Once you receive an Invitation to Apply (ITA) through Express Entry, you have 60 days to submit a complete electronic Application for Permanent Residence (eAPR). Missing or incorrect documents are the #1 reason for refusal — and you can't add documents after submission, only respond to officer requests.
This checklist covers documents needed for the eAPR. Build your file before your ITA arrives — once it's issued, the 60-day clock is unforgiving.