If you received a Form 1099-S, that means the IRS got a copy as well. That doesn't necessarily mean you owe tax on the sale, though. It could be a mistake, or the closing agent might not have had the proper paperwork. If you qualify for the exclusion to make all of your profit tax-free, don't report the home sale. But make sure all your paperwork is in order to show the IRS if it asks.
