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.Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. 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. Most business sales stipulate in the sales and purchase agreements how much of the purchase price is allocated to each asset, inventory, and to goodwill. If you're buying or selling a business, the Internal Revenue Service requires you to complete Form 8594. Use this helpful guide to assist you along the way.