Shouldn't property tax payment reduce federal tax due just like mortgage interest (itemized deductions)?

[chezro]

When I entered my property tax payment made in 2016, my Federal Tax Due did not reduce at all.  I expected it to drop just like when I entered in mortgage interest.  What gives??  MFJ, itemized deductions

[chezro · Accepted solution]

nvm.  Digging deeper it appears AMT is to blame.