Both the seller and purchaser of a group of assets that makes up a trade or business must use Form 8594 to report such a sale. Form 8594 must also be filed if the purchaser or seller is amending an original or a previously filed supplemental Form.8594 because of an increase or decrease. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. The seller and purchaser must file Form 8594 as an attachment to their respective income tax return for the year in which the sale date occurred. – Both the purchaser and seller are required to file Form 8594. ▶ Attach to your income tax return.