Can My Employer Change My Contract? Your Rights When Terms Change
This guide covers England and Wales. It is general information, not legal advice, and is not a substitute for advice about your own situation. Laws and figures change - always check the current position on GOV.UK before relying on any detail here.
If your employer has just changed something fundamental - your pay, your hours, your job itself - without asking you, you are probably angry, and you are right to be. It can feel as though the ground has shifted under you overnight, and that you have no say in it. The first thing to know is that in most cases they were not simply allowed to do it: a contract is an agreement, and agreements usually cannot be rewritten by one side alone. This guide explains where the line is, and what you can do to protect your position before you decide anything.
Finding out your employer has changed your pay, hours, duties or workplace - without asking you - is unsettling, and the first question is almost always the same: are they even allowed to do that? In most cases the answer is no, at least not without your agreement. But there are exceptions, and how you respond in the first few weeks can make a real difference to your legal position. This guide explains when a change is lawful, when it is a breach, and what you can do about it.
Law status - last updated 1 July 2026: The general rule that contract terms cannot be changed without agreement is long-established. The Employment Rights Act 2025 introduces new restrictions on "fire and rehire", which are being brought into force by commencement regulations - check the current position, as some provisions are not yet live.
The starting point: a contract needs agreement to change
Your employment contract is an agreement between you and your employer. Like any contract, its terms cannot normally be changed by one side alone. A change agreed by both of you is called a variation, and it is perfectly lawful. A change imposed by one side without the other's agreement is usually a breach of contract.
Your contract is made up of more than the signed document. It includes:
- the written terms in your contract or statement of particulars
- terms implied by law (such as the duty of mutual trust and confidence)
- terms from custom and practice or an employee handbook, where they are contractual
So when we ask "can my employer change my contract?", we are really asking whether the specific term being changed can be altered without your consent - and the answer depends on the term and how the change is made.
When can an employer change terms lawfully?
There are a few routes by which a change can be lawful:
1. You agree to it. The cleanest route. If your employer proposes a change and you accept it - expressly, or sometimes by clearly working under the new terms without objection - the variation is binding. This is why silence is risky: continuing to work without protest can be treated as acceptance.
2. There is a flexibility clause. Some contracts contain a clause allowing the employer to vary certain terms - duties, hours, or location - within limits. Even then, the clause must be exercised reasonably, and tribunals read wide or vague clauses narrowly. A mobility clause might allow a modest change of location; it usually cannot be stretched to force a move across the country, or to justify a large pay cut.
3. Collective agreement. Where a term is set by a collective agreement with a recognised union, changes may be made through that machinery.
4. Dismissal and re-engagement ("fire and rehire"). As a last resort, an employer may dismiss you and offer to re-employ you on new terms. This is lawful only in limited circumstances and carries real risk - see below.
When a change is a breach
If your employer imposes a significant change to a core term - cutting your pay, materially increasing or reducing your hours, removing your main duties, or moving your workplace - without your agreement and without a valid contractual right, they are usually in breach of contract. Depending on the term, this can give rise to more than one claim:
- Unlawful deduction from wages - if your pay is reduced, the shortfall can be claimed as an unlawful deduction
- Breach of contract - a claim for the loss caused by the breach
- Constructive dismissal - if the breach is fundamental, you may be able to resign and treat yourself as dismissed (see below)
Fire and rehire: not a free pass
"Fire and rehire" (formally, dismissal and re-engagement) is where an employer dismisses employees and offers to take them back on new, usually worse, terms. It is legally risky for the employer, not a simple workaround:
- the dismissal itself can be unfair, exposing the employer to unfair dismissal claims
- a statutory Code of Practice governs how it must be handled, and unreasonable failure to follow it can increase compensation
- the Employment Rights Act 2025 tightens the rules further, restricting when the practice can lawfully be used
If your employer is threatening to dismiss and re-engage you to force through changes, that is a serious step with consequences for them - not a settled right.
What to do if your terms are changed without agreement
How you react early matters, because staying silent can be read as acceptance. Practical steps that protect your position:
- Object in writing, promptly. Make clear you do not agree to the change and are working "under protest". This single step preserves your right to challenge it later.
- Keep working, if you can. Resigning immediately is drastic and risky. Working under protest keeps your income and your options open while you decide.
- Raise a formal grievance. Set out the change, why it breaches your contract, and what you want. The grievance letter guide shows how to frame it.
- Keep records. Save the old contract, the notification of the change, payslips showing any difference, and all correspondence.
- Get the timing right on any claim. Tribunal deadlines are strict, and the clock can start from the change or from your resignation depending on the claim.
When a contract change becomes constructive dismissal
If the change is a fundamental breach - a serious unilateral pay cut is the classic example - you may be entitled to resign and claim constructive dismissal, treating the employer's conduct as ending the contract. But this is a serious, usually irreversible step: you lose your income and take on the burden of proving the breach and that you did not wait too long. Objecting in writing and raising a grievance first both strengthen that route and buy you time to decide. Do not resign in the heat of the moment.
Key takeaway
As a rule, your employer cannot change your contract without your agreement, and a significant imposed change - especially to pay - is usually a breach that can support an unlawful deduction, breach of contract, or constructive dismissal claim. The main exceptions are a genuine (and reasonably used) flexibility clause and the high-risk route of fire and rehire, which the law is tightening. If a change is imposed on you, the most important early move is to object in writing and keep working under protest, rather than either accepting it silently or walking out - both of which can weaken your position.
_This article is legal information, not legal advice. The law on contract variation and fire and rehire is changing under the Employment Rights Act 2025; check the current position via the official sources linked above._
Sources used in this guide
- Employment Rights Act 1996
- Employment Rights Act 2025
- Acas: changing an employment contract
- GOV.UK: Your employment contract and working hours
Links to legislation.gov.uk, gov.uk, acas.org.uk and bills.parliament.uk are official sources. Always check the current version on the source site before relying on a specific point.
Frequently asked questions
Can my employer cut my pay without my agreement?
Not lawfully in most cases. Pay is a core contractual term, and reducing it without your consent is normally a breach of contract and can be an unlawful deduction from wages. If your employer cuts your pay unilaterally, you may be able to claim the shortfall as an unlawful deduction and, if it is serious enough, treat it as a fundamental breach that supports a constructive dismissal claim. Continuing to work while objecting in writing helps protect your position.
What is a flexibility clause?
A flexibility or variation clause is wording in your contract that allows the employer to make certain changes - for example, to your duties, hours or place of work - within limits. Even where one exists, it must be exercised reasonably and cannot usually be stretched to impose a fundamental change like a large pay cut. A vague or very wide flexibility clause is often interpreted narrowly by tribunals.
What is 'fire and rehire'?
Fire and rehire (dismissal and re-engagement) is where an employer dismisses you and offers to re-employ you on new, usually worse, terms. It is lawful only in limited circumstances and carries real risk for the employer: the dismissal can be unfair, and there is a statutory Code of Practice governing it, with further restrictions introduced by the Employment Rights Act 2025. It is not a free pass to rewrite your contract.
What can I do if my employer changes my contract without asking?
You generally have options: object in writing while continuing to work 'under protest', raise a formal grievance, claim any shortfall as an unlawful deduction, or - if the change is a fundamental breach - consider constructive dismissal. The right response depends on how serious the change is and what you want to achieve. Acting quickly and putting your objection in writing matters, because staying silent can be read as acceptance.
Has your employer changed your terms without asking?
Ari helps you work out whether the change is lawful, what your options are, and gets a human quality check before you decide how to respond.
Start your caseRelated guides
Claims11 min readConstructive Dismissal: What Actually Counts (and What Doesn't)
A plain-English guide to constructive dismissal under UK law: the legal test, the behaviour that qualifies, and the resignation timing that trips people up.
Read guide
Claims8 min readUnpaid Wages and Unlawful Deductions: What UK Workers Need to Know
Withheld pay, deductions you never agreed to, or unpaid holiday pay may be a claim under the Employment Rights Act 1996. Your rights, deadlines, and next steps.
Read guide
Documents9 min readHow to Write a Workplace Grievance Letter
A plain English guide to writing a formal grievance letter in the UK - what to include, where to send it, and how it affects your employment tribunal claim.
Read guide
Rights10 min readEmployment Rights Act 2025: What Has Changed and When
A plain-English summary of the Employment Rights Act 2025: what it introduces, when changes come into force, and what it means for an employment dispute now.
Read guide
Claims9 min readHow UK Statutory Redundancy Pay Is Calculated
How statutory redundancy pay works in the UK: who qualifies, the age-banded formula, the weekly-pay cap, tax, and what to do if the redundancy is unfair.
Read guide
Rights8 min readNotice Periods in the UK: Your Rights Explained
The notice UK employees are entitled to: statutory minimums under the Employment Rights Act 1996, notice pay, PILON, garden leave, and unpaid notice.
Read guide