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.In this case, the purchaser must file Form 8594. Section 1060 requires the buyer and the seller to file IRS Form 8594. (Asset Acquisition Statement under Section 1060), generally describing the allocation. 1.1 Purchase and Sale of Assets and Assumption of Assumed Liabilities.