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. ”
