Tier 4 student visa holders are normally restricted to working up to 20 hours per week, which includes casual hours.
Where a Tier 4 visa holder plans to work more than 20 hours in any week, they should email their name, student number and course to the Staff Immigration Team (SIT): Tier4casualpayments@admin.ox.ac.uk
Furthermore, if a student is a postgraduate research student or a PhD student, a letter from their supervisor should be provided which confirms the dates that the student is "on holiday" and does not have any study commitments.
This will allow SIT to authorise the payment. If you know any Tier 4 student who will be working over 20 hours in a week, please make them aware of this change. All Tier 4 students have also been informed of this requirement.
Casual pay requests will not be processed for individuals with incorrect or incomplete right to work information in Core HR, or where there are questions over Tier 4 hours. If pay is stopped the Staff Immigration Team will inform the department why this has happened and a correct casual payment request will need to be resubmitted in the following month.