“Now, the cardinal consideration in my judgment is that the income tax is only one tax, a tax on the income of the person whom it is sought to assess, and that the different schedules are the modes in which the statute directs this to be levied. In other words, there are not five taxes which you might call income tax A,B,C,D and E, but only one tax. That tax is to be levied on the income of the individual whom it is proposed to assess, but then you have to consider the nature, the constituent parts, of his income to see which Schedule you are to apply” .(439 and see 441)”
“Schedule D. The said last-mentioned duties shall extend to every description of property or profits which shall not be contained in either of the said Schedules (A.), (B.) , or (C.) and to every description of employment of profit not contained in Schedule E. My Lords, nothing could be clearer to indicate that the schedules are mutually exclusive; that the specific income must be assessed under the specific schedule; and that D is a residual Schedule… Moreover, the dominance of each Schedule A, B, C and E over its own subject-matter is confirmed by reference to the sections and rules which respectively regulate them in the Act of 1842 (455)”
“The question is one of substance and not form.”
“Whether the statute is concerned with a single step or a broader view of the acts of the parties depends upon the construction of the language in its context”