johnmcdonnellb52 said: I realize that equity changes based on the value of the property, but in this case, the loan terms specify 20% of the loan value must be paid off before the mortgage insurance drops off. (I should have said that more precisely in my question.) The problem is that the What If Tool doesn't allow me to change how much extra principal I'm planning on paying once that extra money is available in a couple years. I'm just trying to figure out if there's some workaround.