Thesis
Does the federal income tax align with the original taxing framework set out in Article I, or does it rely on judicial interpretation that arrived more than a century later?
01 The Original Framework
Article I, § 8, cl. 1 grants Congress power to lay four categories of tax.
A person, an article, a transaction, or a state-granted privilege.
I
Direct Taxes
Laid directly on persons or property. Must be apportioned among the States by population (Art. I, § 9).
II
Duties
Imposed on specific transactions — most often the importation of goods.
III
Imposts
Charges on imported articles as they cross the national border.
IV
Excises
Taxes on the manufacture, sale, or use of enumerated articles of consumption, or on state-granted privileges.
Hamilton, Federalist No. 36: indirect taxes are “duties and excises on articles of consumption.”
02 Key Observation
0
There are no appearances of the word “income” in the founding record
The U.S. Constitution
as ratified 1788
Madison's Notes on the Debates
Federal Convention, publ. 1840
The Federalist Papers
Hamilton, Madison, Jay — 1787–88
Ratification debates
all thirteen state conventions
Hamilton, Federalist No. 36
indirect taxes = “duties and excises on articles of consumption”
The absence is structural, not oversight. Article I, § 9 requires direct taxes to be apportioned by population — a rule incompatible with any non-apportioned tax on income. The Framers built federal revenue around consumption and trade (indirect, self-limiting) rather than personal extraction.
03 The Text Itself
The Sixteenth Amendment, ratified 3 February 1913. Forty-seven words. Below — the Amendment in full, and the single operative clause that carries the whole argument.
Verbatim
“The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration.”
U.S. Const., amend. XVI · ratified 3 February 1913
The operative clause
Apportionment — the governing rule of direct tax.
Without this, the only class of taxation remaining is indirect.
The Amendment removes apportionment — it does not create a new category of tax. What is left is an indirect tax, which by definition must attach to a transaction, an article, or a state-granted privilege. This is the doctrinal ground on which Brushaber was decided.
04 Judicial Doctrine
The Supreme Court has upheld income taxation under the Sixteenth Amendment for over a century, defining “income” broadly as accessions to wealth. Three cases carry most of the doctrinal weight.
CASE
CASE
CASE
Brushaber v. Union Pacific R.R. Co.
240 U.S. 1 (1916)
Sixteenth Amendment conferred “no new power of taxation” — it relieved income taxes of apportionment to the extent they were already indirect.
Eisner v. Macomber
252 U.S. 189 (1920)
Defined “income” as “gain derived from capital, from labor, or from both combined.”
Commissioner v. Glenshaw Glass Co.
348 U.S. 426 (1955)
Expanded “income” to “undeniable accessions to wealth, clearly realized, over which the taxpayer has complete dominion.”
One hundred years of case law foreclose the judicial path. The remaining question is political.
05 Constitutional Tension
Original Structure & Emphasized Limits
Enumerated powers. Apportionment as a brake on direct taxation. Revenue drawn from consumption and trade. The federal government is held at arm's length from the individual earner by design.
Modern Doctrine & Flexibility
“Accessions to wealth” as the operative definition of income. Annual individual returns. Automatic withholding. A federal tax architecture that reaches every earning American, every pay period.
06 The Question
Should constitutional meaning follow original design, or evolving interpretation?
This is not a question courts have been willing to revisit. It is a question for scholars, citizens, legislatures, and — if the evidence warrants — state conventions acting under Article V's second clause, on the precedent of the Twenty-First Amendment (1933), which repealed the Eighteenth by the same mechanism.