Every law passed in India, every order a government officer signs, every case a court decides, draws its authority from one document — and can be struck down by it. That is what "supreme law" actually means, and it is why the Constitution is worth understanding structurally rather than as a list of famous articles.
The Constitution of India was adopted on 26 November 1949 and came into force on 26 January 1950; it can be amended under Article 368, but not in ways that destroy its basic structure.
The bottom line
What it is: the supreme law, with roughly 448 articles, 25 Parts and 12 Schedules, amended 106 times as of 2026. The longest written constitution of any sovereign nation.
What it establishes: a sovereign, socialist, secular, democratic republic, parliamentary in form and federal in structure, with a strong Centre.
Its core pillars: Fundamental Rights in Part III, Directive Principles in Part IV, Fundamental Duties in Part IVA.
The limit on change: Article 368 allows amendment; the basic structure doctrine says an amendment cannot gut the Constitution's core identity.
How it was made
The Constitution was drafted in the aftermath of independence and adopted in 1949. A Constituent Assembly first met in December 1946 and worked for nearly three years. A Drafting Committee chaired by Dr. B.R. Ambedkar prepared the text. The Assembly adopted the Constitution on 26 November 1949, now Constitution Day, and it came into force on 26 January 1950 — a date chosen to honour the 1930 "Purna Swaraj" declaration, and now Republic Day.
The framers borrowed openly. The parliamentary system and rule of law came from Britain, fundamental rights and judicial review from the United States, directive principles from Ireland, and the federal scheme and emergency provisions partly from the Government of India Act, 1935. What came out is not a copy of any one model but a synthesis built for a very large and very diverse country.
The structure
The Constitution is famously long. As of 2026 it comprises:
- a Preamble, the philosophical introduction;
- about 448 Articles, still numbered 1 to 395, with many inserted over time — 21A, 51A and 300A among them;
- 25 Parts, each a self-contained subject, grown from the original 22 as Parts on Fundamental Duties, Municipalities, Co-operative Societies and Tribunals were added and one was repealed; and
- 12 Schedules, the operational lists and tables, grown from the original 8.
The detail is deliberate. Matters left to ordinary statute in other democracies are written into the Constitution here, which is one reason it gets amended so often.
The Preamble
The Preamble is the whole document compressed into a paragraph. It declares India a Sovereign, Socialist, Secular, Democratic Republic — "Socialist" and "Secular" were added by the 42nd Amendment in 1976 — and resolves to secure for all citizens justice, social, economic and political; liberty of thought, expression, belief, faith and worship; equality of status and opportunity; and fraternity, assuring the dignity of the individual and the unity and integrity of the nation.
The Supreme Court has held that the Preamble is part of the Constitution and reflects its basic structure, so it guides how the rest of the text is read.
What defines the system
- Supremacy of the Constitution. It is the highest law and everything else must conform.
- Rigid and flexible at once. Some provisions amend easily; others need special majorities and state ratification.
- Parliamentary government at the Centre and in the states.
- Federal structure with a unitary bias. Power is shared with the states, but the Centre is strong, especially in emergencies.
- Rights, Principles and Duties working together rather than in isolation.
- An independent judiciary with the power of judicial review.
- Universal adult franchise. Every citizen aged 18 and over can vote, the age having been lowered from 21 by the 61st Amendment.
- Single citizenship for the whole country.
Fundamental Rights, Part III
Articles 12–35 guarantee enforceable rights protecting individuals against the State, and in some cases against private parties. They group into six.
- Right to Equality, Articles 14–18: equality before law, prohibition of discrimination, equality of opportunity, abolition of untouchability and titles.
- Right to Freedom, Articles 19–22: freedoms of speech, assembly, association, movement, residence and profession; protections in criminal matters; and the right to life and personal liberty under Article 21, which courts have expanded to cover dignity, privacy, a clean environment and more.
- Right against Exploitation, Articles 23–24: bans on forced labour and child labour.
- Right to Freedom of Religion, Articles 25–28.
- Cultural and Educational Rights, Articles 29–30, protecting minorities.
- Right to Constitutional Remedies, Article 32: the right to move the Supreme Court directly to enforce these rights, which Ambedkar called the "heart and soul" of the Constitution. Courts enforce them through the writs — habeas corpus, mandamus, prohibition, certiorari and quo warranto.
One right moved out. The right to property was removed as a fundamental right by the 44th Amendment and is now a constitutional and legal right under Article 300A.
Directive Principles, Part IV
Articles 36–51 set out guidelines for the State in making laws and policy, aimed at social and economic justice: adequate livelihood, equal pay, free legal aid, village panchayats, free and compulsory education, protection of the environment.
They are not enforceable in court, which is the difference that matters. But they are declared fundamental to governance, and courts read them alongside Fundamental Rights so the two are interpreted harmoniously rather than in competition.
Fundamental Duties, Part IVA
Added by the 42nd Amendment in 1976, Article 51A lists the duties of every citizen: respecting the Constitution, the national flag and the anthem; cherishing the ideals of the freedom struggle; protecting sovereignty and unity; safeguarding the environment; and, added later, providing education to one's child.
They are not directly enforceable either. What they express is the civic side of the bargain that rights sit on.
Federalism and the division of powers
India is a federal union with powers divided between the Centre and the states, and a tilt towards the Centre. The Seventh Schedule splits law-making subjects into three lists.
- Union List — only Parliament may legislate: defence, foreign affairs, currency.
- State List — the state legislatures: police, public health, agriculture.
- Concurrent List — both may legislate: criminal law, contracts, education. Where their laws conflict, the central law generally prevails.
The Centre's dominance shows in its powers over residuary subjects, the all-India services and emergencies, which is why India is usually described as a federation with a strong centralising bias rather than a federation simply.
The three organs
- The Legislature — Parliament at the Centre, being the Lok Sabha and Rajya Sabha with the President, and the state legislatures.
- The Executive — the President as constitutional head with the Council of Ministers led by the Prime Minister, and the Governor and Chief Minister in the states.
- The Judiciary — the Supreme Court, the High Courts and the subordinate courts, interpreting the law, protecting rights and exercising judicial review over laws and executive action.
A judiciary free to strike down laws that violate the Constitution is what holds the rest of the design in place.
How the Constitution is amended
It can be changed, but not casually. Article 368 provides three routes.
- Simple majority for some changes, such as admitting new states.
- Special majority for most amendments: a majority of the total membership of each House, and two-thirds of members present and voting. The total-membership requirement means an absent member effectively counts against the bill.
- Special majority plus state ratification for amendments touching the federal structure — the distribution of powers, the election of the President, representation of states, or Article 368 itself — which additionally need at least half the state legislatures.
The graded process protects the federal balance while letting the document evolve. In practice it is amended roughly twice a year.
The basic structure doctrine
Parliament's power to amend is vast and not unlimited. In Kesavananda Bharati v. State of Kerala (1973) the Supreme Court held that Parliament cannot amend the Constitution so as to destroy its basic structure.
The Court has never given an exhaustive list. What is understood to be inside it includes the supremacy of the Constitution, the rule of law, separation of powers, judicial review, federalism, secularism, democracy and the protection of fundamental rights.
This is the ultimate guardrail: a properly passed amendment can still be struck down if it guts the Constitution's core identity. It is also one of Indian constitutional law's most significant contributions anywhere.
The amendments that mattered
- 1st Amendment (1951): added the Ninth Schedule to protect land-reform laws.
- 42nd Amendment (1976): the sweeping "mini-Constitution", adding "Socialist", "Secular" and "Integrity" to the Preamble and introducing Fundamental Duties.
- 44th Amendment (1978): reversed several Emergency-era changes and made the right to property a legal right.
- 73rd and 74th Amendments (1992): gave constitutional status to Panchayats and Municipalities.
- 101st Amendment (2016): introduced the Goods and Services Tax.
- 106th Amendment (2023): the Nari Shakti Vandan Adhiniyam, reserving one-third of seats for women in the Lok Sabha and state assemblies.
The 106th is the subject of a live and politically contested debate, worth setting out neutrally. The amendment was brought into force by gazette notification in April 2026, but the reservation itself remains inoperative, because the Act ties its commencement to a fresh census and a subsequent delimitation, meaning the redrawing of constituencies.
In April 2026 the government introduced bills, among them a proposed 131st Amendment to enable delimitation on existing census data and to raise the Lok Sabha's maximum strength. The 131st Amendment Bill was defeated in the Lok Sabha, falling short of the required two-thirds majority. Delimitation is sensitive partly because redrawing seats by population could shift representation between states. So as of 2026 the women's reservation is enacted but dormant law, its activation still pending.
Emergency provisions
There are three kinds. A National Emergency under Article 352, on grounds of war, external aggression or armed rebellion. President's Rule in a state under Article 356, on failure of constitutional machinery. And a Financial Emergency under Article 360.
During an emergency the federal balance shifts sharply towards the Centre and some rights can be affected. That is why these powers, and the safeguards built around them after the 1975–77 Emergency by the 44th Amendment, remain among the most closely scrutinised parts of the document.
The judgments that shaped it
Kesavananda Bharati (1973) established the basic structure doctrine. Maneka Gandhi v. Union of India (1978) expanded the meaning of personal liberty under Article 21. K.S. Puttaswamy (2017) recognised the right to privacy as a fundamental right. And a long line of cases has continued to broaden Article 21 to take in dignity, livelihood and a clean environment.
Read together they describe a living Constitution — interpreted to meet changing times while its core values hold still.
Frequently asked questions
When was the Constitution of India adopted and enforced? Adopted on 26 November 1949, and in force from 26 January 1950.
How many articles, parts, schedules and amendments does it have? About 448 articles, 25 Parts and 12 Schedules, with 106 amendments as of 2026.
What is the basic structure doctrine? A principle from Kesavananda Bharati (1973) that Parliament can amend the Constitution but cannot destroy its core features, such as democracy, secularism, federalism, judicial review and fundamental rights.
What is the difference between Fundamental Rights and Directive Principles? Fundamental Rights in Part III are enforceable in court. Directive Principles in Part IV are non-enforceable guidelines for the State, though courts read the two together.
How is the Constitution amended? Under Article 368: simple majority for some matters, a special majority for most, and a special majority plus ratification by half the states for changes affecting the federal structure.
Is the women's reservation in force? The 106th Amendment is enacted and notified, but the reservation is dormant, because it commences only after a fresh census and delimitation.