Can promissory estoppel be used as a sword?

Asked by: Dr. Leonora Keebler I  |  Last update: June 8, 2026
Score: 4.4/5 (69 votes)

In many common law jurisdictions, especially English law, promissory estoppel generally cannot be used as a sword (an offensive tool to start a new claim); it functions as a shield to prevent someone from enforcing strict legal rights they promised not to, typically used defensively in response to a lawsuit. However, in jurisdictions like Australia, it can sometimes be used as a sword to create a cause of action, effectively allowing a promisee to enforce a promise even without consideration, though this is more controversial and not universally accepted.

Is promissory estoppel a sword or shield?

Promissory estoppel operates as a shield, not a sword. This means the doctrine can only be used as a defence, not as the basis for bringing an independent claim. In other words, it does not create new causes of action, it only prevents a party from enforcing their rights when it would be unfair to do so.

Can promissory estoppel be used as a defense?

Estoppel may be used as a bar to the re-litigation of issues or as an affirmative defense. For estoppel in contract law, promissory estoppel is often applied where there is a promise or an agreement made without consideration.

What are the limitations of promissory estoppel?

Limitation on Promissory Estoppel

There has to be an existing legal relationship between the parties. Must have been (detrimental) reliance on the promise. Cannot be inequitable for promisor to go back on the promise. A "shield not a sword"

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.

Promissory Estoppel: Sword v. Shield

19 related questions found

What are the three types of estoppel?

by representation of fact, where one person asserts the truth of a set of facts to another; promissory estoppel, where one person makes a promise to another, but there is no enforceable contract; and. proprietary estoppel, where the parties are litigating the title to land.

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 the three requirements for promissory estoppel?

Promissory Estoppel

  • The promisor should reasonably expect to induce action or forbearance from the promisee;
  • Such action or forbearance is in fact induced; and.
  • Injustice can be avoided only by enforcement of the promise.[

Can I sue for promissory estoppel?

A plaintiff bringing a breach of contract claim may plead promissory estoppel in the alternative, along with other equitable claims. Court Opinions. That way, if the court finds no valid contract existed, a plaintiff can still recover under promissory estoppel if the required elements are met.

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 an equitable 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 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 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; ...

Can equitable estoppel be used as a sword?

Typically, equitable doctrines are used as shield rather than a sword, as estoppels are often raised to defend an action rather than to found one.

How to argue promissory estoppel?

One core strategy for defending against promissory estoppel is emphasizing that there was a formal contract between the parties, so the claim for promissory estoppel cannot go forward. Providing the contract or providing evidence about the contract's existence would both support this defense.

What is the sword and shield doctrine?

In general, the sword and shield doctrine is meant to balance the interests of parties in contractual dealings and ensure that both parties are held to the same standard of performance.

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 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.

What are some famous estoppel cases?

Cases - Collateral estoppel or res judicata

  • Dupree v. Younger. ...
  • Federated Department Stores, Inc. v. ...
  • Ford v. Ford. ...
  • Lance v. Dennis. ...
  • Lucky Brand Dungarees Inc. v. ...
  • Parklane Hosiery Company, Inc. v. ...
  • Semtek International, Inc. v. ...
  • Taylor v. Sturgell.

Can promissory estoppel only be used as a Defence?

In English law, promissory estoppel is not a cause of action; it acts as a 'shield, not a sword'. This means it can only be used as a defence when a party tries to enforce rights they had promised not to.

What is the statute of limitations on promissory estoppel?

Courts will often also ask whether it would be unjust not to enforce the promise between the parties. Like many contracts, there is a four year statute of limitations to bring an action for promissory estoppel.

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.

What is estoppel in layman's terms?

What is estoppel in simple terms? Estoppel is a legal restraint placed on someone to prevent him from contradicting his own previous statement or assertion for gain. When someone is estopped from asserting a right, it is because of a contradictory position taken earlier, on which another relied to his detriment.

What is detrimental reliance in law?

Detrimental reliance refers to a legal concept in contract law where one party suffers harm or incurs a loss as a result of relying on the promises or representations made by another party.

What damages are recoverable in a case of promissory estoppel?

Damages in a promissory estoppel case are usually equal to the amount of money lost due to the employee's reliance on the employer's promise, including those arising directly from the breach as well as those that are the consequences of special circumstances known by, or reasonably supposed to have been contemplated by ...