Summary

William Strong Murray v. Charleston — Opinion of the Court

That cannot be, because if it could, the contract (in the language of Alexander Hamilton) would 'involve two contradictory things: an obligation to do, and a right not to do; an obligation to pay a certain sum, and a right to retain it in the shape of a tax. It is against the rules, both of law and of reason, to admit by implication in the construction of a contract a principle which goes in destruction of it.' The truth is, States and cities, when they borrow money and contract to repay it with interest, are not acting as sovereignties. They come down to the level of ordinary individuals.
Source: Wikisource

William Strong Murray v. Charleston — Opinion of the Court

A promise to pay, with a reserved right to deny or change the effect of the promise, is an absurdity.
Is, then, property, which consists in the promise of a State, or of a municipality of a State, beyond the reach of taxation? We do not affirm that it is. A State may undoubtedly tax any of its creditors within its jurisdiction for the debt due to him, and regulate the amount of the tax by the rate of interest the debt bears, if its promise be left unchanged. A tax thus laid impairs no obligation assumed. It leaves the contract untouched.
Source: Wikisource

William Strong Murray v. Charleston — Opinion of the Court

It is a law which interferes between the company and the bondholder, and, under the pretence of levying a tax, commands the company to withhold a portion of the stipulated interest and pay it over to the State. It is a law which thus impairs the obligation of the contract between the parties. The obligation of a contract depends upon its terms and the means which the law in existence at the time affords for its enforcement. A law which alters the terms of a contract, by imposing new conditions, or dispensing with those expressed, is a law which impairs its obligation
Source: Wikisource

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