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 an Internal Revenue Service (IRS) form that provides a structured way to allocate the purchase price of a business among different asset classes. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. The Cumulative Bulletin (C. B.) is composed of reprints of the weekly Internal Revenue Bulletins (I.