UK · Employment rights

Constructive dismissal examples

Eight common situations that come up in UK constructive dismissal claims, what makes each one stand up at tribunal, and the kind of evidence you need. Read alongside the constructive dismissal pillar for the underlying law.

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1. Pay reduction

A unilateral cut to pay, imposed without consultation and without a contractual basis, is the textbook constructive dismissal case. The size of the cut matters: tribunals have consistently found cuts of around 10% or more to be fundamental breaches when imposed without agreement. Smaller cuts are usually not enough on their own, although they can contribute to a last straw claim if combined with other breaches.

What turns a pay cut into a winning claim is the absence of contractual cover and the absence of consultation. If your contract has a flexibility clause that explicitly permits variations to pay, the employer may have a defence. Genuine consultation that gives the employee a real chance to refuse may also defeat the claim, even where the cut eventually goes ahead, because the employee can be said to have stayed on the new terms.

Evidence needed: the original contract, the letter notifying the change, pay slips before and after, and any correspondence in which you objected. A written grievance raised promptly and rejected by the employer turns this into a strong case.

2. Bullying

Sustained bullying by a manager or colleague that the employer fails to address after a formal complaint breaches the implied term of mutual trust and confidence. One-off rude behaviour usually is not enough. Tribunals look for a pattern of conduct and, critically, the employer’s response.

The strongest cases involve a formal grievance, an investigation that finds against the employee, or no investigation at all, and a continuation of the behaviour after the complaint was made. The employer’s duty is to take reasonable steps. Doing nothing is rarely reasonable.

Evidence needed: dated complaint emails, the formal grievance, the employer’s response, witness names (and whether they are willing to give evidence), and any medical evidence linking the conduct to your health.

3. Harassment

Harassment goes a step beyond bullying and overlaps with discrimination law. Unwanted conduct related to a protected characteristic (race, sex, disability, age, religion, sexual orientation, gender reassignment, pregnancy and maternity, marriage and civil partnership) that has the purpose or effect of creating a hostile, degrading or humiliating environment is harassment under the Equality Act 2010.

Constructive dismissal claims in this category are often run alongside a discrimination claim. The constructive dismissal element comes from the employer’s failure to address the harassment. The discrimination element adds an injury-to-feelings award on top of any unfair dismissal compensation.

Evidence needed: as for bullying, plus any indication that the conduct related to the protected characteristic (slurs, exclusion patterns, differential treatment).

4. Contract changes

A unilateral change to a fundamental contractual term such as duties, working hours, location or status can be a fundamental breach. The question is whether the term being varied is fundamental to the contract, whether the variation is significant, and whether the employer has contractual cover (a flexibility clause or a mobility clause).

A two-hour change to your start time, or a move to an office five minutes away, is unlikely to qualify. A permanent reassignment from a senior client-facing role to back-office processing, or a move from your home office to a site 60 miles away with no mobility clause, very likely will.

Evidence needed: the original contract clause being changed, the change notification, evidence of the practical impact (commute, childcare, status, remuneration) and your written objection.

5. Unsafe workplaces

The employer’s duty to provide a safe place of work is implied into every UK employment contract, and is backed by the Health and Safety at Work etc Act 1974. A serious or sustained failure to address an identified risk, after the employee has raised the issue, can be a fundamental breach.

The bar is high. A tribunal expects you to have used the internal health and safety route first, and to have given the employer a reasonable chance to act. Simply finding the workplace unpleasant is not enough; there must be a real, evidenced risk to safety. Reportable incidents under RIDDOR strengthen the claim.

Evidence needed: the relevant risk assessment, the incidents that put the risk on the employer’s radar, written reports, and any HSE involvement.

6. Discrimination

Less favourable treatment because of a protected characteristic that the employer refuses to address breaches both the Equality Act 2010 (the discrimination claim) and the implied term of mutual trust and confidence (the constructive dismissal claim). Promotion patterns, pay gaps, allocation of work and performance-review treatment can all support a claim.

Discrimination is harder to evidence than bullying or harassment because the comparator analysis is statistical and the employer almost always offers a non-discriminatory reason. Tribunals look for patterns, not single incidents, and for evidence that the protected characteristic was a material factor in the treatment.

Evidence needed: comparator information (anonymised colleague data on pay, promotion, allocation), formal complaint emails, the employer’s response and the dates that establish a timeline.

7. Demotion

Demotion to a materially lower role without your consent and without performance justification is a fundamental breach. Tribunals look at whether the new role is objectively lower in status (job title, reporting line, team size, responsibilities), whether pay or benefits have reduced, and whether the employer relied on a contractual flexibility clause.

Demotion as the outcome of a fair disciplinary or performance process, supported by contractual cover, is much harder to challenge. Demotion imposed out of the blue, especially after a refusal to take on a different role, almost always meets the threshold.

Evidence needed: the job description of the previous and new roles, the announcement letter, any reduction in pay or benefits, and your written objection.

8. Failure to pay wages

Failing to pay wages on time, or not at all, is one of the most clear-cut fundamental breaches. Section 13 of the Employment Rights Act 1996 makes unauthorised deductions from wages unlawful. A persistent failure to pay, or a single failure to pay a significant amount such as a contractual bonus, is enough to ground a constructive dismissal claim.

The claim can run alongside an unlawful deduction of wages claim, which has its own three-month time limit running from each deduction. If the employer has gone into administration, the position is different and you may need to claim from the Insolvency Service rather than via tribunal.

Evidence needed: pay slips, the contract clause setting the wage, the bank statement showing non-payment, and any correspondence with the employer about the missed payment.

What does not count

The reverse side is just as useful. Tribunals routinely dismiss claims where the underlying breach is too minor. Examples that have failed include a one-off rude email from a colleague, a 5% pay cut imposed across the company after consultation, a temporary change to working hours to cover a colleague’s absence, a single missed bonus where the bonus is discretionary under the contract, and a manager-style dispute that did not escalate to a formal grievance.

If your case looks like one of the “does not count” patterns, focus on the formal grievance first. A genuine breach will usually become clearer over time, and the documentary trail will build the case.

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Frequently asked questions

Does a one-off incident count as constructive dismissal?
Sometimes. A single act can be a fundamental breach if it is serious enough — for example, a unilateral 30% pay cut, a public humiliation by a senior manager, or a refusal to pay holiday pay on termination. More commonly, constructive dismissal builds from a pattern, often called the last straw doctrine: a series of smaller incidents that together breach the implied term of mutual trust and confidence.
What evidence do I need for each example?
Contemporaneous documentation. For a pay cut, the original contract, the change letter and pay slips. For bullying, dated complaint emails, witness names and the employer's response. For unsafe workplaces, photographs, RIDDOR-reportable incidents and the relevant risk assessment. The pattern is the same across all categories: written evidence beats spoken testimony every time.
Can a small pay cut be constructive dismissal?
A pay cut of around 10% or more, imposed without consultation and without contractual basis, has been found to be a fundamental breach in several reported cases. Smaller cuts, or cuts following genuine consultation, are usually not enough. The judgement is always fact-sensitive: how big the cut is, whether it was negotiated, whether it was reversible, and whether the rest of the employer's behaviour adds to the picture.
What if my employer has not yet done anything, but I expect them to?
Anticipatory breach can sometimes support a claim if the employer has made a clear, unequivocal statement of intent to breach a fundamental term (for example, an announcement that pay will be cut next month). In most situations the safer course is to wait for the actual breach, raise a formal grievance and only resign if the breach materialises.

General information, not legal advice. Constructive dismissal claims turn on the specific facts. For your own situation, contact ACAS or an employment-law solicitor before you resign.