One Key Visa

Understanding CAS and the Student Route Visa

What Is a CAS?

CAS stands for Confirmation of Acceptance for Studies. It’s an official document (actually a digital number) issued by your university once you’ve accepted an offer and met their conditions — such as English proficiency or financial requirements.

You can’t apply for a UK student visa without a CAS. It links your visa application to a specific course and university.

Key details included in your CAS:
What Is the Student Route Visa?

This is the visa international students need to study in the UK for longer than 6 months. It replaced the Tier 4 visa.

Key requirements:

When Can You Apply?

You can apply up to 6 months before your course starts (if applying from outside the UK). Most students apply 1–3 months before their course begins.