Is your mortgage interest split between your residence and a rental property? Did you enter more than one Form 1098? Did you use all your mortgage proceeds to purchase or improve your main home? Did you take the standard deduction or did you itemize?
It appears this negative number has been calculated from one or more entries made under the Mortgage Interest section of Deductions & Credits. You may wish to review your answers to the questions after you enter Form 1098 to be sure the entire amount should be included in the itemized deduction calculation.
Also review Schedule A, the Tax & Int Wks, and any AMT forms under Form 1040 in the forms list in case the negative number came from a federal form.
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