Montana Title 39. Labor § 39-8-403. Workers' compensation insurer requirements

(1) An insurer that provides workers' compensation insurance to a professional employer organization shall base classifications and rates applicable to the payroll of a worker who is subject to either a professional employer arrangement or an employee leasing arrangement as though the worker has been a direct employee of the client employer. If an experience modification has been established for the client employer, that experience modification must be audited using the factors in subsection (3) and must be applied by the insurer to the premium for the client employer's workers.

(2) The insurer of a professional employer organization shall report to the workers' compensation advisory or rating organization of which the insurer is required to be a member under Title 33, chapter 16, part 10, all data by client, including payroll by classification and liabilities for each client during the term of the policy.

(3) An insurer shall audit policies issued to a professional employer organization within 90 days of the policy effective date and may conduct quarterly audits thereafter. The purpose of the audit is to determine whether all classifications, experience modification factors, and estimated payroll used with respect to the development of the premium charged are appropriate.

(4) All operations of a client, whether or not all or a portion of the client's operations are subject to a professional employer arrangement or employee leasing arrangement, must be insured by the same insurer.