| Dear Carrie: I'm a 43-year-old male who bought a $300K home six years ago and have it paid off completely. With interest rates so low, I'm wondering about taking out a mortgage and putting the money into the stock market where I'm more likely to get a higher return. Is this the right idea? -- A Reader
Dear Reader: You pose an interesting question: leveraging your house to buy stocks. To help you make a decision, let's take a look at the potential benefit but also think about the risks.
The investment rationale is pretty straightforward. You have an asset that allows you to borrow cheaply. Current 30-year fixed-rate mortgages are right around 5 percent, and the interest is tax deductible. Your effective, after-tax interest rate will depend on your tax bracket, but I'd guess it would be around 3 percent to 4 percent. So, the practical question is this: Can you earn more than that in the stock market?
The answer isn't clear. Yes, stocks have historically returned around 8 percent, and many investment gurus have reduced expectations to closer to 7 percent. So if you can borrow at an effective cost of 3.5 percent and earn an average of 7 percent, it would work in your favor.
 But that's looking at this decision purely from a return perspective. And as an investor, you must look at every investment decision from the potential downside as well. What are you risking if you move ahead?
When you borrow in order to invest, you're taking on risk. You would have mortgage payments to maintain, which should be fine as long as you are confident about your income. But looking at some worst-case scenarios, what if you lose your job? Or the value of your home falls? Or the stock market takes another dive? A combination of these events could put you into a very bad situation.
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