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. 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. Learn how to file form 8594 and when to file. Form 8883 generally serves the same purpose as Form 8594, Asset Acquisition Statement.