Summary

Joseph P. Bradley Leloup v. Port of Mobile — Opinion of the Court

Of course, the exaction of a license tax as a condition of doing any particular business is a tax on the occupation; and a tax on the occupation of doing a business is surely a tax on the business. Now, we have decided that communication by telegraph is commerce, as well as in the nature of postal service, and, if carried on between different states, it is commerce among the several states, and directly within the power of regulation conferred upon congress, and free from the control of state regulations, except such as are strictly of a police character.
Source: Wikisource

Joseph P. Bradley Leloup v. Port of Mobile — Opinion of the Court

Can a state prohibit such a company from doing such a business within its jurisdiction, unless it will pay a tax and procure a license for the privilege? If it can, it can exclude such companies, and prohibit the transaction of such business altogether. We are not prepared to say that this can be done. Ordinary occupations are taxed in various ways, and, in most cases, legitimately taxed. But we fail to see how a state can tax a business occupation when it cannot tax the business itself.
Source: Wikisource

Joseph P. Bradley Leloup v. Port of Mobile — Opinion of the Court

In our opinion, such a construction of the constitution leads to the conclusion that no state has the right to lay a tax on interstate commerce in any form, whether by way of duties laid on the transportation of the subjects of that commerce, or on the receipts derived from that transportation, or on the occupation or business of carrying it on, and the reason is that such taxation is a burden on that commerce, and amounts to a regulation of it, which belongs solely to congress.
Source: Wikisource

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