UCI vs Application Number Canada: IRCC File Guide

UCI and Application Number for Canada Immigration: IRCC File Guide

Are you trying to check a Canadian immigration application but unsure whether IRCC needs your UCI or application number? These identifiers serve different purposes. Entering the wrong one can prevent you from accessing the correct record or completing a form accurately.

Your Unique Client Identifier (UCI), also called a client ID, identifies you across your dealings with Immigration, Refugees and Citizenship Canada (IRCC). An application number, sometimes called a file number, relates to one specific application. Ansari Immigration Law explains how to locate each number, understand its format, and use the correct details when checking your immigration file.

Knowing the difference is useful whether you have applied for permanent residence, a study permit, a work permit, or Canadian citizenship.

What Is a UCI Number in Canadian Immigration

A Unique Client Identifier (UCI) is a personal identification number assigned by IRCC to identify you in its records. It is also known as a client ID. Unlike an application number, your UCI generally stays the same across different immigration applications. A UCI typically appears in one of these formats:

• 0000-0000 (8 digits)
• 00-0000-0000 (10 digits)

Where Can You Find Your UCI

Check your previous IRCC correspondence and immigration documents. Your UCI may appear on:

• Permanent resident (PR) cards
• Study permits and work permits
• Official IRCC letters
• Other immigration documents issued to you

You can also consult the Canadian government’s official guidance on locating your UCI or client ID. What if you are applying for the first time? If you have never applied to IRCC before, you may not have a UCI yet. Follow the instructions on the relevant form.

IRCC advises first-time applicants to enter “N/A” or “Not Applicable” when permitted. If an online form does not accept this entry, leave the field blank. Do not create your own number or use another person’s UCI to complete your application.

What Is an IRCC Application Number or File Number

An IRCC application number identifies a specific application that the department has begun processing. People often call it a file number because it helps IRCC identify and track an individual case.

Unlike your UCI, your application number changes when you submit a separate application. For example, you may use the same UCI for a work permit and a permanent residence application, but each application has its own reference number.

What Does an Application Number Look Like

IRCC application numbers usually contain one letter followed by nine digits. Examples include:

• C123456789 for a citizenship application
• W993830598 for a work permit application
• E099977028 for an economic class application

These examples illustrate the usual format. Always copy the number assigned to your own application.

Where Can You Find Your IRCC File Number

Look for your application number in:

• Your Acknowledgement of Receipt (AOR) letter or email
• IRCC correspondence, including relevant citizenship test or ceremony invitations
• Your online IRCC account, under the submitted applications or account messages section

IRCC generally provides the number when it starts processing your application. An automatic email confirming online submission is not necessarily your AOR. IRCC first needs to check that your application is complete.

If you have not received an AOR, check the instructions for your application type before assuming that your file number is missing. You can read the government’s official explanation of application numbers.

UCI vs Application Number: Key Differences

Although both numbers help IRCC identify your records, they are not interchangeable.

For applicants preparing a permanent residence submission, Canada permanent residency services can provide relevant information about the application process. Keeping your UCI, application number, previous correspondence, and submitted documents organised also makes it easier to respond to requests from IRCC.

Remember that a study permit’s document number is another distinct identifier. It refers to the permit document itself, not your personal UCI or a separate application.  Read the related guide, How to Find Your Canadian Study Permit Document Number, to understand the difference.

How to Check Your IRCC Application Status

Once you have the required identification details, use the official status service that matches your application type and submission method. Follow these steps:

1. Identify Your Application Type: Determine whether you applied for permanent residence, a work permit, a study permit, citizenship, or another immigration service.
2. Gather Your Identification Details: Find your UCI, application number, date of birth, and relevant correspondence. The exact information required depends on the service.
3. Open the Official IRCC Status Page: Use the Government of Canada’s application status guidance to select the appropriate tool.
4. Sign-in or Enter the Requested Details: Some services require an online account, while others accept application identifiers directly.
5. Review Your Messages and Updates: Check whether IRCC has requested further documents or provided instructions.

Some application status tools require only a UCI or application number, while others require both. The requirements also differ by application category.

If you have applied online, check the account you used to submit your application. You may need a separate IRCC account to link an existing application or access a dedicated status tracker.

Common Mistakes to Avoid When Checking Your IRCC File Number

A few simple checks can help you prevent confusion when dealing with your IRCC file.

• Using Your UCI as the Application Number: Read the field label carefully and enter the identifier the service requests.
• Assuming Every Number is Interchangeable: A UCI, application number, permit document number, and passport number serve different purposes.
• Expecting a File Number Immediately: IRCC may need time to review your submission before issuing an AOR or application number.
• Entering an Invented UCI: If you are applying for the first time, follow the form’s instructions for a missing client ID.
• Checking the Wrong Online Account: Use the official IRCC guidance to identify the correct status service for your application type.

If your application does not appear in an online tool, review the eligibility requirements for that tool and confirm that you have entered the correct details before taking further action.

Frequently Ask Questions