The underlying asset would be any distribution of proceeds on foreclosure etc.

DEBT OUTSTANDING-Reported on Form 1099-A, Information Return for Acquisition or Abandonment of Secured Property, for each borrower if money is lent in connection with the trade or business and, in full or partial satisfaction of the debt, an interest in property that is security for debt is acquired, or the lender has reason to know that the property has been abandoned.

Property means real property, such as a personal residence, intangible property, or tangible personal property held for investment or used in a trade or business. This is the debt outstanding at the time the interest in the property was acquired or on the date one first knew or had reason to know that the property was abandoned.

DEBT SATISFIED--For acquisition by the lender only of property, the amount of debt satisfied by the acquisition.

FAIR MARKET VALUE--The standard for determining value of property received in an exchange or acquisition. In the case of foreclosure, execution, or similar sale, the proceeds of sale will be considered the fair market value of the property in the absence of clear and convincing evidence to the contrary. Money field is positive.

Several of the IRS documents available that can give you information are listed below. These can be obtained from your local IRS office.

Instruction to Filers of Forms 1099, 1098, 5498, 1096, and W2-G

Publication 916, Information Returns

Publication 550, Investment Income and Expenses

Publication 525, Taxable and Nontaxable Income

Publication 905, Tax Information Unemployment Compensation