On Wednesday, November 5, 2025, the Supreme Court of the United States heard arguments on executive tariff authority, a case that promises to have ripple effects far beyond the bounds of pure trade law. Trump v. V.O.S. Selections, Inc., No. 25-250. In the chemical sector -- where global chemical feedstocks, complex supply chains, and regulatory compliance are already famously complicated -- the stakes are especially high. If the Court limits or invalidates the President’s ability unilaterally...
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On August 4, 2025, the Internal Revenue Service (IRS) published a notice of determinations that modifies the list of taxable substances to include the following 21 substances: polyphenylene sulfide, cellulose acetate (degree of substitution = 1.5-2.0), 4,4′-isopropylidenediphenol-epichlorohydrin copolymer, nylon 6, caprolactam, methyl ethyl ketoxime, iso-butanol, diethylene glycol monomethyl ether, ethylene glycol phenyl ether, methoxytriglycol, propylene glycol methyl ether acetate, propylene...
September 11, 2024
Petitions Filed to Add Several Chemicals to List of Taxable Substances; Comments Due November 4, 2024
On September 3, 2024, the Internal Revenue Service (IRS) announced that petitions have been filed to add the following chemicals to the list of taxable substances: Diethylene Glycol Monomethyl Ether (89 Fed. Reg. 71788): The Dow Chemical Company, an exporter of diethylene glycol monomethyl ether, filed the petition. According to the petition, diethylene glycol monomethyl ether is an ethylene-based glycol ether solvent. Diethylene glycol monomethyl ether is a liquid used in a variety of...
February 29, 2024
Petition Filed to Add Iso-butanol to List of Chemical Substances Subject to Superfund Excise Tax
The Internal Revenue Service (IRS) announced on February 27, 2024, that it received a petition requested that iso-butanol (also known as isobutanol, iso butyl alcohol, 2-methyl propan-1-ol, or 2-methyl-1-propanol) be added to the list of taxable substances under Section 4672(a) of the Internal Revenue Code. 89 Fed. Reg. 14558. OQ Chemicals Corporation, an exporter of iso-butanol, filed the petition. The notice states: According to the petition, iso-butanol is an isomer of n-butanol. Iso-butanol...
February 23, 2024
Petitions Filed to Add Caprolactam and Nylon 6 to List of Chemical Substances Subject to Superfund Excise Tax
The Internal Revenue Service (IRS) announced on February 22, 2024, that it received petitions requesting that caprolactam (89 Fed. Reg. 13400) and nylon 6 (89 Fed. Reg. 13399) be added to the list of taxable substances under Section 4672(a) of the Internal Revenue Code. AdvanSix Inc., an exporter of caprolactam and nylon 6, filed the petitions. The notice for caprolactam states: According to the petition, caprolactam, a white solid, is primarily used to manufacture nylon resins and other...
July 17, 2023
Petition Filed to Add Methyl Ethyl Ketoxime to List of Chemical Substances Subject to Superfund Excise Tax
The Internal Revenue Service (IRS) announced on July 17, 2023, that it received a petition requesting that methyl ethyl ketoxime (MEKO) be added to the list of taxable substances under Section 4672(a) of the Internal Revenue Code. 88 Fed. Reg. 45454. The petitioner is AdvanSix Inc., an exporter of MEKO. The notice includes the following description of the petition: According to the petition, MEKO is a clear liquid and a high-efficiency, anti-skinning agent that is used for...
On March 29, 2023, the Internal Revenue Service (IRS) published a notice of proposed rulemaking (NPRM) relating to the Superfund excise taxes imposed on certain chemicals and certain imported substances, effective July 1, 2022. 88 Fed. Reg. 18446. There are two separate Superfund chemical excise taxes: a tax on the sale or use of “taxable chemicals” and a tax on the sale or use of imported “taxable substances.” The NPRM contains proposed regulations under Sections 4661, 4662, 4671, and...
January 24, 2023
Petition Filed to Add Polyphenylene Sulfide to List of Chemical Substances Subject to Superfund Excise Tax
The Internal Revenue Service (IRS) announced on December 30, 2022, that it received a petition requesting the addition of polyphenylene sulfide to the list of taxable substances under Section 4672(a) of the Internal Revenue Code. 87 Fed. Reg. 80579. The petitioner is Celanese Ltd., an exporter of polyphenylene sulfide. According to the petition, “polyphenylene sulfide is a high-performance thermoplastic, has high heat and chemical resistance, and is used in applications such as filters,...
January 23, 2023
Petition Filed to Add Bisphenol A Epoxy Resin Copolymer to List of Chemical Substances Subject to Superfund Excise Tax
The Internal Revenue Service (IRS) announced on January 19, 2023, that it received a petition requesting the addition of 4,4′-isopropylidenediphenol-epichlorohydrin copolymer (bisphenol A epoxy resin) to the list of taxable substances under Section 4672(a) of the Internal Revenue Code. 88 Fed. Reg. 3478. The petitioner is Westlake Epoxy Inc., an exporter of 4,4′-isopropylidenediphenol-epichlorohydrin copolymer. According to the petition, “4,4′-Isopropylidenediphenol-Epichlorohydrin...
As reported in our May 19, 2022, memorandum, the Superfund excise tax on certain chemical substances was reinstated beginning on July 1, 2022, under the Infrastructure Investment and Jobs Act. The Internal Revenue Service (IRS) announced on June 24, 2022, that it has posted frequently asked questions (FAQ) on the Superfund chemical excise tax. The IRS released Revenue Procedure 2022-26, which provides the exclusive procedures for requesting a determination under Section 4672(a)(2) of the...