What Is Promissory Estoppel? (Elements + Examples)

Promissory estoppel is an equitable doctrine that makes a promise enforceable even without consideration, when the promisee reasonably relied on the promise to their detriment. It prevents the injustice that would result from allowing the promisor to break a promise that someone else has already relied on. Think of it as the law's safety net for promises that don't fit neatly into contract formation.

Under Restatement (Second) of Contracts § 90:

1. A clear and definite promise — vague statements aren't enough
2. Reasonable reliance by the promisee — the promisee must actually rely on the promise, and that reliance must be reasonable
3. Detrimental reliance — the promisee must suffer some detriment as a result of relying on the promise
4. Injustice can only be avoided by enforcement — the court considers whether enforcing the promise is necessary to prevent unfairness

Ricketts v. Scothorn: Grandfather promises granddaughter $2,000 so she can quit her job. She quits. Even though there's no consideration (she didn't bargain for the money), the court enforces the promise because she reasonably relied on it to her detriment.

Job reliance: Employer promises candidate a job. Candidate quits their current position and relocates. Employer rescinds the offer. Promissory estoppel may make the promise enforceable.

Charitable pledges: Many courts enforce charitable donation promises under promissory estoppel if the charity relied on the pledge.

Contract: Requires offer, acceptance, consideration, and capacity. Remedy is expectation damages (put promisee where they would have been if the contract was performed).

Promissory estoppel: No consideration required. Remedy is typically reliance damages (put promisee where they would have been if the promise was never made) — though some courts award expectation damages.

On exams, raise promissory estoppel as an alternative when consideration is weak or absent.

Promissory estoppel is a favorite exam topic because it tests whether you can identify when a promise lacks consideration and then apply the alternative framework. Key signals in a fact pattern:

- A gratuitous promise followed by reliance
- A promise within a family or employment context
- Someone changing their position based on a promise

Always analyze consideration first. Only if consideration fails should you reach promissory estoppel.