[halostatue]

I’ve seen this said several times—the right way to say it is that the U.S. and Eritrea are the only countries that tax non-resident citizens’ income regardless of the source of that income. There are often tax treaties in place with Western countries that reduce that value to zero based on taxes paid to the country of residence.

Canada will tax non-resident citizens if they have certain ties to Canada (http://www.cra-arc.gc.ca/tx/nnrsdnts/cmmn/rsdncy-eng.html), but only on income generated in Canada.