You (or the purchaser or transferee) must complete Form CBS-1, Notice of Sale, Purchase, or Transfer of Business Assets. Each sale has different pros and cons.The seller should be ready to provide detailed information about the business's assets, liabilities, revenues, costs, and customer base, among other things. To sell a business in Illinois, you'll need various legal documents, including a bill of sale, asset purchase agreement, and non-disclosure agreements. Structure your transaction in your best interest. See how can an asset purchase agreement can help you have a seamless acquisition. If you need additional information, you may call our Chicago office weekdays between a.m.