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.Who Must File Form 8594? Both the seller and purchaser of a group of assets that make up a trade or business need to file Form 8594. Go to Screen 65, Asset Acquisition Statement (8594) (Screen 58 for S-Corp). Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. Learn how to file form 8594 and when to file. For a list of forms and schedules available in ATX, please click on federal forms or select a state.