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.Both the seller and purchaser of a group of assets that makes up a trade or business must use Form 8594 to report such a sale. 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. The Tax Court held that the taxpayer was required to take the assumption of the liability into income despite no corresponding deduction to the taxpayer. Do liabilities assumed get added to the purchase price for purposes of computing Sales Price on Form 8594? Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity.