Summary

Portrait of Hugo Black Hugo Black Capitol Greyhound Lines v. Brice…

Systems of taxation need not achieve the ideal. But the fact that the Constitution does not demand pure reason and is satisfied by practical reason does not justify unreason. Though a State may levy a tax based upon the privilege granted, as distinguished from its exercise, this does not sanction a tax the measure of which has no reasonable relation to the privilege. Reason precludes the notion that a tax for a privilege may disregard the absence of a nexus between privilege and tax. Our decisions reflect that reason. A State naturally may deem factors of size or weight to be relevant.
Source: Wikisource

Portrait of Hugo Black Hugo Black Capitol Greyhound Lines v. Brice…

Giving the State court's judgment every indulgence for supporting its validity, one cannot find any fair relationship between the tax and actual road use or the privilege of such use. The value of a vehicle is not a practical function of what the State affords. It has at best a most tenuous relationship to the privilege of using the roads, since differences in value are due to a vehicle's appointments or its age or to other factors which have no bearing on highway use.
Source: Wikisource

Portrait of Hugo Black Hugo Black Capitol Greyhound Lines v. Brice…

For the tax is exacted not only on the original purchase of the vehicle but upon its subsequent transfer to a new owner. If the tax be treated as one on the vehicle, then it is attributable not to the privilege of road use but to a shift in its ownership. If the tax is deemed to be upon the owner, then it depends not upon the privilege of road use but upon the frequency of turnover of his equipment. Unlike all the comparable taxes heretofore sustained, the Maryland tax is measured by considerations extraneous to the State's right to impose it.
Source: Wikisource

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