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Pros and Cons of Interest Only Loans
The main disadvantage is that interest rates are higher for the interest-only loan. It's higher risk to the bank, since the principal outstanding is higher for longer.  According to the New York Times, "Interest rates are usually an eighth- to a half-percentage point higher than on fully amortized jumbo loans." They're also tougher to qualify for, and fewer lenders offer them, again due to the risk to the bank. Since you can always put extra towards the principal, strictly speaking, these are the only  downsides. The upside, of course, is that you can make a lower payment each month. The question is what are you doing with this? If this is the only way you can afford the payments, there's a good chance the house is too expensive for you. You're not building equity in the home, and you have the risk of being underwater if the house price goes down. If you're using the money for other things, or you have variable income, it might be a different story. For the former, reinvesting in a business you own might be a reason, if you're cognizant of the risks. For the latter, salespeople on commission, or financial industry types who get most of their income in bonuses, can benefit from the flexibility.