Can My Employer Change My Contract? Your Rights Explained
Can My Employer Change My Contract? Your Rights Explained
This article applies to England, Wales and Scotland.
In brief: Your employer cannot change your employment contract without your agreement. Changes require either your consent, a variation clause in your contract, or a change in law. If they impose changes without agreement, this may be a breach of contract — and depending on severity, could support a constructive dismissal claim.
Last updated: March 2026
When your employer tells you that your pay is being cut, your hours are changing, or you are being moved to a different site, it can feel like there is nothing you can do. The reality is quite different. Your employment contract is a legally binding agreement, and your employer cannot simply rewrite it whenever it suits them.
This guide explains when contract changes are lawful, when they are not, and — critically — what you can do about it before you lose your right to object.
When Can an Employer Lawfully Change Your Contract?
There are three situations where a contract change is legally valid.
1. You agree to the change
Mutual agreement is the clearest route. Your employer proposes a change, you discuss it, and you agree — ideally in writing. This is a clean variation of contract. If you sign an amended contract or simply confirm your agreement in writing, that change becomes binding.
2. Your contract contains a variation or flexibility clause
Some contracts include clauses that give the employer limited rights to alter certain terms — for example, changing your place of work within a defined radius, or adjusting shift patterns to meet business needs. These are called variation clauses or flexibility clauses.
However, these clauses are not a blank cheque. They only permit changes that fall within their specific scope, and even then, the change must be reasonable. A vague clause stating the employer "reserves the right to change terms from time to time" cannot be used to bring in fundamental changes to pay or hours. Courts have consistently held that such clauses are subject to an implied duty of mutual trust and confidence — your employer cannot exercise them in a way that is wholly unreasonable (Malik v BCCI [1998] AC 20).
3. A change in law requires it
If new legislation means your existing terms are no longer lawful, your employer can update your contract accordingly. This is relatively rare in practice.
When Is a Contract Change Unlawful?
If none of the three situations above apply, your employer does not have the right to change your contract. Doing so anyway is a breach of contract.
Common examples of unlawful imposed changes include:
- Cutting your basic salary without your agreement
- Reducing your contractual holiday entitlement beyond statutory minimum
- Demoting you to a lower role or grade
- Changing your working hours substantially (for example, from days to nights)
- Removing contractual benefits such as a car, private healthcare, or enhanced pension contributions
- Relocating your workplace beyond any mobility clause in your contract
The critical point is this: your employer giving you notice of an intended change does not make that change lawful. Notice is procedural, not legal authorisation. If the underlying change is not permitted, it remains a breach of contract regardless of how much warning you received.
The Affirmation Trap: Why Silence Is Dangerous
This is the part most people do not realise until it is too late.
If your employer imposes a change without your agreement and you carry on working without raising any objection, you risk being treated as having accepted the new terms — even if you privately disagree with them.
This is known as affirmation. Once you have affirmed a change by working under it without protest for a significant period, you lose your right to challenge it.
The moment you become aware of an imposed change you do not accept, you need to act. Write to your employer — email is fine — and make clear that you are working under the changed terms only under protest, pending resolution. Keep a copy.
This does not mean you have to escalate immediately. It means you preserve your legal position while attempting to resolve things internally.
Fire and Rehire: The Nuclear Option
When employees refuse to accept a contract change, some employers resort to what is commonly known as "fire and rehire." This is where an employer formally terminates your existing contract (giving proper notice) and offers you re-engagement on new, usually worse, terms.
Strictly speaking, this avoids a breach of contract claim because the employer is lawfully ending the original contract rather than unilaterally rewriting it. Your remedy in that situation — if you have qualifying service — would be an unfair dismissal claim rather than a breach of contract claim.
Under the Employment Rights Act 2025, the rules here are changing. Fire and rehire practices are being significantly restricted. Employers will need to meet a higher threshold before dismissing and re-engaging staff, and the ACAS Code of Practice on dismissal and re-engagement already creates a framework that tribunals take into account when assessing whether any resulting dismissal was fair. Failure to follow the Code can result in a compensation uplift of up to 25%.
ERA 2025 measures to restrict fire and rehire are expected to come into force in January 2027 — pushed back from an earlier planned date of October 2026. The ACAS Code of Practice already applies, and tribunals scrutinise the process closely. If your employer is threatening this route, getting clear on your rights before responding to any new terms is worth doing.
Your Six Options When a Contract Change Is Imposed
If your employer imposes a change you have not agreed to, you have real choices. Here is a clear breakdown.
1. Accept the change
You can simply agree. This makes sense if the change is minor, if there are business reasons you understand and accept, or if you want to preserve the employment relationship. Get any new terms confirmed in writing.
2. Negotiate
You may be able to negotiate — perhaps accepting a smaller change, or agreeing to a change in exchange for other concessions such as a pay review date or additional holiday. Employers who genuinely want your cooperation will often engage in this process.
3. Work under protest
As outlined above, this preserves your legal position while you explore resolution internally. Write to confirm you are working under protest. Raise a formal grievance if necessary.
4. Raise a formal grievance
Filing a grievance creates a formal record and triggers your employer's obligation to investigate and respond. If your employer dismisses the grievance without a proper process, that itself may be relevant to any later tribunal claim.
5. Bring an employment tribunal claim while continuing to work
In limited circumstances, you may be able to bring a claim — for example, for unlawful deduction from wages if your pay has been cut — without resigning. This is a complex area, and seeking guidance before proceeding is advisable.
6. Resign and claim constructive dismissal
If the change is a fundamental breach of your contract, and your employer refuses to remedy it, you may be entitled to resign and bring a claim for constructive dismissal. This is not a step to take lightly. Constructive dismissal claims are difficult to win, and resigning eliminates your income while the claim is pending. The time limit to bring a constructive dismissal claim is three months minus one day from the date your employment ends — and this is expected to increase to six months under the Employment Rights Act 2025 from no earlier than October 2026.
Before resigning for constructive dismissal, always seek guidance on whether the breach is sufficiently serious to support the claim.
What Counts as a Fundamental Breach?
Not every contract change entitles you to resign and claim constructive dismissal. The breach must be serious — going to the root of the contract, or breaching the implied term of mutual trust and confidence.
Courts and tribunals have found fundamental breaches in situations including:
- A significant, unexplained pay cut
- A demotion that substantially changes your role and status
- Systematic removal of benefits that formed a core part of your package
- Forced relocation far beyond any mobility clause
- Changes that amount to harassment or create an untenable working environment
Minor administrative changes — updating your job title without changing your duties, or adjusting notice periods for expenses claims — are unlikely to reach this threshold.
The Time Limit for Taking Action
The route and time limit for any claim depends on whether you are still employed or your employment has ended.
If your employment has ended: You may be able to bring a breach of contract claim in the employment tribunal under the Employment Tribunals Extension of Jurisdiction Order 1994. The three-month time limit runs from your effective date of termination — not from when the breach originally occurred. Tribunal breach of contract awards are capped at £25,000; if your loss exceeds that, a civil court claim may be needed.
If you are still employed: The employment tribunal has no jurisdiction to hear a pure breach of contract claim while you remain in employment. Mid-employment remedies are either a civil court claim (where a six-year limitation period applies) or, where the breach involves unlawful deductions from your pay, a tribunal claim under Part II of the Employment Rights Act 1996.
For unlawful deduction from wages claims — the most common mid-employment route — the time limit is three months minus one day from the date of each deduction. A series of deductions linked together may extend the window, but do not assume you have unlimited time. Once you leave employment, the employment tribunal can also consider any breach of contract claims outstanding at that point, subject to the three-month termination deadline.
If your employer is cutting your pay unlawfully and you are still employed, an unlawful deduction claim is usually the faster and more accessible route.
What About TUPE Transfers?
If your employment transfers to a new employer under TUPE (Transfer of Undertakings Protection of Employment), your existing contract terms transfer with you. Your new employer cannot change those terms simply because the transfer happened, or because their existing staff are on different terms.
Changes to terms following a TUPE transfer that are connected to the transfer itself are generally unlawful — even if the employee agrees to them, in some circumstances.
If you have recently been through a business transfer and your new employer is proposing contract changes, this is an area where specific guidance is worth obtaining, as the rules are complex.
Collective Changes: Fire and Rehire Affecting 20 or More Employees
If your employer is proposing to use fire and rehire — dismissing and re-engaging staff on new terms — and this affects 20 or more employees at one establishment within a 90-day period, the collective consultation obligations under section 188 of the Trade Union and Labour Relations (Consolidation) Act 1992 apply.
This is an important distinction. Section 188 is triggered by proposed dismissals, not by contract changes alone. If your employer is imposing changes without dismissal, s.188 does not apply — though other rights still do. But where the employer is planning to dismiss and re-engage 20 or more employees, they are required to consult collectively — with a recognised trade union, or with elected employee representatives — before any dismissals take effect. The minimum consultation period is 30 days (or 45 days where 100 or more are affected).
Where this obligation is not followed, employees may be entitled to a protective award of up to 90 days' pay per affected employee. This is a separate and significant right, entirely distinct from any unfair dismissal claim.
FAQ
My employer says the change is in the business's interests. Does that mean I have to accept it? No. A business reason for wanting to make a change does not give your employer the legal right to impose it. They still need your agreement, or authority under a variation clause, to do so lawfully. However, a genuine business reason is relevant if the matter ever reaches a tribunal — a fair dismissal on grounds of "some other substantial reason" may be found where the employer had sound commercial justification and followed a fair process.
I signed a new contract under pressure. Can I undo it? Signing under duress is a complex area. If you were threatened with dismissal unless you signed, that may be relevant — but the courts set a high bar for economic duress in employment contexts. Getting advice on the specific facts is worth doing before assuming any agreement you signed is automatically void.
My pay has already been cut. Can I claim it back? If the pay cut was not authorised by your contract and you did not agree to it, you may have a claim for unlawful deduction from wages under Part II of the Employment Rights Act 1996 (see our guide to breach of employment contract). This claim can be brought in the employment tribunal and, importantly, can be brought while you remain employed — you do not need to resign to pursue it.
What if there is a variation clause in my contract — does that mean my employer can change anything? No. Variation clauses are limited in scope. They must clearly cover the type of change being made, and any change exercised under them must be reasonable. Courts will not permit an employer to use a broadly-worded clause to fundamentally alter the terms of employment.
My employer is threatening fire and rehire. What should I do? Do not ignore this. Get clear on what the new terms would be, whether the existing process complies with the ACAS Code of Practice, and whether you would have a claim if dismissed. Accepting re-engagement on worse terms does not necessarily prevent you from making an unfair dismissal claim for the original termination in some circumstances.
How do I know if my change qualifies for constructive dismissal? The change must be a fundamental breach of your contract — not just an inconvenience or something you dislike. The key question is whether the employer's conduct amounted to a repudiation of the contract — a clear signal that they no longer intend to be bound by its essential terms. Also check that you have not affirmed the breach by working under it without protest.
Sources
- Employment Rights Act 1996, Parts II and X — legislation.gov.uk/ukpga/1996/18
- Employment Rights Act 2025 — legislation.gov.uk
- Trade Union and Labour Relations (Consolidation) Act 1992, s.188 — collective consultation obligations
- ACAS: Changing an employment contract — acas.org.uk/changing-an-employment-contract
- ACAS Code of Practice on Dismissal and Re-engagement (2025) — acas.org.uk
- Malik v Bank of Credit and Commerce International SA [1998] AC 20 — implied term of mutual trust and confidence
- Citizens Advice: Check if your employer can make changes to your contract — citizensadvice.org.uk
Important notice: This article is published by Yerty for general informational purposes only and does not constitute legal advice. It should not be relied upon as a substitute for professional legal advice tailored to your specific circumstances. Yerty is not a law firm and does not provide legal advice.
Employment law is highly fact-sensitive. The applicability of any legal principle, time limit, or remedy will depend on the particular facts of your situation, your contract terms, and the conduct of the parties involved.
If you are facing a contract dispute, we strongly encourage you to seek independent legal advice before taking any action — particularly before resigning, signing amended terms, or commencing legal proceedings. Use Yerty's free assessment as a first step to understanding your situation, then speak to a qualified employment solicitor before making any significant decisions.