Constructive Dismissal vs Unfair Dismissal: What’s the Difference?
Qualifying service periods referenced on this page are correct as of the publication date and are subject to change under the Employment Rights Act 2025 — always check GOV.UK for the current position before relying on a specific figure.
Introduction
Many employees assume that constructive dismissal and unfair dismissal are the same thing. Although the two claims are closely related, they arise in different circumstances and carry different legal requirements.
Understanding the distinction matters because it affects the type of claim you may be able to bring, the evidence you will need to gather, and the legal test an Employment Tribunal will apply to your case.
In simple terms, unfair dismissal usually occurs when your employer dismisses you without a fair reason or without following a fair procedure. Constructive dismissal, by contrast, arises when you resign because your employer’s conduct has fundamentally breached your employment contract, leaving you with little or no reasonable alternative but to leave.
This guide explains how each claim works, how tribunals assess them, and the factors you should weigh up before taking legal action.
If you are unfamiliar with unfair dismissal generally, our Complete Guide to Unfair Dismissal in the UK explains your legal rights, eligibility, and the circumstances in which a dismissal may be unlawful.
Table of Contents
- What Is the Difference Between Constructive Dismissal and Unfair Dismissal?
- What Is Unfair Dismissal?
- What Is Constructive Dismissal?
- Key Differences at a Glance
- Which Claim Applies to Your Situation?
- Can You Claim Both Constructive and Unfair Dismissal?
- Contact Us for Expert Employment Law Advice
- Final Thoughts
- Frequently Asked Questions
What Is the Difference Between Constructive Dismissal and Unfair Dismissal?
The primary difference lies in who brings the employment relationship to an end.
With an unfair dismissal claim, it is the employer who dismisses the employee. With constructive dismissal, it is the employee who resigns because of the employer’s conduct — but the law still treats this as a dismissal, provided the resignation meets the legal test explained below.
Although the outcome looks different on paper, both claims often turn on the same underlying question: did the employer act unfairly, or breach an important legal obligation? Constructive dismissal is best understood as a specific route into an unfair dismissal claim — one that requires an additional element to be proven before the fairness of the “dismissal” is even considered.
What Is Unfair Dismissal?
An employee may have an unfair dismissal claim if they are dismissed without a fair reason, or if their employer fails to follow a fair process in reaching that decision.
Employment law recognises five potentially fair reasons for dismissal: capability, conduct, redundancy, a statutory restriction (for example, losing a legal qualification needed for the role), or “some other substantial reason.” A dismissal for one of these reasons is not automatically fair, however — the employer still has to show that the decision was reasonable in the circumstances and that a fair procedure was followed. This is where many unfair dismissal claims succeed: not because the employer lacked any reason at all, but because the process was flawed. Common examples include dismissing someone without a proper investigation, skipping steps in the disciplinary procedure, relying on insufficient evidence, or acting on a reason that no reasonable employer would have treated as sufficient.
Eligibility also matters. In most cases, employees currently need two years’ continuous service before bringing an ordinary unfair dismissal claim, though there are important exceptions — for example, where the dismissal relates to a protected characteristic or whistleblowing, no minimum service is required. It’s also worth knowing that this qualifying period is due to change: under the Employment Rights Act 2025, the two-year requirement is set to reduce to six months from 1 January 2027. If you’re currently just short of two years’ service, it’s worth getting advice on how the transition affects your position.
If you are unsure whether you qualify, our guide on Unfair Dismissal Under 2 Years: Rules, Exceptions, and the Employment Rights Bill explains the qualifying service requirements and the circumstances where employees may still bring a claim.
What Is Constructive Dismissal?
Constructive dismissal occurs when an employee resigns because their employer has committed a serious breach of the employment contract. Rather than being dismissed outright, the employee decides to leave because the employer’s conduct has made continued employment intolerable.
The legal test, established in the well-known case of Western Excavating (ECC) Ltd v Sharp, requires the employee to show that the employer’s conduct amounted to a fundamental breach — not just unreasonable behaviour, but a breach that goes to the root of the contract. This can be a breach of an express term (such as an unagreed pay cut) or of an implied term, most commonly the implied term of mutual trust and confidence recognised in cases like Malik v Bank of Credit and Commerce International SA. That implied term is breached where an employer, without reasonable and proper cause, behaves in a way calculated or likely to destroy the trust and confidence needed to sustain the employment relationship.
In practice, this can arise from serious bullying or harassment, a significant unilateral pay reduction, major changes to working hours imposed without agreement, unsafe working conditions, persistent discrimination, or a pattern of conduct that cumulatively undermines trust even where no single incident looks decisive on its own — sometimes called the “last straw” doctrine.
Beyond identifying the breach, the employee must also show that the breach caused their resignation, and that they resigned without unreasonable delay. This last point trips up more claims than people expect: if an employee continues working for an extended period after the breach without objection, a tribunal may find they “affirmed” the contract and accepted the breach, which can be fatal to a constructive dismissal claim. Simply being unhappy at work, or disagreeing with a management decision that was within the employer’s rights to make, will not usually be enough — each case turns closely on its own facts.
Key Differences at a Glance
| Constructive Dismissal | Unfair Dismissal |
|---|---|
| Employee resigns | Employer dismisses employee |
| Based on a fundamental breach of contract | Based on an unfair dismissal decision or procedure |
| Employee must prove the employer's conduct justified resignation | Employer must justify the dismissal |
| Often involves breach of the implied term of trust and confidence | Often focuses on the fairness of the dismissal process |
| Requires evidence of the breach, causation, and timely resignation | Requires evidence relating to the reason and process of dismissal |
| Avoids lengthy legal proceedings | Requires mandatory ACAS Early Conciliation before filing |
Although the legal tests differ, both claims rely heavily on evidence. Emails, grievance records, witness statements, meeting notes, and correspondence documenting the employer’s conduct can all play a decisive role in establishing what actually happened.
Which Claim Applies to Your Situation?
Determining the right type of claim depends largely on how your employment ended, and what your employer did (or failed to do) beforehand.
An unfair dismissal claim is likely to be the relevant route if your employer dismissed you outright — for instance, if you believe the decision itself was unreasonable, proper procedures weren’t followed, or the stated reason for dismissal doesn’t stand up to scrutiny.
Constructive dismissal, on the other hand, becomes relevant where you resigned rather than being dismissed, but only because your employer’s conduct left you with no realistic alternative. The key question a tribunal will ask is whether that conduct amounted to a fundamental breach of contract, not simply whether you had good reason to be unhappy.
Because the legal tests differ so much in what they require you to prove, getting professional legal advice before resigning — or before formally bringing a claim — is often the single most useful step you can take. Resigning without understanding your legal position can significantly affect your ability to pursue a constructive dismissal claim successfully, particularly around the risk of being found to have delayed or affirmed the contract.
Can You Claim Both Constructive and Unfair Dismissal?
In some circumstances, yes. Constructive dismissal claims are frequently pursued as unfair dismissal claims, because the employee is arguing that the employer’s serious contractual breach effectively forced their resignation — and once a resignation is treated as a dismissal in law, its fairness still needs to be assessed under the same framework used for ordinary dismissals.
Whether both routes are genuinely open to you will depend on the facts of your case, your employment status, your length of service, and the specific legal issues involved. If proceedings become necessary, understanding how to make an unfair dismissal claim and preparing the right evidence early can significantly strengthen your position before an Employment Tribunal.
Contact Us for Expert Employment Law Advice
Determining whether your situation amounts to constructive dismissal or unfair dismissal is not always straightforward — small factual differences can have a significant impact on your legal rights and the strength of your claim.
Our experienced employment law team can assess whether you have a potential claim, explain how the two routes differ in your specific circumstances, review your employer’s conduct against the legal tests above, and advise you on your options — including representation during negotiations or at tribunal.
Final Thoughts
Although constructive dismissal and unfair dismissal are closely connected, they are not interchangeable. The key distinction is whether the employment relationship ended because the employer dismissed the employee, or because the employee resigned in response to a fundamental breach of contract.
Understanding which claim may apply is essential before taking any legal action. Acting too quickly, or resigning without proper advice, could affect your legal position and the remedies available to you.
For official guidance alongside this article, the ACAS website provides information on dismissal and grievance procedures, while GOV.UK offers guidance on employment rights and bringing an Employment Tribunal claim.