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.According to section 1060 of the Internal Revenue Code, the IRS requires that you fill out and file Form 8594 when you're buying or selling a business. Only one copy of Form 8594 is allowed to be e-filed per return. To file multiple copies, you will need to manually complete the additional copies.