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Pay down on second mortage when underwater?
I think everyone else answered before you added the info about your car loan in your comment. While it makes sense to pay off loans with the highest interest rate first, keep in mind that in most cases you can deduct mortgage interest from your taxable income. So the after-tax rate of interest that you're paying on your 8.6% second mortgage will be less than your 7% car loan, assuming that your tax bracket is more than 18% (federal and state combined). If you plan to use your funds to pay down debt, definitely attack the car loan first.