Active members of the Wellesley Contributory Retirement System do not participate in Social Security, and as a result, may be subject to a reduction in Social Security benefit amounts from the Windfall Elimination Provision (WEP) or the Government Pension Offset (GPO). The Windfall Elimination Provision (PDF) applies if you are eligible for Social Security benefits under your own work history. The Government Pension Offset (PDF) applies if you receive Social Security benefits as a spouse or widow.