Spousal sponsorship is one of the most document-heavy IRCC applications because the relationship itself must be proven — not just identity, eligibility, and finances. IRCC takes "marriage of convenience" detection seriously, and even genuine couples can face refusal if their documentation is weak or contradictory.
This checklist covers both inland (sponsoring a partner already in Canada) and outland (partner abroad) applications. Some documents differ slightly between the two streams.