This Act may be cited as the Last Sale Valuation Act of 2026.

Section 402 of the Tariff Act of 1930 (19 U.S.C. 1401aU.S. Code — Title 19, Section 1401aView official source on GovInfo) is amended— (1) in subsection (b)(4), by adding at the end the following: (C) The term sold for exportation to the United States, with respect to imported merchandise, means— (i) in the case of a transaction involving one sale, the price actually paid or payable by the buyer in the United States to the seller located in another country for the merchandise; and (ii) in the case of a transaction involving a series of sales, the price actually paid or payable by the buyer in the United States for the merchandise in the last sale that introduces the merchandise into the United States.; and (2) in subsection (h)(5), in the flush text following subparagraph (C), by inserting, including access to books and records by U.S. Customs and Border Protection after adjustment.