Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. 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. The burden for this requirement is reflected in the burden of Form 8594. Allocating the Purchase Price. IRS Form 8594 only requires a breakdown of asset value into seven categories, designated as "Classes I through VII.