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.This form provides the IRS with a detailed breakdown of how the purchase price is allocated across different asset categories. Enter your name and taxpayer identification number (TIN) at the top of the form. Then check the box for Purchaser or Seller. Which forms are you looking for? Please make a selection: Divorce, Paternity. The IRS requires both the buyer and seller to submit Form 8594, which outlines the purchase price allocation. 1. Gather necessary documentation for the asset sale. Asset Acquisition Statement Under Section 1060 â–·Attach to your income tax return.