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Promissory Estoppel
Promissory estoppel is a legal principle that allows you to enforce a promise someone made to you, even if there was no formal contract, if you relied on that promise to your detriment.
What it actually is
It arises when a promisor makes a clear promise, the promisee reasonably relies on that promise, and the promisee suffers a loss if the promise is not kept. Courts use it to prevent injustice by holding the promisor to their word, even though traditional contract requirements like consideration may be missing. You would typically raise it as an affirmative defense or counterclaim if the other party tries to back out of a promise.
Why it matters in your case
If you are in a lawsuit and the other side denies a contract existed, promissory estoppel can give you a way to still recover damages or force performance. It matters because it may allow you to win your case even when you cannot prove a valid contract—but you must show you actually relied on the promise.
The common misunderstanding
Many people think promissory estoppel is the same as a contract, but it is not—it is a substitute for a contract when formalities are missing. Also, it does not apply to every broken promise; only those where your reliance was reasonable and foreseeable.
Get the actual rule
Definitions are orientation; rules are authority
This page explains the concept. When it matters to your case, read the rule that governs it in your court — we hold Texas, federal and Washington court rules word for word, and every state's official resources are on the state pages. If someone cites a case at you, check that it exists first.
Related
Terms that travel with this one
General explanation, not legal advice, and not specific to any state — procedures and deadlines vary by jurisdiction and court. If you can get a lawyer or free legal aid, do: every real option.