Mont. Code Ann. § 5-13-403

All money for audits transferred to the legislative auditor as provided in 5-13-402 must be deposited in the state special revenue fund in the state treasury to the credit of the office of the legislative auditor. The money deposited that is in excess of general and pay plan appropriations is statutorily appropriated, as provided in 17-7-502, and may be expended by the legislative auditor to pay expenses incurred in auditing state agencies pursuant to an operational plan approved by the legislative audit committee.