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Who can sponsor a spouse?
A Canadian citizen, a permanent resident or a person registered under the Indian Act, aged 18 or over. Section 133(1) of the Regulations then sets out what disqualifies a sponsor, and it is a long list: an unenforced removal order, detention, certain criminal convictions, default on a previous undertaking or on court ordered support, an undischarged bankruptcy, or receiving social assistance for a reason other than disability.
What is not on the list, for a spouse, is money. Paragraph 133(1)(j) sets a minimum necessary income, and subsection 133(4) switches it off where the sponsored person is the sponsor's spouse, common-law partner or conjugal partner with no dependent children, or with a dependent child who has no dependent children of their own.
That surprises people, and it is the single most useful thing to know before you decide whether to apply. A low income does not stop a spousal sponsorship. Being in default on a previous undertaking does.