Unilateral changes to employment contract

The general rule

Your pay, contracted hours, main duties and workplace are normally express or implied terms of your employment contract. As a matter of contract law in England and Wales, one party cannot lawfully change agreed terms without the other party’s consent. So the starting point is that your employer cannot simply impose a change to these things unilaterally. If they do, they are ordinarily acting in breach of contract.

That said, the answer depends heavily on what your contract actually says, the nature of the change, and how you respond to it. The phrase “without my agreement” is central, because agreement can be given expressly or, in some circumstances, inferred from conduct.

When your employer may be able to make a change

There are several situations in which a change may be lawful even though you have not signed a new contract.

Flexibility or variation clauses. Your contract may contain a clause allowing the employer to vary certain terms, for example a mobility clause permitting relocation, or a clause allowing reasonable changes to duties or hours. These clauses are read narrowly by the courts and must be exercised reasonably and with reasonable notice. A mobility clause, for instance, will not normally allow an employer to require you to move to a location outside reasonable commuting distance at short notice. A general clause allowing the employer to make “reasonable changes” is unlikely to permit a fundamental change such as a pay cut.

Genuine agreement. If you expressly agree to the change, in writing or verbally, it is binding. Agreement can also sometimes be implied from conduct, but only where your conduct clearly shows acceptance. This matters for what you do next, explained below.

Collective agreements. If a trade union has negotiated terms on behalf of your workforce and those terms are incorporated into your contract, a change agreed collectively may bind you even if you personally object.

Dismissal and re-engagement. An employer that cannot get agreement may lawfully terminate your existing contract on proper notice and offer to re-engage you on new terms. This “fire and rehire” route carries significant legal risk for the employer, including potential unfair dismissal claims, and there is a statutory Code of Practice on dismissal and re-engagement that tribunals must take into account. The law in this area has been tightening, so an employer using this route must follow a fair process.

If a change is imposed without your agreement

If none of the above applies and the employer simply imposes a change, they are in breach of contract. You then broadly have the following options, and the one you choose can affect your legal position.

1. Object clearly and continue working “under protest”. You keep working but make it plain in writing that you do not accept the change and are working only under protest while you dispute it. This helps prevent the employer arguing that you accepted the change by continuing to work. This is often sensible where the change takes effect immediately, for example a pay cut.

2. Continue working without complaint. If you carry on working under the new terms without objecting, especially where the change has an immediate practical effect such as reduced pay, a tribunal or court may infer that you accepted the change. Silence over a period can amount to implied agreement, so it is risky to say nothing.

3. Claim for the loss. If, for example, your pay is cut, you can bring a claim for the unpaid difference. Depending on the circumstances this can be an unlawful deduction from wages claim in the employment tribunal, or a breach of contract claim. An unlawful deduction from wages claim is often the most practical route because it is free to bring and can be pursued while you remain employed.

4. Resign and claim constructive dismissal. Where the change is a fundamental breach going to the root of the contract, such as a significant pay cut or a major change of duties or location, you may be able to resign and claim constructive unfair dismissal. This requires at least two years’ continuous service for an ordinary unfair dismissal claim, that you resign in response to the breach, and that you do not delay too long, as delay can be treated as acceptance of the change. This is a high-risk option because you give up your job and the outcome is uncertain, so it should not be the first step.

Key facts that change the answer

The right analysis depends on details you have not yet given. It would help to know exactly what your written contract says, including any flexibility, mobility or variation clauses. The precise change matters: a modest, reasonable adjustment to duties is very different from a pay cut or a requirement to relocate. Your length of service matters for unfair dismissal rights. It also matters whether the change is one with immediate financial effect and how the employer has communicated and consulted about it. If the change disadvantages you because of a protected characteristic, for example a change to hours that indirectly disadvantages carers or disabled employees, discrimination law may also be engaged.

Practical next steps

1. Read your contract and any staff handbook to identify the exact terms and any flexibility clauses. Note whether the handbook is contractual.

2. Do not sign anything or agree verbally until you understand the effect.

3. Put your objection in writing promptly if you do not agree. State clearly that you do not accept the change, and if it is being imposed, that you continue to work only under protest and reserve your rights. Keep copies of everything.

4. Raise it informally first, then through the grievance procedure if needed. Employers are expected to consult before making changes, and a documented grievance strengthens your position.

5. Gather evidence: your contract, payslips before and after, any letters or emails about the change, and notes of meetings.

6. Consider early conciliation through ACAS before any tribunal claim, which is a required step and can also lead to a negotiated resolution. Be aware of the strict time limits for tribunal claims, generally three months less one day from the act complained of, so do not delay if you are considering formal action.

Overall

In short, your employer generally cannot change your pay, contracted hours, main duties or workplace without your agreement, unless a valid and reasonably exercised contractual clause allows it, you agree, a binding collective agreement applies, or the employer lawfully terminates and re-engages you following a proper process. If a change is imposed, protect your position by objecting clearly in writing, being careful not to accept the change by silence or conduct, and choosing a remedy that fits the situation, keeping resignation and constructive dismissal as a last resort given the risks involved.