"tax liability does not change"
Well, the tax DID change, by more than $1,000. You got an extra $4,050 income (not tax) deduction for the dependent. That translates to about a $1,000 tax savings if you are in the 25% bracket. But then the AMT went up. That's a different tax.
https://turbotax.intuit.com/tax-tools/tax-tips/IRS-Tax-Return/Alternative-Minimum-Tax--Common-Questi...
