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If you negotiate with the creditor and all or part of the debt is forgiven or the debt would be canceled under bankruptcy protection procedure - you are sent the form 1099-C.
You are correct that the amount of debt forgiven is reportable on 1099-C - http://www.irs.gov/pub/irs-pdf/f1099c.pdf - generally is taxable, unless an insolvency exemption apply -- you should file a form 982 - to proof your insolvency - and might exclude all or part of canceled debt from taxable income.
Please see the IRS Publication 908 Bankruptcy Tax Guide - http://www.irs.gov/pub/irs-pdf/p908.pdf - with example of the form 982 on the last page.
Let me know if you need any help.