Tennessee breach of contract cases can sometimes be defended successfully by asserting the defense of mutual mistake. Here is a hypothetical example of a case in which the defense of mutual mistake would squarely apply: Seller sells a residential lot to Buyer. At the time Buyer and Seller sign their contract, unbeknownst to both, the property is in a flood plane and is unsuitable for a home.
Under the above hypothetical facts, both Buyer and Seller made a mutual mistake as to a material matter at the time they made their contract. Under Tennessee law, if the Buyer found out after the parties made their contract that the lot was unsuitable for a home; Buyer refused to pay; and, Seller sued buyer for breach of contract, then, Buyer could successfully defend those claims by pleading mutual mistake.
It is probably unlikely that the same facts as the above hypothetical will ever occur in a Tennessee case because of the prevalence of real estate contracts which have “as is” clauses in them. Such “as is” clauses in real estate contracts have taken away the defense of mutual mistake for more than one buyer of real estate in Tennessee.
Under Tennessee law, even where both parties entered into a contract under a mutual mistake about a material fact, if the contract allocated the risk of that mutual mistake to one party, that party cannot use the doctrine of mutual mistake. How does the risk of a mutual mistake become allocated to one of the parties? The answer is that “as is” and similar clauses do just that.