IRS modifies effective date for adding to taxable substances list under IRC Section 4672(a)

27 March 2023

In Revenue Procedure 2023-20, the IRS modifies the effective date for additions to the list of taxable substances under IRC Section 4672(a). The change modifies the date on which substances are added to the taxable substances list for purposes of refund claims under IRC Section 4662(e).

Published by NTD’s Tax Technical Knowledge Services group; Carolyn Wright, legal editor

Document ID: 2023-0585

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