Your Questions About the Code of Federal Regulations, Answered Plainly

There is a set of books in America that governs how you build a deck, label a jar of salsa, haul a trailer and report a payroll. It has more direct power over your daily life than most of the laws Congress passes. It runs to 50 titles. And I would wager that the average American, asked to find a single sentence in it, would not know where to begin.

That is not the citizen's fault. Nobody taught us. So let me do what a good host does, which is take the calls. Here are the questions I would expect from a thoughtful reader, answered plainly. I will tell you what the thing is, how it is arranged, how to read it and how to see what is coming, and I will keep the commentary to the places where it earns its keep.

What it is

What is the Code of Federal Regulations?

The Code of Federal Regulations, usually shortened to the CFR, is the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies. "Codification" means that the rules are collected, organized by subject and kept up to date in one place, instead of being scattered through years of daily notices.

When an agency finishes a rule, that rule has the force of law. The CFR is where you find the rules that are in effect at a given time. A rule that was published in the Federal Register in 2019 and has since been amended will show up in the CFR in its current form, with a note pointing back to the amendments.

How is it different from the U.S. Code?

This is the question that trips up most people, and the difference is the whole point of a republic.

The United States Code is the codification of the statutes, the laws that Congress passes and the President signs. Congress writes it. The Code is organized into titles by subject, and it is maintained by the Office of the Law Revision Counsel of the House of Representatives. When someone says "the law says" and means a statute, they mean the U.S. Code.

The Code of Federal Regulations is the codification of regulations, which are made by agencies under authority that a statute delegates. The executive branch writes it.

An easy way to remember: the U.S. Code is what the people's representatives enacted. The CFR is what the agencies did with it. Both bind you. Only one was voted on by elected legislators. A regulation will name the statute that authorizes it, and you can follow the citation back.

How is it different from the Federal Register?

The Federal Register is the daily journal of the executive branch, published each business day. It carries proposed rules, final rules, notices, presidential documents and meeting announcements. When an agency makes a new rule, the rule first appears in the Federal Register, with a long preamble that explains what the agency is doing and why.

Think of it this way. The Federal Register is the newspaper. The CFR is the reference book that the newspaper's news gets filed into. A final rule is published in the Federal Register, and then the part of the CFR that it changes is amended to match. The Federal Register Act of 1935 created the Register, and the CFR followed, with its first edition published in 1938.

The Federal Register published 3,248 final rules in 2024 and 2,441 in 2025. That is how many times in those years the reference book had to be rewritten.

How it is built and kept current

How is the CFR organized?

It is divided into 50 titles, each representing a broad subject area. Title 12 is banking, Title 21 is food and drugs, Title 29 is labor, Title 40 is the environment, Title 49 is transportation, and so on. A few titles, Title 3 among them, hold special material such as presidential documents.

Each title is divided into chapters, which usually correspond to an agency. Chapters are divided into parts, which cover a single regulatory subject, and parts are divided into sections, the basic unit. Some parts also have subparts, which group sections.

A citation reads like an address, from large to small. If you see "12 CFR 1026.1," that means Title 12, Part 1026, Section 1. Once you know the pattern, a citation tells you where to go before you open the book.

Under each part you will also find an authority citation, which names the statute or statutes that give the agency the power to make that rule. That line is worth reading every time. If the authority is thin, you have found a question to ask.

How often is the CFR revised, and what are the dates?

The CFR is revised in print and online editions once a year, on a staggered schedule so that the work is spread across the calendar. By long practice the revision dates run as follows: titles 1 through 16 are updated as of January 1; titles 17 through 27 as of April 1; titles 28 through 41 as of July 1; and titles 42 through 50 as of October 1. That means the annual edition of any given title carries a stated date, and a rule that changed after that date will not be in that edition.

This matters in a dispute. If you need to know what the rule said on a particular day, you look at the annual edition for the year and then at any amendments published after the revision date. A lawyer would do the same.

What is the eCFR, and can I trust it?

The eCFR, the electronic Code of Federal Regulations, is a continuously updated online version of the CFR. It is maintained by the Office of the Federal Register with the Government Publishing Office, and it is updated as amendments take effect, usually within a short time, so it is far more current than the annual edition.

Here is the caveat that the site itself gives. The eCFR is an editorial compilation. It is designed to be a convenient, current reference, but the official legal text is the annual edition of the CFR published by the Government Publishing Office and the Federal Register documents. For general reading and for finding a rule, the eCFR is what everyone uses. If a legal matter turns on the exact wording on a given date, check the official edition and the Federal Register amendments, and do not rely on the compilation alone.

Finding rules and who wrote them

How do I find a rule on my topic?

There are four ways, from easiest to most careful.

1. Search the eCFR by keyword. Type the subject, such as "cottage food" or "overtime" or "trailer brakes," and you will get a list of parts and sections. Narrow by title if you know the area.
2. Browse by title and agency. If you know the agency that regulates the activity, start with its chapter.
3. Start from the statute. If you know the statute, the U.S. Code section often points to the agency, and the agency's regulations are in the CFR under that statute's authority citation.
4. Search the Federal Register. If the rule is new, the preamble in the Federal Register explains it in plain terms, and it often lists the sections of the CFR that are affected.

A practical tip: read the definitions section of the part first. Many rules turn on how a word is defined. "Employee," "small business" and "waters" mean what the part says they mean.

How do I find out who wrote a rule?

Every rule in the Federal Register carries its provenance on its face. Look at the top of the document. You will see the agency that issued it, the CFR parts it affects, a docket number and a Regulation Identifier Number, usually called an RIN, which follows a rule through its life. Near the top you will also find a heading, "For Further Information Contact," with a name, phone number and email for the agency official who can answer questions. That is a person who works for you.

For the full history of a rule, go to Regulations.gov, the federal site for the public comments. A rule's docket there often contains the proposed rule, the comments the public filed, and supporting documents. The preamble to the final rule is required to respond to the significant comments, and it is one of the best things to read, because that is where the agency has to explain itself.

Seeing what is coming

How do I see which rules are coming?

Twice a year the government publishes the Unified Agenda of Regulatory and Deregulatory Actions, a list of the rules that agencies expect to propose or finalize in the coming months, with the stage each has reached. It is compiled by the Regulatory Information Service Center together with the Office of Information and Regulatory Affairs, which sits in the Office of Management and Budget, and it is searchable at Reginfo.gov. The Agenda comes out in two editions, commonly called the spring and fall agendas.

The Agenda is a forecast, and agencies often slip their dates, but it is the nearest thing to a calendar of future rules. If you run a business or a household that depends on a particular rule, search the Agenda by agency or by topic. You can also see rules under review at the White House through Reginfo.gov. For tools to track pending rules on this site, see the Red Tape page.

Can I comment on a proposed rule, and does it matter?

Yes. Under the Administrative Procedure Act, an agency that proposes a rule must publish notice and give the public a chance to submit written comments before the rule becomes final. You file comments on Regulations.gov by the deadline in the notice. Comments that give specific facts, cost figures and legal arguments carry more weight than form letters, because the agency has to consider the significant ones and respond to them in the final rule, and a rule that ignores a serious comment is more vulnerable in court.

The history of why that process exists is a good story, told in The Administrative Procedure Act of 1946 Was a Truce, and It Still Shows.

Consequences and why it matters

What happens if I break a rule in the CFR?

It depends on the rule and on the statute behind it. Many regulations carry civil penalties, meaning fines, and some can support criminal charges where the statute says so. That is the reason that the authority citation matters. A regulation without statutory backing does not bind you, and a regulation that goes beyond its statute can be challenged. If you think a rule applies to you, or you have received a notice that says you violated one, this is a place for a lawyer, and I am not one. What I can say as a matter of civics is that you have a right to know what the rule says, and the CFR is where you find it.

One wrinkle worth knowing about: the sheer number of federal rules that carry criminal penalties has been a subject of concern for decades, and I have written about the problem in A Fisherman, Some Undersized Grouper and the Problem of Regulatory Crime.

Why does a citizen need to know any of this?

Because the CFR is where much of the law is, and the Constitution says that law should be made by people you elect. Article I, Section 1 vests "All legislative Powers herein granted" in Congress. When the legislative power is carried out by agencies, it is carried out in the pages of the Federal Register and the CFR. Madison warned in Federalist 62 against laws "so voluminous that they cannot be read." The CFR is far too large for anyone to read through in a lifetime of evenings. If you want to see how the count of rules compares with the count of laws, read Agencies Write Thousands of Rules a Year While Congress Passes Hundreds of Laws.

The practical answer is simpler. Knowing how to find a rule in the CFR is as basic to being a self-governing citizen as knowing how to read a ballot. A free people ought to be able to look up the rules it lives under.

Is it true that nobody can read all of it?

Yes. It is, as far as I know, true, and it is one of the funniest things in American government that the people who live under the rules are expected to know them. The CFR is far too large for a person to read start to finish and keep in mind. That is not a joke at the expense of the people who write and update it. It is a criticism of the design. A body of rules that no one can know in full invites selective enforcement, because whoever decides which part to enforce holds the power. I would go further and say that a rule you cannot find is not much of a rule. The reform conversation, the one about regulatory budgets, sunsets and congressional votes, begins with that point. See A Regulatory Budget Would Make Washington Count the Cost of Its Rules.

What is the quickest way to get started?

Pick one thing in your life that is regulated. A business license, a vehicle, a workplace, a product you sell, a program you rely on. Find the agency, find its chapter in the CFR through the eCFR, read the definitions, read the authority citation, and open the Unified Agenda to see whether a change is coming. Then, if you care about it, comment. That is twenty minutes, and it will teach you more about how Washington works than a month of cable news.

The case in brief

1. The U.S. Code is the statutes Congress passed; the CFR is the regulations that agencies wrote under those statutes; the Federal Register is the daily journal in which rules first appear.
2. The CFR has 50 titles, broken into chapters, parts and sections, and it is revised annually on a staggered schedule: January 1, April 1, July 1 and October 1.
3. The eCFR is the current, searchable, unofficial compilation, and the annual edition and the Federal Register are the official text.
4. A rule's preamble, docket and RIN tell you who wrote it and why, and the Unified Agenda shows what is coming.
5. A citizen who can find and comment on a rule is exercising the self-government the Constitution promised.

What you can do: Choose one regulated activity in your own life, find its part in the eCFR, read the authority citation, and check the Red Tape page for pending changes.