The Infrastructure Investment and Jobs Act, section 80201, reinstates the excise taxes imposed on certain chemical substances by sections 4661 and 4671, effective July 1, 2022. Activity letter G is reinstated for persons making inventory exchanges of taxable chemicals under section 4662(c)(2), or persons selling or buying intermediate hydrocarbon streams under section 4662(b)(10). Until the revised Form 637 is released, applicants may use the current Form 637 (Rev. August 2019) by writing-in activity letter G and providing their activity information as instructed in Notice 2021-66.
