Tips for homeowners who may still be underwater. By Pat Mertz Esswein, Associate Editor From Kiplinger's Personal Finance, July 2015 More than three million homeowners who took home-equity lines of credit between 2005 and 2008 will soon reach the end of their withdrawal period and enter the repayment period, according to RealtyTrac, a supplier of U.S. real estate data. That means they must pay principal and interest, instead of interest only, on any outstanding balance. RealtyTrac figures that the average increase in monthly payments will be $140 in 2015. And more than half of those homeowners are still seriously underwater (they owe more on their homes than they could sell them for), with LTVs of 125% or more, putting them at higher risk of default.See Also: Get Cash From Your Home Some lenders reach out to HELOC borrowers in advance of their “reset.” But if you haven’t heard from yours, consult your loan documents or call your lender to find out what will happen to your payment and when. If you don’t think you can handle the new payment, ask your lender if you can refinance into a new home-equity line of credit (with a new draw period) or a loan with a term that gives you a payment you can afford. If you can’t qualify for a new loan, your lender may be willing to extend the repayment period of your current loan from, say, 10 years to 15 or 20 years. Because lenders typically hold HELOCs on their own books, they may have the latitude to modify your loan terms, says Keith Gumbinger, of HSH.com.