Is promissory estoppel a defence?

Asked by: Eleanora Shields  |  Last update: January 29, 2026
Score: 4.8/5 (24 votes)

Yes, promissory estoppel is primarily used as a defense (a "shield") to prevent someone from enforcing their strict legal rights when they made a promise that another party reasonably relied on to their detriment, though in some cases, particularly proprietary estoppel, it can act as a basis for a claim (a "sword"). It stops a promisor from going back on their word when it would be unfair, acting as an equitable bar to an inequitable claim, especially in contract disputes where a formal contract might not exist.

Is promissory estoppel a defense?

The legal elements of promissory estoppel are as follows: (1) a promise; (2) foreseeability of reliance thereon by the promisor; and (3) substantial reliance by the promisee to its detriment. It is important to note that promissory estoppel is defensive in nature.

Can promissory estoppel only be used as a Defence?

Furthermore, it cannot serve as a cause of action but merely as a defence (a shield, not a sword). The conduct and context of the involved parties are crucial in determining its applicability.In essence, promissory estoppel is vital for maintaining fairness and justice in UK contract law.

Is estoppel a claim or defence?

Although estoppel is an equitable remedy, generally thought to be used as a shield rather than a sword – essentially a defence to a claim rather than a claim in itself – it is increasingly common that estoppel will form a claim in its own right.

Can estoppel be used as a defense?

Estoppel in pais (also called equitable estoppel) is a defense doctrine that prevents a party from using a right against another party when the right arises out of misleading actions from the person claiming the right.

What is Promissory Estoppel? [No. 86]

39 related questions found

Is promissory estoppel a sword or shield?

Combe v Combe [1951] 2 KB 215 (CA)

Combe v Combe in the Court of Appeal, again with Lord Denning, clarified a crucial limitation: promissory estoppel is only a shield, not a sword.

Is estoppel an affirmative defense?

Estoppel is an equitable doctrine, a bar that prevents one from asserting a claim or right that contradicts what one has said or done before, or what has been legally established as true. Estoppel may be used as a bar to the re-litigation of issues or as an affirmative defense.

What are the four requirements for promissory estoppel?

Requirements of a Promissory Estoppel

  • Promisor made a significant promise to cause the promisee to act on it. ...
  • Promisee relied on the promise. ...
  • Promisee suffered significant damage by relying on the promise. ...
  • Fulfillment of the promise is the only way the promisee can be compensated.

Is an estoppel legally binding?

An estoppel certificate is a legally binding document whereby a tenant represents or promises certain things regarding its lease or rental agreement to be true.

What is the difference between estoppel and promissory estoppel?

Secondly, proprietary estoppel requires the promisee to have acted to his detriment, while promissory estoppel may operate even though the promisee merely performs a pre-existing duty and so suffers no detriment in the sense of doing something that he was not previously bound to do.

When can promissory estoppel not be used?

“No contractual or promissory estoppel "liability may be assessed against [a state agency]" if the contract or promises were not "statutorily or constitutionally authorized” US Ecology, Inc. v. State of California(2005) 129 Cal. App.

What is the burden of proof for promissory estoppel?

The burden of proof is on the plaintiff to satisfy each element of a promissory estoppel claim, typically by clear and convincing evidence or by a preponderance of the evidence.

What are the 5 elements of promissory estoppel?

In analyzing the application of section 90, the Washington courts have established five requirements for recovery in promissory estoppel: “(1) a promise which (2) the promisor should reasonably expect to cause the promisee to change position and (3) which does cause the promisee to change position (4) justifiably ...

What are affirmative defenses to promissory estoppel?

An affirmative defense is a defense that brings up new facts or issues not in the Complaint that, if true, would be a legal reason why the plaintiff should not win, or should win less than they're asking for.

Can promissory estoppel prevent a party from using lack of consideration as a defense?

Promissory estoppel allows promises to be enforced by law even without formal consideration if significant reliance and detriment occur. This doctrine prevents a promisor from denying the enforceability of their promise if the promisee has suffered financial harm due to reliance.

What damages are awarded for promissory estoppel?

In a promissory estoppel case, the court in its discretion can award either detrimental reliance damages or expectation damages (including specific performance), whichever it determines better avoids injustice.

Is estoppel a defence?

Therefore promissory estoppel is an "equity" falling within Sections 95 and 98 of the Common Law Procedure Act, 1899-1957, and can be pleaded as a defence at common law in this State.

Is estoppel an equitable defense?

That is, a person can be estopped from asserting a right under a contract if they acted in ways inconsistent with that right, through acquiescence or inaction. This is most often referred to as equitable estoppel.

What is the Supreme court Judgement on estoppel?

In Gopal Prasad Sinha v. State of Bihar18, the Supreme Court of India clarified the foundational principle of issue estoppel. The Court held that for issue estoppel to apply, the same issue of fact and law must have been conclusively determined in a prior litigation.

What must you prove in a successful promissory estoppel case?

The elements of promissory estoppel include a clear promise, reasonable reliance, and resulting injustice if the promise is not enforced. Legal requirements for promissory estoppel vary by jurisdiction but generally involve the promisor making an assurance that leads to substantial reliance.

Does promissory estoppel undermine consideration?

Professor Halson[13] suggests that promissory estoppel cannot give rise to a cause of action in his 'estoppel spectrum' because to do so would undermine the doctrine of consideration.

What three conditions must be met before the principle of promissory estoppel can be applied?

The doctrine of promissory estoppel is invoked in the interests of justice when three conditions are met: (1) the promise is one that the promisor should reasonably expect to induce the promisee to take action or forbear from taking action of a definite and substantial character; (2) the action or forbearance is taken; ...

What is the burden of proof for estoppel?

Estoppel is considered an affirmative defense and the burden is on the defendant to prove the requirements of the defense are met. Court Opinions; POL. Affirmative defenses such as estoppel must be pled by the defendant and should be raised at the first opportunity to avoid the risk of waiver.

Is estoppel a defense to breach of contract?

Estoppel — This equitable defense is available when one party delays action in good-faith reliance on another party's statements or conduct. The party accused of a breach can argue that the reliance was justified and that the other party cannot reverse course and declare a breach.

Is collateral estoppel a defense?

Collateral estoppel may be asserted by any party. It applies only when the party against whom it is asserted had a full and fair opportunity to litigate the issue in the previous lawsuit or proceeding. Collateral estoppel is an affirmative defense in most jurisdictions and should be asserted as such.