Summary

Portrait of Charles Evans Whittaker Charles Evans Whittaker Northwestern States Portland Cement Company v…

Direct taxation of 'exclusively interstate commerce' is a substantial regulation of it and, therefore, in the absence of congressional consent, the States may not directly tax it. This Court has so held every time the question has been presented here until today. Without congressional consent, the States of Minnesota and Georgia have laid taxes directly on what they admit was 'exclusively interstate commerce.' Hence, in my view, those levies plainly violated the Commerce Clause of the Constitution and cannot stand consistently therewith and with our prior cases.
Source: Wikisource

Portrait of Charles Evans Whittaker Charles Evans Whittaker Northwestern States Portland Cement Company v…

So if anything is plain it is that we are not presented with cases involving the doing of any intrastate commerce in Minnesota or Georgia by the taxpayers. The courts of those States have expressly found that there was none. Therefore, we do not have a situation where a taxpayer was doing both intrastate and interstate commerce within the taxing State, thus to invoke application of the State's apportionment statute in order to determine how much of the total income of the taxpayer had derived from intrastate commerce in the taxing State, and was, therefore, subject to its taxing power.
Source: Wikisource

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