Before you could buy Telsa Model 3 in Canada, there were a number of issues. They were really stupid - Canada rquires the seatbelt release button to be red, wherease originally the Teslas were black. For some models of cars, you needed t buy a different shape of headlight glass to import them, something about beam shape. There was some fine print I vaguely recall about a vehicle having to be 5 years old or older to be imported unless it met certain safety standards. Transport Canada had a big long list on their web page at the time of vehicles and (minor) modifications needed, i assume the USA has similar lists. (Would I be surprised if the USA required all vehicles to do an exhaust emissions test?) I see right-hand-drive and tiny Japanese trucks on the roads occasionally, imported I presume by car enthusiasts.
The problem is, the US auto industry is (was?) incredibly integrated. Parts and assemblies went back and forth across the border, and other parts came from Mexico to USA and Canadian assembly plants. Slapping tariffs on all this made things very complicated and raised the prices of Detroit-mobiles. Which is counterproductive, because the cost of Hyundai’s or Toyotas or BMWs did not change for Canadians. Even Teslas - they could import from the German factory rather than the USA and avoid the counter-tariff.
The purpose of the 100% tariff was to give the big Detroit Two-and-a-half time to adapt to the competition. I’m not sure how long this would need to go on. Canada went along with Biden as a joint effort, due to our American auto plants, before the Trump tariffs. The tariffs was the thanks we got, not to mention coercion to move those plants from Ontario to the USA. (Plus the current administration is not pushing EV’s either) Meanwhile, the Chinese retailiated with high tariffs on assorted Canadian agricultural products, especially canola. So the Canadian logicl was, we owe nothing to the USA any more if they won’t at least let things be.
Besides, nobody makes equivalent entry-level EV’s in Canada.
But to return to the OP’s question - unless they find some excuse to ban the vehicle, then you pay whatever the tariff is to import a Chinese EV - basically, 100%. Then, if the US states are like our provinces, there’s a sales tax on the purchase of the vehicle when you register it. Not sure if it includes a tax on the amount of the import tax…
Presumably for the North American market (i.e. Canada) the charger socket will be NACS compatible, i.e. Tesla plug. I would hope that the chargers, at least the home charger, would compatible with the rest of the market, be no different than any other slow charger. In the end, there’s only one way to find out - wait and see.