Vested in the benefits they have accrued to that point. The Middlesex Retirement Savings and Investment Plan is required to comply with all ERISA.Does having a written plan cause a nonERISA 403(b) plan to become subject to ERISA? All 403(b) plans are subject to Title I of ERISA unless an exemption applies. ERISA does not require any employer to establish a retirement plan. It only requires that those who establish plans must meet certain minimum standards. Former employees who have received a "cash-out" distribution or deemed distribution of their entire non-forfeitable accrued benefit. Because a nonqualified plan is not subject to ERISA rules, a QDRO is not used to set aside benefits for the former spouse. Most employersponsored retirement plans are subject to ERISA requirements.