Our bilateral defence and national security relationship spans the full spectrum of cooperation, from shared defence of the continent; commitments to collective objectives through the North American Aerospace Defence Command (NORAD), the North Atlantic Treaty Organization (NATO), and the Five Eyes; intelligence sharing ...
Canadian tax residents are taxable by Canada on their global income which includes distributions from U.S. retirement plans. So, funds in an IRA, 401(k) and 403(b) may remain tax deferred until a distribution is taken from the plan.
If you have social security credits in both the United States and Canada, you may be eligible for benefits from one or both countries. If you meet all the basic requirements under one country's system, you will get a regular benefit from that country.
Fortunately, non-residents of Canada typically remain eligible for CPP and OAS payments. (It should be noted, though, that in order to receive OAS payments, Canadians living in the US must have lived in Canada for at least 20 years after turning 18.)
If you receive Canadian retirement or pension benefits while living in the US, you should report them on form 1040 or a 1040A (depending on which one you're filing).
The agreement with Canada helps many people who, without the agreement, would not be eligible for monthly retirement, disability or survivors benefits under the Social Security system of one or both countries.