Tuesday, 27 October 2026
The Employment Contract That Ends Itself
Most termination situations involve a decision.
Someone chooses to dismiss. The employer weighs the conduct, the performance record, the business case. A letter is issued. The employment ends because the employer decided it should.
Frustration of contract is different.
Frustration is the doctrine that ends an employment contract automatically, by operation of law, when a supervening event makes performance of the contract impossible. Not difficult. Not inconvenient. Impossible.
No one decides. No one exercises discretion. The contract terminates because the law recognises that it cannot continue.
The core principle: impossibility, not hardship
The threshold for frustration is deliberately high.
The doctrine does not apply because continuation has become expensive, disruptive, or commercially unattractive. Many employment situations that feel impossible are not, in the legal sense, impossible at all. They are simply hard.
Frustration applies when a supervening event — one that arises after the contract is formed, is not caused by either party, and goes to the root of the employment relationship — makes performance impossible in law or in fact.
That phrase, “in law or in fact,” is worth pausing on. Impossibility in fact means the employee physically cannot perform the role. Impossibility in law means performing the role would now be unlawful.
Everything short of that does not frustrate the contract.
What kind of events qualify
Courts have found frustration in situations where:
- an employee permanently loses a licence that is legally required to perform the role and that cannot be recovered;
- a permanent physical condition makes performance of the essential functions of the role impossible in any meaningful sense;
- an external event fundamentally transforms what the contract requires, to the point where the original agreement no longer describes what is being asked.
What these examples share is not severity, but irreversibility. The supervening event has destroyed the foundation of the contract, not damaged it, not complicated it, but removed the basis on which it could continue.
Permanence matters
Temporary impossibility rarely frustrates a contract.
If an employee cannot perform their role for several months but is expected to recover, the contract is not frustrated. It is interrupted. Frustration requires that the impossibility be permanent, indefinite with no realistic endpoint, or absolute in nature.
This distinguishes frustration from medical incapacity, where the law accommodates judgment under uncertainty. Frustration tolerates no such uncertainty. The bar is higher. The evidence required to meet it is correspondingly more demanding.
No fault on either side
A defining feature of frustration is the absence of fault.
Neither the employer nor the employee caused the supervening event, controlled its occurrence, or could reasonably have prevented it. This is not a case where someone made the wrong decision. It is a case where the circumstances removed the decision entirely.
Because no one chose to terminate, there is no dismissal in the conventional sense, no show cause process, no domestic inquiry. The contract ends because it has become legally impossible to perform.
That absence of blame can make frustration appear straightforward. It is not. And that perception is exactly where many employers go wrong.
In the next article, I look at why frustration is one of the most scrutinised doctrines in employment law, the risk of courts recharacterising a frustration claim as something else entirely, and what you need to demonstrate if you intend to rely on it.