A short sale occurs when the proceeds of a real estate sale fall short of the balance owed on the property. In a short sale, the bank or mortgage lender agrees to discount a loan balance due to an economic or financial hardship on the part of the mortgagor. This negotiation is all done through communication with a bank's Loss mitigation department. The home owner/debtor sells the mortgaged property for less than the outstanding balance of the loan, and turns over the proceeds of the sale to the lender, sometimes (but not always) in full satisfaction of the debt. In such instances, the lender would have the right to approve or disapprove of a proposed sale. Most Short Sales leave a deficiency balance for which the Mortgagor / Borrower is still liable. In 99% of all cases it is not a settlement-in-full. A deficiency balance will remain while the mortgage broker, real estate agent / broker, loan officers, title and closing agents still remain getting their profit. And no regulatory agency governs this hybrid transaction.

Extenuating circumstances influence whether or not banks will discount a loan balance. These circumstances are usually related to the current real estate market climate and the individual borrower's financial situation.

A short sale typically is executed to prevent a home foreclosure. Often a bank will choose to allow a short sale if they believe that it will result in a smaller financial loss than foreclosing. For the home owner, the advantages include avoidance of having a foreclosure on their credit history and the partial control of the monetary deficiency.

Lenders have a department (typically called "loss mitigation") that processes potential short sale transactions. Typically, lenders do not accept short sale offers or requests for short sales until a Notice of Default has been issued or recorded with the locality where the property is located.

Lenders have a varying tolerance for short sales and mitigated losses. The majority of lenders have a pre-determined criteria for such transactions. Other distressed lenders may allow any reasonable offer subject to a loss mitigator's approval. Multiple levels of approvals and conditions are very common with short sales. Junior liens - such as second mortgages, HELOC lenders, and HOA (special assessment liens) - may need to approve the short sale. Frequent objectors to short sales include tax lien holders (income, estate or corporate franchise tax - as opposed to real property taxes, which have priority even when unrecorded) and mechanic's lien holders. It is possible for junior lien holders to prevent the short sale. If the lender required mortgage insurance on the loan, the insurer will likely also be party to negotiations as they may be asked to pay out a claim to offset the lender's loss in the short sale.

A short sale does adversely affect a person's credit report, though the negative impact is typically less than a foreclosure. Like all entries except for bankruptcy, short sales remain on a credit report for seven years. Depending upon other credit information it is typically possible to obtain another mortgage 1-3 years after a short sale.