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.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. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. IRS Form 8594 defines seven asset classes to which the entire purchase price must be allocated. This form provides the IRS with a detailed breakdown of how the purchase price is allocated across different asset categories. – 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. According to section 1060 of the Internal Revenue Code, the IRS requires that you fill out and file Form 8594 when you're buying or selling a business.