Section 13
SEC 13. Paragraph (a) of Section twenty-two of the same Act is further amended to read as follows: "SEC. 22. Remittance of premiums.—(a) The contributes imposed in the preceding sections shall be remitted to the System within the first seven days of each calendar month following the month for which they are applicable within such time as the Commission may prescribe. Every employer required to deduct and to remit contributions, shall be liable for their payment, and if any contribution is not paid to the System, as herein prescribed, he shall pay besides the contribution a penalty thereon of three per centum per month from the date the contribution falls due until paid. If deemed expedient and advisable by the Commission, the collection and remittance of contributions shall be made quarterly or semi-annually in advance, the contributions payable by the employees to be advanced by their respective employers: Provided, That upon separation of an employee, any premium so paid in advance but not due shall be credited or refunded to his employer."