The CAS (Confirmation of Acceptance for Studies) is the single most important document for your UK student visa. Without a CAS number, you cannot even begin your visa application. Yet many Bangladeshi students don't fully understand what CAS is, how it works, or why universities sometimes refuse to issue it. This guide clears everything up.
1. What Is CAS?
CAS stands for Confirmation of Acceptance for Studies. It's a unique electronic reference number that your UK university assigns to you once they've confirmed your place AND are satisfied that you're a genuine student with proper qualifications and funding.
Key facts:
- CAS is NOT a letter — it's an electronic record on the UKVI database
- You receive a CAS number (a unique reference like "E4G0F5J2R8X")
- Your university enters your details into the UKVI Sponsor Management System
- The visa officer accesses these details using your CAS number during your visa application
- CAS is valid for 6 months from the date of issue
- Each student gets one CAS per application — if you change universities, you need a new CAS
2. What CAS Contains
The CAS includes all the information the visa officer needs:
- Your full name, date of birth, nationality
- Course title, level, and duration
- Course start date and end date
- Tuition fee and how much you've already paid
- Whether ATAS clearance is required (for certain STEM subjects)
- Your English language ability — how the university assessed it
- Documents the university used to make their decision
This is why CAS is so important — the visa officer relies on it heavily. If anything on your CAS is incorrect, your visa can be refused.
3. How to Get CAS
CAS is issued AFTER you:
- Accept your unconditional offer (meet all conditions including IELTS)
- Pay the tuition deposit (usually £2,000-5,000)
- Submit your CAS request form (some universities require this separately)
- Provide your financial documents (some universities check finances before issuing CAS)
Timeline: After you complete all requirements, CAS is typically issued within 5-15 working days. Don't leave this until the last minute — if there are issues, you need time to resolve them before your visa appointment.
4. Why CAS Gets Refused or Delayed
Universities have a legal obligation to only issue CAS to genuine students. They can refuse CAS even after giving you an offer. Common reasons:
- Academic fraud suspicion: If the university suspects your transcripts, IELTS score, or qualifications are not genuine, they will withhold CAS. This is increasing as universities use verification services
- Financial concerns: Some universities check your bank statements before issuing CAS. If they doubt your ability to pay tuition + living costs, they may refuse
- Previous visa refusals: If you've been refused a UK visa before, some universities are hesitant to issue CAS (they have refusal rate quotas)
- Incomplete documents: Missing transcripts, expired IELTS, or unsigned documents
- ATAS not obtained: For certain STEM programmes, you need ATAS clearance before CAS is issued
- Credibility concerns: If your academic profile doesn't match the programme level (e.g., very low grades applying for a top programme), the university may question your genuine student intent
5. How to Protect Yourself
- Submit authentic documents: Never alter or fabricate any document. Universities use verification services and UKVI conducts audits
- Pay the deposit promptly: Delayed payment = delayed CAS. Some universities cancel offers if deposit isn't paid by deadline
- Respond to university emails quickly: If the CAS team asks for additional documents, respond within 2-3 days
- Choose the right programme: If your academic background doesn't match the programme, the university may flag it. Choose programmes that align with your qualifications
- Declare any previous refusals: Be honest about previous visa refusals. Hiding them and getting caught later is far worse
6. FAQ
Can I get CAS from multiple universities?
You can receive offers from multiple universities, but typically use only one CAS for your visa application. If you change your mind, you need to request CAS cancellation from the first university before the second one issues a new CAS.
What if my CAS has wrong information?
Contact your university immediately. They can amend the CAS on the UKVI system. Do NOT submit a visa application with incorrect CAS information — it will be refused.
How long is CAS valid?
6 months from the date of assignment. You must submit your visa application within this period. If it expires, you need a new CAS from your university.
Does CAS guarantee my visa?
No. CAS is necessary but not sufficient. The visa officer still assesses your finances, English language, genuine student intent, and immigration history independently. CAS confirms the university's part — the visa decision is UKVI's.