You are not required by law to provide a reason for taking annual leave.
However, if you need to take leave during a peak period at work, explaining your reasons may help you reach an agreement.
If you need to take leave on a certain date, you should also let your employer know as early as possible so that they can better accommodate your request.
Annual leave is important for employees’ well-being. Happy employees are productive employees. It is good practice for employers to help employees achieve a good work-life harmony by allowing them to use their annual leave entitlement.