Affidavit of One and The Same (Form AOS)

You may use this form to declare various properties with different ownership or variations on ownership names are actually under the same ownership.

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Citizen Services Call Center

Phone: (406) 444-6900

TDD: Montana Relay 711

We’re available Monday through Thursday, 9:00 a.m. until 4:00 pm and Friday, 9:00 a.m. until 1:00 p.m.

Taxpayer Advocate

If you need help working with the department or figuring out our audit, appeals, or relief processes, the Taxpayer Advocate can help.

Mail: 125 N Roberts Street Helena, MT, 59601

Phone: (406) 444-6789

TDD: Montana Relay 711

Fax: (406) 444-3696