(1) Each circuit judge shall receive an annual salary payable by the state as calculated under this section and may receive from any county in which he or she regularly holds court an additional salary as determined from time to time by the county board of commissioners. In any county where an additional salary is granted, it shall be paid at the same rate to all circuit judges regularly holding court in that county.

  (2) Each circuit judge shall receive an annual salary calculated as follows:

  (a) An annual salary payable by the state that is the difference between 85% of the salary of a justice of the supreme court as of December 31, 2015 and $45,724.00.

  (b) In addition to the amount calculated under subdivision (a), a salary payable by the county or counties of the judicial circuit. The state shall reimburse to a county or counties paying an additional salary to a circuit judge $45,724.00, if the total additional salary, including any cost-of-living allowance, payable by that county or counties to a circuit judge is neither less than nor more than $45,724.00. If the county or counties pay a circuit judge less than or more than $45,724.00, the county or counties are not entitled to reimbursement from the state under this subsection.

  (c) In addition to the amounts under subdivisions (a) and (b), an amount payable by the state that is equal to the amounts calculated under subdivisions (a) and (b) multiplied by the compounded aggregate percentage pay increases, excluding lump-sum payments, paid to civil service nonexclusively represented employees classified as executives and administrators on or after January 1, 2016. The additional salary under this subdivision takes effect on the same date as the effective date of the pay increase paid to civil service nonexclusively represented employees classified as executives and administrators. The additional salary under this subdivision shall not be based on a pay increase paid to civil service nonexclusively represented employees classified as executives and administrators if the effective date of the increase was before January 1, 2016.

  (3) Each circuit judge who holds court in a county other than the county of his or her residence shall be reimbursed for his or her actual and necessary expenses incurred in holding court. Each circuit judge entitled to the reimbursement shall certify the expenses incurred to the court administrator for allowance. Upon allowance by the administrator, the state treasurer shall issue a warrant on the state treasury for payment.

  (4) A circuit judge whose case load is less than other circuit judges may be authorized by the supreme court or state court administrator to assist other courts and perform other judicial duties for limited periods or specific assignments. This subsection shall not be construed as a directive to the supreme court or state court administrator.