Use this form to request an informal review of your property. The informal review process invites you to explain why you believe our classification or value of your property is incorrect and allows us to address your concerns.
The Request for Informal Classification and Appraisal Review (Form AB-26) must be submitted within 30 days from the date on your classification and appraisal notice.
The department will review your request. If we determine valuation adjustments are warranted, the adjustments will apply to tax years 2025 and 2026 .
If you miss the 30-day deadline, you have until June 1, 2026, to submit a request for informal review or appeal directly to your local county tax appeal board (CTAB). Please note, any valuation adjustments will apply only to Tax Year 2026 (not this year).
View step-by-step instructions for Montana State Single Sign-On Okta Account Setup.
For more detailed contact information, please visit DOR Field Office Contact Information by County.