if they file a joint tax return.
- ✓Inadvertent revocation — Filing a new Form 8821 automatically revokes prior ones for the same periods. Check Line 5 and attach prior forms if you want to keep them active.
- ✓No fax confirmation kept — Without a transmission confirmation, you have no proof of filing if the IRS later claims non-receipt.
After You File: What Happens Next
Once the IRS processes your Form 8821, your designee's CAF record is updated and they can begin requesting transcripts and receiving IRS correspondence on your behalf.
The IRS does not send a confirmation letter. You'll know processing is complete when your designee can successfully pull transcripts via the IRS e-Services Transcript Delivery System (TDS).
To revoke a Form 8821 at any time, write "REVOKE" across the top of a copy of the original form, sign and date it, and fax or mail it to the same CAF unit that received the original.
For a full breakdown of sending any IRS document by fax — including other forms and the correct fax numbers — see our guide to faxing IRS forms.
Send Your Form 8821 Now
Download Form 8821 from IRS.gov, sign it in ink, and fax it to the correct CAF unit number for your state. If you need a faster, more reliable way to send it, mFax lets you upload your signed PDF and fax it directly to the IRS — with a delivery receipt — from any phone or browser. No fax machine required.
For full IRS Power of Attorney (Form 2848) instructions, see our complete Form 2848 faxing guide.