Mont. Code Ann. § 41-4-102

Financial responsibility for any child placed pursuant to the provisions of the Interstate Compact on the Placement of Children must be determined in accordance with the provisions of Article V of that compact in the first instance. However, in the event of partial or complete default of performance under the compact, the provisions of Title 40, chapter 5, part 10 (Uniform Interstate Family Support Act), 41-3-446, and 52-2-611 also may be invoked.