This document contains final regulations relating to interest- free adjustments with respect to underpayments of employment taxes. These final regulations reflect changes to the law made by the Taxpayer Relief Act of 1997. The final regulations affect employers that are the subject of IRS examinations involving determinations by the IRS that workers are employees for purposes of subtitle C or that the employers are not entitled to relief from employment taxes under section 530 of the Revenue Act of 1978.