Social Security Act
Section 11. Effect of Separation from Employment. - When an employee under compulsory coverage is separated from employment, his employer's contribution on his account and his obligation to pay contributions arising from that employment shall cease at the end of the month of separation, but said employee shall be credited with all contributions paid on his behalf and entitled to benefits according to the provisions of this Act. He may, however, continue to pay the total contributions to maintain his right to full benefit.