The IRS has provided additional interim guidance in Notice 2023-64 for the application of the new corporate alternative minimum tax (CAMT). This guidance clarifies and supplements the CAMT guidance provided in Notice 2023-7, I.R.B. 2023-3, 390, and Notice 2023-20, I.R.B. 2023-10, 523, which were issued earlier this year. The IRS anticipates that the forthcoming proposed regulations on the CAMT will be consistent with this interim guidance and that they will apply for tax years beginning on or after January 1, 2024. Taxpayers may rely on the interim guidance for tax years ending on or before the date the forthcoming proposed regulations are published, and for any tax year that begins before January 1, 2024.

The IRS has updated its simplified procedure for estates requesting an extension of time to make a portability election under Code Sec. 2010(c)(5)(A). The updated procedure replaces that provided in Rev. Proc. 2017-34. If the portability election is made, a decedent's unused exclusion amount (the deceased spousal unused exclusion (DSUE) amount) is available to a surviving spouse to apply to transfers made during life or at death. The simplified method is to be used instead of the letter ruling process. No user fee is due for submissions filed in accordance with the revenue procedure.