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Hi Monica,
You're basically correct in what needs to happen.
- Your taxable gain due to the Discharge of Debt is your loan balance (100k) less the fair market value (50k) which equals your taxable gain (50k).
- But your gain is not taxable because it was you primary home. So you will report this discharge on a Form 982 explaining that it was not taxable for this reason.
- Since you have already filed your 2009 taxes you will need to do a Form 1040X to explain why you need to include your 982. Since it does not affect your figures it will be a fairly straight forward fix.
John
PS. I am happy to help you further should you require my assistance. email me