After you get the 1099-S you probably need to fill out an amended return to include it. On, I now see the IRS said you didn't need to amend.
And it doesn't matter how much the proceeds you got or what you did with it. Not even how much mortgage you had. The tax is based on the Net Profit, Sales price minus the original purchase price you paid including the mortgage.
So how much did you sell it for and how much did you pay for it? On a Joint return you can exclude $500,000 of the profit if you lived in it 2 of the last 5 years on the date of sale.
