If you’re applying to study in the UK, chances are you’ve already run into the term CAS letter somewhere in the process, usually right around the point where you think your application is nearly done. It isn’t quite that simple, and the name doesn’t help much either, since a CAS isn’t really a “letter” in the way most people picture one.
Here’s the good news: once your education provider issues your CAS, it means they’ve carried out the checks needed to sponsor you for your course. That’s real progress. But it’s not the finish line, and there are still a few things worth understanding before you move on to your actual visa application.
In this guide, Nejat Immigration Ltd walks through what a CAS letter actually is, how you get one, what to double-check once it arrives, and what your options are if something doesn’t go to plan.
What Is a CAS Letter, Exactly?
CAS stands for Confirmation of Acceptance for Studies. Despite the name, it isn’t a physical letter or a certificate you frame and put on a wall. it’s an electronic sponsorship record, issued by a UK education provider licensed to sponsor international students.
What you’ll actually work with is a CAS reference number, assigned by your university or college, which you’ll enter when you complete your UK Student Visa application.
Behind that reference number sits a fair amount of detail: information about you, your course, your education provider, your fees, and your course dates. In short, your CAS is your university’s confirmation that it’s sponsoring you on an eligible course.
One thing worth flagging early: getting a CAS doesn’t mean your visa is guaranteed. You still need to satisfy the other requirements of the Student Visa route.
Why Does a CAS Matter for Your Student Visa?
Before the Home Office can even begin assessing your application, it needs to know what course you’re studying and who’s sponsoring you. That’s exactly the job your CAS does — it links your visa application to your education provider’s sponsorship record.
No valid CAS, generally speaking, no valid application under the standard Student Visa route.
Your CAS typically includes:
- Your name and personal details
- The name of your university, college, or other education provider
- Your course title and level of study
- Course start and end dates
- Your tuition fees, and anything you’ve already paid
- Details of relevant qualifications and English language assessment, where applicable
Read through these details properly rather than just lifting the reference number and pasting it into your form. small errors here can cause bigger headaches later.
How Do You Actually Get a CAS?
A common misconception: students assume that once they’ve got an offer, they can go straight ahead and apply for a visa. In reality, there are usually a handful of steps in between.
1. Secure an Offer From a Licensed Education Provider
You’ll need an offer for an eligible course from a provider holding a valid Student sponsor licence. Depending on the course, you may be asked for academic certificates, transcripts, English language evidence, and other supporting documents before the offer is confirmed.
2. Satisfy Any Conditions Attached to Your Offer
Many offers are conditional, meaning there’s something you still need to do before the university confirms your place and moves ahead with the CAS. That might mean hitting certain grades, finishing your current studies, submitting extra documents, or meeting an English language requirement.
Read your offer letter closely so you know exactly what’s expected of you, and by when.
3. Get Through the CAS Process
Once you’ve met the relevant conditions, your university may run you through a few additional checks a pre-CAS questionnaire, a short interview, confirmation of your personal details, or requests for more background information. Some institutions carry out further checks before deciding to assign a CAS at all.
If your university reaches out asking for something, respond quickly. Slow replies are one of the most common (and easily avoidable) causes of delay.
4. Pay Any Required Tuition Deposit
Some universities ask for an initial tuition payment before they’ll assign your CAS. How much, and whether it applies to you, depends on your offer conditions and the institution’s own policy, so check the official instructions from your university rather than guessing.
5. Receive Your CAS Reference Number
Once your provider has finished its checks and agreed to sponsor you, it issues your CAS usually by email or through the university’s student portal.
Before you go anywhere near your visa application, take a few minutes to actually read it. If something doesn’t match your documents, get in touch with your university. Don’t assume it won’t matter.
What Should You Check Once Your CAS Arrives?
Receiving your CAS feels like a milestone and it is, but it’s worth resisting the urge to file it away unread. Even a small discrepancy can turn into a problem if it’s not sorted out beforehand.
Here’s what to look at closely:
Personal information — is your name and other detail correct?
Course details — do the course title, level of study, and provider all match?
Course dates — do the start and end dates line up with what your university told you?
Tuition fees — are the fees and any recorded payments accurate?
Qualifications — where relevant, is your academic information correct?
English language assessment — check what’s been recorded, if applicable.
Spot a mistake? Contact your university’s admissions or CAS team straight away. They’ll tell you whether it’s a simple correction or whether you need an entirely new CAS.
Sorting this out before you apply is a lot easier than untangling it afterwards.
How Long Does a CAS Letter Stay Valid?
Timing catches people out more often than you’d think.
As a general rule, your CAS needs to have been issued within six months of the date you submit your visa application. On top of that, there’s a separate question of when you’re allowed to apply relative to your course start date.
If you’re applying from outside the UK, you can generally submit up to six months before your course starts. Applying from inside the UK is usually limited to three months before the start date, alongside other eligibility conditions.
If your course start date is creeping closer, don’t leave your application until the last minute give yourself room to gather documents, complete the form, and attend any appointment that’s required. And always check the current rules for your specific situation, since these details can shift.
Does a CAS Guarantee Your Visa Will Be Approved?
No — and this is probably the most important point in this entire guide.
A CAS confirms your education provider is sponsoring you for an eligible course. It says nothing about whether the Home Office will approve your visa. That assessment is separate, and it looks at things like whether you meet the financial requirement, satisfy any English language requirement, and have submitted the correct supporting documents.
Depending on your nationality, where you’re applying from, your course, and your immigration history, other requirements might apply too. Some applicants need a tuberculosis test certificate or an Academic Technology Approval Scheme (ATAS) certificate. Students under 18 face additional requirements around age and care arrangements.
Your CAS is a necessary piece of the puzzle — not a guarantee of the outcome.
What If There’s a Mistake on Your CAS?
Spotting an error on your CAS is stressful, particularly if your course start date is approaching fast. Still, the right move is to deal with it right away rather than hope it sorts itself out.
Start with the university or college that issued the CAS. Tell them what looks wrong and send over whatever documents help clarify things. They’ll be able to tell you whether the record can simply be corrected, or whether you’ll need a fresh CAS altogether.
If you’ve already submitted your visa application, the right next step may look different. that’s a situation worth getting specific advice on, rather than guessing. And don’t brush off a minor-looking error; sometimes small details matter more than they appear to.
Can You Switch Universities After Getting a CAS?
Yes, that’s usually possible, but don’t assume your existing CAS will simply carry over to the new institution. It won’t. A CAS is tied to a specific provider and a specific course.
If you’re considering a change, talk to both your current and prospective university before making any firm decisions, since the sponsorship and immigration requirements will need checking. You may need a new CAS, and potentially a new visa application, depending on your circumstances. If you already hold a Student Visa, there may be extra rules to navigate before you can start with a different provider.
Getting advice before you commit to switching can save you a lot of complications down the line.
What Happens If Your CAS Is Withdrawn, or Your Visa Is Refused?
Plans don’t always go the way students expect. An education provider can withdraw its sponsorship, and the Home Office can refuse an application and what happens next depends heavily on the specific reason behind it.
If you’re refused, read the decision letter carefully. It should set out why the application didn’t succeed and what, if anything, comes next.
Depending on the circumstances, you might be able to submit a fresh application, or there may be a review or appeal route available, though this isn’t guaranteed in every case, and deadlines can apply. Before deciding what to do, weigh up the refusal reasons, the evidence you originally submitted, and how much time you have before your course is due to start.
Taking a moment to properly understand what went wrong tends to lead to a much better next decision than reacting immediately.
Frequently Asked Questions About CAS Letters
Is a CAS letter the same thing as a university offer letter?
No. Your offer letter confirms the university has offered you a place, possibly with conditions attached. A CAS is a separate electronic sponsorship record used specifically for your Student Visa application, and it often arrives well after your offer.
Can I apply for a UK Student Visa without a CAS?
Generally, no — a valid CAS reference is required for a standard application. If your university hasn’t issued yours yet, reach out to their admissions or international student team to find out what’s still outstanding.
Where do I find my CAS number?
Your education provider will usually send it by email or post it to your student portal. If you can’t locate it, contact the university directly. don’t guess or enter the wrong number on your application.
Can I reuse the same CAS if my visa is refused?
Generally not. a CAS already used in a refused application usually can’t simply be reused. Check with your education provider on whether a new one is needed.
Do I need to pay my tuition fees in full before I get a CAS?
Not necessarily. Some universities ask for a deposit; others have different arrangements entirely. Your provider will tell you what’s expected and confirm what’s already been recorded as paid.
My CAS has expired — now what?
If it was issued more than six months before your intended application date, it will generally no longer meet the validity requirement. Get in touch with your education provider to discuss getting a new one assigned.
Planning to Study in the UK? Nejat Immigration Ltd Can Help
Getting your CAS is a genuine milestone, but it’s only one part of a longer process. What comes next, preparing the application properly, understanding what’s required, and making sure your documents line up, often makes the biggest difference to how smoothly things go from here.
At Nejat Immigration Ltd, we help individuals and families navigate UK immigration matters, including Student Visa applications. Whether you have questions about your CAS or you’re dealing with a previous refusal, our team is here to talk through your situation and what support might help.
Contact Nejat Immigration Ltd
UK Office: (00441213395171)
UK WhatsApp: (00447821206730)
Tehran Office: (021-88602840) / (021-88614510)
Website: https://www.nejat.uk
Please note: This article is intended as general information and does not guarantee a successful visa outcome. UK immigration rules change from time to time, so always check the latest official guidance for your own circumstances.
Official Sources
For further information, visit the official UK Government website:
- Student Visa: Your course and CAS requirements
- Student Visa: Documents you must provide
- Immigration Rules: Appendix Student