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. Line 1: Enter the name, address, and Tax Identification Number (TIN) of the other party (either the purchaser or seller). An identical copy of the filledin. The buyer and seller agree on and report the same purchase price allocation to tax authorities (IRS form 8594).