Depends on the market. I don't live in the Bay Area or NY, but knowing how much I make where I am (plus that of my peers) and similar pay levels in the Toronto

Depends on the market. I don't live in the Bay Area or NY, but knowing how much I make where I am (plus that of my peers) and similar pay levels in the Toronto tech labour market (one of the better ones in Canada), I would probably end up with ~50% of my US compensation in Canada even when assuming 1 USD = 1 CAD. Once you factor in the exchange, it's probably in the low 40s. And that doesn't even account for take-home pay after taxes and the large Canadian urban markets' cost of living, since the tax brackets top out quite a bit lower in Canada (not that I think the higher taxes are a bad thing; I don't feel my taxes in the US are high enough).