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2. In taxation, the amount by which one's tax liability exceeds what the individual person or organization reported. For example, if the IRS disallows certain deductions that the taxpayer applied, he/she will owe more in taxes than he/she reported on the return. Deficiency is the amount this taxpayer still owes to the IRS.
The amount due on a mortgage loan after adding all expenses of foreclosure and accrued interest to the principal balance of the loan and then deducting the sale price or lender-bid price for the property. The balance remaining, if any, may be collected by the lender by means of taking a deficiency judgment, unless prohibited by law or contract. Deficiency judgments may be collected just like any other judgment, through seizure of other assets or garnishment. There are two circumstances when a lender may not collect any deficiency:
1. In states with consumer protection statutes that outlaw deficiencies on first mortgages on a borrower's principal residence.
2. With mortgage loans designated as nonrecourse, meaning the lender and borrower agreed in advance that the property would stand for the debt and there would be no deficiency allowed in the event of foreclosure.