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Buying a house. I have the cash for the whole thing. Should I still get a mortgage to get the homeowner tax break?
Not for the tax break, no; as others have said that still costs you money. However, with rates being low right now and brought a bit lower by the tax break, this is an opportunity for the safest form of leveraged investing you will ever find. If you invest that money, the returns on investment will probably be better than the mortgage rate, and that leaves you with a net profit. There is some risk if the market collapses, but it's less risk than any other form of borrowing to invest. That also leave you with more flexibility if you need cash in a hurry; you can draw down the investments rather than taking another loan. If the risk bothers you, you can do what I did and split the difference. I put 50% down and financed the rest. I sometimes regret not having pushed it harder, since it has worked out well for me ... but that was the level of risk I was comfortable with.