Mont. Code Ann. § 15-31-541

The failure to do any act required by or under the provisions of this chapter shall be deemed an act committed in the office of the department of revenue in Helena, Montana. The certificates of the department to the effect that a tax has not been paid, that a return has not been filed, or that information has not been supplied as required by or under the provisions of this chapter shall be prima facie evidence that such tax has not been paid, that such return has not been filed, or that such information has not been supplied.