How it works is say you have a mortgage on the house (say 200000) and you have a lump some of money (say 50000) you can put 50000 to pay off your mortgage, take out a 50000 loan and invest that. so you still have 200000 debt but 50000 of that is now an investment and the interest from that is tax deductable.
now if you have a business and accur say 20000 in a year instead of paying off the business expense, you pay off 20000 off your mortgage, and borrow the 20000 again to pay the business now the interest of 20000 of your mortgage is tax deductable.
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