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Difference between ratio decidendi and obiter dicta
Contracts and Agreements
Posted On : February 6, 2026

Difference between ratio decidendi and obiter dicta

Written By : Umashri Jana

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Table of Contents

Introduction:

The common law system is based on something called decisis. This means that courts have to follow what other courts have decided before. So basically, the common law system is about looking at what the law courts have done in the past.

Some court decisions are really important and some are not so important; they are opinions. We need to figure out which common law court decisions are really important and which ones are opinions.

To do this, we have to understand two concepts in the common law system: ratio decidendi and obiter dictum. The common law system has ratio decidendi and obiter dictum, and these are crucial in the law system.

They help us understand how the common law system works and how the common law system changes over time. The common law system and its ratio decidendi and obiter dictum are important to understand if we want to know how the common law system really works. By looking at what ratio decidendi and obiter dictum mean and how they're different, we can see why they matter so much in common law jurisprudence and the development of the law. The common law system relies on ratio decidendi and obiter dictum to make sense of court decisions.

Definition of Ratio Decidendi:

Ratio decidendi,a Latin term meaning “the reason for deciding.”

The ratio decidendi is very important because it explains why the judge chose to rule a way. Ratio decidendi is a part of the decision-making process, in a court of law.

The law is based on a principle that is used to make a decision in court. This principle is the part of the judgment that helped the court decide the case. The law is important to the decision. It becomes a rule that other courts have to follow in similar cases in the future. The law is what guides the decision of the court. The court uses the law to make a judgment. The law that is used to decide the case becomes a precedent for the law in cases.

Example:

For, example the Supreme Court decides:

A gift of a house or a piece of land is only real if you register it. You have to follow the rules of the Registration Act when you give someone a gift, like that. This means that the gift of property is valid only if it is registered under the Registration Act.

That legal rule becomes the ratio decidendi.

In future cases involving gift of immovable property, lower courts must follow this rule.

If we remove the rule, the decision would change; that’s how we identify the rule.


Key Features of Ratio Decidendi:

  1. It is the legal reason for the court’s decision.
  2. It is based on the material facts of the case.
  3. It is essential for deciding the case.
  4. It is binding on lower courts.
  5. It creates a rule of law for future similar cases.

Definition of Obiter Dicta:

Obiter dicta, a Latin phrase meaning "things said by the way" or "in passing.”

When a judge is making a decision, they sometimes say things that are not really important for the case. These things are called obiter dicta. Obiter dicta are like comments that the judge makes. They are not necessary for the judge to decide the case.

However, what the higher court says in their obiter dicta can be very helpful. This is especially true when the Supreme Court makes obiter dicta. The Supreme Court is an important court, so what they say can be very influential. Obiter dicta can be useful for judges who are trying to decide cases.

Example:

So a court is making a decision about a case where someone did not do what they promised in a contract. The court has to figure out what happened with the contract and who is at fault. This is a deal because the court's decision will affect the people involved in the contract. The contract is the issue here, and the court has to look really closely at the contract to make a fair decision about the breach of contract.

While giving the judgment, the judge also comments on how digital contracts should be regulated in the future.

That comment on digital contracts is obiter dicta because it was not necessary to decide the case.

Key features of Obiter Dicta:

  1. It consists of remarks or observations made by the judge.
  2. It is not essential to the final decisions of the case.
  3. It is not based on the material facts necessary for deciding the case.
  4. It is not binding on the lower courts.
  5. It may have persuasive value in future cases. 

A prominent example of influential obiter dicta is Central London Property Trust Ltd vs High Trees House Ltd (1947). Lord Denning's pronouncements on promissory estoppel were technically obiter, as the case was resolved on alternative grounds. Nevertheless, these statements were profoundly influential, effectively establishing a new doctrine in English contract law that has since been widely applied.

Differences Between Ratio Decidendi and Obiter Dicta:

The difference between ratio decidendi and obiter dicta is really important for law, and the way judges make decisions based on what happened before. This is what helps judges make decisions and what helps the law change over time. The law is shaped by ratio decidendi and obiter dicta, and understanding the difference between ratio decidendi and obiter dicta is crucial for judges and the law. Ratio decidendi and obiter dicta play a role in how judges make decisions and how the law develops.

The law works in a way. The binding force of a ratio decidendi is very important. It has authority and this means that lower courts have to follow it when they are dealing with similar cases. This helps to keep the law consistent and fair.

On the other hand, obiter dicta are different. They do not have to be followed by courts. Even if a higher court says something, it is not a rule that other courts have to obey. However, what the higher court says can still be very influential. Might be considered by other courts when they make their decisions. Ratio decidendi is still the thing that courts have to follow because it has the legal authority. Obiter dicta can be useful. They do not have the same binding force, as ratio decidendi.

So the ratio decidendi is really important to the judgment. It is the reasoning that the final decision is based on. If we take away or change the ratio decidendi, the outcome of the case would be different.

On the other hand, Obiter dicta are just extra comments or thoughts that are not necessary to decide the case. They are like remarks that the judge makes. If we remove the obiter dicta, the judgment would still be the same. The ratio decidendi is crucial, to the judgment; it is the legal reasoning that makes the decision.

Third, the relationship of ratio decidendi and obiter dicta to material facts is really different. Ratio decidendi is closely tied to the material facts of the case. It is about applying a legal rule to those material facts. You cannot understand ratio decidendi without knowing the facts of the case.

Obiter dicta is different. Obiter dicta often goes beyond the facts of the case. It talks about what might happen in situations, or it discusses general legal principles, or it considers policy issues that are not really necessary to resolve the dispute. Ratio decidendi and obiter dicta have relationships, to material facts.

Fourth, the role of ratio decidendi and obiter dicta in development is really different. Ratio decidendi helps to make the law more certain, stable and predictable. It does this by setting a precedent that must be followed. This gives us a framework for deciding future cases. On the other hand, obiter dicta are not binding, but they are still important. They let courts think about ideas and talk about things that might become law in the future. Obiter dicta also helps courts show how they might decide cases differently in the future without making a new rule right now. Ratio decidendi and obiter dicta are both important, in their own way and they both help the law to develop over time.

So the fifth thing is that figuring out what is important in a court decision takes a lot of thought. To find the point of the decision, you have to carefully read the whole decision and find the main idea that was decided based on the important facts. There are some tools that can help with this, like Wambaugh’s Inversion Test and Goodhart’s Material Facts Test.

It is a bit easier to find the comments that the judges make because they are usually just extra thoughts that are not really necessary to decide the case. However, in cases it can be hard to tell as what is the main point and what is just an extra comment and people may have different opinions about this.

Sixth, the way other courts treat these decisions shows how important they are. A binding decision has to be followed. It has to be looked at in a different way because of the facts, or it has to be officially overturned by a court that has the power to do so. On the hand, other comments made by judges, which are not part of the main decision can be used as a guide because they make sense, or they can be ignored without needing to be officially overturned, which gives other courts more freedom to interpret the law in their own way. The binding decision is still very important and has to be considered, but the other comments are not, as binding, and that is why they can be used or ignored, it depends on the situation. The courts have to deal with the binding decision in a way, but they have more options when it comes to the other comments made by judges.

The weight of advocacy and citation is really different from one to another. When a court makes a decision, some parts of that decision are very important. Lawyers can count on them. These parts are like a guide that lawyers can follow. On the other hand there are other parts of the decision that are not as important and lawyers can only use them to make a good argument. The other side can say that these parts do not apply, and it is up to the court to decide whether to use them or not. The court has the power to accept or reject these parts of the decision. Legal advocacy and citation are used in ways, and it is important to know the difference between them.

Conclusion:

So, the way things work with the precedent doctrine in law systems is that it is really important to know the difference between ratio decidendi and obiter dictum. The ratio decidendi is what makes the law clear and consistent. It is what people can expect from court rulings. This is the part of the law that is actually binding. It comes from the important facts of a case. On the other hand, obiter dicta are not binding, but they let judges say what they really think and look into new ideas about the law. This helps the law to grow and change. It can be very persuasive. The precedent doctrine and the way it uses ratio decidendi and obiter dictum is what makes the law work in legal systems. The ratio decidendi and obiter dictum are. Important parts of the precedent doctrine. Together, they preserve the legal system's equilibrium between stability and adaptability, allowing the law to continue being both authoritative and flexible.

About the Author
Umashri Jana

Adv. Umashri Jana

Advocate Umashri Jana is an emerging legal professional with a Bachelor of Laws (B.A. LL.B. Hons) from Adamas University and 6 months of practical experience. She is steadily building her presence in the legal field through her dedication, discipline, and growing expertise in civil, criminal, family, and consumer law. She has appeared before various courts in West Bengal, including District & Sessions Courts and Sub-Divisional Courts, and is known for her attention to detail, strong research skills, and client-focused approach. Despite being early in her career, Advocate Jana demonstrates clarity, diligence, and professionalism in handling diverse legal matters, consistently striving to provide effective and empathetic legal support to her clients.

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