Section 9. Coverage - Social Security Act

(a) Coverage in the SSS shall be compulsory upon all employees including kasambahays or domestic workers not over sixty (60) years of age and their employers: Provided, That any benefit already earned by the employees under private benefit plans existing at the time of the approval of this Act shall not be discontinued, reduced or otherwise impaired: Provided, further, That private plans which are existing and in force at the time of compulsory coverage shall be integrated with the plan of the SSS in such a way where the employers contribution to his private plan is more than that required of him in this Act, he shall pay to the SSS only the contribution required of him and he shall continue his contribution to such private plan less his contribution to the SSS so that the employer's total contribution to his benefit plan and to the SSS shall be the same as his contribution to his private benefit plan before the compulsory coverage: Provided, further, That any changes, adjustments, modifications, eliminations or improvements in the benefits to be available under the remaining private plan, which may be necessary to adopt by reason of the reduced contributions thereto as a result of the integration, shall be subject to agreements between the employers and employees concerned: Provided, further, That the private benefit plan which the employer shall continue for his employees shall remain under the employer's management and control unless there is an existing agreement to the contrary: Provided, finally, That nothing in this Act shall be construed as a limitation on the right of employers and employees to agree on and adopt benefits which are over and above those provided under this Act.

(b) Spouses who devote full time to managing the household and family affairs, unless they are also engaged in other vocation or employment which is subject to mandatory coverage, may be covered by the SSS on a voluntary basis.