Many clients ask me this when filling out an application form:

“It asks for my UCI number… what is it?”

It seems like a simple field, but it reflects how immigration applications are actually reviewed.

UCI, or Unique Client Identifier, is the number IRCC uses to identify you in its system. The first time you submit an application, a record is created and a UCI is assigned. From that point forward, any application you submit is linked back to that same record.

This means your application is not being assessed on its own. It is being assessed in context. Officers are able to see your prior applications, timelines, status history, and previous disclosures through that identifier.

What you provide in a current application does not exist independently. It sits alongside everything that has been submitted before. This is where consistency becomes important. UCI ensures that the officer is looking at one continuous record, rather than separate, unrelated filings.

In most cases, a UCI does not change, even as a person’s status evolves from visitor to student to worker to permanent resident. Each individual has their own UCI, including children. If someone has never applied before, they may not have one yet, but once assigned, it is used for future interactions with IRCC.

From a practical standpoint, it is worth keeping a record of your UCI. Over time, people may forget application numbers or specific filings, but this is the number IRCC relies on to locate a person’s history in the system.

Canada has many identification numbers. Within the immigration process, this is the one that appears consistently across applications.
Simply put, it is your file number in the immigration system.