Generally, both the purchaser and seller must file Form 8594 and attach it to their income tax returns (Forms 1040, 1041, 1065, 1120, 1120-S, etc.) Page 34. hPurcase. 33.Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. With more than 2,800 federal and state forms and schedules, including state resident, part-year resident, nonresident, and automated.