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Estoppel

Estoppel prevents someone from taking a position in court that contradicts something they previously said or did, if that contradiction would unfairly harm the other party.

What it actually is

Estoppel is a legal principle that bars a person from asserting a fact or right that is inconsistent with a prior statement, action, or silence, especially when the other party has relied on that prior conduct to their detriment. It arises in various contexts, such as contract disputes, property claims, or insurance cases, often as an affirmative defense or a basis to stop litigation on a particular issue.

Why it matters in your case

If estoppel applies, you may be unable to argue a key point, even if you believe it is true, because your earlier words or actions convinced the other side to act in a way that now makes it unfair to change your position. This can force you to lose a case or limit your arguments, making it critical to understand what you have said or done before the lawsuit.

The common misunderstanding

People often think estoppel only applies when there is a written promise, but it can arise from spoken statements, silence when there is a duty to speak, or even conduct. It is not about punishing dishonesty but preventing unfairness when someone changes their story.

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.