Learn about the ERISA Audit and benefit plan audit services offered to Tucson and Phoenix 401k plan sponsors - Arizona ERISA Audit - Phoenix, AZ 85001. Learn about the ERISA DOL and retirement plan audit services offered to businesses in Phoenix, Tucson, and across Arizona.A governmental retirement plan must meet certain minimum benefit or contribution standards to qualify as a public retirement system. 401(a) Optional Retirement Plan ; What contributions are available? To obtain contribution information regarding this plan, contact TIAA at 800-842-2252. ERISA has rules governing when employers must transmit employee contributions to pension plans. Keep up the good work! Act of 1974 (ERISA) .