Montana Form AB-8 is the Application for Separate Assessment of Undivided Interest in Mining Claim Property. This form allows owners of undivided interests in mining claim properties to request that their individual interests be assessed separately for tax purposes. By completing this form, each co-owner of a mining claim property can ensure that taxes are billed directly to them based on their share of the property rather than the entire parcel being assessed as a whole. This application must be filed by all undivided interest owners, and it requires that certain conditions be met, such as the property being a mining claim and the undivided interests existing before a specific date. If the application is approved, the taxes for each owner will be calculated and billed individually.
How To File Montana Form AB-8
To file Montana Form AB-8, all undivided interest owners in the mining claim property must complete the form. This includes providing details about the property, the undivided interests, and each co-owner’s share. The completed form must be submitted to the relevant county authorities, where the property is located. Ensure that all required information is accurately provided, such as the legal description of the property, the percentage of each co-owner’s undivided interest, and the correct mailing addresses for each co-owner. If there are more co-owners than space allows, an addendum to the application can be used to include additional information.

How To Complete Montana Form AB-8: Line-By-Line Instructions
Section 1: Property Information
- Mining Claim Property Description
Enter the description of the mining claim property as it is listed on the current property tax roll. Include the legal description of the property. - Assessment Code for Entire Parcel
Enter the assessment code for the entire parcel of property. - Geocode for Entire Parcel
Enter the geocode for the entire parcel of property. This code helps to identify the property in the county’s tax system. - Legal Description
Provide the full legal description of the mining claim property. This should be the same as the description found on the property’s tax roll.
Section 2: Co-Owner Information
- Co-Owner Information (Percent of Undivided Interest)
Enter the name, signature, mailing address, city, state, and ZIP code for each co-owner, along with their percentage of undivided interest in the mining claim property. The form provides space for multiple co-owners. - Signature of Co-Owner
The co-owner must sign the form to affirm that the information provided is correct. - Printed Legal Name
Enter the printed legal name of the co-owner as it appears on official documents. - Mailing Address, City, State, ZIP
Provide the complete mailing address of the co-owner. - Percent of Undivided Interest
Enter the percentage of the undivided interest held by each co-owner in the property. Ensure the total percentage of undivided interests adds up to 100%. If the total does not equal 100%, the remaining percentage will be assessed to “Unknown Owners,” as per Montana law.
Addendum for Additional Co-Owners
- Additional Co-Owners
If there are more than one co-owner, use the addendum section of the form to list additional owners, their interest percentage, and required information. Each co-owner’s signature, legal name, and mailing address should be included on the addendum.
Section 3: Certification
- Affirmation of Information
The undersigned applicants must affirm that the information provided in the application is true and correct.
Section 4: Department Use
- Assessment Code and Geocode
These fields are to be filled out by the department for internal use only once the application has been reviewed. - County Information
Enter the name of the county where the property is located for departmental reference.
