legal doctrine of "money had and received" is a historical common law claim

[White Wolf]

The legal doctrine of "money had and received" is a historical common law claim, originating from the action of indebitatus assumpsit, to recover money that another person has received to your use but should not keep, typically due to mistake of fact, failure of consideration, or unjust enrichment. While the historical forms of action are abolished, the underlying principle remains relevant as a claim to recover unjustly held funds, even if the defendant was not at fault.

What it is
A claim for unjust enrichment:
The core principle is that no one should be allowed to unjustly benefit from another's loss, especially when it comes to money.
Historical roots:
It was a specific common law action to recover money paid under a mistake or without a valid legal basis.
Modern application:
In modern legal systems, the concept is often expressed through the broader principle of unjust enrichment, which provides a basis for recovering mistakenly paid or unfairly retained money.
When it applies

Mistake:
Money was paid under a mistake of fact or law.
Failure of consideration:
The payment was made, but the reason for the payment (the "consideration") failed.
Unjust enrichment:
The recipient's retention of the money is unfair or unjust, regardless of their fault.
"Practical compulsion":
In some circumstances, a payment made under "practical compulsion" – where there were no reasonable alternatives – can be recovered, though this is a fact-specific analysis.

Key characteristics
Strict liability: The action does not depend on the defendant's fault or intention.
Focus on money: The claim is specifically for money, not other types of benefits.
Tracing: In some early cases, the ability to trace the specific funds was important, but this became difficult with modern banking systems.

Example scenarios
Mistaken payment:
An insurance company pays an insured's executor who is not entitled to the funds because the policy had lapsed.
Agent's failure to remit funds:
A real estate agent receives money from a client but fails to pass it on to the principal.
Payment under duress:
Paying a disputed toll to avoid immediate blockage of a necessary route, a situation that can be seen as a practical compulsion.

How it relates to modern law
Replaced by unjust enrichment:
The legal action for money had and received is now largely superseded by the more general doctrine of unjust enrichment, which achieves the same goal of rectifying unfair financial gains.

Remedial constructive trust:
In some situations, a remedial constructive trust can be used as an equitable remedy to address unjust enrichment, which can be an alternative to a money had and received claim.