At-a-Glance: Form 12203
Where to send Form 12203
Mail it to the IRS address on the letter that explains your appeal rights. There is no general public fax number for Form 12203 — routing depends on the IRS office that issued your letter.
Per IRS Appeals guidance: "Complete your protest and mail it to the IRS address on the letter that explains your appeal rights."
What Is Form 12203?
Form 12203, "Request for Appeals Review," is the IRS Small Case Request. You use it to ask the IRS Independent Office of Appeals to review an examination or other determination you disagree with, generally when the total amount for any tax period is $25,000 or less. If the disputed amount is larger, the IRS requires a formal written protest instead of Form 12203.
Where to Send Form 12203
There is no nationwide address and no general public fax number for Form 12203. The IRS instructs you to:
- •Mail it to the IRS address on the letter that explains your appeal rights. The letter that proposed the change tells you exactly where to send your request.
- •Fax only if your letter provides a fax number. There is no single public fax line; if your specific letter lists one, you may fax it instead.
- •Keep a copy of the completed form, your supporting documents, and proof of timely submission.
Direct from IRS Appeals
"Complete your protest and mail it to the IRS address on the letter that explains your appeal rights."
Source: IRS.gov — Preparing a Request for Appeals. Always verify against your own letter before sending. Last verified: June 2026.
| Detail | Form 12203 |
|---|---|
| Where to send | The IRS address on the letter that explains your appeal rights |
| Public fax number | None — fax only if your letter lists a number |
| When you can use it | Total amount of $25,000 or less for any tax period |
| Last verified | June 2026 |
How to Complete & Send Form 12203
Confirm you qualify for a Small Case Request
Check that the total amount for any tax period is $25,000 or less. If it is more, prepare a formal written protest instead.
List each disputed item
Enter each item from the IRS letter you disagree with and the reason you disagree. Copy the tax periods and item descriptions from the letter.
Sign and attach your support
Sign and date the form and attach copies of documents that back up your position. File by the deadline stated in your letter (often 30 days from its date).
Send it to the address on your letter
Mail it to the IRS address on the letter that explains your appeal rights (or fax it if your letter lists a fax number). Keep a copy and proof of submission.
Did your IRS letter list a fax number?
If the letter explaining your appeal rights provides a fax number, FaxFlow lets you fax Form 12203 from your phone or computer with delivery confirmation — no fax machine needed. There is no general public fax line for this form, so always use the number on your own letter.
Send a Fax OnlineFAQ Section
Can I fax Form 12203 to the IRS?
Only if the IRS notice you received lists a fax number — there is no single public fax line for Form 12203. The IRS instructs you to mail your request to the address on the letter that explains your appeal rights. Use a fax number only if your specific letter provides one; otherwise send it to the address on your letter (per irs.gov).
Where do I send Form 12203?
Mail or send Form 12203 to the IRS address shown on the letter that explains your appeal rights. There is no single nationwide address or general public fax number — routing depends on the IRS office that issued your letter.
When should I use Form 12203 instead of a formal written protest?
Form 12203 (Request for Appeals Review) is the Small Case Request. You can generally use it when the total amount for any tax period is $25,000 or less. If the amount is more than $25,000, the IRS requires a formal written protest instead of Form 12203.
What is the deadline to file Form 12203?
The deadline is stated in the letter that explains your appeal rights — typically you must respond within 30 days of the date on that letter. File on or before the date in your letter to preserve your appeal. Always follow the specific deadline printed on your own notice.
What should I include with Form 12203?
List each disputed item from the IRS letter and explain why you disagree with each one. Attach copies of any documents that support your position. Keep a copy of everything you send and, if a deadline applies, keep proof of timely submission such as a certified mail receipt or fax confirmation.
Need to send a tax document by fax?
When your IRS letter provides a fax number, FaxFlow sends it securely from any device with confirmation.
⚠️ Disclaimer
FaxFlow is not affiliated with or endorsed by the IRS. Fax numbers, addresses, and filing rules change often and may be outdated or incorrect here — always verify against the official IRS website (irs.gov) before sending. This page is for general information only and is not tax, legal, or financial advice; consult a qualified tax professional for your situation.