The gain or loss on each asset is figured separately. The sale of capital assets results in capital gain or loss.When we're talking about the gain or loss of the sale of an asset we need to be looking at net book value at the time of the sale. Form 4797 is used to report the sale or exchange of property used in a trade or business, for the production of income, or as rental property. Generally, gain from the sale or exchange of a capital asset held for personal use is a capital gain. According to the​ Schedule D instructions: Exclusion of gain on sale of home used for business.