The purchase and sale agreement for the business entity or assets is a vital document. To get started, fill out the form or call us at 310.955.5830 for an initial consultation. Register Your Business. Use a California business purchase agreement to record the sale of a business. Download your free template today. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. An asset sale is a common method for transferring business ownership.