TCJA Changes to Itemized Deductions & AMT :
Removed the cap on overall allowable itemized deductions for filers with AGI above certain thresholds ( known as the Pease limitation )
However , many taxpayers were forced to switch to the standard deduction due to the significant changes to itemized deductions
TCJA retained the AMT for individual taxpayers but raised the exemption levels and the income threshold at which the AMT exemption phases out to $ 1M for married individuals and $ 500,000 for others ( both indexed for inflation )
TCJA changes to itemized deductions and the increase in the AMT exemption significantly decreased the number of taxpayers subject to AMT