This guide is maintained as a current resource for July 2026 and covers only the laws of England and Wales. Information is for general guidance, not legal advice. Consult a qualified solicitor for advice specific to your situation.
A detailed guide explaining whether employees can claim unfair dismissal after contract changes in England and Wales. Covers ordinary unfair dismissal, constructive dismissal, working under protest, qualifying periods, tribunal processes, and practical steps to protect rights.
When an employer makes changes to an employee's contract of employment, questions can arise about whether those changes are lawful and whether employees can claim unfair dismissal if their job ends or they are treated detrimentally because they refuse to accept new terms. Contract variations sit at the intersection of contract law and employment rights. This article explains when enforced or disputed contract changes can lead to unfair dismissal claims, the difference between constructive dismissal and ordinary unfair dismissal, qualifying criteria, key legal principles, time limits, and practical steps.
Contract Changes and Employment Rights
A contract of employment sets out the terms on which an employee works. Employers and employees can agree changes to those terms. However, where changes are introduced without proper agreement, there may be legal consequences. In some cases, contract changes lead to disputes that culminate in dismissal or resignation. Workers must understand how the law treats these situations and whether a claim for unfair dismissal is possible.
How Contract Changes Are Lawfully Made
Agreement and Variation Clauses
Employers must generally obtain an employee's consent before varying terms and conditions of employment. A variation clause in the contract may allow some changes without fresh agreement, but such clauses are interpreted strictly by tribunals. Employers also often communicate changes in writing, giving notice where required.
If an employer imposes a change without consent, it can amount to a breach of contract. In such cases, employees may be able to:
- refuse to work under the new terms;
- register objection and work under protest;
- resign and claim constructive dismissal;
- bring claims for breach of contract, unlawful deduction from wages, or discrimination if applicable.
Ordinary Unfair Dismissal after Contract Change
When Contract Changes Lead to Dismissal
If an employer dismisses an employee because they have refused to accept a contract change, the dismissal itself may be challenged as unfair. To succeed in an employment tribunal, the employee generally must show:
- They were dismissed (expressly or effectively).
- They had the qualifying period for unfair dismissal (currently two years' continuous service, reducing to six months under forthcoming law reforms from 1 January 2027) when the dismissal occurred.
- The reason for dismissal was not one of the potentially fair statutory reasons (conduct, capability, redundancy, statutory restriction, or “some other substantial reason”, often used in contract change cases).
- The employer failed to act reasonably in treating the refusal to accept the change as grounds for dismissal and failed to follow a fair procedure.
In practice, when an employer terminates a contract to impose new terms, this counts as a dismissal, even if the employee is offered re‑engagement. Tribunals will examine whether the employer had a valid and fair reason and followed proper procedures.
“Some Other Substantial Reason” (SOSR)
Employers often rely on some other substantial reason (SOSR) under section 98 of the Employment Rights Act 1996 as the fair reason to dismiss an employee who refuses changes. This is a broad category that includes contract variation where there is a genuine business requirement. However, employers still must act reasonably - including consulting employees and exploring alternatives - otherwise the tribunal may find the dismissal unfair.
Constructive Dismissal and Contract Changes
What Constructive Dismissal Is
Constructive dismissal arises when an employee resigns because their employer has fundamentally breached the employment contract. Unilateral, substantial changes to key terms may qualify if they go to the root of the contract. Constructive dismissal claims are usually brought as claims of constructive unfair dismissal.
Examples of fundamental changes include significant cuts to pay, major changes to hours or working patterns, or other detrimental terms that are imposed without agreement and which the employee cannot reasonably accept.
Key Requirements for Constructive Unfair Dismissal
To bring a constructive unfair dismissal claim based on contract variations:
- The employee must have at least the qualifying service (currently two years, though reforms may change this to six months by 2027).
- The employer's breach must be fundamental - going beyond minor contractual adjustments.
- The employee must resign promptly in response to the breach and treat the contract as terminated.
Tribunals apply a strict test to constructive dismissal claims, and they can be difficult to win because the employee effectively ends the relationship.
Working Under Protest and Other Claims
Working Under Protest
Employees who disagree with contractual changes but do not resign may choose to work under protest. They continue performing duties under new terms while clearly indicating they do not accept the change. This preserves the option to bring legal action without losing employment.
Such protest can support claims for breach of contract, or - in some rare and complex cases - an unfair dismissal claim while remaining employed, where the change effectively alters core terms.
Other Potential Claims
If contract changes result in lower pay or unlawful deductions, employees may bring claims for unlawful deduction from wages. If changes are discriminatory (treating employees with protected characteristics less favourably), employees may bring claims under the Equality Act 2010.
Time Limits and Tribunal Process
Employees claiming unfair dismissal must generally notify Acas for early conciliation and then present their claim to an employment tribunal within three months less one day from the effective date of termination. Constructive dismissal claims also fall under this time limit, calculated from the date of resignation. Failure to comply can jeopardise the claim unless exceptional circumstances apply.
Practical Examples
Example 1: Pay cut imposed without agreement
An employer reduces pay by 20% without consent. The employee refuses and is dismissed. If the employer cannot justify the changes and did not act reasonably, the employee may have a valid unfair dismissal claim. Continuation under protest may preserve additional claims.
Example 2: Major rota change
An employee's core hours are fundamentally altered without agreement. The employee resigns and claims constructive dismissal - arguing this amounts to a fundamental breach. Success depends on the severity of the change and the employee's service.
Example 3: Fire and rehire
An employer dismisses and offers re‑engagement on worse terms, without a fair process or valid reason. This dismissal can be challenged as unfair dismissal where the employer's conduct fails the reasonableness test.
Common Questions
Can I accept a new contract and still claim unfair dismissal?
Yes. Accepting a new contract does not necessarily bar a claim if the dismissal of the old contract was unfair and you can demonstrate that it was dismissed for an unfair reason or without fair procedure.
What if the change is minor?
Minor changes (e.g., slight adjustments to notice periods or job title) without adverse effect may not give rise to unfair dismissal or constructive dismissal claims. Such claims usually arise from substantial contractual changes imposed without agreement.
Do I lose rights if I continue working?
If you continue working without protesting, you may be deemed to have accepted the new terms, which can limit your options for tribunal claims. Registering objection in writing helps to preserve your position.
Key Takeaways
Employees can claim unfair dismissal after contract changes if they are dismissed for refusing to accept imposed changes or if the employer's conduct amounts to a dismissal in substance. Employers must obtain agreement to changes, implement them reasonably, and follow fair procedures if dismissal results from a refusal. Ordinary unfair dismissal claims require qualifying service (currently two years, moving to six months under upcoming reforms). Constructive dismissal may also arise where changes fundamentally breach the contract. Working under protest and exploring alternative claims - such as unlawful deduction from wages or discrimination - are additional routes where applicable. Understanding the legal framework and time limits is key to protecting employment rights in cases of disputed contract changes.
