Q: I can afford the larger payment on a 15-year fixed-rate mortgage, but I plan to take a 30-year anyway, invest the difference in the cash flow, and end up ahead. Is there a flaw in this plan? A: Yes. The flaw is that the investment return required to make the plan work is much too large. You will almost certainly end up poorer than if you take the 15-year mortgage. If 15-year and 30-year loans carried the same rate, say 6 percent--and you earned 6 percent by investing the difference in monthly payments--you would end up in the same place. Your investment return would have to exceed 6 percent to come out ahead on the 30-year loan. Assuming 15-year loans carry a lower rate, which is almost always the case, the required return to break even rises. For example, assume the 30-year rate is 6 ...
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