This document contains temporary regulations relating to the federal income tax treatment of inflation-indexed debt instruments, including Treasury Inflation-Indexed Securities. The text of the temporary 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. This document also contains amendments to final regulations to reflect the addition of the temporary regulations. The regulations in this document provide needed guidance to holders and issuers of inflation-indexed debt instruments.