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There's nothing on that website that supports the claim that
Canadians pay 48% of their income in taxes. Primarily because
it's not true.
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Well.... I suppose, if we add up ALL the taxes we pay (PST, GST,
property tax, water tax, garbage collection tax, sewer tax, drivers
licence fee, hidden "taxes" like fishing licences, etc, etc...) it
might come close to 48%, don't you think?

I still don't think it's that high. Of course, if you did do that,
then you'd
have to do a calculation of ALL taxes on both sides of the border to
do a comparison. Canada's income taxes are higher in comparison
to US income taxes. But in Canada, CPP and EI (payroll taxes) are
lower than the US's FICA and Medicare contributions, which evens it
out some. You'd also have to include whatever amounts are being paid
in health insurance premiums by people in the US. When all is added
together the difference in taxes between Canada and the higher taxed
US states is not as wide as what many people believe.