I'm guessing interest deductions for rentals (business expense) would be treated differently than primary residence.
If you look at the actual dollar numbers, the mortgage deduction is heavily slanted toward the higher income crowd with their high tax rates and McMansions, surprising that the class warfare crowd hasn't noticed that, or doesn't want to talk about it. LOL
3% on a $100K mortgage is $3000. The standard deduction is much higher than $3000
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