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Mortgage vs. Cash for U.S. home buy now
If you are investing in a mortgage strictly to avoid taxes, the answer is "pay cash now."  A mortgage buys you flexibility, but at the cost of long term security, and in most cases, an overall decrease in wealth too.  At a very basic level, I have to ask anyone why they would pay a bank a dollar in order to avoid paying the government 28 - 36 cents depending on your tax rate. After all, one can only deduct interest- not principal. Interest is like rent, it accrues strictly to the lender, not equity. In theory the recipient should be irrelevant. If you have a need to stiff the government, go ahead. Just realize you making a banker three times as happy.  Additionally the peace of mind that comes from having a house that no banker can take away from you is, at least for me, compelling. If I have a $300,000 house with no mortgage, no payments, etc. I feel quite safe. Even if my money is tied up in equity, if a serious situation came along (say a huge doctors bill) I always have the option of a reverse mortgage later on. So, to directly counter other claims, yes, I'd rather have $300k in equity then $50k in equity and $225k in liquid assets. (Did you notice that the total net worth is $25k less? And that's even before one considers the cash flow implication of a continuing mortgage.  I have no mortgage, and I'm 41. I have a lot of net worth, but the thing that I really like is that I have a roof over my head that no on e can take away from me, and sufficient savings to weather most crises).  That said, a mortgage is not about total cost. It is about cash flow. To the extent that a mortgage makes your cash flow situation better, it provides a benefit- just not one that is quantifiable in dollars and cents. Rather, it is a risk/reward situation. By taking a mortgage even when you have the cash, you pay a premium (the interest rate) in order to have your funds available when you need it.  A very simple strategy to calculate and/or minimize this risk would be to invest the funds in another investment. If your rate of return exceeds the interest rate minus any tax preference (e.g. 4% minus say a 25% deduction = 3%), your money is better off there, obviously. And, indeed, when interest rates are only 4%, it may may be possible to find that. That said, in most instances, a CD or an inflation protected bond or so won't give you that rate of return. There, you'd need to look at stocks- slightly more risky. When interest rates are back to normal- say 5 or 6%, it gets even harder.  If you could, however, find a better return than the effective interest rate, it makes the most sense to do that investment, hold it as a hedge to pay off the mortgage (see, you get your security back if you decide not to work!), and pocket the difference. If you can't do that, your only real reason to hold the cash should be the cash flow situation.