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Mortgage or not?
A primary residence can be an admirable investment/retirement vehicle for a number of reasons. The tax savings on the mortgage are negligible compared to these.  A $200,000 mortgage might result in a $2000 annual savings on your taxes -- but a $350,000 house might easily appreciate $20,000 (tax free!) in a good year. Some reasons to not buy a larger house. Getting into or out of a house is tremendously expensive and inconvenient.  It can make some life-changes (including retirement) more difficult. There is no way to "diversify" a primary residence.  You have one investment and you are a hostage to its fortunes.  The shopping center down the street goes defunct and its ruins becomes a magnet for criminals and derelicts?  Your next-door neighbor is a lunatic or a pyromaniac?  A big hurricane hits your county?  Ha-ha, now you're screwed.  As they say in the Army, BOHICA: bend over, here it comes again. Even if nothing bad happens, you are paying to "enjoy" a bigger house whether you enjoy it or not.  Eating spaghetti from paper plates, sitting on the floor of your enormous, empty dining room, may be romantic when you're 27.  When you're 57, it may be considerably less fun. Speaking for myself, both my salary and my investment income have varied wildly, and often discouragingly, over my life, but my habit of buying and renovating dilapidated homes in chic neighborhoods has brought me six figures a year, year after year after year. tl;dr the mortgage-interest deduction is the smallest of many reasons to invest in residential real-estate, but there are good reasons not to.