What is a UCI?
UCI stands for “unique client identifier.” It is also known as a client identification number (client ID). It appears on official documents you get from Citizenship and Immigration Canada (CIC). It has four numbers, a hyphen and four more numbers. (Example: 0000-0000).
If you are applying to CIC for the first time, you will not yet have a UCI. If so, and you are filling out a form that asks for one, write “Not Applicable” or “N/A” in the space provided.
If you are applying online and the form does not allow you to input “N/A,” leave the space blank.