Fundamentals of Business Laws and Business Communication · Legislative Process in India

Indian Constitution and Sources of Law in India

Updated 10 October 2026 · Fact-checked

The Indian Constitution is the supreme law of India. Every other law must follow it, or courts can strike it down. Indian law comes from the Constitution, statutes (legislation), delegated legislation, judicial precedents, customs and usages, and personal laws. To solve questions, identify the source and match it to its definition.

Understand Indian Constitution and Sources of Law

Law is a set of rules made or recognised by the State and enforced by courts. To understand Indian law, you need to know two things: which law is the highest, and where laws come from.

The Constitution of India is the highest law. It came into force on 26 January 1950. It sets up the organs of the State (Legislature, Executive and Judiciary), divides powers between the Union and the States, and guarantees Fundamental Rights to citizens. Any law that goes against the Constitution can be declared invalid by the Supreme Court or a High Court. This is why we call it the supreme law of the land.

Key features you should remember:
- It is the longest written Constitution of any sovereign country.
- The Preamble describes India as a sovereign, socialist, secular, democratic republic.
- It gives a parliamentary form of government at the Union and State levels.
- It is federal in structure but has a strong tilt towards the Centre, so it is often called quasi-federal.
- It contains Fundamental Rights, Directive Principles of State Policy and Fundamental Duties.
- It provides an independent judiciary with the power of judicial review.
- It is partly rigid and partly flexible, because different parts need different methods of amendment.

Now the sources of law. A source is where a rule gets its legal force. The main sources are:
- Constitution: the basic law that all others depend on.
- Statutes or legislation: Acts passed by Parliament or State Legislatures. This is the most important source today.
- Delegated legislation: rules, regulations and bye-laws made by the Executive or other bodies under power given by an Act.
- Judicial precedents or case law: principles laid down in earlier court decisions that guide later cases.
- Customs and usages: long-followed practices that courts accept as binding. A custom cannot override a statute. If an Act clearly says otherwise, the Act prevails.
- Personal laws and other sources: such as religious texts for family matters, and international treaties.

Statute law is written and enacted by a legislature. Case law is built up by judges through decisions. A statute starts as a Bill, while case law grows from the facts and reasoning of individual cases.

Key formulas to remember

Supremacy of the Constitution: Constitution > Statutes > Delegated legislation; A statute that conflicts with the Constitution is void to that extent. Delegated legislation that conflicts with its parent Act can be struck down. A custom also cannot override a statute.
Statute law vs case law: Statute law = written law enacted by a legislature; Case law = law made through judicial decisions; Use this one-line contrast to answer difference-type questions.
Main sources of Indian law: Constitution + Statutes + Delegated legislation + Precedents + Customs + Personal laws; Learn this list in order. Questions often ask which option is NOT a source.
Binding force of precedents: Under Article 141, law declared by the Supreme Court binds all courts in India; the Supreme Court itself can overrule its earlier decisions; A High Court decision binds courts below it within its own state. It is only persuasive in other states.
Valid custom: Ancient (immemorial) + Certain + Reasonable + Continuous + Peaceful and followed as of right + Obligatory (binding in nature) + Not against law or public policy; A custom must meet these conditions before a court will enforce it. Even a valid custom gives way to a statute that overrides it.

How to solve Indian Constitution and Sources of Law questions

Most questions on this topic ask you to identify a feature, define a source, or tell two sources apart. Use this method.

1Read the question and mark the key word: Constitution, statute, delegated legislation, precedent, custom or personal law.
2Decide whether it asks for a feature, a definition, a difference, or an odd one out.
3Recall the one-line definition of each source and match the clue in the question.
4For Constitution questions, link the clue to a known feature: written, federal, parliamentary, Fundamental Rights, judicial review.
5Eliminate options that mix up terms, such as calling a court decision a statute or a bye-law a Constitution.
6Check for words like 'only', 'always' and 'supreme'. Pick the option that fits the exact rule.
7Choose the remaining option and move on.

Quickest way: Clue-word matching

When to use it: Use it for any MCQ where the options are names of sources or features. It takes under 40 seconds.

Written by Parliament or a State Legislature: statute.
Made by a minister, department or local body under an Act: delegated legislation.
Past court decision followed in later cases: precedent or case law.
Long-practised local or trade practice that is ancient, certain, reasonable and followed as of right: custom or usage.
Highest law, can void other laws: Constitution.
Strike out options that do not match the clue and pick the best fit.

Common mistakes in Indian Constitution and Sources of Law

Treating case law and statute law as the same thing.
Both are enforced by courts, so they feel alike.
Fix: Remember who makes them: legislature makes statutes, judges build case law through decisions.
Saying the Constitution is purely rigid or purely flexible.
Students memorise one word from a textbook line.
Fix: Say it is partly rigid and partly flexible, because some provisions can be amended by simple majority and others need special majority or State ratification.
Calling India a purely federal country.
Students see the Union-State division and stop there.
Fix: Write federal with a unitary bias or quasi-federal, because the Centre has stronger powers.
Leaving out delegated legislation when listing sources.
Students remember only statutes, customs and precedents.
Fix: Include delegated legislation. It is made under an Act and is very common in practice.
Thinking any custom is binding.
The word custom sounds like it automatically has force.
Fix: Check the conditions: the custom must be ancient, certain, reasonable, continuous, peaceful, followed as of right, obligatory and not against law or public policy. Remember that a statute can override a custom.

Worked examples

Example 1

Which of the following is the supreme law of India? (a) Indian Contract Act (b) Constitution of India (c) Rules framed by a Ministry (d) Decision of a High Court

Show the solution

The question asks for the highest law.
An Act is a statute and must follow the Constitution.
Ministry rules are delegated legislation, below an Act.
A High Court decision is a precedent and also cannot override the Constitution.
Only the Constitution can void other laws.

Answer: (b) Constitution of India

Example 2

Which of the following is a difference between statute law and case law? (a) Statute law is made by judges, case law by Parliament (b) Statute law is enacted by a legislature, case law develops from judicial decisions (c) Both are made only by the Executive (d) Case law is always written in the Constitution

Show the solution

Recall: statute law is written law passed by Parliament or a State Legislature.
Case law comes from principles stated by judges while deciding cases.
Option (a) reverses the makers, so it is wrong.
Option (c) is wrong because the Executive makes delegated legislation, not these two.
Option (d) is wrong because case law is not part of the Constitution's text.
Option (b) states the correct contrast.

Answer: (b) Statute law is enacted by a legislature, case law develops from judicial decisions

Exam tips

Learn the list of sources in order and be ready for odd-one-out questions.
Read options for swapped terms, such as statute and precedent exchanged between definitions.
For Constitution features, watch for extreme words like 'purely' or 'only'. Quasi-federal and partly rigid are the safe phrases.
Know that under Article 141 the law declared by the Supreme Court binds all courts in India, though the Supreme Court can overrule its own earlier decisions. A High Court binds only courts below it in its state.
For custom questions, check every condition, including that it is obligatory and followed as of right, and remember a statute overrides custom.
There is no negative marking, so attempt every question and use elimination when unsure.

Practice questions from Legislative Process in India

Indian Constitution and Sources of Law in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Indian Constitution and Sources of Law: frequently asked questions

What are the main sources of law in India?

The main sources are the Constitution, statutes, delegated legislation, judicial precedents, customs and usages, and personal laws. Statutes passed by Parliament and State Legislatures are the most important source today.

What is the difference between statute law and case law?

Statute law is written law enacted by a legislature in the form of an Act. Case law is developed by judges through their decisions and is followed as precedent in later cases.

Why is the Constitution called the supreme law?

All other laws must follow it. If a statute or rule conflicts with the Constitution, courts can declare it void to the extent of the conflict.

Is Indian Constitution federal or unitary?

It is federal in structure, with powers divided between the Union and the States. It also has strong unitary features favouring the Centre, so it is often described as quasi-federal.