Supplemental Assessment

Mont. Code Ann. § 15-8-204, under When Property Is Assessed.

Mont. Code Ann. § 15-8-204

When any personal property liable to taxation is brought into a county at any time after the first Monday of August and the property has not been assessed for that year, it must be listed and assessed the same as if it had been in the county at the time of the regular assessment, and the tax must be collected, as provided in this code, at any time.