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. Form 8594 is use to report sale of a group of asset that makes up a trade or business. This form called the Statement of Specified Foreign Financial Assets, has become essential for those who must disclose their holdings to the IRS. Learn how to file form 8594 and when to file.