What is a CAS number and how do I get one for a UK student visa?

A CAS (Confirmation of Acceptance for Studies) is a unique 14-character reference number issued by your UK university or college. It is the single most important document for your UK Student Visa (Student Route) application — you cannot apply for the visa without a valid CAS.

The CAS is generated by your institution through the UK Visas and Immigration (UKVI) Sponsorship Management System. It confirms that you have an unconditional offer for a specific course, that you meet the entry requirements, and that the institution is satisfied you are a genuine student.

You will typically receive your CAS after accepting your unconditional offer, paying your tuition deposit, and meeting any other conditions set by the university (such as an English language requirement). The CAS contains key information about your course including the start date, course level, annual tuition fee, and any funds the institution has assessed you as needing for maintenance.

A CAS is valid for 6 months from the date it is assigned. You must use it to apply for your visa before it expires.

Check your CAS carefully — if there are any errors (incorrect course dates, fees, or personal details), contact your institution immediately as mistakes can cause delays or complications in your visa application.

Your institution's international student office is the best point of contact for questions about your CAS.