Unjust Enrichment in Minnesota

What Unjust Enrichment Means in Minnesota

Unjust enrichment is a Minnesota equitable claim that lets you recover the value of a benefit another party received and cannot fairly keep, even when you never signed a contract. Minnesota courts describe it as a quasi-contract or a contract implied in law: the law supplies an obligation to pay that the parties never wrote down. As the Minnesota Supreme Court put it in Caldas v. Affordable Granite & Stone, Inc., unjust enrichment “is an equitable doctrine that allows a plaintiff to recover a benefit conferred upon a defendant when retention of the benefit is not legally justifiable.”

The claim comes up constantly in Minnesota contract and business disputes: a job started before the paperwork was signed, improvements made to someone else’s property, money paid by mistake, or work performed on a promise that fell through.

The Elements of an Unjust Enrichment Claim

To establish unjust enrichment in Minnesota, you must prove that the other party knowingly received a benefit and that keeping it would be unjust. The Minnesota Supreme Court stated the standard in ServiceMaster of St. Cloud v. GAB Business Services, Inc.:

To establish an unjust enrichment claim, the claimant must show that the defendant has knowingly received or obtained something of value for which the defendant “in equity and good conscience” should pay.

Because unjust enrichment is a quasi-contract, Minnesota courts also frame the test in three parts. In Acton Construction Co. v. State, the court described the elements of a quasi contract as a benefit conferred on the defendant, the defendant’s appreciation and knowing acceptance of that benefit, and retention of the benefit under circumstances that make it inequitable to keep it without paying its value.

A benefit alone is never enough. As the Supreme Court warned in First National Bank of St. Paul v. Ramier, unjust enrichment claims “do not lie simply because one party benefits from the efforts or obligations of others.”

What “Unjust” Actually Requires

This is where many descriptions of the claim stop short. It is not enough that the other party came out ahead: you must show the enrichment was wrongful in a legal sense. Minnesota recognizes two ways to meet that bar.

The first is illegal or unlawful conduct. The Ramier court held that a party must be enriched “in the sense that the term ‘unjustly’ could mean illegally or unlawfully.”

The second is broader. Minnesota has extended the claim to conduct that is morally wrong, even without illegality. In Schumacher v. Schumacher, the Court of Appeals explained that “the cause of action for unjust enrichment has been extended to also apply where . . . the defendants’ conduct in retaining the benefit is morally wrong.” The Minnesota Supreme Court confirmed both branches in 2023, holding that the plaintiff must show the defendant was enriched “illegally or unlawfully,” or in a manner that is morally wrong. See Herlache v. Rucks, No. A21-1427 (Minn. 2023).

Unjust Enrichment Does Not Override a Contract

Unjust enrichment fills a gap; it does not rewrite a deal you already have. Minnesota courts will not grant an equitable claim where a valid contract or an adequate legal remedy already governs the dispute. The Caldas court was explicit: unjust enrichment “does not apply when there is an enforceable contract that is applicable.”

That is why the claim matters most when there is no enforceable contract, when a contract is void, or when the person who benefited was never a party to the agreement. If you do have a contract, your first path is usually a breach claim. See breach of contract remedies in Minnesota.

How Minnesota Measures What You Recover

An unjust enrichment award is measured by what the other party gained, not by what you lost. In Herlache, the Minnesota Supreme Court confirmed a rule that dates back over a century: the measure of relief “is based on what the person allegedly enriched has received, not on what the opposing party has lost.” Because the claim is equitable, the court has broad discretion to shape a remedy that does justice on the specific facts, which can include the money you paid, the value of services you provided, or the benefit conferred on the property you improved.

Example: Schumacher v. Schumacher

Schumacher v. Schumacher, a 2001 Minnesota Court of Appeals decision, shows how the claim works when a family arrangement breaks down. Daniel Schumacher and his family moved to Finland, Minnesota to run the Trestle Inn, a bar and restaurant his parents owned. He was not paid a salary, but kept the profits, and he claimed his parents had promised to leave him the business and adjoining land when the first parent died. Relying on that promise, he used his own money to build a home on the land, install a well, and make other improvements. When his parents moved to sell the property, he sued.

The district court dismissed his unjust enrichment claim. The Court of Appeals reversed and sent it back for trial, holding that a jury could find the parents were unjustly enriched: Daniel had made substantial improvements to their land, they knew of the improvements and did not discourage them, and they benefited from them. The case is a textbook pattern for the claim, valuable work poured into another person’s property on the strength of a promise the law would not otherwise enforce. A related equitable theory, promissory estoppel, often travels alongside unjust enrichment in these disputes. See promissory estoppel and detrimental reliance.

Quasi-Contract and Quantum Meruit

Unjust enrichment sits within a family of related equitable claims. Quasi-contract is the broader label Minnesota courts use for the implied-in-law obligation to pay for a benefit. Quantum meruit, meaning “as much as earned,” is the measure often used to value services rendered without a contract. For how these fit together, see quasi-contracts and quantum meruit.

How Long You Have to File

Minnesota’s general six-year limitations period applies to unjust enrichment. Because the claim rests on an implied-in-law obligation, it falls under Minnesota Statutes section 541.05, subdivision 1(1), which requires an action “upon a contract or other obligation, express or implied” to be commenced within six years. The deadline generally runs from when the enrichment occurred, so do not wait to evaluate a claim.