A taxpayer that is a member of an affiliated group of corporations which files a consolidated federal income tax return shall determine its deduction for or its gross income in respect of federal income taxes paid or accrued during the income period to the United States as if it and all other members of the affiliated group of which it was a member had filed separate federal income tax returns for all relevant taxable years.
§ 148.045, RSMo
Effective 5/15/1986