This Client Action Bulletin looks at key areas—including administrative compliance issues—that sponsors of certain defined benefit or defined contribution plans should address by December 31, 2016. By the end of 2016, sponsors of calendar-year single-employer retirement plans must adopt necessary and discretionary plan amendments to ensure compliance with the statutory and regulatory requirements of ERISA and the tax code. Employers should review their retirement plan documents before the end of the year to ensure that discretionary or operational features comply with the tax code.