You are required to report all sales of businesses to the Illinois Department of Revenue. Disclosure of this information is REQUIRED.Use Form 4797 to report: The sale or exchange of property. The involuntary conversion of property and capital assets. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer. Filling out the CBS-1 Notice of Sale form is straightforward. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. Read Form CBS-1 Instructions for additional information. Step 1: Identify the business, business assets, or business property being sold or transferred. How do I fill this out?