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. Enter your name and taxpayer identification number (TIN) at the top of the form. Then check the box for Purchaser or Seller. IRS Form 8594 breaks down the assets of the business being purchased or sold into seven classes or categories. Form 8594 is the Asset Acquisition Statement, which the buyer and seller must complete and submit to the IRS.