The cap for the mortgage interest deduction was formerly $1 million. The modest reduction to $750k is about the only good provision in the new tax bill. This works out to about a maximum $4k annual tax increase for someone with a $1 million mortgage with a 5% interest rate. That homeowner's monthly mortgage payment would be about $5,500/mo. In other words, the tax increase would equal less than one month's loan payment. Anybody at that income level can afford the tax increase.