Tax law changes

Sec 50122 is effective Fiscal Year 2022...which started October 2021. So by this time next week this will already be relevant and effective. Some of the "bill" is set to be effective Jan 1 2022, some Jan 1 2023. 

But as this was a question about how to calculate AMI which has other applications, I'm still curious about the answer regardless of legal/political pedantry.