How to Read a Statute (2026) | Federal & State Law

Statutes use a hierarchy of structural units, a vocabulary of authority words, and cross-references that link them to defined terms, other statutes, and regulations. Once you can see the structure, statutes become much easier to parse.

The structural hierarchy

Federal statutes are arranged into Titles → Subtitles → Chapters → Subchapters → Parts → Sections → Subsections → Paragraphs → Subparagraphs → Clauses.

Not every statute uses every level. A typical citation hits at the section level: 42 U.S.C. § 1983. To find a specific provision within a section, you append the subdivisions:

42 U.S.C. § 12112(b)(5)(A) means: Title 42, Section 12112, subsection (b), paragraph (5), subparagraph (A).

Read the defined-terms section first

Every chapter or subchapter typically has a "definitions" section. Read it before reading the operative provision. Defined terms often have specialized meanings that depart from ordinary English.

Example: in Title VII employment discrimination, "employer" means a person engaged in an industry affecting commerce who has 15 or more employees for 20 or more calendar weeks. Without the definition, you cannot answer who the statute covers.

Words of authority

Words of authority do the work of the statute. Common ones:

shall— mandatory; the subject is required to perform the action. Some modern drafting guides discourage "shall" for ambiguity, but it remains pervasive.
must— mandatory; preferred for clarity in modern drafting.
may— discretionary; the subject is permitted but not required.
may not / shall not— prohibitive; the subject is forbidden from performing the action.
is entitled to— creates a substantive right.
is the duty of— creates an obligation.

Cross-references

Statutes frequently reference other statutes, regulations, or their own definitions. Watch for:

"as defined in section X"— you must consult the referenced section to apply the operative provision.
"notwithstanding any other provision of this title" — signals that the immediate provision overrides conflicting earlier ones.
"subject to subsection (X)"— signals that the immediate provision is qualified by another.
"under regulations promulgated by the Secretary" — tells you to look in the CFR for the implementing rule.

Statutory text vs. legislative history

The codified text is what binds. Legislative history (committee reports, floor statements, conference reports) can illuminate ambiguity but does not change what the statute says. Courts vary in how much weight they give legislative history; textualists give it very little.

Effective dates and amendments

A statute reflects the latest amendments only after the codifier has processed the Public Law. For very recent enactments, the codified version may lag; consult Congress.gov for the slip-law text and effective date.

Statutory annotations (in services like USCS or USCA) provide additional context — cases interpreting the section, prior versions, and notes. The free Cornell LII edition includes Public Law citations in the section notes.

A worked example

42 U.S.C. § 1983reads (in part): "Every person who, under color of any statute, ordinance, regulation, custom, or usage, of any State or Territory or the District of Columbia, subjects, or causes to be subjected, any citizen of the United States or other person within the jurisdiction thereof to the deprivation of any rights, privileges, or immunities secured by the Constitution and laws, shall be liable to the party injured in an action at law, suit in equity, or other proper proceeding for redress[.]"

Subject: every person; action: subjects or causes to be subjected; under color of: state law (key defined doctrine); deprivation of: federal rights; consequence: liability to the party injured; remedies: action at law, suit in equity, or other proper proceeding.

How to Read a Statute