Can you fax Form 3949-A to the IRS? No.
No. The IRS does not provide a fax number for Form 3949-A — the Information Referral must be mailed.
There is no IRS fax line for reporting suspected tax fraud on Form 3949-A. The IRS instructs you to complete the form and send it by mail to its processing center in Ogden, Utah. You may report anonymously, so you are not required to identify yourself on the form.
What Is Form 3949-A?
Form 3949-A, Information Referral, is the form individuals use to report suspected tax law violations by a person or a business to the IRS. Common reasons include unreported income, false exemptions or deductions, kickbacks, a business failing to withhold or pay taxes, or other tax evasion. The IRS reviews the information you provide to decide whether to investigate.
How to File Form 3949-A the Correct Way
Form 3949-A is a paper referral. Fill it out as completely as you can, then mail it to the IRS at the address below.
Mail the completed form to the IRS (the only filing method)
Print and complete Form 3949-A with as much detail as possible about the person or business and the suspected violation, then mail it to the IRS processing center.
Source: IRS.gov — Form 3949-A (PDF). Addresses and filing rules change — always confirm the current instructions on irs.gov before sending. Last verified: June 2026.
| Detail | Form 3949-A |
|---|---|
| Can you fax it to the IRS? | No |
| How to file | Mail only — IRS, PO Box 3801, Ogden, UT 84409 |
| Purpose | Report suspected tax fraud or tax law violations |
| Anonymous? | Yes — you are not required to identify yourself |
| Last verified | June 2026 |
Common Mistakes to Avoid
- •Trying to fax or email the form — the IRS only accepts Form 3949-A by mail
- •Leaving out key details (names, address, type of violation, tax years) that help the IRS evaluate the referral
- •Using Form 3949-A to report identity theft — use Form 14039 instead
- •Expecting a status update — the IRS does not share the outcome of a referral with the person who submitted it
Need to fax a form the IRS does accept?
Form 3949-A can't be faxed — but plenty of IRS forms can, like Form SS-4, Form 2848, and Form 8821. When you do need to send a fax to the IRS or your tax pro, FaxFlow lets you do it securely from your phone or computer with delivery confirmation. No fax machine required.
Frequently Asked Questions
Can I fax Form 3949-A to the IRS?
No — the IRS does not provide a fax number for Form 3949-A. Mail the completed Information Referral to Internal Revenue Service, PO Box 3801, Ogden, UT 84409, per irs.gov.
What is Form 3949-A used for?
Form 3949-A, Information Referral, is used to report suspected tax law violations — such as unreported income, false deductions, or a business not paying taxes — by a person or company to the IRS.
Can I report tax fraud anonymously?
Yes. The IRS does not require you to identify yourself on Form 3949-A. Providing your contact details is optional and only used if the IRS needs to follow up.
Will the IRS tell me what happened with my report?
No. Federal disclosure laws prevent the IRS from sharing the status or outcome of a referral with the person who submitted it.
Is Form 3949-A the right form for identity theft?
No. If you are a victim of tax-related identity theft, use Form 14039, Identity Theft Affidavit, instead of Form 3949-A.
⚠️ 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.