Interest on a mortgage is tax deductible in the USA. According to Wikipedia, in 1913 "the reason for the deduction was that in a nation of small proprietors, i

Interest on a mortgage is tax deductible in the USA. According to Wikipedia, in 1913 "the reason for the deduction was that in a nation of small proprietors, it was more difficult to separate business and personal expenses, and so it was simpler to just allow deduction of all interest" https://en.wikipedia.org/wiki/Home_mortgage_interest_deduction https://en.wikipedia.org/wiki/Home_mortgage_interest_deducti...