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 IRS developed Form 8594 for buyers and sellers to disclose how the purchase price is allocated among different classes of assets. Did you buy or sell a business during the tax year? If so, you may need to file IRS Form 8594 with your federal tax return. Portal for filling out and submitting Business Personal Property Listings and Extensions. Taxscribe tutorial .