What Happens When Constitutions Have Built-In Mandatory Revision Schedules

Every constitution is, in part, a document of entrenchment. Its primary political function is to remove certain questions from ordinary political resolution — to say that these rights, these structures, these limits on government are not subject to majority vote. This is the feature of constitutionalism, not a bug. The whole point is to protect certain things from political revision.

But entrenchment as a mechanism is neutral with respect to what gets entrenched. A constitution can entrench universal suffrage or the property rights of slave owners. It can protect freedom of speech or the privileges of a dominant ethnic group. The moral evaluation of entrenchment depends entirely on what is being entrenched and whether it continues to serve the population governed.

When the constitution was written by representatives of a limited slice of the population — property-owning men, typically white, usually drawn from elite social networks — and then entrenched against revision, what was entrenched was the political vision of that limited group. The question for any society living under such a document centuries later is whether its entrenched provisions continue to reflect the political values of the current population, or whether they represent the values of people who have been dead for two centuries and whose social world has no continuity with the present.

This is not an abstract question. In the United States, constitutional provisions drafted in 1787 — the Electoral College, the equal representation of states in the Senate, the separation of powers structure — were designed for a country of 4 million people organized around thirteen coastal states with extremely limited communication and transportation technology. They now govern a country of 340 million people spread across fifty states with instantaneous global communication, a vast administrative apparatus, and a political economy their designers could not have conceptualized. The provisions do not merely reflect eighteenth-century values; they reflect eighteenth-century assumptions about governance logistics that no longer apply.

The mandatory revision schedule is a mechanism for forcing this confrontation. If a constitutional review is required every twenty or thirty years — regardless of political will, regardless of whether any particular actor wants revision — then the question of whether the constitution continues to fit is posed on schedule rather than deferred indefinitely.

The variation across constitutional systems in amendment frequency and longevity provides useful empirical data on the effects of different revision architectures.

The United States Constitution is the world's oldest written national constitution still in effect. At 235 years old and with only twenty-seven amendments (ten of which were the original Bill of Rights, ratified as a package two years after the main document), it is also one of the most difficult to amend. The average amendment frequency is approximately once every nine years — but the actual distribution is extremely uneven: seventeen amendments between 1865 and 1971, then none substantive for over fifty years.

Germany's Basic Law, by contrast, has been amended over sixty times since its adoption in 1949 — an average of approximately once per year. The German system requires two-thirds majorities of both the Bundestag and Bundesrat, a threshold that prevents simple majority rule while permitting broad coalition amendment. The high amendment frequency reflects both the accessibility of the process and a political culture that treats constitutional amendment as a normal instrument of governance rather than a revolutionary act.

India's Constitution, adopted in 1950, has been amended over one hundred times. The amendment process requires only a special majority of Parliament (two-thirds of members voting, constituting a majority of the total membership) for most provisions, and additionally state ratification for certain federal provisions. The high amendment frequency has produced a constitution that is deeply responsive to changing social and political conditions — but also one that has been used by political majorities to entrench provisions that critics argue undermine constitutional rights rather than protecting them. The Indian case illustrates the risks of excessive accessibility: a process too easy becomes an instrument of parliamentary majority rule rather than constitutional protection.

The optimum lies between the American and Indian extremes, and different constitutional systems have found different points on that spectrum. Switzerland's constitutional revision process — which routes major revisions through mandatory national referenda — combines accessibility with direct democratic legitimacy. Finland's two-parliament process ensures that amendments survive at least one election cycle, preventing hasty revision while not making amendment prohibitively difficult.

The existence of a mandatory revision schedule does not only affect constitutional texts — it affects political culture in ways that go beyond the specific changes made or not made at each review cycle.

The most important cultural effect is the normalization of constitutional self-reflection. In systems where constitutional amendment is extraordinary — reserved for genuine crises or extraordinary political moments — the constitution develops a sacred quality that makes ordinary political discussion of its provisions feel transgressive. In the United States, describing the Second Amendment as a historical artifact of eighteenth-century militia regulation rather than a timeless individual right is politically charged in a way that has no parallel in countries where constitutional provisions are regularly revisited.

When constitutional review is scheduled and normal, the provisions of the constitution can be discussed as the political choices they are — choices that made sense in their historical context, that may or may not continue to make sense, and that are subject to revision by the democratic process. This is not constitutional instability. It is constitutional maturity — the recognition that a governing document is a human artifact, not a sacred text, and that its legitimacy depends on its continued capacity to reflect the values and serve the needs of the people governed by it.

The second cultural effect is the normalization of constitutional literacy. When revision is scheduled, political actors have an incentive to understand what the constitution actually says — not just its most contested provisions but its structure, its values, and its gaps. Constitutional review processes, when they are genuinely participatory, can become exercises in civic education at scale. Iceland's 2011 constitutional drafting process — which used crowdsourcing and public participation to develop a new constitutional text — was as significant for the political engagement it produced as for the text it generated.

The third cultural effect is the reduction of constitutional nostalgia. In systems with very difficult amendment processes, the founding document acquires an emotional weight — reverence for founders, attachment to original intent — that makes rational evaluation of its provisions politically costly. Mandatory revision schedules implicitly signal that the constitution belongs to the living, not the dead, and that its authority derives from its continued democratic legitimacy rather than from the wisdom of its authors. This is a healthier relationship between a political community and its foundational law.

Portugal's 1976 constitution is one of the few in the world with an explicit mandatory revision schedule. Article 284 provides that the Assembly of the Republic may revise the constitution five years after the previous ordinary revision. The schedule is not absolutely binding — it can be altered by a two-thirds majority — but the structural expectation of periodic revision is built into the constitutional text.

In practice, Portugal has revised its constitution substantially since 1976. The original document was drafted in the aftermath of the Carnation Revolution and contained significant socialist provisions, including references to building a classless society and provisions for the nationalization of major industries. Successive revisions have moved the constitution toward liberal democratic norms, removed provisions that had become obsolete, and adapted constitutional guarantees to European Union membership. The 1982 revision eliminated the Council of the Revolution (a military oversight body) and substantially reduced the role of the military in governance. The 1989 revision permitted privatization of nationalized industries. The 1997 revision expanded political rights and strengthened social rights.

The Portuguese case demonstrates that mandatory revision schedules can serve as peaceful mechanisms for constitutional adaptation to changing political and economic realities. The transitions that would have required constitutional crises or extra-constitutional action in a more rigid system were managed through formal revision processes in Portugal.

Finland's constitutional revision process — which requires amendment to pass one parliament and then be confirmed by the parliament elected at the following election — is not strictly mandatory on a schedule but creates a structural commitment to constitutional continuity across electoral cycles. The Finnish Constitution has been significantly revised several times since 1919, most notably in the comprehensive 2000 reform that modernized constitutional language, strengthened fundamental rights guarantees, and clarified the relationship between the President and Parliament.

Denmark's constitutional revision process requires a referendum — a majority of the population, constituting at least 40 percent of the total electorate, must approve an amendment passed by two successive parliaments. This is a demanding threshold that has in practice made amendment rare (the current 1953 constitution has not been amended). But the requirement for popular referendum builds a different form of democratic legitimacy into the revision process, one that connects constitutional change directly to popular will rather than routing it entirely through representative institutions.

Every constitution with a mandatory revision schedule must also address the question of what cannot be revised — the eternity clauses, in German constitutional law terminology, that place certain provisions beyond any amendment process.

Germany's Basic Law contains Article 79(3), which prohibits amendments that affect the dignity of human beings, the federal structure, or the basic democratic principles of the state. These are the provisions so fundamental to the post-Nazi constitutional order that the framers decided no subsequent political majority should be able to remove them. They represent the constitutional community's judgment about which values are non-negotiable.

The challenge is that even eternity clauses reflect the value judgments of a particular historical moment. The German eternity clauses reflect the specific lessons of National Socialism and are calibrated to prevent its recurrence. A different historical experience might have produced different eternity clauses. When mandatory revision schedules are implemented, the question of what falls within the scope of revision and what is protected by eternity clauses is one of the most important design decisions — and one that must itself be periodically revisited, because the threats to democratic values change over time.

South Africa's 1996 Constitution, widely regarded as one of the most rights-protective in the world, contains provisions that can only be amended by special majorities and that protect a comprehensive set of socio-economic rights — rights to housing, healthcare, food, water, social security, and education — alongside civil and political rights. The inclusion of socio-economic rights was a deliberate choice by the drafting process, reflecting the specific historical context of apartheid and the necessity of constitutional commitment to material equality as well as political liberty. Whether those rights can be made justiciable in ways that do not overload the courts and undermine democratic accountability is an ongoing question — one that revision processes could, in principle, address.

The strongest argument for mandatory constitutional revision schedules is not ideological — it is pragmatic. Constitutions that cannot be revised tend to be worked around. The formal document persists while the operative constitutional order evolves around it through judicial interpretation, executive assertion, legislative workaround, and gradual normative change.

The United States provides an extensive case study in this dynamic. The formal constitution has barely changed in fifty years, but the operative constitutional order has changed dramatically — through Supreme Court decisions that expanded and then contracted rights, through executive orders that assumed legislative functions, through congressional delegation that transferred lawmaking authority to administrative agencies, through the development of the filibuster from a procedural rarity to a de facto supermajority requirement for ordinary legislation. These changes occurred largely outside the formal amendment process, driven by political actors who found the formal revision mechanism too demanding.

The result is a constitutional order that is neither what the framers intended nor what a contemporary democratic majority would choose — it is the accumulated residue of workarounds, interpretations, and political expedients, many of which have been naturalized through repetition into apparent constitutional facts.

A mandatory revision schedule does not guarantee that the formal constitution will track the actual constitutional order more closely. But it provides regular occasions for explicit democratic deliberation about whether the formal text should be revised to reflect changed realities — and for holding political actors accountable to the gap between the two. It substitutes explicit democratic choice for accumulated extra-constitutional improvisation.

Constitutions are the most powerful long-form documents that human civilization has produced. They encode the fundamental terms of political life — who has rights, who has power, what government can and cannot do, how conflicts are resolved. When they are well-calibrated to the values and conditions of the people they govern, they are stabilizing. When they are badly calibrated — when they are relics of a political moment that has passed, enforcing arrangements that would not survive democratic choice if they could be directly voted on — they are destabilizing, in ways that are slow and invisible until they are sudden and obvious.

The mandatory revision schedule is an expression of civilizational humility: the acknowledgment that those who govern today cannot fully anticipate the conditions under which those who come after them will need to be governed, and that the wisest course is not to bind the future rigidly but to create frameworks capable of intelligent adaptation.

Jefferson's nineteenth-year proposal was too aggressive — it would have created constitutional instability without the benefit of accumulated experience. But his underlying insight was correct: a governing document derives its legitimacy from the consent of the living, not the wisdom of the dead. Building mechanisms for periodic renewal into the constitutional architecture is not a concession to political convenience. It is a commitment to the deepest principle of democratic governance — that political authority is accountable to the people it governs, now, not merely to the people who founded it then.