Think your employer has forced you to resign? Learn what constructive dismissal means, how to prove it, and when to act. Free expert guide from National Employees Union.
Most employees think of dismissal as something an employer does to them — a letter, a meeting, a decision made by someone above. Constructive dismissal is different. It happens when the employee resigns, but the resignation is forced by the employer’s conduct. The employer did not fire you. They made it impossible for you to stay. The law treats that resignation as a dismissal, and the same protections apply. This guide explains what constructive dismissal means, what you need to prove it, and the steps you must take to protect a claim.
Contents
- What is constructive dismissal?
- The legal test
- Examples of employer conduct
- What you need to prove
- Before you resign
- How to resign and preserve your claim
- Making a claim
- FAQs
- How National Employees Union can help
What is constructive dismissal?
Constructive dismissal is defined in Section 95(1)(c) of the Employment Rights Act 1996. An employee is treated as dismissed if they terminate the contract — with or without notice — in circumstances where they are entitled to terminate it without notice because of the employer’s conduct.
In plain terms: your employer has done something so serious that you resign in response. The law says you did not choose to leave. You were pushed.
Constructive dismissal claims are a form of unfair dismissal. The same qualifying criteria apply — you normally need two years’ continuous service, unless the reason relates to an automatically unfair ground.
The legal test
The test has three elements, established by the Court of Appeal in Western Excavating v Sharp [1978]:
1. A fundamental breach of contract
Your employer must have breached a term of your employment contract — and the breach must be fundamental, meaning it goes to the root of the contract. Minor issues do not qualify. The breach must be serious enough to justify treating the contract as at an end.
The most commonly relied-upon term is the implied term of mutual trust and confidence. Every employment contract contains this term, whether written down or not. It requires that neither party, without reasonable and proper cause, conducts itself in a manner calculated or likely to destroy or seriously damage the relationship of trust and confidence.
2. Resignation in response to the breach
You must resign because of the breach. If you resign for unrelated reasons — a better job offer, personal circumstances, a general desire to leave — the claim fails. The breach must be the effective cause of the resignation.
3. No delay (affirmation)
You must not wait too long. If you continue working for an extended period after the breach without objection, the law may treat you as having accepted the breach — a concept called affirmation. Once you affirm the breach, you lose the right to rely on it as a ground for resignation.
There is no fixed time limit for affirmation. Courts assess the circumstances — whether you protested, whether you were exploring internal remedies, whether you had practical reasons for delay. But the risk increases with each passing week. Act promptly once the breach becomes clear.
Examples of employer conduct
These are situations that have supported constructive dismissal claims:
- Unilateral pay cut — reducing your salary without agreement. Pay is a fundamental contractual term. Changing it without consent is a breach. See our guide on employers changing contracts.
- Demotion without justification — removing responsibilities, downgrading your role, or assigning you work far below your position without a genuine reason.
- Sustained bullying or harassment — repeated conduct that creates a hostile environment, where the employer knew or should have known and failed to act.
- Failure to investigate a grievance — you raised a formal grievance about a serious issue and your employer ignored it, delayed it beyond reason, or conducted a sham investigation.
- Failure to pay wages — withholding salary, sick pay, or other contractual payments.
- Unreasonable disciplinary action — imposing a sanction that is entirely disproportionate, or pursuing a disciplinary process in bad faith.
- Withdrawal of support — an employer removing the tools, training, or management support necessary for you to do your job, then criticising your performance.
- Fundamental change to working conditions — altering your hours, location, or duties in a way that breaches your contract and without your agreement.
A single serious incident can be enough. Alternatively, a series of smaller acts that together amount to a breach of trust — sometimes called the “last straw” — can also found a claim. The last act need not be serious on its own, provided the cumulative effect is.
Imposing new terms without agreement is one example, covered in whether your employer can change your contract.
What you need to prove
Constructive dismissal claims carry a higher burden than standard unfair dismissal. In standard unfair dismissal, the employer must show the reason for dismissal was fair. In constructive dismissal, you must show the employer’s breach was fundamental and your resignation was a direct response to it.
This means you need evidence. Specifically:
- Records of the breach — emails, letters, policies, witness accounts, records of meetings. If the breach is a pattern of conduct, document each incident with dates and details.
- Evidence that you objected — records showing you raised the issue, filed a grievance, or otherwise put your employer on notice. Resigning without having raised the issue makes it harder (though not impossible) to show the breach was the cause.
- Evidence of timing — the closer the resignation is to the breach (or the final straw), the stronger the case. Months of continued employment after the breach — without protest — suggests affirmation.
- Your resignation letter — this is a critical document (see below).
The claim is a form of dismissal, so read it beside the tests for unfair dismissal.
Before you resign
Resignation is irreversible. Once you leave, you lose your income, your contractual position, and your ability to use internal processes. Before you resign, take these steps.
Raise it formally first, using our grievance letter template, because a tribunal will ask whether you did.
Raise a formal grievance
Put your complaint on record through the grievance procedure. This serves two purposes. First, it gives your employer a chance to remedy the breach — a tribunal may ask why you did not exhaust internal options. Second, it creates a paper trail that demonstrates the seriousness of the issue and your employer’s response.
Take legal advice
Speak to a trade union representative or employment solicitor before resigning. They can assess whether the conduct amounts to a fundamental breach, advise on the strength of a claim, and help you plan the timing.
Consider the financial impact
You will lose your income from the date you resign. Legal processes take months. If you resign without another job, you need to be prepared for that gap. A union representative can advise on whether the claim is strong enough to justify the risk.
How to resign and preserve your claim
If you decide to resign, the resignation letter is the most important document in your claim. It must make clear that you are resigning in response to your employer’s conduct.
What to include
- State that you are resigning with immediate effect (or with notice, if you prefer — but immediate effect strengthens the claim by demonstrating the breach is so serious you cannot continue).
- Identify the specific conduct that constitutes the breach — do not be vague.
- State that the conduct amounts to a fundamental breach of your contract, specifically the implied term of trust and confidence.
- State that you are treating the contract as terminated by reason of your employer’s breach.
- Confirm that you consider yourself constructively dismissed.
What to avoid
- Do not cite personal reasons, a new job, or any cause other than the employer’s conduct. If you give multiple reasons, the employer will argue the breach was not the effective cause.
- Do not use emotional language. State the facts. The resignation letter may be read aloud at a tribunal hearing.
Making a claim
Constructive dismissal is claimed as a form of unfair dismissal. The process is the same:
- ACAS Early Conciliation — you must contact ACAS before submitting a tribunal claim. This is free and confidential. It pauses the time limit.
- ET1 claim form — if conciliation does not resolve the matter, submit your claim to the Employment Tribunal.
- Time limit — you have three months minus one day from the date of your resignation. This deadline is strict.
Compensation follows the same structure as standard unfair dismissal: a basic award (calculated like redundancy pay) and a compensatory award (covering financial losses). See the compensation section in our unfair dismissal guide.
Every claim starts with ACAS Early Conciliation, set out in our step-by-step tribunal guide.
Your employer may offer terms to end it early, which our guide to settlement agreements helps you assess.
Before a tribunal will accept your claim, you must notify ACAS Early Conciliation.
FAQs
Can I claim constructive dismissal without raising a grievance first?
Technically, yes — there is no legal requirement to grieve before resigning. But an Employment Tribunal may reduce your compensation by up to 25% if you did not follow the ACAS Code by raising the issue through a grievance first. Raise a grievance wherever possible. It strengthens your position and creates a record.
What if my employer offers to fix the problem after I resign?
Once you have resigned, the contract is terminated. An offer to remedy the breach after the fact does not undo the resignation unless you agree to withdraw it. If the offer is genuine and the solution is acceptable, you can negotiate a return — but do so with advice. Withdrawing a constructive dismissal resignation resets the clock and may weaken a future claim if the same issues recur.
Can I claim constructive dismissal with less than two years’ service?
Only if the reason for the breach relates to an automatically unfair ground — for example, pregnancy, trade union membership, whistleblowing, or asserting a statutory right. Otherwise, two years’ continuous service is required.
Is constructive dismissal hard to prove?
It is harder than standard unfair dismissal because the burden of proof is on you. You must demonstrate the breach, show it was fundamental, prove your resignation was a response to it, and show you did not affirm the breach by waiting too long. Strong evidence and a clear resignation letter are essential. This is exactly why taking professional advice before you resign is critical.
How National Employees Union can help
Constructive dismissal is one of the most complex areas of employment law. The decision to resign — and the timing of that decision — determines whether you have a claim. Taking advice before you act protects your position.
National Employees Union members get:
- Assessment of your situation — an honest evaluation of whether the conduct amounts to a fundamental breach
- Advice on timing — when to grieve, when to resign, and when to wait
- Help drafting the grievance and the resignation letter — both are critical documents
- ACAS Early Conciliation support
- Representation at the [Employment Tribunal](/blog/employment-tribunal-guide/) if the claim proceeds
- Negotiation of [settlement agreements](/blog/settlement-agreements/) where the employer offers one
The difference between a successful claim and a failed one is often the advice taken before the resignation.
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Written by the National Employees Union team. We advise on constructive dismissal claims across the UK. This guide is reviewed regularly and was last updated in August 2026. For advice on your specific situation, contact us.
