Complete all lines to identify the business or business assets being sold or transferred. This rule disallows the seller's tax loss when a "related party" buys an asset, including a business ownership interest.The disallowed loss doesn't disappear. Illinois requires an addback to federal adjusted gross income (AGI) for expenses paid to certain related parties. So when tangible personal property is part of an asset sale, the parties have to determine whether an exemption covers the asset sale. Seller might obtain the guaranty of another party related to the buyer.