Summary

Portrait of Morrison Waite Morrison Waite Antoni v. Greenhow — Opinion of the Court

Promptness in the payment of taxes by the citizen is as important as promptness by the state in the discharge of its own obligations. In fact, ordinarily, the last cannot be done without the first. Hence, under the revenue system of the United States, the collection of the revenue in the manner prescribed by law cannot be restrained by judicial proceedings. The only remedy for an illegal exaction is payment under protest and suit to recover back the money paid.
Source: Wikisource

Portrait of Morrison Waite Morrison Waite Antoni v. Greenhow — Opinion of the Court

The primary obligation of the state is for the payment of the coupons. All else is simply as a means to that end. It matters not whether the coupons have been refused for the taxes, if full payment of the amount they call for is actually made in money. A remedy, therefore, which is ample for the enforcement of the payment of the money is ample for all the purposes of the contract.
Source: Wikisource

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