An employer can make a change ('variation') to an employment contract if:

• there's something in the contract that allows the change (usually called a 'flexibility clause')
• the employee agrees to the change
• the employee's representatives agree to the change (for example, a trade union)

An employer can force a new contract on employees, although this should be a last resort and could lead to legal action.

If there has been a TUPE transfer 

There are additional considerations when changing an employment contract after a TUPE transfer. TUPE stands for Transfer of Undertakings (Protection of Employment).

Find out more about changing an employment contract after a TUPE transfer.

Acas support for employers

An Acas adviser can talk you through:

• whether you can make a change ('variation') to an employment contract
• the steps in the process and a flowchart with links to further resources
• what's a legal requirement and what's good practice
• what support is available for your staff

To arrange an appointment, you can:

• send an enquiry form
• call: 0300 123 1150, Monday to Friday, 9am to 5pm