Promissory estoppel is an equitable theory of recovery that permits enforcement of a promise when one or more elements necessary to create an enforceable contract are missing. The elements of promissory estoppel are generally: (1) a promise; (2) foreseeability of reliance by the promisor; (3) substantial and reasonable reliance by the promisee to its detriment; and (4) enforcing the promise is necessary to avoid injustice.
In South Dakota, promissory estoppel serves as a legal remedy that allows a court to enforce a promise even when a formal contract does not exist or certain elements for a binding contract are absent. The doctrine is based on the principles of equity and fairness, aiming to prevent injustice that would result from not enforcing the promise. The elements required for promissory estoppel in South Dakota include: (1) a clear and definite promise, (2) the promisor's expectation or foreseeability that the promisee will rely on the promise, (3) actual and reasonable reliance on the promise by the promisee, and (4) a detriment suffered by the promisee as a result of their reliance. If these elements are met, South Dakota courts may enforce the promise to the extent necessary to remedy the harm caused by the reliance and to prevent injustice. This doctrine is particularly relevant in situations where parties have acted upon a promise that lacks the formalities of a contract, such as consideration.