Utah Promissory estoppel is a legal principle that prevents a party from going back on a promise they made to another person. The principle is based on the idea that when an individual or organization makes a promise to another person, and they rely on the promise to their detriment, the promise should be prevented from going back on their promise. This is especially true when the promise was made with the expectation that the promise would be held to their word. In the State of Utah, the doctrine of Promissory estoppel is codified in the Utah Code Annotated Section 78B-9-102. There are two types of Promissory estoppel in Utah: traditional Promissory estoppel and equitable Promissory estoppel. Traditional Promissory estoppel applies when a promise is made, the promise relies on the promise to their detriment, and the promise should not be allowed to go back on their promise. Equitable Promissory estoppel applies when a promise is made, the promise relies on the promise to their detriment, and the promise cannot be reasonably expected to go back on their promise. Both types of Promissory estoppel are applicable in the State of Utah, and are used to prevent a party from going back on a promise they made to another person.