26 U.S.C. § 4672 (INTERNAL REVENUE CODE)
§ 4672. Definitions and special rules
(a) Taxable substance
For purposes of this subchapter—
(1) In general
The term “taxable substance” means any substance which, at the time of sale or use by the importer, is listed as a taxable substance by the Secretary for purposes of this subchapter.
(2) Determination of substances on list
A substance shall be listed under paragraph (1) if—
(A) the substance is contained in the list under paragraph (3), or
(B) the Secretary determines, in consultation with the Administrator of the Environmental Protection Agency and the Commissioner of U.S. Customs and Border Protection, that taxable chemicals constitute more than 50 percent of the weight (or more than 50 percent of the value) of the materials used to produce such substance (determined on the basis of the predominant method of production).
If an importer or exporter of any substance requests that the Secretary determine whether such substance be listed as a taxable substance under paragraph (1) or be removed from such listing, the Secretary shall make such determination within 180 days after the date the request was filed.
(3) Initial list of taxable substances
Cumene
Methylene chloride
Styrene
Polypropylene
Ammonium nitrate
Propylene glycol
Nickel oxide
Formaldehyde
Isopropyl alcohol
Acetone
Ethylene glycol
Acrylonitrile
Vinyl chloride
Methanol
Polyethylene resins, total
Propylene oxide
Polybutadiene
Polypropylene resins
Styrene-butadiene, latex
Ethylene oxide
Styrene-butadiene, snpf
Ethylene dichloride
Synthetic rubber, not containing fillers
Cyclohexane
Urea
Isophthalic acid
Ferronickel
Maleic anhydride
Ferrochromium nov 3 pct
Phthalic anhydride
Ferrochrome ov 3 pct. carbon
Ethyl methyl ketone
Unwrought nickel
Chloroform
Nickel waste and scrap
Carbon tetrachloride
Wrought nickel rods and wire
Chromic acid
Nickel powders
Hydrogen peroxide
Phenolic resins
Polystyrene homo­polymer resins
Polyvinylchloride resins
Melamine
Polystyrene resins and copolymers
Acrylic and methacrylic acid resins
Ethyl alcohol for nonbeverage use
Vinyl resins
Ethylbenzene
Vinyl resins, NSPF.
(4) Modifications to list
The Secretary shall add to the list under paragraph (3) substances which meet either the weight or value tests of paragraph (2)(B) and may remove from such list only substances which meet neither of such tests.
(b) Other definitions
For purposes of this subchapter—
(1) Importer
The term “importer” means the person entering the taxable substance for consumption, use, or warehousing.
(2) Taxable chemicals; United States
The terms “taxable chemical” and “United States” have the respective meanings given such terms by section 4662(a).
(c) Disposition of revenues from Puerto Rico and the Virgin Islands
The provisions of subsections (a)(3) and (b)(3) of section 7652 shall not apply to any tax imposed by section 4671.
(Added Pub. L. 99–499, title V, § 515(a), Oct. 17, 1986, 100 Stat. 1768; amended Pub. L. 100–647, title II, § 2001(b), Nov. 10, 1988, 102 Stat. 3594; Pub. L. 114–125, title VIII, § 802(d)(2), Feb. 24, 2016, 130 Stat. 210.)
heading: Amendments
text: 1988—Subsec. (a)(2). Pub. L. 100–647, § 2001(b)(2), inserted at end “If an importer or exporter of any substance requests that the Secretary determine whether such substance be listed as a taxable substance under paragraph (1) or be removed from such listing, the Secretary shall make such determination within 180 days after the date the request was filed.”
Subsec. (a)(2)(B). Pub. L. 100–647, § 2001(b)(1), inserted “(or more than 50 percent of the value)” after “weight”.
Subsec. (a)(4). Pub. L. 100–647, § 2001(b)(3), amended par. (4) generally. Prior to amendment, par. (4) read as follows:
“(A) In general.—The Secretary may add substances to or remove substances from the list under paragraph (3) (including items listed by reason of paragraph (2)) as necessary to carry out the purposes of this subchapter.
“(B) Authority to add substances to list based on value.—The Secretary may, to the extent necessary to carry out the purposes of this subchapter, add any substance to the list under paragraph (3) if such substance would be described in paragraph (2)(B) if ‘value’ were substituted for ‘weight’ therein.”
heading: Change of Name
text: “Commissioner of U.S. Customs and Border Protection” substituted for “Commissioner of Customs” in subsec. (a)(2)(B) on authority of section 802(d)(2) of Pub. L. 114–125, set out as a note under section 211 of Title 6, Domestic Security.
heading: Effective Date of 1988 Amendment
text: Amendment by Pub. L. 100–647 effective, except as otherwise provided, as if included in the provision of the Superfund Revenue Act of 1986, Pub. L. 99–499, title V, to which it relates, see section 2001(e) of Pub. L. 100–647, set out as a note under section 56 of this title.
heading: Effective Date
text: Section effective Jan. 1, 1989, see section 515(c) of Pub. L. 99–499, set out as a note under section 4671 of this title.
heading: Transfer of Functions
text: For transfer of functions, personnel, assets, and liabilities of the United States Customs Service of the Department of the Treasury, including functions of the Secretary of the Treasury relating thereto, to the Secretary of Homeland Security, and for treatment of related references, see sections 203(1), 551(d), 552(d), and 557 of Title 6, Domestic Security, and the Department of Homeland Security Reorganization Plan of November 25, 2002, as modified, set out as a note under section 542 of Title 6.