Contract variation

A variation changes an agreement that already exists

A contract variation changes one or more existing employment terms, such as pay, hours, duties or workplace. Both sides can propose a change. Lasting changes usually need agreement, whether the original contract was written, verbal or formed through conduct.

A flexibility or variation clause is not a blank cheque. Read its wording, use it for the purpose it was meant to cover and act reasonably. A broad clause does not remove the need to explain a significant proposal or consider its effect on the employee.

The Acas guidance for employers considering changes starts with a useful question: what problem is the change meant to solve, and is a contractual change actually needed?

Consultation comes before the updated document

Explain the proposed change, the reason, who is affected and the intended timing. Give employees a genuine chance to ask questions, raise concerns and suggest alternatives. Consult recognised unions or employee representatives where the arrangement or law requires it.

Check connected issues separately. A move in hours may affect childcare or disability arrangements. A workplace change may affect travel or homeworking. A pay change can create minimum-wage or equality risks. Solving the contract wording does not solve those consequences by itself.

Confirm exactly what changed

When agreement is reached, write down the old term, new term, effective date and whether the change is permanent, temporary or subject to review. Update the written particulars within the required period and keep the evidence of agreement with the current contract.

If agreement cannot be reached, pause before considering unilateral change or dismissal and re-engagement. Those routes carry separate legal and employee-relations risks. Northern Ireland employers should check the nidirect guidance on changing conditions.