This document contains temporary regulations relating to the circumstances under which a party, by reason of having made a qualified offer, will be entitled to an award of reasonable administrative and litigation costs in a civil tax proceeding brought in a court of the United States (including the Tax Court). The regulations implement certain changes made by section 3101(e) of the Internal Revenue Service Restructuring and Reform Act of 1998. They affect taxpayers who make qualified offers. The text of these regulations also serves as the text of the proposed regulations set forth in the notice of proposed rulemaking on this subject in the Proposed Rules section of this issue of the Federal Register.