The canon against surplusage is a rule of statutory interpretation that tells courts to read a law so that every word does some independent work. When two possible readings are on the table, the one that leaves no term redundant wins over the one that treats any term as filler. The U.S. Supreme Court has called it a “cardinal rule” of statutory construction, and it shapes how judges resolve ambiguity in federal and state statutes alike.
The Core Presumption
Legislatures are presumed not to waste words. When Congress or a state legislature writes a statute, courts start from the assumption that every word, clause, and phrase was chosen to do something no other word in the statute already does. If a proposed interpretation would leave a term with nothing to contribute, that is treated as a signal the interpretation is wrong. The Supreme Court traced the principle back to Bacon’s Abridgment in Duncan v. Walker, quoting the rule that a statute should “be so construed that, if it can be prevented, no clause, sentence, or word shall be superfluous, void, or insignificant.”1Cornell Law Institute. Duncan v. Walker – Supreme Court
The idea is sometimes captured in the Latin phrase verba cum effectu sunt accipienda: words should be understood as having effect. The presumption runs strongest when a proposed reading would make another part of the same statutory scheme superfluous, and weaker when the overlapping provisions sit in different statutes or different areas of law.2Cornell Law Institute. Marx v. General Revenue Corp – Supreme Court
How Courts Give Each Word Its Own Job
When two different words appear in the same statutory sentence, courts try to find a definition for each that does not fully overlap with the other. In Hibbs v. Winn, the Supreme Court looked at the Tax Injunction Act’s reference to “assessment,” “levy,” and “collection.” If “assessment” alone covered the entire taxing process, “levy” and “collection” would have no reason to exist in the statute. Because each term could describe a distinct phase of tax enforcement, the Court read them as doing exactly that.3Cornell Law Institute. Hibbs v. Winn – Supreme Court
The same logic runs through every level of a statute’s text. If a provision uses both “buildings” and “structures,” a court will try to define “structures” to reach things that are not buildings, like fences, towers, or docks. The legislature already had the word “buildings” available; adding “structures” is presumed to be a deliberate reach for something more. Collapsing the two into a single meaning would erase that choice.
Lists and Catch-All Phrases
The canon matters most when a statute includes a detailed list followed by a broad catch-all. If a law regulates “cars, trucks, and other motorized vehicles,” the surplusage principle prevents the catch-all from being read so broadly that naming “cars” and “trucks” separately becomes pointless. The specific items have to keep meaning beyond what the general term already covers, which forces courts to treat the specific entries as meaningful markers of what the legislature had in mind rather than throwaway examples.
Key Supreme Court Decisions
Duncan v. Walker (2001)
This decision gave the canon real force. The question was whether a federal habeas corpus petition counted as an “application for State post-conviction or other collateral review” under the federal habeas statute, which would pause the filing deadline. The Court said no. If the phrase covered both state and federal petitions, the word “State” would do no meaningful work in the sentence. The Court described a duty to “give each word some operative effect” and refused to read “State” out of the provision when a reading that preserved its function was available.1Cornell Law Institute. Duncan v. Walker – Supreme Court
Marx v. General Revenue Corp. (2013)
Where Duncan strengthened the canon, Marx mapped its limits. The Court said the canon “assists only where a competing interpretation gives effect to every clause and word of a statute.” When no available reading eliminates all redundancy, the canon loses much of its force. The Court also observed that redundancy is “hardly unusual” in statutes addressing costs, acknowledging that certain areas of legislation are simply more repetitive. And the canon is strongest when the competing provisions sit within the same statutory scheme; when the overlapping language comes from two different sources, courts should be less troubled by the duplication.2Cornell Law Institute. Marx v. General Revenue Corp – Supreme Court
United States Postal Service v. Konan (2026)
The Court’s most recent word on the canon came in February 2026. The case involved the Federal Tort Claims Act’s exception for claims “arising out of the loss, miscarriage, or negligent transmission of letters or postal matter.” The respondent argued that the Court’s reading of “miscarriage” overlapped too much with “loss.” The Court rejected the argument, declaring that the canon against surplusage “is subordinate to the cardinal canon” that a legislature says what it means and means what it says. Congress, the Court reasoned, likely used “broad, overlapping terms” on purpose to keep mail-delivery complaints out of court. The decision reinforced that the canon is a presumption, not a trump card, and gives way when treating terms as partially overlapping is the most natural reading.4Supreme Court of the United States. United States Postal Service v. Konan
When the Canon Yields
Legal Doublets
The English legal tradition is full of paired phrases that say essentially the same thing twice: “null and void,” “cease and desist,” “free and clear,” “arbitrary and capricious.” Courts generally do not try to pry apart each half of a doublet and assign it independent meaning. The Sixth Circuit confirmed this in Doe v. Boland, holding that the presumption against surplusage does not apply to these “meaning-reinforcing redundancies.”5Iowa Law Review. The Belt-and-Suspenders Canon The pairing is treated as a single unit.
Belt-and-Suspenders Drafting
Legislatures also repeat themselves on purpose. Lawmakers may include overlapping language out of caution, wanting to foreclose every possible loophole even at the cost of some redundancy. Other times, repetition is the price of political compromise, where one faction insists on specific language as a condition of support even when existing text already covers the ground. Scholars have proposed a “belt-and-suspenders canon” that asks courts to look at the legislative history and context before assuming that duplicative language has to mean different things.5Iowa Law Review. The Belt-and-Suspenders Canon
The Congressional Research Service puts the point generally: any of the standard interpretive canons “may give way if context points toward a contrary meaning.”6EveryCRSReport.com. Statutory Interpretation: General Principles and Recent Trends
How It Interacts With Other Canons
The surplusage canon does not operate alone. It is one of a family of textual canons that courts use when parsing statutory language, and these canons sometimes pull in different directions. Two come up most often alongside it:
- Ejusdem generis. When a statute lists specific items followed by a general term (“cars, trucks, and other vehicles”), the general term is limited to things similar to the specific ones. This canon and the surplusage canon often work together, since both prevent a catch-all from swallowing the specific items. They can also conflict: ejusdem generis narrows the general term, while the surplusage canon might demand that the general term retain some independent scope beyond the specific list.
- Noscitur a sociis. A word is known by the company it keeps, so ambiguous terms are interpreted based on the surrounding words. This can reinforce or undercut the surplusage canon depending on whether the neighboring terms suggest overlap or distinction.
There is no master hierarchy that resolves every conflict. The surplusage principle is a presumption, not a rule of law, and it yields when competing principles point more convincingly in another direction. As Konan made clear, the plain meaning canon sits above the surplusage canon when the two collide. If the most natural reading of a statute produces some redundancy, courts will accept the redundancy rather than twist the language into an unnatural shape just to give every word a unique job.4Supreme Court of the United States. United States Postal Service v. Konan
Beyond Statutes: Private Contracts
The surplusage principle is not limited to legislation. Courts regularly apply it when interpreting contracts, insurance policies, wills, and other legal documents. The reasoning is the same: if the parties included a particular word or clause, they presumably meant it to do something. A study in the Fordham Law Review found that textual canons like the surplusage rule, though most often discussed in the statutory context, are routinely deployed in contract disputes as well.7Fordham Law Review. The Textual Canons in Contract Cases: A Preliminary Study
In contract disputes, the canon works as a default: if one interpretation renders a clause meaningless while another gives it independent effect, courts favor the reading that keeps the clause alive. This matters most in insurance coverage fights, commercial leases, and employment agreements where parties negotiate specific terms at length. If you included a carve-out, a court is unlikely to read the rest of the agreement in a way that erases it.
Why the Canon Has Critics
The main critique is that the canon assumes legislatures draft with watchmaker precision. Statutory language is often the product of committee markups, floor amendments, time pressure, and multiple authors, which may credit the drafting process with more coherence than it actually has. The Supreme Court itself has acknowledged as much, noting in Marx that redundancy is “hardly unusual” in certain types of legislation.2Cornell Law Institute. Marx v. General Revenue Corp – Supreme Court
There is also the problem of strategic deployment. Because the canon is a presumption rather than a binding rule, litigants invoke it when it helps and dismiss it when it does not. A party arguing for a narrow reading will lean on the surplusage canon to insist that each word limits the statute’s reach; the opposing party will point to plain meaning or legislative history to argue that some overlap is natural. Courts weigh these competing frameworks case by case, which means the canon’s influence depends on how persuasive the surrounding arguments are. It is a strong starting point, not an ending point.