This document contains final regulations providing guidance on the notification requirements under section 4980F of the Internal Revenue Code (Code) and section 204(h) of the Employee Retirement Income Security Act of 1974 (ERISA). Under these final regulations, a plan administrator must give notice of a plan amendment to certain plan participants and beneficiaries when the plan amendment provides for a significant reduction in the rate of future benefit accrual or the elimination or significant reduction in an early retirement benefit or retirement-type subsidy. These final regulations affect retirement plan sponsors and administrators, participants in and beneficiaries of retirement plans, and employee organizations representing retirement plan participants.