How to Report Suspected Tax Fraud in Montana


We are committed to the fair administration of the tax laws of this state. This means taxpayers should pay no more and no less than they owe the state of Montana.

We recognize that most taxpayers are honest and pay their fair share for the services they receive from the state. Unfortunately, some individuals and businesses evade paying the taxes they owe. This is fraud, and it is illegal.

We need your help to find and stop this activity. We appreciate any information or tips that uncover tax fraud.

You can report suspected tax fraud using the Suspected Tax Fraud Information Referral (Form STFIR).


Reporting by Phone

This call is confidential.

Call Center: (406) 444-6900

TDD: Montana Relay dial 711


Reporting by Fax

You can fax Form STFIR to us at (406) 444-6642.


Reporting by Mail:

Mail Form STFIR to:

Montana Department of Revenue
Attn: Compliance Unit
PO Box 7149
Helena, MT 59604-7149

When reporting suspected fraud, please provide as much specific detail as possible. This could include:

  • The name and address of the person or business
  • Individual/business address and phone number
  • Marital status
  • Spouse’s name
  • Alleged tax violation
  • The date or time period of the potential fraud
  • How you became aware of the alleged violation
  • Asset information (vehicles, property, etc.)
  • Copies of any documents relating to the activities you are reporting (this is helpful when we review your complaint)
  • Your contact information (optional)

Use Form STFIR to provide these details.

We review the information provided along with our records to see what actions we need to take.

Since taxpayer records, including investigations, are confidential, we won't be able to tell you any other steps we take. However, we might contact you if we need additional information for our investigation.

We may also share information with the IRS.

Important Note About Federal Tax Fraud: 
We can't help with federal tax fraud. You will need to contact the IRS. Learn more on the IRS's How Do You Report Suspected Tax Fraud Activity?