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.Allocating the purchase price in a business acquisition can be complex. Form 8594 is a tax document required in certain business sales where the buyer acquires assets rather than stock or equity. HOMESTEAD EXEMPTION - How do I file a "Notice of Homestead" to protect myself from creditors? Did you buy or sell a business during the tax year? If so, you may need to file IRS Form 8594 with your federal tax return. Click below to get started.