Summary

Pierce Butler Coolidge v. Long — Opinion of the Court

This is to deny to the commonwealth the power to distinguish, in laying its tax, between the vesting of a defeasible future interest which carries to the beneficiary no assurance of future possession or enjoyment and the later vesting of that interest by death in possession and enjoyment of the tangible property, without possibility of being divested. It is to assert that the succession is so complete upon the mere creation of the future interest that the state must tax the future estate when that interest comes into being, or thereafter abstain entirely from taxing it.
Source: Wikisource

Pierce Butler Coolidge v. Long — Opinion of the Court

In short, it is evident from the authorities cited, and many more which might be quoted, that the power to tax property, or a right or a status, or a privilege, acquired or enjoyed by virtue of a contract, is no wise him dered or impeded by the fact of the existend of the contract whether it antedates or follows the effective date of the taxing act. No exercise of a governmental power, whether it be that of taxation, police, or eminent domain, though it make less valuable the fruits of a private contract, can be said to impair the obligation thereof.
Source: Wikisource

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