Income tax load in Canada is pretty close to California / NYC, but your also paying for health insurance on top of the tax load. So living in Canada is cheaper than the USA for healthcare costs if your paying similar tax rates.
It only starts becoming an extra cost if you live in an area of the USA with lower taxes than Canada, and you have to add a $9k credit for the Canadian side to account for the out of pocket healthcare expense they would be paying for in the USA.
https://www.cnbc.com/2017/06/23/heres-how-much-the-average-a...
We spend a little more than $10k USD on medical expenses or $13k CAD.
https://www.fraserinstitute.org/sites/default/files/price-of...
Around $120k CAD is the tipping point where you spend more than the average person in the US which is about $95k USD.