The Employee Retirement Income Security Act of 1974, as amended (ERISA) was passed to protect employee pensions.
It was passed in response to some spectacular company failures in the 1960's, most notably the Studebaker automobile company. They had failed to put aside sufficient money to pay pensions if they went out of business and, when they did, all their retirees lost their pensions.
This federal law requires certain standards for participation, enrollment, vesting and benefit payments. It also requires that the people who manage a pension plan (
fiduciaries) meet certain standards.
The law generally classifies pension plans into three groups: company plans, government plans and church plans. There are different rules for each of these. It also classifies plans as defined benefit (formula) or defined contribution (individual account). Plans created before ERISA was enacted may not fall clearly into one of these categories.