Generally, both the purchaser and seller must file Form 8594 and attach it to their income tax returns (Forms 1040, 1041,. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity.33.4 Buyer and Seller agree to complete, sign and submit the appropriate IRS Rev. Form 8594 for this transaction. Further, the parties should agree to file a supplemental Form 8594 to reflect any such increase or decrease. This form gets filed with your tax return and the buyer and seller must agree on how the purchase price is allocated.