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... and if the checks qualify as "pensions or annuities" then they will be taxed in Canada using the same exemption rules as would apply in the U.S. (according to the Treaty).
If they are taxable to you in US, then they are very likely taxable in Canada as well. They are not 'integrated' with Soc Security, they probably are calculated based on what SS you receive, which is a different thing.
nelsona non grata. Non pro. Please Search previous posts, no situation is unique as you might think. Happy Browsing