Government agencies publish two very different kinds of document, and they are easy to confuse. One is binding law; the other explains how the agency reads the law it already has.
Regulations carry the force of law
A regulation is issued under authority a statute granted, follows a prescribed procedure, and once final it binds the public in the same way a statute does.
Violating it can trigger penalties, and the agency does not need a separate act of the legislature to enforce it. The rule itself is the enforceable text.
Because it binds, it also has to survive scrutiny: courts can vacate a rule that exceeded the agency's authority or was adopted without the required steps.
Guidance explains rather than commands
Guidance documents describe how an agency understands an existing rule, what evidence it looks for, or how it intends to prioritise its enforcement resources.
Formally, guidance binds nobody. It can be issued quickly, without notice and comment, and withdrawn just as quickly when circumstances or leadership change.
That speed is the reason agencies rely on it heavily, particularly in areas where technology moves faster than the rulemaking process can follow.
The practical line is blurrier than the legal one
A regulated firm reading guidance knows the agency will apply that interpretation in an inspection. Ignoring it is legally permissible and commercially unwise.
This gives guidance real-world weight that its formal status does not describe, and it is the source of most complaints about agencies legislating without procedure.
Courts have repeatedly had to decide whether a particular document was genuinely explanatory or was a rule wearing a different label.
The tests courts tend to apply
Judges generally look at whether the document leaves the agency discretion, whether it creates new obligations, and whether the agency treats departures from it as violations.
A document that says compliance will be assessed against a specific numerical threshold, when no rule contains that threshold, is vulnerable to being reclassified.
Why the distinction matters to readers
News coverage often reports guidance as though a new rule had been made. The difference matters because guidance can be reversed within weeks by the next administration.
A binding rule, by contrast, requires a full repeal process and can be defended in court by whoever benefits from it. Its durability is structurally different.
Checking which category a document falls into is usually the fastest way to judge how much a policy announcement will actually change.