Regulations last checked for updates: Jan 24, 2026

Title 19 - Customs Duties last revised: Jan 22, 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.