AZ SB1517

Amends Arizona's definition of "internal revenue code" to conform to the federal Internal Revenue Code as of January 1, 2019, for taxable years beginning after December 31, 2018.

Updates the definition to include provisions that became effective during 2018 with retroactive effective dates, while excluding any changes enacted after January 1, 2019.

Adds a new provision covering taxable years 2019 onward that specifically includes retroactive provisions from the Bipartisan Budget Act of 2018 (P.L. 115-123) and the Consolidated Appropriations Act, 2018 (P.L. 115-141).

Updates the definition of "internal revenue code" in Arizona Revised Statutes Section 42-1001 from January 1, 2018 to January 1, 2019 to align with the changes in Section 43-105.

Maintains separate definitions for prior taxable years (2008-2018) with their respective effective dates and applicable federal acts.