This document contains final regulations that provide guidance on the tax treatment of Treasury Inflation-Protected Securities issued with more than a de minimis amount of premium. This document also contains temporary regulations that provide guidance on the tax treatment of a debt instrument with a bond premium carryforward in the holder's final accrual period, including a Treasury bill acquired at a premium. The regulations in this document provide guidance to holders of Treasury Inflation-Protected Securities and other debt instruments. The text of the temporary regulations in this document also serves as the text of the proposed regulations (REG-140437-12) set forth in the Proposed Rules section in this issue of the Federal Register.