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.Today's goal is to help you understand the importance of IRS Tax Form 8594 in preparing for sale of your business to a third party… Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. The current liabilities of the Seller included in the Assumed Liabilities and the current assets of the Seller included in the Assets. Filed with the Securities and Exchange Commission. 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.