Both the seller and purchaser of a group of assets that makes up a trade or business must use Form 8594 to report such a sale. You will need to allocate the amount reflected on form 8594 among all the assets.A typical method is to allocate the proceeds based on the original cost. When to file and pay - Returns must be filed or postmarked on or before the 20th day of the month following the end of each reporting period. Use Form 4797 to report: The sale or exchange of property. The involuntary conversion of property and capital assets. Conversely, generally an asset sale will be taxable to the selling business in all states the business operates in and has income tax nexus. This application must be filed at least 20 days before either taking possession of the business assets or paying for them, whichever comes first. The amount of tax that you will ultimately have to pay depends upon whether the money you make from the sale is taxed as ordinary income or capital gains.