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The key point in determining the state income tax for a company conducting interstate commerce is how the unitary business concept applies to the computation of taxable income. For example, the apportionment of income between business and nonbusiness income typically depends upon how a state applies the unitary business concept. States also use the unitary business concept to determine the apportionable amount of taxable business income for a corporation conducting an interstate business. Furthermore, many states use the unitary business concept to determine when corporations must file either combined or consolidated tax returns. Individual states have chosen to apply the unitary business …