Changing an employment contract can be necessary when a business needs to alter working hours, duties, pay, location, notice periods, benefits or working arrangements. However, employers need to be careful. A contract cannot usually be changed simply because the business wants different terms.
Many employers need flexibility, especially where trading conditions, staffing needs or working patterns have changed. Even so, contract changes can create legal risk if employees are not consulted properly or if changes are imposed without agreement.
If the process is handled badly, the business may face grievances, breach of contract allegations, unlawful deductions claims, constructive dismissal arguments or employment tribunal claims.
If you need practical guidance before making changes, you can visit our free initial employment law advice page. Early advice can help you decide whether the change can be agreed informally or whether a more careful process is needed.
Why changing an employment contract needs care
Employers sometimes assume that because the business needs a change, employees must accept it. That is not always the case. An employment contract is a legally binding agreement, and changes should usually be made with the employee’s agreement.
Some contracts include flexibility clauses, but employers should not rely on them too casually. A flexibility clause may help in some situations, but it does not give unlimited power to change important terms unfairly or unreasonably.
Changing an employment contract is safest where the business reason is clear, the employee is consulted, and any agreement is properly recorded in writing.
Changing an employment contract by agreement
The cleanest route is usually to seek agreement. The employer should explain what change is proposed, why it is needed and when it would take effect.
For example, the business may need to change hours, introduce hybrid working arrangements, alter duties, amend commission terms or update notice provisions. The employee should be given a proper opportunity to ask questions and raise concerns.
If agreement is reached, confirm the change in writing. This may be done by a contract variation letter, updated contract, or written confirmation signed by both parties.
For more detail on this area, see our page on changing contracts of employment.
Changing an employment contract without agreement
Changing an employment contract without agreement is much riskier. If the employer imposes the change, the employee may object, work under protest, bring a claim, resign and claim constructive dismissal, or argue that the employer has breached the contract.
Some employers try to impose changes gradually, hoping employees will accept them by continuing to work. That can be risky if the employee makes clear that they do not agree.
Where agreement cannot be reached, the employer may need to consider a more formal consultation process. In some cases, dismissal and re-engagement may be considered, but that is a serious step and should not be used lightly.
Common contract changes employers consider
Employers may need to change contracts for many legitimate business reasons. However, the more important the term, the more careful the employer needs to be.
Common changes include:
- changes to pay, hours, duties, workplace location or shift patterns;
- changes to notice periods, bonus schemes, commission or benefits;
- changes linked to restructuring, cost savings or new working arrangements.
Changes to pay, hours or location are especially sensitive because they can directly affect the employee’s income, work-life balance and personal arrangements.
Consultation before changing terms
Consultation is often important, particularly where the change is significant or affects several employees. The employer should explain the business reason, listen to concerns and consider alternatives.
Consultation does not always mean the employee has a veto. However, it should be genuine. If the employer appears to have already decided the outcome, the process may be criticised later.
Good records matter. Keep notes of meetings, letters, employee responses and any alternatives considered.
Using flexibility clauses
Some employment contracts contain flexibility clauses. These may allow the employer to make certain changes, such as adjusting duties, workplace location or working patterns.
However, flexibility clauses should be used carefully. The employer should still act reasonably, give proper notice where appropriate, and consider the impact on the employee.
A badly handled change can still lead to a dispute, even if the contract contains wording that appears to help the employer.
Dismissal and re-engagement
If employees refuse to agree to a necessary change, an employer may consider dismissing and offering re-engagement on new terms. This is sometimes called “fire and rehire”.
This approach carries significant legal and employee relations risk. Employers should consider whether there is a sound business reason, whether consultation has been meaningful, whether alternatives have been explored and whether dismissal would be reasonable in all the circumstances.
It should usually be treated as a last resort, not a shortcut. If the process is poor, the business may face unfair dismissal claims or wider workplace disruption.
Updating written contracts
If changes are agreed, the written contract should be updated clearly. Employers should avoid relying on vague conversations or assumptions.
Written confirmation helps avoid later disputes about what was agreed and when the change took effect. It also helps managers and payroll apply the new terms correctly.
If you are reviewing existing terms more widely, our contracts of employment page may also be useful.
How employers can prepare before seeking advice
Before taking advice, gather the current contract, handbook, any flexibility clauses, details of the proposed change and the business reason for it.
It is also useful to prepare a short note explaining who will be affected, whether employees have already been consulted, and whether anyone has objected.
This makes it easier to assess whether the proposed change is low-risk, whether agreement is likely, and whether a formal consultation process is needed.
Final thoughts
Changing an employment contract can be necessary, but employers should not treat it as a simple management instruction. The safest route is usually to explain the business reason, consult properly and seek agreement.
Where employees object, or where the change affects pay, hours, location, duties or benefits, the business should be careful before imposing new terms. Specific advice is usually sensible before taking any step that could lead to resignation, dismissal or a tribunal claim.
For wider support, visit our free employment law guidance for employers page.