William D. Guthrie, Magna Carta, and Other Addresses
“ There is no doubt that any state may levy income taxes. Nor is there any doubt that, under the federal Constitution as it now stands, Congress may levy an income tax provided it be apportioned according to population as required in regard to all direct federal taxes. There is also no doubt that Congress, by means of an excise tax, may reach income derived from any business or profession, and that any such tax, being essentially an excise tax on business, need not be apportioned but need merely be uniform throughout the United States. ”
