What is constructive dismissal and when can I claim it?

The short answer

If your employer's conduct seriously breaches your employment contract — and you resign because of it — UK law treats that as a dismissal, not a resignation. Once you've resigned, you can bring an unfair dismissal claim in the Employment Tribunal as if your employer had sacked you. This is constructive dismissal, sometimes called "constructive unfair dismissal."

Three things have to be true:

1. The employer has committed a fundamental breach of contract (also called a "repudiatory breach")
2. You resigned in response to that breach
3. You did not wait too long to resign and so accept the breach

If any of those three is missing, the claim usually fails.

What counts as a fundamental breach

The most common pathway is breach of the implied term of mutual trust and confidence — the rule, established in Malik v BCCI and applied in thousands of cases since, that neither party will act in a way "calculated or likely to destroy or seriously damage the relationship of trust and confidence" between employer and employee.

Examples that have been held to be fundamental breaches:

• Withholding contractually due pay or commission
• Demoting an employee without their agreement
• Physical assault or aggressive verbal abuse by a manager
• Failing to properly handle a grievance
• Subjecting the employee to discrimination or harassment
• A single severe humiliation, or a series of smaller incidents that cumulatively destroy trust
• Unjustified disciplinary action
• Ignoring a serious workplace safety concern

Breaches of express terms of the contract — pay, hours, role, location — usually also qualify if they're serious.

Real cases showing what works

In constructive dismissal after assault by managing director, a vehicle technician was physically assaulted by his managing director on 10 November 2021. He resigned two days later. The employer conceded liability, and the tribunal awarded £16,963 plus a 25% ACAS uplift. Physical assault is almost the textbook example of a fundamental breach — and the quick resignation removes any argument that he had "affirmed" (accepted) the breach.

A pattern of breaches over time also works. In HGV driver with 21 years' service wins constructive dismissal and disability discrimination claim against Asda, the driver developed Parsonage Turner Syndrome and was given written work restrictions. Asda repeatedly allocated him to duties outside those restrictions, placed him in a capability process, and mishandled his grievance. He resigned in March 2022. Tribunal: cumulative fundamental breach, £163,485 award.

Withholding pay is among the cleanest forms of breach. In constructive dismissal after commission withheld and ultimatum given, an employee with eight years' service had sales commission withheld, was given an ultimatum to pay money to the employer or be treated as resigned, and was told to stay home without pay. Tribunal: fundamental breach. £55,267 award.

Discrimination can also amount to a fundamental breach. In accent mimicry and victimisation: ophthalmic technician wins race discrimination claim against Moorfields, the claimant was subjected to racist accent mimicry, complained, and was then victimised for complaining. She resigned in December 2020. The tribunal found direct race discrimination, harassment, and victimisation — and that the cumulative conduct amounted to a constructive dismissal.

And in operations manager with asthma placed on short-time work during lockdown, an operations manager with asthma raised health and safety concerns at the start of COVID and was placed on 8 hours' work a week. The tribunal found this was a detrimental response to her concerns, amounting to discrimination arising from disability, and a fundamental breach. £27,871 award.

When constructive dismissal claims fail

Most failed claims fall into one of three buckets:

1. The conduct wasn't a fundamental breach

A reasonable management instruction the employee disliked isn't a breach. Being criticised, having a poor performance review, being moved within a similar role, or being asked to relocate to a different floor — these are usually not fundamental breaches, even if the employee finds them frustrating.

2. You didn't resign in response to the breach

This is the silent killer of constructive dismissal claims. If the tribunal finds that the real reason you resigned was something else — a new job, retirement, a personal decision — your claim fails even if the employer's conduct was poor.

The clearest example is 44 years' service but constructive dismissal claim fails: retirement timing was key. A senior sales ledger clerk resigned after 44 years and claimed constructive dismissal because of workload. The tribunal found she had already planned to retire before the workload changed. She didn't link the workload to her resignation until after she'd left. Claim dismissed.

The lesson: tell your employer at the time of resignation that you're resigning because of the breach. Put it in writing. A resignation letter that mentions the breach is not a guarantee of success — but a resignation letter that doesn't mention it is often fatal to the claim.

3. You waited too long

If you continue to work for the employer for too long after the breach without making clear that you're resigning over it, you can be held to have affirmed the contract — accepted the breach and chosen to continue. There is no fixed time limit, but the longer the gap, the harder the claim.

A short delay — a few weeks while you take advice or look for another job — is usually fine. Several months without protest is risky. A year is almost always too long.

Raising a grievance over the breach is one of the best ways to "preserve" your position while you decide what to do. It signals that you're not accepting the breach, and gives the employer a chance to fix it.

What you actually win

A successful constructive dismissal claim is treated like an ordinary unfair dismissal claim. You get:

• Basic award (calculated like statutory redundancy)
• Compensatory award (financial loss, capped at the lower of 52 weeks' pay or the statutory maximum)

If discrimination is also in play, you can add:

• Injury to feelings under the Vento bands (currently up to about £58,700)
• Uncapped compensation for financial loss

There is no notice pay with constructive dismissal — because you resigned, you don't get the notice you'd have got if you'd been sacked. Some claimants are surprised by this.

What about the two-year service requirement?

Yes — for ordinary constructive unfair dismissal, you need two years' continuous service, just like a normal unfair dismissal claim. Below that you'd need to fit into one of the automatically unfair categories or rely on discrimination. See "Can I claim unfair dismissal with less than two years' service?" for the full picture.

Practical steps before resigning

1. Raise a formal grievance in writing about the conduct that's destroying trust. This protects your position and gives the employer a chance to fix it.
2. Wait for the grievance outcome if it can be heard reasonably promptly. Resigning while a grievance is still being heard can weaken your case.
3. Take legal advice before resigning. Once you've resigned, you can't undo it.
4. Resign in writing and state the reason — refer to the specific breaches and to the fact that you're resigning because of them.
5. Contact ACAS for Early Conciliation within three months less one day of your last day. Deadlines are strict.

See real cases

Six constructive dismissal decisions — five where the claim succeeded and one where it didn't, illustrating where the line is drawn.

Disclaimer

This is general legal information, not legal advice. Constructive dismissal cases turn very heavily on their specific facts. Before resigning over an employer's conduct, speak to ACAS (0300 123 1100), Citizens Advice, a trade union, or a qualified employment solicitor.