New Optional Single Sales Factor Apportionment Method
House Bill 128 was passed by the general assembly in the 2013 regular session, and it was signed into law by Governor Nixon on July 12, 2013. House Bill 128 provides that an eligible corporation may elect to use the new optional single sales factor apportionment method to compute its Missouri corporate taxable income from sources in this state on its original income tax return. The election to use the new apportionment method is available for any original income tax return that is filed on or after August 28, 2013, regardless of the taxable year for which the original income tax return is being filed.
This election is not available for any income tax return that was filed on or before August 27, 2013. It is also not available for amended returns as once an apportionment method election has been made, it cannot be changed with respect to the same taxable period.