To add the expense for the barn, you will need to make a reasonable computation of the barn's cost/basis. Since the purchase price of your home included the barn, one way to make the computation is to take the total square footage of all the buildings on the property, including the house, and divide the barn's square footage by the total square footage to arrive at a percentage. Then apply this percentage to the price you paid for the property when purchased in 2007 and use that amount as the cost of the barn.
