Mont. Code Ann. § 39-71-501
Definition of uninsured employer
39-71-501 . Definition of uninsured employer. For the purposes of 39-71-501 , 39-71-503 through 39-71-511 , 39-71-515 through 39-71-520 , and 39-71-541 , "uninsured employer" means an employer who has not properly complied with the provisions of 39-71-401 .