Section 12
SEC. 12. Section nineteen of the same Act is further amended to read as follows: "SEC. 19. Employer's contribution.—Beginning as of the last day of the month when an employee’s compulsory coverage takes effect and every month thereafter during his employment, his employer shall pay, with respect to such covered employee, the employer's contribution in accordance with the schedule indicated in Section eighteen of this Act. Notwithstanding any contract to the contrary, an employer shall not deduct, directly or indirectly, from the compensation of his employees covered by the System or otherwise recover from them the employer's contribution with respect to such employees."