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Can paying down a mortgage be considered an “investment”?
If your mortgage interest is tax-deductible, it's generally a bad idea to pay down the principal on the mortgage because you'd be losing the tax deduction. You could instead invest it in a tax-free municipal bond fund, especially if you're in a high tax bracket (including state and local marginal tax rates). For example, if you have a 5% rate mortgage on your home, you could invest in a 3.5% municipal bond and still come out ahead when you apply the tax deduction to your income at a 44% (33% federal + 7% state + 4% city in NYC) marginal tax rate.