(a) In general. Sections 1.401 through 1.401-14 (inclusive) reflect the provisions of
section 401 prior to amendment by the Employee Retirement Income Security Act of 1974. The sections following
§ 1.401-14 and preceding
§ 1.402(a)-1 (hereafter referred to in this section as the “Post-ERISA Regulations”) reflect the provisions of
section 401 after amendment by such Act.