Your math is way off. First, you don't pay the full 42% on all your income. The effective date will likely be in the 25-30% range. Then you assume that the borr

Your math is way off. First, you don't pay the full 42% on all your income. The effective date will likely be in the 25-30% range. Then you assume that the borrower will keep paying 10% down payment every year. That doesn't make sense.