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. – Both the purchaser and seller are required to file Form 8594. – The Form 8594 must be attached to each filer's timely filed Federal income tax return. Angela would file a Form 8594 outlining the allocation of purchase price amongst the assets purchased. Basis and holding period: This item describes the differing results between a transaction accomplished through a Sec.