Why do I need a CAS letter before I apply for my UK student visa?
You need a CAS letter because it carries a unique 14-digit reference number that you enter on your UK student visa application to link it with your university. It is typically valid for six months from issue, so check the official UK government page for the latest rules.
You need a CAS letter because its unique reference number connects your visa application to your university. The visa officer checks that number against your documents to confirm you hold an unconditional offer.
What the CAS Does for Your Visa
| Point | Detail |
|---|---|
| Unique reference number | A 14-digit number you enter on the visa application form |
| Validity | Typically six months from the date of issue |
| Who issues it | Many UK universities send it themselves, while a few ask you to apply for it |
| Checked by | The visa official, against your supporting documents |
If You Hold Several CAS Letters
- You may receive a CAS from more than one university.
- Before you apply for the visa, decide which university you will attend and use that CAS only.
- Any other CAS then becomes obsolete and cannot be used for a visa application.
- Your CAS statement arrives by email and lists course, sponsor and some money details, but check the official UK government page to see whether you need to submit it.
- If the details used to create the CAS do not match your visa form, the application could be refused.
My Advice
Match every detail on your visa form to the CAS exactly, and pick your final university before you apply. Rules and validity can change, so confirm them on the official UK government and university pages.
Not sure which documents your UK visa needs?
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