This document sets forth final regulations relating to certified professional employer organizations (CPEOs). The Stephen Beck, Jr., Achieving a Better Life Experience Act of 2014, required the IRS to establish a voluntary certification program for professional employer organizations. These final regulations set forth the requirements a person must satisfy in order to become and remain a CPEO and the federal employment tax liabilities and other obligations of persons certified by the IRS as CPEOs. These final regulations will affect persons who apply to be treated as CPEOs and who are certified by the IRS as meeting the applicable requirements. In certain instances, the final regulations will also affect the federal employment tax liabilities and other obligations of customers of the CPEO.