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QUICK REFERENCE GUIDE FOR PUBLIC EMPLOYERS <br />Note: Employees covered under a public retirement system may also be covered for social <br />security by a Section 218 Agreement. <br />All state and local government employees hired after March 31, 1986, are subject to the <br />Medicare tax. A worker hired prior to April 1, 1986, and not covered by a section 218 <br />Agreement, may be exempt from Medicare if he or she was a bona fide employee on that date, <br />and has been in continuous service since that date. Any worker hired after March 31, 1986, <br />must be covered by Medicare, either by a section 218 Agreement or under mandatory <br />coverage provisions. See Revenue Ruling 86-88 in Publication 963. <br />Note: Any Section 218 Agreement in effect on April 20, 1983, cannot be terminated regardless <br />of whether an additional retirement plan is later made available to affected employees. <br />3. PUBLIC RETIREMENT SYSTEM <br />As stated above, employees are excluded from mandatory social security coverage if they are <br />covered by a public retirement system. "A "public retirement system" is not required to be a <br />qualified plan within the meaning of the Employees' Retirement Income Security Act of 1974 <br />(ERISA). The employee may be a member of any type of retirement system, including a <br />nonqualified system (for example, a section 457(b) plan, discussed below), as long as the plan <br />provides a minimum level of benefits, as specified by law, under that system. <br />A public retirement system may take one of two forms: the defined benefit retirement <br />system, which is based on a guaranteed minimum benefit, and the defined contribution <br />retirement system, which is based on a required contribution from the employee. <br />In order for a defined benefit retirement system to be considered a public retirement system, <br />it must provide a benefit generally comparable to that provided by social security. The <br />computation of the benefit that the plan provides is made based on various factors, including <br />years of service rendered by the employee, compensation earned by the employee and the <br />age of the employee at retirement. The Service issued Revenue Procedure 91-40 to clarify the <br />minimum retirement benefit tests, which must be met in the plan's formula. This Revenue <br />Procedure can be found in the Appendix of Publication 963. <br />In order for a defined contribution retirement system to be considered a qualified plan, the <br />worker must be covered in a plan in which, generally, at least 7.5% of his/her compensation is <br />credited to a retirement plan account on his or her behalf. This contribution can be any <br />combination of employer and employee contributions, but must total a minimum of 7.5% of <br />pay, and cannot include any credited interest in the calculation. The system may include any <br />plan described in section 401(a), an annuity plan or contract under section 403(b) or a plan <br />described in section 457(b) or (f) of the Internal Revenue Code. <br />Any person working for a public employer after July 1, 1991, who is not covered by a public <br />retirement system that meets the requirements discussed above, or the defined benefit system <br />5 <br />