interest, itemize deductions? They'd have to give $4,001 in contributions in order to itemize.
It's not "my" 30%:
https://taxfoundation.org/who-itemizes-deductions/
and it doesn't mean that 30% of filers claim the mortgage interest deduction. The point is that by increasing the standard deduction, the pubs have effectively eliminated the mortgage interest deduction for most who claimed it.
For Americans that didn't itemize (claim the mortgage interest deduction), it's a win; for those that did deduct mortgage interest, the plan is a loss - because the GOP eliminated exemptions.