Regulations last checked for updates: Oct 15, 2026

Title 19 - Customs Duties last revised: Aug 26, 2026
authority: 5 U.S.C. 301; 19 U.S.C. 66,1202,Harmonized,1551,1552,1553,1623,1624; Section 18.1 also issued under 19 U.S.C. 1484,1557,1490; Section 18.2 also issued under 19 U.S.C. 1551a; Section 18.3 also issued under 19 U.S.C. 1565; Section 18.4 also issued under 19 U.S.C. 1322,1323; Section 18.7 also issued under 19 U.S.C. 1490,1557; 1646a; Section 18.11 also issued under 19 U.S.C. 1484; Section 18.12 also issued under 19 U.S.C. 1448,1484,1490; Section 18.13 also issued under 19 U.S.C. 1498(a); Section 18.14 also issued under 19 U.S.C. 1498. Section 18.25 also issued under 19 U.S.C. 1490. Section 18.26 also issued under 19 U.S.C. 1490. Section 18.31 also issued under 19 U.S.C. 1553a.
source: CBP Dec. 17-13, 82 FR 45394, Sept. 28, 2017, unless otherwise noted.