Short answer
If your employer has seriously breached your employment contract — by demoting you without reason, cutting your pay, or creating an intolerable working environment — you may be able to resign and claim constructive dismissal. You must have at least two years' continuous employment and must resign promptly after the breach.
Constructive dismissal is legally treated as a dismissal, not a resignation. However, the burden is on you to prove the breach was serious enough and that you resigned because of it — not for other reasons.
1 The rule
Constructive dismissal is defined in the Employment Rights Act 1996. It occurs when an employee is entitled to terminate their contract by reason of the employer's conduct — typically a serious or fundamental breach of contract.
"An employee is dismissed by his employer if… the employee terminates the contract under which he is employed (with or without notice) in circumstances in which he is entitled to terminate it without notice by reason of the employer's conduct."Read the official text
The breach must be a fundamental breach — one that goes to the heart of the employment relationship. Typical examples include unilateral changes to pay, duties, or location; bullying or harassment; and failure to address grievances about a toxic working environment. The employer's breach of the implied term of mutual trust and confidence is the most commonly relied upon ground.
2 What you can do now
- Identify the employer's breach
Write down exactly what your employer did, when, and what term of your contract (express or implied) it breached. The most common grounds are: unilateral reduction of pay; unjustified demotion; bullying or harassment not addressed by management; moving you to an incompatible role; and persistent failure to follow grievance procedures. The conduct must be serious — inconvenience or unfairness alone is not enough.
- Consider raising a grievance first
Unless the relationship has broken down irretrievably, raise a formal grievance in writing before resigning. This gives the employer a chance to fix the problem and creates a documented record. Courts look favourably on employees who gave their employer an opportunity to remedy the breach. Follow the grievance procedure in your contract or the ACAS Code of Practice.
- Resign promptly if the breach continues
Once you decide to resign on grounds of constructive dismissal, act promptly — usually within a few weeks of the breach or of the employer's failure to resolve your grievance. Continuing to work for months after the breach without protest can be treated as you having "affirmed" the contract and waived your right to claim.
- Resign in writing, stating your reasons
Write a resignation letter clearly stating that you are resigning because of the employer's breach of contract and that you consider yourself to have been constructively dismissed. Do not just say "I resign" — you need a record of the reason. Keep a copy. Send it by email and ask for read receipt, or by recorded post.
- Notify ACAS for Early Conciliation
Before submitting an Employment Tribunal claim you must notify ACAS for Early Conciliation. Do this as soon as possible after resigning — the three-month clock runs from your resignation date. Notify online at acas.org.uk. The ACAS officer will attempt to settle the dispute before the tribunal stage.
3 When this does not apply
- You have been employed for less than two years (unless the breach was for an automatically unfair reason such as whistleblowing or pregnancy).
- You resigned for personal reasons unrelated to the employer's conduct, or you had already decided to leave before the breach occurred.
- You delayed resigning for too long after the breach — courts may find you affirmed the contract.
- You accepted an express or implied variation of your contract — for example, by continuing to work at a lower grade without protest.
4 Common questions
How do I prove the employer's conduct was bad enough?
You must show the employer seriously breached a contractual term — either an express term (written in your contract) or an implied term. The most important implied term is the duty of mutual trust and confidence — the employer must not, without reasonable cause, act in a way calculated or likely to destroy or seriously damage the trust and confidence between employer and employee. Landmark cases include <a href="https://www.bailii.org/uk/cases/UKHL/1977/11.html" target="_blank" rel="noopener noreferrer"><em>Western Excavating (ECC) Ltd v Sharp</em> [1978] EWCA Civ 4</a> (breach must be serious) and <a href="https://www.bailii.org/uk/cases/UKHL/1999/2.html" target="_blank" rel="noopener noreferrer"><em>Malik v BCCI</em> [1997] UKHL 23</a> (trust and confidence). Gather contemporaneous written evidence — emails, messages, meeting notes.
Can I claim if the breach was a series of smaller incidents rather than one big event?
Yes. A series of actions that individually might not constitute a fundamental breach can, cumulatively, amount to one. This is called the "last straw" doctrine. If the final incident — even a relatively minor one — is the last in a series of related breaches, you may be able to rely on the whole course of conduct. The <a href="https://www.acas.org.uk/constructive-dismissal" target="_blank" rel="noopener noreferrer">ACAS guide to constructive dismissal</a> explains this concept clearly.
Do I still get redundancy pay if I resign claiming constructive dismissal?
If your employer's breach was the genuine reason for the resignation and you satisfy the two-year qualifying period, you are treated as having been dismissed — not resigned — and you retain your right to statutory redundancy pay, notice pay, and any other dismissal entitlements. However, the employer may argue the circumstances do not meet the legal test. If they refuse to pay, you will need to make a tribunal claim within three months of the resignation date — starting with <a href="https://www.acas.org.uk/early-conciliation" target="_blank" rel="noopener noreferrer">ACAS Early Conciliation</a>.
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