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. Learn how to file form 8594 and when to file. 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. At the top of the form, enter your name and Taxpayer identification number (TIN). Then select Buyer or Seller. Enter your name and taxpayer identification number (TIN) at the top of the form. Then check the box for Purchaser or Seller. Form 8594 is the Asset Acquisition Statement, which the buyer and seller must complete and submit to the IRS.