Normally, debt that is forgiven or cancelled by a lender must be included as income on your tax return and is taxable. But the Mortgage Forgiveness Debt Relief Act allows you to exclude certain cancelled debt on your principal residence from income. Debt reduced through mortgage restructuring, as well as mortgage debt forgiven in connection with a foreclosure, qualifies for the relief. The Act applies only to forgiven or cancelled debt used to buy, build or substantially improve your principal residence, or to refinance debt incurred for those purposes. In addition, the debt must be secured by the home. This is known as qualified principal residence indebtedness. The maximum amount you can treat as qualified principal residence indebtedness is $2 million or $1 million if married filing separately.

For more information, visit:
http://www.irs.gov/individuals/article/0,,id=179414,00.html