Years ago I worked in construction in Canada, my employer took all relevant deductions from my pay which included Canadian Pension Plan, much like US Social Security, I found out a couple of years ago from Canada that I could apply for pension, I receive a small amount monthly in US dollars directly into my US Bank, when I do US taxes I am directed to add this amount to my US Social Security, does UK and Canada have different agreements on taxing Canadian Social Security? Does anyone have similar income from Canada and how do they handle it? I do my taxes in UK by Self Assessment as all my income here comes from retirement from the US.