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Is it possible to make money by getting a mortgage?
To keep the math simple, say you are in the 25% federal tax bracket. Your 4% mortgage effectively costs you 3%. Did Mr Advisor tell you what he suggests investing the money in? Borrowing at 3% net to put the money in .1% CDs makes little sense. And for most people, investing it in the stock market hoping to come out ahead, also makes little sense.  Credentials or not, people like him give humans a bad name, and make me love my dog even more. I'd stay far away from this guy. Very far away.  Edit - on further reflection (seeing mhoran's reference to $100K) it occurred to me that once a house is paid off, the only deductions allowed is for the first $100K of new mortgage or HELOC, absent a renovation or improvement of some kind. Given the limit and current 4% rates, it would seem to me that a rich retiree paying a fortune in taxes, isn't going to benefit much for a $4000 deduction.