The basic principle is that anyone enriched at another's expense without a legal cause must return what they gained. This fundamental rule of justice is regulated by the Kuwaiti Civil Code as an independent source of obligation.
Not compensation: an unjust-enrichment claim differs from a tort claim — it does not require proof of fault, only enrichment without a lawful cause.
Contents
1) The Concept of Unjust Enrichment
- Principle: anyone enriched without lawful cause at another's expense must return the enrichment.
- Independent source: a fourth source of obligation alongside contract, tort and statute.
- Justice: prevents one person from gaining at another's expense without legal justification.
- Subsidiary claim: the enrichment claim is inadmissible if the claimant has another remedy (contractual or tortious).
Legal basis: Articles 262 et seq. of the Kuwaiti Civil Code govern unjust enrichment and undue payment.
2) Conditions for the Claim
- Defendant's enrichment: they must have obtained a benefit (material or moral).
- Claimant's impoverishment: the claimant must have suffered a loss or been deprived of a gain.
- Causation: the enrichment must result from the impoverishment — i.e. at the claimant's expense.
- Absence of cause: there must be no legal cause justifying the enrichment (e.g. a valid contract or court order).
- No other remedy: the impoverished party must have no contractual or tortious claim available.
Subsidiary nature: this claim is inadmissible if the claimant can assert their right through contract or tort — it is the remedy of last resort.
3) Undue Payment
The most important practical application of unjust enrichment:
- Definition: anyone who pays a sum not owed may recover it from the recipient.
- Mistake in payment: whether the mistake was one of fact (believing a debt existed) or of law (not knowing the debt was extinguished).
- Payment on another's behalf: paying someone else's debt believing it to be one's own — recovery lies against the creditor.
- Disappearance of cause: payment made on a basis that later fails — e.g. a contract rescinded after payment.
Common example: double payment — paying an invoice twice by mistake entitles the payer to recover the excess. See compensation and civil claims.
4) Scope of Recovery
- Rule: the enriched party must return the lesser of two values — their enrichment or the other's impoverishment.
- Material enrichment: return of the sum or the thing in kind.
- Moral enrichment: e.g. benefit from a service — the court assesses its value.
- Fruits and interest: the enriched party must return fruits from the date of demand.
Not full compensation: recovery is capped at the lesser value — the impoverished party may lose part of their loss if the other's enrichment was smaller.
5) Good Faith and Bad Faith
Enriched party in good faith
- Returns only what remains at the time of demand.
- Not liable for what was consumed in good faith.
- Returns fruits from the date of demand only.
- Does not bear default interest.
Enriched party in bad faith
- Returns everything gained or its value.
- Liable for what was consumed or destroyed.
- Returns fruits from the date of enrichment.
- Bears default interest.
6) Limitation Periods
- Short period: the claim is time-barred after three years from the day the impoverished party became aware of the right to recover.
- Long period: in all cases, fifteen years from the date the right arose.
- Suspension: limitation is suspended for the usual causes (minority, insanity).
- Interruption: by judicial demand or acknowledgment.
Do not delay: the longer the wait, the harder it becomes to prove the enrichment and its value — act as soon as you discover it. See procedural defences and limitation.
7) Practical Applications
- Building on another's land: a good-faith builder on another's land is entitled to compensation for the value of the building.
- Tenant's improvements: a tenant who makes improvements with the owner's consent may recover their value.
- Double payment: paying the same bill or instalment twice.
- Services without a contract: rendering a service without a contract — e.g. rescuing another's property.
- Contract rescission: when a contract is rescinded after partial performance, each party recovers what was delivered.
Construction: a contractor who completes extra work outside the contract and enriches the owner may claim compensation on an enrichment basis. See construction contracts.
8) Practical Guidance
For those seeking recovery
- Document the payment or service you provided.
- Prove there is no legal cause for the enrichment.
- Act before the limitation period expires.
- Consult a lawyer — the claim has precise conditions.
For those facing a claim
- Prove a legal cause for the enrichment (contract, judgment).
- Assert good faith if you consumed the amount.
- Plead limitation if the demand is late.
- Verify the claimant has no other remedy.
Paid a sum by mistake or facing an unjust-enrichment claim? Contact Attorney Meshari Obaid Al-Enezi — Yumnaak Law Firm.
