Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. Generally, both the purchaser and seller must file Form 8594 and attach it to their income tax returns (Forms 1040, 1041,.Today's goal is to help you understand the importance of IRS Tax Form 8594 in preparing for sale of your business to a third party… 79Tax year and tax return form number with which the original Form 8594 and any supplemental statements were filed. For a list of forms and schedules available in ATX, please click on federal forms or select a state. A Designation Agreement designating the "reporting person" for purposes of completing IRS Form 1099 and, if applicable, IRS Form 8594. 4.1. 5 Vendor's Affidavit.