Summary

Rufus Wheeler Peckham Indiana Manufacturing Company v…

It has long been the settled doctrine of the Federal courts that the mere illegality of a tax, or the mere fact that a law upon which the tax is founded is unconstitutional, does not entitle a party to relief by injunction against proceedings under the law, but it must appear that the party has no adequate remedy by the ordinary processes of the law, or that the case falls under some other recognized head of equity jurisdiction, such as multiplicity of suits, irreparable injury, etc.
Source: Wikisource

Rufus Wheeler Peckham Indiana Manufacturing Company v…

Whether the value of letters patent is in any way taxable by or under state authority, we have no occasion to now decide, because the question is not before us. We simply show a plain and adequate remedy at law, after paying the tax, to recover it back, in an action or proceeding where the question as to the exemption of this kind of property from taxation can be raised, and if not admitted by the state court, it can be reviewed here on writ of error.
Source: Wikisource

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