I don't know the details of the 2023 vs 2024 rules.
It's just that the actual "software" tax form you will need for 2023 taxes will apparently not be fully available in the "software" until late Feb (though the software team might change that date as they progress).
SO the proper allowances dates etc will not be updated until the full form is "software" ready.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
