Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. 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.Filing Requirements: File Form ST9 (for goods) or Form STS (for services) electronically monthly, quarterly, or annually based on sales volume. Use a Business Bill of Sale to set out the terms for the sale of a business and transfer the ownership and all assets to the buyer.