Tax Must Be Expressly Imposed by Law, Not by Inference or Analogy

“In construing fiscal statutes and in determining the liability of a subject to tax one must have regard to the strict letter of the law. If the revenue satisfies the court that the case falls strictly within the provisions of the law, the subject can be taxed. If, on the other hand, the case is not covered within the four corners of the provisions of the taxing statute, no tax can be imposed by inference or by analogy or by trying to probe into the intentions of the legislature and by considering what was the substance of the matter.”