An invitation to apply is a document issued by Immigration, Refugees and Citizenship Canada (IRCC) to candidates in the Express Entry pool. The ITA is an auto-generated correspondence issued to Express Entry candidates through their online account. What is an Invitation to Apply (ITA)?. An Invitation to Apply (ITA) is an invitation that allows some people who submitted a. One must receive an ITA (Invitation to Apply) to become a permanent resident in Canada.