Generally, both the purchaser and seller must file Form 8594 and attach it to their income tax returns (Forms 1040, 1041,. 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. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. Both parties are required to file Form 8594 alongside their respective tax returns to report the tax consequences of the asset acquisition accurately. For additional information please click here.