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What is Promissory Estoppel?

What is Promissory Estoppel?

Promissory estoppel is meant to keep people from going back on their promises to the detriment of others. Learn more about promissory estoppel here.

22nd July 2019


What if someone makes you a promise, you act in reliance of that promise and the person does not come through? Bearing in mind that the promise was made without a formal consideration, it is normal for you to assume that nothing will happen. However, this is not always the case. The principle of promissory estoppel may allow you to recover on a promise without any formal consideration.

Promissory estoppel is a legal doctrine that stops a person from going back on a promise even in the absence of a legal agreement or a contract. It provides that a promise is enforceable by law when a person makes a promise to another person, and that other person relies on that promise to its detriment.

Promissory Estoppel Example

Let’s say X offers Y a job to start in three weeks. They agree that the contract would be available when party B moves from Sydney to Melbourne. Y then quits his existing job and moves to Melbourne to start his new job. X however, calls the whole thing off and hires someone else for the position.

In this instance, Y may sue X. Y could argue that the court should invoke the doctrine of promissory estoppel to stop X from walking away from the promise of a job without any recompense.

Elements of Promissory Estoppel

There are several legal requirements that you must fulfil in order to trigger a promissory estoppel.

Legal Relationship

Firstly, some form of legal relationship must exist or should be anticipated between the parties. Most commonly, this will be contractual relationship, meaning that the two parties have formed a legal agreement. The parties may also have a legal relationship if they are in the process of negotiating a contract.


Then, one of the two parties must make a promise to another or the representation of a fact. For it to hold up in court, the promisor should make a promise in a way that would cause the other party to assume that the promisor would follow through. Furthermore, the promise must be reasonable and believable.


Another crucial requirement for the principle of promissory estoppel to apply is that the party receiving the promise or representation must have acted in justifiable reliance on that statement.


Consequently, the party that relied upon the promise must have suffered some sort of detriment. Basically, the promisee has to be able to prove that they are worse off than they were prior to the making of the promise.


Lastly, an element of unconscionability has to be shown in order to enforce promissory estoppel. It must be proven that, if one party doesn’t fulfil their promise made to the other, it would create a circumstance of inequity between the parties. This element is really the backbone of estoppel.


The remedies available to someone who relied on a promise to their detriment are equitable. This simply means that the court has the discretion in deciding what to do in order to relieve the detriment. Mostly, the promisee is given an award that covers the cost of the promise that was made. Other times the court simply awards an amount that is deemed sufficient to cover the financial detriment suffered.


In an attempt to deliver justice, the court may enforce a promise without any consideration. To remedy a broken promise, you will need to formulate a clear case. If you are considering doing so, it is a good idea to seek legal advice from one of our contract lawyers.

Don’t know where to start? Contact us on 1800 529 728 to learn more about customising legal documents and obtaining a fixed-fee quote from Australia’s largest lawyer marketplace.

Anupa Dhital

Anupa is a Legal Intern at Lawpath, and is currently in her final year of studying Bachelor of Laws at Macquarie University.