@PRIDDYONE
You would include a sale that occurred in 2017 on your 2017 return. You can amend.
Where you enter it depends on the type of property sold. Was it your primary residence? A second home?
You do not enter the purchase of a property, unless it is a rental property and you collect full rental value for rent. Then amount would be used to determine depreciation.
If it is a second home, you can deduct mortgage interest and property taxes up the the prescribed limits.
