A municipal affiliated public employer may elect by resolution of its governing body or by execution of a collective bargaining agreement and in the manner prescribed by the retirement board to be responsible for making contributions of up to seventy-five percent of its employees’ member contributions as follows:

A. the resolution or collective bargaining agreement shall be irrevocable; except that:

(1)     if the resolution is passed or the collective bargaining agreement is executed on or before June 30, 2020, the percentage of the employee contributions that the municipal affiliated public employer elects to be responsible for making shall apply to the statutory employee contribution rate in effect on June 30, 2020 and shall not apply to any increase in the statutory employee contribution rate that may occur after that date; and

(2)     if the resolution is passed or the collective bargaining agreement is executed on or after July 1, 2020, the percentage of the employee contributions that the municipal affiliated public employer elects to be responsible for making shall apply to the statutory employee contribution rate in effect on the date that the resolution is passed or the collective bargaining agreement is executed and shall not apply to any increases in the statutory employee contribution rate that may occur after that date;

provided, however, that if the statutory employee contribution rate is decreased after the date that the resolution is passed or the collective bargaining agreement is executed, the percentage of the employee contributions that the municipal public affiliated employer is responsible for making shall apply to the decreased statutory employee contribution rate;

B. a municipal affiliated public employer may by subsequent resolution or collective bargaining agreement:

(1)     elect to increase the percentage of employee member contributions for which it will be responsible;

(2)     elect to be responsible for a percentage of any increase to the statutory employee contribution rate in effect after the passing of an earlier resolution or the execution of an earlier collective bargaining agreement; or

(3)     at the time a new coverage plan is adopted, elect to be responsible under the new coverage plan for making a different percentage of employee member contributions than that which it elected under a previous coverage plan;

C. the resolution or executed collective bargaining agreement shall apply to all employees or else to specified employee divisions of the municipal affiliated public employer and shall be effective the first pay period of the month following the filing of the resolution with the retirement board;

D. the portion of the employee contributions made by the municipal affiliated public employer on behalf of a member shall be credited to the member’s individual accumulated member contribution account in the member contribution fund. The member shall be responsible for the difference between the contributions the member would be required to make if the municipal affiliated public employer had not made the election provided for in this section and the amount contributed by the municipal affiliated public employer pursuant to the provisions of this section;

E. pensions payable to members whose municipal affiliated public employer makes the election provided for in this section shall be the same as if the member had made the entire member contribution; and

F. any municipal affiliated public employer increasing the percentage of the employee member contributions it elects to make pursuant to this section shall submit a resolution or executed collective bargaining agreement to the association by July 1 of the fiscal year in which the increase will take place indicating the percentage of the employee member contributions that will be made by the municipal affiliated public employer.