UK Constructive Dismissal (2026/27): What Counts, What Doesn't, and How to Build the Case

Constructive dismissal 2026/27 (Great Britain): the Western Excavating test, fundamental breach, last straw, affirmation, time limits and the January 2027 changes.

2026/27 tax year

Employment & Career
Employee
England
Scotland
Wales

The four-stage test

Section 95(1)(c) of the Employment Rights Act 1996 treats a resignation as a dismissal where the employer's conduct entitled the employee to resign without notice. Since Western Excavating (ECC) Ltd v Sharp [1978] (Court of Appeal) that is a contract test, usually broken into four questions:

A breach by the employer - of an express term, or an implied one such as mutual trust and confidence. A single act (pay cut, demotion) or a course of conduct ending in a "last straw".
Serious enough to be fundamental - it must go to the root of the contract. Unreasonable treatment that is not a breach of contract does not qualify.
You resigned in response to the breach - it must be a reason for your resignation, not merely something happening at the same time. Stating it in the resignation letter helps.
You did not affirm the contract first - continuing to work for a long period without protest can be treated as accepting the breach, which ends the claim.

Raising a grievance first is not part of the legal test, but an unreasonable failure to follow the ACAS Code of Practice on Disciplinary and Grievance Procedures lets the tribunal increase (employer's failure) or reduce (employee's failure) the award by up to 25% (section 207A TULRCA 1992).

Common fundamental breaches

Express term breaches

Material unilateral pay cut
Demotion without contractual right
Imposed location change against terms
Removal of contractual benefits
Refusal to pay agreed bonus
Imposed working pattern outside terms

Implied term breaches

Sustained harassment / bullying
Failure to investigate grievances
Public humiliation
Unreasonable workload causing harm
Failure to address health + safety
Breach of trust + confidence

Evidence checklist - build before resigning

Contract + handbook - the term being breached, ideally with a copy of the staff handbook reference.
The breach itself - emails, written instructions, witnessed conversations (write them up immediately + email yourself).
Pattern evidence - if "last straw" cumulative, show the timeline of incidents.
Grievance raised in writing - your grievance letter + employer's response (or non-response).
Health impact - GP notes, occupational health reports, fit notes, prescription history if stress/anxiety.
Witness statements - colleagues willing to speak to incidents (often reluctant - approach carefully).
Financial impact - payslips, evidence of reduced bonus, projected loss.
Resignation letter - explicit reference to constructive dismissal + specific reasons.

Recording workplace conversations is legally complex - covert recordings can be admitted in tribunal but may damage employer trust + raise data protection issues. Take legal advice before recording.

Decision framework before resigning

Have you raised a formal grievance? If not, do that first. Many cases settle at grievance stage.
Have you got the qualifying service? Two years where your employment ends before 1 January 2027, six months where it ends on or after. Under it, an ordinary unfair dismissal claim is unavailable unless discrimination or automatic unfair grounds apply. Wrongful dismissal (notice pay only) still available. Section 25 of the Employment Rights Act 2025 cuts the section 108 qualifying period from two years to six months, but only from 1 January 2027 (SI 2026/559 reg 3) and only where the effective date of termination falls on or after that date (reg 4). It is not a day-one right, and there is no statutory probation period.
Can you negotiate a settlement instead? Settlement agreement with mutual end of employment + financial package often beats litigation. A settlement agreement is only binding if you have received advice from an independent adviser on its terms; employers often contribute to the cost.
Do you have a new job lined up? Mitigation duty + tribunals view "principled resignation with no plan" sceptically unless the breach is genuinely severe.
Are you well enough to litigate? Tribunal claims can take many months to reach a hearing and are emotionally and financially demanding.
What outcome do you want? Reinstatement / compensation / reference / public vindication / closure? Each suggests a different strategy.

UK Employment Contract Red Flags 2026/27 - clauses that make breach harder to claim.
UK Notice Period Rules 2026/27 - notice + wrongful dismissal.
UK Statutory Redundancy Pay 2026/27 - settlement structure + £30k tax-free.
UK Probation Period Rights 2026/27 - service requirement for unfair dismissal.
UK Collective Redundancy Consultation 2026/27 - alternative exit framework.

Frequently asked questions

What is constructive dismissal?

A resignation that the law treats as a dismissal because the employer's conduct fundamentally breached the employment contract, leaving the employee with no real choice but to leave. Section 95(1)(c) Employment Rights Act 1996. The contract test comes from the Court of Appeal in Western Excavating (ECC) Ltd v Sharp [1978]: (1) the employer breached a term of the contract, (2) the breach was serious enough to go to the root of the contract, (3) the employee resigned in response to it, and (4) did not affirm the contract first by delay or conduct. A constructive dismissal is not automatically unfair; you then bring an unfair dismissal claim (which needs qualifying service, see below) and can also claim wrongful dismissal for notice pay (no service requirement).

What counts as a "fundamental breach"?

Conduct serious enough to go to the root of the contract. Examples: (a) Material unilateral pay cut without consent. (b) Demotion without contractual right + without redundancy. (c) Persistent bullying / harassment unaddressed by employer. (d) Failure to investigate grievances. (e) Sustained unreasonable workload causing health detriment. (f) Forced relocation without contractual basis. (g) Public humiliation of the employee. (h) Repeated breach of implied terms (mutual trust + confidence, duty of care, fair treatment). Single trivial breaches don't qualify. Cumulative conduct can ("last straw" doctrine - Omilaju v Waltham Forest LBC [2004] EWCA Civ 1493).

What is the "last straw" doctrine?

A series of minor incidents that don't individually amount to fundamental breach can cumulatively do so when a final incident "the last straw" tips it over. The last straw does not itself need to be a breach of contract, or even unreasonable, but it must contribute something to the series. The caveat from Omilaju [2004]: an entirely innocuous act by the employer cannot be the last straw, even if the employee genuinely saw it as hurtful. Useful for: drawn-out toxic management, persistent micromanagement after raising grievances, sustained pay disputes.

How long do I have to claim?

The time limit depends on when the thing you are complaining about happened, not on when you file: 3 months less 1 day if it happened before 1 October 2026, and 6 months less 1 day if it happened on or after that date. For a dismissal the date is the effective date of termination; for a series of acts or deductions it is the last one. Starting ACAS Early Conciliation pauses the clock. For a constructive dismissal the clock runs from the effective date of termination, your last working day, and you must start ACAS Early Conciliation before you can file. The days in conciliation do not count, and if your limit would otherwise run out during conciliation or within a month after the certificate, it runs to one month after the certificate instead (section 207B Employment Rights Act 1996). Miss the limit and the unfair dismissal claim is out of time unless the tribunal accepts it was not reasonably practicable to present it in time, which is rarely accepted. Start preparing immediately - don't wait for the time limit to approach.

How do I avoid "affirming" the breach?

Affirmation = behaving as if the breach didn't happen, which loses the right to claim. To avoid affirming: (a) Don't accept the breach by continuing without protest. (b) Raise the breach formally in writing - grievance letter to HR. (c) Set a clear timeline: "If [issue] is not resolved by [date], I reserve the right to resign + claim constructive dismissal." (d) Avoid conduct that implies you have accepted the change, such as signing a new contract on the changed terms. (e) Delay alone does not always affirm, and a short period while a grievance is dealt with is common, but the longer you work on without protest the stronger the employer's affirmation argument. (f) When you decide to leave, state the constructive dismissal reason in writing.

What evidence do I need?

Document everything contemporaneously. (a) The contractual term being breached - the contract / staff handbook. (b) The breach itself - emails, recordings (audio recording in workplace can be legally complex - get advice), witness statements, photographs of conditions. (c) The grievance you raised + employer's response. (d) Health impact if applicable - GP notes, occupational health reports, prescribed medication for stress/anxiety. (e) Financial loss - payslips showing the pay cut, evidence of reduced earnings since leaving. (f) Resignation letter clearly stating constructive dismissal + the reasons. Build the case BEFORE leaving - much harder to gather after.

What can I claim?

Unfair dismissal compensation: (a) Basic award - worked out like statutory redundancy: half a week, one week or one and a half weeks of pay per complete year depending on age, up to 20 years, with a week's pay capped at £751 from 6 April 2026 (sections 119 and 227 Employment Rights Act 1996). (b) Compensatory award - where the effective date of termination is before 1 January 2027, capped at the lower of 52 weeks' pay and a fixed limit, £123,543 where that date is on or after 6 April 2026 (section 124, SI 2026/310). Section 25(3) of the Employment Rights Act 2025 repeals that cap where the effective date of termination is on or after 1 January 2027 (SI 2026/559 reg 4). It covers: lost earnings between dismissal + new job, loss of statutory rights, loss of benefits, future loss if not yet new job, pension loss (significant for long-tenured employees). Plus wrongful dismissal damages = notice period pay. Plus discrimination compensation if applicable (UNCAPPED + can include injury to feelings). Mitigation duty - you must try to find new work; failure reduces compensation.

Can I claim without 2 years service?

Ordinary unfair dismissal needs a qualifying period of continuous service, and which one applies turns on the effective date of termination rather than on when you were told: two years where it falls before 1 January 2027, six months where it falls on or after. That change is not in force yet, so the period is two years today - including for a notice given now that expires before 1 January 2027. That is section 108 of the Employment Rights Act 1996, as amended by section 25 of the Employment Rights Act 2025. Wrongful dismissal (breach of contract = notice period claim) needs NO service requirement. Discrimination claims (Equality Act 2010) - if the constructive dismissal was driven by a protected characteristic - need NO service. Automatic unfair dismissal reasons (whistleblowing, asserting statutory rights, pregnancy, trade union activities) also need NO service. The qualifying period falls to 6 months, not to zero, when section 25 of the Employment Rights Act 2025 starts on 1 January 2027 - and it applies by effective date of termination, so resigning in December 2026 keeps you on the 2-year rule.