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.Do liabilities assumed get added to the purchase price for purposes of computing Sales Price on Form 8594? The tax professional who comes into contact with such a situation should consider the need to file Form 8594, or to revise the valuation of specific assets. Learn how to file form 8594 and when to file. IRS Form 8594 defines seven asset classes to which the entire purchase price must be allocated. The sum of the amounts allocated to Classes IV and V are reported in the aggregate on Form 8594. See Appendix A; see also T.D. 8711 (Jan.