1. Each judge of the supreme court of Missouri shall receive an annual salary of ninety-one thousand five hundred and ninety-four dollars plus any salary adjustment provided after August 28, 1990, pursuant to section 476.405. Each judge of the court of appeals shall receive an annual salary of eighty-five thousand five hundred dollars plus any salary adjustment provided after August 28, 1990, pursuant to section 476.405. In addition thereto, each of the judges, when temporarily serving, transferred or assigned as a judge of another court than the one to which he was appointed or elected, shall be reimbursed for his actual and necessary travel and other expenses incurred in the performance of such temporary duty. The chief justice of the supreme court shall receive as additional compensation the amount of two thousand five hundred dollars per year.

2. The salaries and expenses shall be paid out of the state treasury and shall constitute the total compensation for all duties performed by, and all expenses of, the judges, and there shall be no further payment made to or accepted by them for the performance of any duties required to be performed by them as judges under the law.

3. The judges shall not practice law or do law business nor shall they accept, during their terms of office, any public appointment or employment for which they receive compensation for their services. Further, any judge who resigns or retires from the supreme court is prohibited from practicing before the supreme court for twenty-four months following the effective date of such resignation or retirement.

4. The expenses provided for in this section shall be paid out of the state treasury upon the certification by the judges so transferred or assigned.