Both the seller and purchaser of a group of assets that makes up a trade or business must use Form 8594 to report such a sale. 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. â–¶ Attach to your income tax return. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. Form 8594 is an Internal Revenue Service (IRS) form that provides a structured way to allocate the purchase price of a business among different asset classes.