Cas number for uk student visa explained

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The United Kingdom is one of the top destinations for international students. With world-class universities, diverse programs, and opportunities for career growth, the UK attracts thousands of students every year. However, studying in the UK requires proper legal documentation, and one of the most crucial elements of the student visa process is the CAS number.

Understanding the CAS number, how it works, and its role in your visa application is essential for a smooth and successful UK student visa process. This comprehensive guide explains everything you need to know about CAS numbers in 2026.

What is a CAS Number?

CAS stands for Confirmation of Acceptance for Studies. The CAS number is a unique reference issued by a licensed UK educational institution to an international student who has been accepted for a course of study.

It acts as your official confirmation that you have a valid offer to study in the UK and is mandatory for applying for a UK Student Visa. Without a CAS, your visa application cannot be processed.

Key points:

  • Issued only by universities licensed to sponsor international students
  • Contains a unique reference number and other details about your course
  • Valid for 6 months from the date of issue

Why is a CAS Number Important?

The CAS number is more than just a reference number—it is a crucial part of the visa application process. Its importance includes:

  1. Proof of Acceptance
    • Confirms that you have a valid offer to study in the UK
  2. Visa Application Requirement
    • A CAS number is mandatory for submitting a student visa application
  3. Contains Key Information
    • Includes your course details, tuition fees, study mode, and personal information
  4. Reduces Fraud Risk
    • Ensures that only verified students are applying for visas
  5. Tracks Your Immigration Status
    • UK Home Office uses CAS to link your visa to your university enrollment

Information Contained in a CAS Number

When a university issues a CAS, it contains detailed information that the UK Home Office uses to verify your application. This includes:

  • Your full name as per your passport
  • Date of birth
  • Nationality
  • Passport number
  • Course start and end date
  • Mode of study (full-time/part-time)
  • Tuition fees and payment status
  • Immigration history in the UK
  • Sponsor license number of the university

Note: The CAS number itself is unique and typically consists of letters and numbers, which is used to reference your specific confirmation.

Who Can Issue a CAS Number?

A CAS number can only be issued by a UK university or college that is a licensed Tier 4/Student sponsor. Not every institution in the UK can issue CAS numbers.

Licensed institutions are listed on the UK Home Office Register of Sponsors. Only these universities can provide CAS for student visa purposes.

Eligibility Criteria to Receive a CAS Number

To be issued a CAS number, international students must meet certain eligibility requirements set by the university and UK visa regulations:

  1. Offer of Admission
    • You must have an unconditional offer or a conditional offer that you are able to meet
  2. Payment of Tuition Fees
    • Some universities may require full or partial payment before issuing a CAS
  3. English Language Proficiency
    • Proof of English proficiency is usually required (IELTS, TOEFL, PTE Academic)
  4. Academic Requirements
    • You must meet the entry requirements for your chosen course
  5. Financial Proof
    • Demonstrate that you can support your living costs in the UK
  6. ATAS Certificate (if applicable)
    • Required for certain sensitive subjects in science and technology

When Should You Receive Your CAS Number?

The CAS number is usually issued 3–6 months before the start of your course, allowing sufficient time for visa application and processing.

  • Bachelor’s programs: CAS typically issued after meeting academic and financial requirements
  • Master’s programs: CAS issued after confirming tuition payment or scholarship
  • PhD programs: CAS issued once research plan and funding are verified

Tip: Do not apply for a visa without a CAS number. Your application will be rejected.

How to Apply for a CAS Number

Applying for a CAS number is usually straightforward. Here’s a step-by-step guide:

Step 1: Receive Your University Offer

  • Obtain an unconditional or conditional offer from a licensed UK university

Step 2: Meet University Requirements

  • Pay tuition fees (full or partial) if required
  • Submit proof of English language proficiency
  • Provide academic transcripts and any other required documents

Step 3: Request CAS from Your University

  • Contact the admissions or international office
  • Provide personal details and documentation requested by the university

Step 4: Receive CAS and Check Details

  • Once issued, carefully check all details in your CAS, including:
    • Name spelling
    • Passport number
    • Course start and end dates
    • Tuition fee information

Important: Any errors in CAS details can delay or reject your visa application.

Validity of a CAS Number

A CAS number is valid for 6 months from the date of issue, but your visa application must be made within this period.

  • Applying after 6 months requires a new CAS
  • You cannot use a CAS from a previous academic year or a different course

Using a CAS Number for Your UK Student Visa Application

The CAS number is a central part of your visa application. You will need it to:

  1. Fill in the visa application form online
  2. Provide the unique CAS number in the “Confirmation of Acceptance” section
  3. Upload CAS details when requested

Note: The CAS itself is not sent to the UK Home Office; the university confirms the information electronically.

How Much Does a CAS Number Cost?

  • Universities do not charge separately for issuing a CAS
  • Costs are included in tuition fees or administrative fees
  • Ensure your tuition payments are complete as per the university’s requirement

Common Mistakes to Avoid Regarding CAS

  1. Using Incorrect or Expired CAS
    • Only use CAS issued by your current course and university
    • Expired CAS leads to rejection
  2. Not Verifying CAS Details
    • Always check personal information, course dates, and tuition fees
  3. Requesting CAS Too Early or Too Late
    • Request within the timeframe advised by the university
  4. Not Meeting Pre-requisites
    • Ensure academic, financial, and English requirements are met before requesting CAS

CAS for Dependent Visa Applications

If you are bringing family members to the UK:

  • Your CAS will indicate whether dependents are allowed
  • Must meet additional financial requirements for each dependent
    • Example: £680/month per dependent in London
    • £570/month per dependent outside London

CAS Number vs. Visa Approval

  • CAS Number: Issued by the university; confirms acceptance and course details
  • Visa Approval: Issued by UK Home Office; allows entry to the UK

A CAS number does not guarantee visa approval, but it is mandatory to apply. Visa decisions depend on financial, health, and immigration checks.

FAQs About CAS Number

Q1: Can I get a CAS for multiple courses?

  • Yes, each course requires a separate CAS.

Q2: What if my CAS is incorrect?

  • Contact your university immediately for correction.

Q3: Can I get a CAS without paying tuition?

  • Some universities may issue CAS with partial payment or scholarship confirmation.

Q4: Can a CAS expire before I apply for a visa?

  • Yes, CAS expires 6 months after issuance. A new CAS is needed if delayed.

Q5: Do short-term courses require CAS?

  • No, short-term study visas typically do not require a CAS.

Tips to Ensure Smooth CAS and Visa Process

  1. Start Early – Request CAS as soon as you meet all university requirements
  2. Keep Documentation Ready – Bank statements, transcripts, English test results
  3. Double-Check Details – Name, passport number, course dates, tuition fees
  4. Communicate with University – Follow up on CAS issuance and corrections if needed
  5. Plan Visa Application – Apply within 6 months of CAS issuance

Conclusion

The CAS number is a critical part of the UK student visa application process. Issued by licensed universities, it confirms your acceptance, course details, and eligibility to study in the UK. Understanding its importance, validity, and application process ensures that you can apply for a student visa smoothly.

While CAS alone does not guarantee visa approval, it is a prerequisite, and errors or delays in CAS can lead to rejection or postponement. By following this guide, international students can navigate the CAS process confidently and focus on preparing for their UK study experience.

Obtaining your CAS correctly, along with meeting financial, academic, and English language requirements, sets the foundation for a successful UK student visa application.

Studying in the UK is a rewarding opportunity, and mastering the CAS process is the first step toward achieving your academic and professional goals.