Fundamentals

What Limits Legislative Power and Why a Majority Cannot Decide Everything

By Daniel Sardá · Published on June 08, 2026 · Updated on June 11, 2026

6 min read1,265 words

Legislatures can make and amend laws, but they must still respect the Constitution, rights, their competences, and the required procedure.

The legislative branch has a decisive function: turning collective decisions into general rules. But representing the citizenry or holding a parliamentary majority does not authorize it to approve any content in any way. In a constitutional government, the legislature is also subject to higher rules.

Limits on the legislature are the restrictions that determine what it may regulate, how it must do so, and what content it may not impose. Some protect rights; others distribute competences or require a specific procedure. Taken together, they prevent a temporary majority from turning every political preference into a valid law.

Key idea: a majority may have democratic authority to legislate without having constitutional authority to decide everything.

Why the legislature needs limits

Law is usually associated with order, generality, and democratic legitimacy. But a rule approved by a parliament can also be arbitrary. It could discriminate without justification, restrict protected freedoms, invade another branch’s functions, or be passed while bypassing mandatory deliberation.

That is why constitutionalism does not stop at asking who got more votes. It also asks whether the institution acted within its powers, followed the rules for making law, and kept its content within the constitutional framework.

These limits serve several functions at once. They protect individuals from majority power, preserve the institutional distribution of responsibilities, and make outcomes more predictable. They also help distinguish between a policy that is politically debatable and one that is legally invalid.

That distinction matters. Not every bad public policy violates the Constitution. Many decisions must be corrected through deliberation, elections, or legislative reform. Constitutional limits come into play when a decision crosses a higher legal boundary, not merely when it triggers disagreement.

Three types of limits on legislative power

Although each constitutional system organizes its institutions differently, limits on the legislature can be understood through three main categories: material, formal or procedural, and competence-based.

Material limits: what a law cannot do

Material limits concern the content of legislation. A law may have been properly approved by the competent body and still be incompatible with constitutional rights, principles, or prohibitions.

A hypothetical example would be a rule that bans expressing a specific political opinion simply because it bothers the government. Even if it won broad support, a constitutional question would still remain about its impact on freedom of expression.

Individual rights are therefore among the most important material limits. That does not mean every regulation of a freedom is automatically invalid, but it does mean the legislature must respect constitutional protections and justify the restrictions it imposes.

There may also be matters that the Constitution shields from ordinary legislative decisions, or content it requires to be preserved. The exact scope varies from country to country, but the general principle remains: a law is not valid simply because it is a law.

Formal and procedural limits: how a law must be passed

Formal limits regulate the lawmaking process. They may require debates, votes, quorums, publication, consultations, or other steps designed to ensure that the decision is adopted through the proper procedure.

These are not empty rituals. A legislative procedure can allow time to examine consequences, let minorities raise objections, and make visible who supports each decision. Skipping an essential requirement can affect the validity of the rule even when its content, considered in isolation, would be permissible.

Think of a proposal that requires a special majority but is approved as if an ordinary majority were enough. The problem would not necessarily be what it says, but the form used to turn it into law.

Competence limits: who may regulate what

Competence limits answer another question: did that body have authority to legislate on the matter? A Constitution may distribute powers among territorial levels, chambers, branches of government, or bodies with specific functions.

A parliament could therefore invade a competence reserved to another institution even if it followed every internal rule. Respecting competences prevents one body from accumulating powers that do not belong to it and supports checks and balances.

Key idea: a law can be invalid because of its content, because of the procedure used, or because the legislature acted outside its competence.

The legislature's margin of configuration

Limiting the legislature does not mean preventing it from making choices. Legislative activity requires setting priorities, comparing alternatives, and designing solutions for problems on which reasonable disagreement often exists. That space for choice is known as the legislative margin of configuration.

Within that margin, parliament can choose among different means that are compatible with the Constitution. It can weigh costs, negotiate, correct errors, and change policy when circumstances call for it. Judges and other oversight bodies should not automatically replace those decisions with their own preferences.

But margin does not mean absolute freedom. Discretion ends where constitutional prohibitions, other bodies' competences, mandatory procedures, and protected rights begin. The practical challenge is to preserve enough space for democratic decision-making without emptying the limits that make that democracy constitutional.

That tension explains why not every legislative disagreement should become a constitutional case, but also why no majority decision deserves unlimited deference. Popular representation justifies broad lawmaking power; it does not turn the legislature into a sovereign power above the Constitution.

Constitutional review makes those limits enforceable

A limit that no one can invoke risks becoming symbolic. Constitutional review allows laws to be compared with the Constitution and, depending on the system, invalidated, set aside, or sent back for correction.

This review is one of the constitutional guarantees against laws that conflict with higher norms. It can examine material, procedural, or competence-based questions. But it should not be confused with a general review of whether each public policy is desirable.

Constitutional review also carries a risk: that the reviewer improperly replaces decisions that belong to democratic debate. The answer is not to eliminate review, but to keep its function clear. It must protect constitutional supremacy without turning every political disagreement into a legal violation.

Warning: reviewing whether a law is constitutionally valid is not the same as deciding whether it is the best possible policy.

Legislating is not the same as amending the Constitution

The ordinary legislature acts within the Constitution. The power charged with amending it, by contrast, operates under different rules and procedures, usually more demanding ones. Confusing those roles leads people to think that a parliamentary majority can bypass any limit simply by passing a new law.

Nor is formal compliance with a procedure enough to guarantee that a rule is valid. A law passed through the correct procedure can still violate a material or competence-based limit. Form, content, and authority must be assessed together.

A practical test for understanding the limits

When you face a legislative decision, it helps to ask four questions:

• Did the body have competence to regulate that matter?
• Did it follow the constitutionally required procedure?
• Does the content respect rights and other higher norms?
• Does the objection point to a constitutional violation or only a political disagreement?

These questions do not resolve every case by themselves, but they help identify which type of limit is at stake and prevent distinct legal problems from being treated as if they were the same.

Limits on the legislature do not deny representative democracy. They give it a form compatible with liberty and predictability. A genuine government of laws requires that even those who make the laws remain subject to higher norms, defined competences, and effective checks. The majority may govern; what it may not do is turn its passing will into power without brakes.