Definition
Article XVI refers to the Sixteenth Amendment to the United States Constitution, ratified in 1913, which grants Congress the 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. The amendment overrode the Supreme Court's 1895 decision in Pollock v. Farmers' Loan & Trust Co., which had held that a federal income tax on certain income constituted a direct tax requiring apportionment under Article I, Sections 2 and 9 of the Constitution. By removing the apportionment requirement for income taxes specifically, Article XVI forms the constitutional foundation for the entire modern federal income tax system.
Note on usage: "Article XVI" as a designation is context-dependent. In constitutional scholarship and legal research, the Sixteenth Amendment is rarely styled "Article XVI" — it is almost universally cited as the Sixteenth Amendment. "Article XVI" as a label is more commonly encountered in state constitutions, treaties, codes, contracts, corporate bylaws, or uniform acts, where it denotes the sixteenth numbered article of that particular document. Researchers should always confirm the governing document before assuming this designation refers to the federal income tax amendment.
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Common Confusion
Because "Article XVI" is a positional label rather than a proper name, it can refer to an enormous range of legal provisions depending on context. In federal constitutional law, Article XVI almost invariably means the Sixteenth Amendment (income tax). In military law, Article 16 of the Uniform Code of Military Justice (UCMJ) governs the composition of courts-martial. In state constitutional law, Article XVI varies by state and may address subjects ranging from public officers to taxation to municipal debt. In international agreements, Article XVI may define withdrawal procedures, dispute resolution, or other treaty-specific terms. Researchers must anchor the term to its source document before proceeding with any analysis or corpus search.
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Why It Matters in Research
The core research challenge with "Article XVI" is disambiguation. Because it is a structural label, not a substantive title, its meaning is entirely document-dependent. Several traps await the inattentive researcher:
Historical source ambiguity: Bouvier's entry reproduces the text of what became the Sixteenth Amendment verbatim, without explaining that Bouvier's was likely written or revised around the time of ratification (1913) and that the constitutional provision it quotes was then novel. Researchers relying on pre-1913 editions of Bouvier's will find no entry for this provision at all — it did not exist.
Apportionment doctrine: The significance of Article XVI (Sixteenth Amendment) cannot be understood without understanding the apportionment rules it modified. The amendment did not repeal Article I's direct tax provisions wholesale; it carved out income taxes as an exception. Tax law scholarship and constitutional litigation have long debated the precise boundaries of what counts as "income" within the amendment's scope — a live issue in the corpus.
State constitutional variants: Many state constitutions contain an Article XVI that deals with entirely different subject matter. Texas Article XVI covers general provisions; California Article XVI addresses public finance. Corpus searches on "Article XVI" in state law databases will return heterogeneous results that require document-level sorting.
Military law intersection: Article 16 of the UCMJ (not "Article XVI" in roman numerals, but the same positional provision) addresses court-martial composition and has been subject to significant amendment. Researchers in military law should consult the encyclopedia entry below, which treats UCMJ punitive articles in detail.
Treaty and contract contexts: In transactional and international law research, "Article XVI" in a contract or treaty is simply the sixteenth numbered provision of that instrument. No general doctrine attaches to the label itself.
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Historical Dictionary Support
Bouvier's Law Dictionary reproduces the text of the Sixteenth Amendment without additional commentary, framing it as a direct constitutional provision. This approach is consistent with Bouvier's practice for constitutional text: recite the language, let the document speak. The entry provides no analysis of the Pollock decision, no discussion of the ratification debates, and no treatment of what "income" encompasses — all of which were hotly contested at the time of Bouvier's revision.
What Bouvier's misses, by design: the historical dictionaries of this era treat constitutional provisions as fixed text rather than as evolving doctrine. The Sixteenth Amendment has since generated a vast body of statutory and regulatory law (the Internal Revenue Code) and a substantial body of constitutional litigation over the meaning of "income from whatever source derived." Researchers seeking interpretive history will find Bouvier's a starting point for the text only, not for doctrine.
No meaningful divergence among historical dictionary sources exists here because Bouvier's is the sole source for this entry and the text it quotes is the constitutional provision itself — not a definition subject to editorial variation.
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Jurisdictional Note
As a federal constitutional provision, the Sixteenth Amendment applies uniformly across all states and is not subject to state-law variation. However, state income tax systems frequently incorporate or reference federal income tax concepts by statute, meaning that the scope of "income" under Article XVI has indirect but substantial effects on state tax law across jurisdictions.
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Encyclopedia Cross-Reference
UCMJ Offenses — Punitive Articles, General Article (Article 134), and Military-Specific Crimes (The Law Mind Military, Veterans & Admiralty Law Encyclopedia) — relevant for researchers who encounter "Article XVI" or "Article 16" in a military justice context, where the reference is to court-martial composition under the UCMJ rather than to the federal income tax amendment.
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