(a) There shall be deducted from the monthly salary of each member and paid into the fund an amount equal to eight and one-half percent of his or her monthly salary. An additional amount shall be paid to the fund by the county commission or political subdivision in which the member is employed in covered employment in an amount determined by the board: Provided, That in no year may the total of the employer contributions provided in this section, to be paid by the county commission or political subdivision, exceed ten and one-half percent of the total payroll for the members in the employ of the county commission or political subdivision.

(b) Any active member who has concurrent employment in an additional job or jobs and the additional employment requires the emergency medical services officer to be a member of another retirement system which is administered by the Consolidated Public Retirement Board pursuant to article ten-d, chapter five of this code shall contribute to the fund the sum of eight and one-half percent of his or her monthly salary earned as an emergency medical services officer as well as the sum of eight and one-half percent of his or her monthly salary earned from any additional employment which additional employment requires the emergency medical services officer to be a member of another retirement system which is administered by the Consolidated Public Retirement Board pursuant to article ten-d, chapter five of this code. An additional percent of the monthly salary of each member shall be paid to the fund by the concurrent employer by which the member is employed in an amount determined by the board: Provided, That in no year may the total of the employer contributions provided in this section, to be paid by the concurrent employer, exceed ten and one-half percent of the payroll for the concurrent member employees.

(c) All required deposits shall be remitted to the board no later than fifteen days following the end of the calendar month for which the deposits are required. If the board upon the recommendation of the board actuary finds that the benefits provided by this article can be actuarially funded with a lesser contribution, then the board shall reduce the required member and employer contributions proportionally. Any county commission or political subdivision which fails to make any payment due the Emergency Medical Services Retirement Fund by the fifteenth day following the end of each calendar month in which contributions are due may be required to pay the actuarial rate of interest lost on the total amount owed for each day the payment is delinquent. Accrual of the loss of earnings owed by the delinquent county commission or political subdivision commences after the fifteenth day following the end of the calendar month in which contributions are due and continues until receipt of the delinquent amount. Interest compounds daily and the minimum surcharge is $50.