N American example: Canadian living/working in the US, pay the US and state. American living/working in Canada, pay Canada/province and US. Trying to work fro

N American example: Canadian living/working in the US, pay the US and state. American living/working in Canada, pay Canada/province and US. Trying to work from country A and live in country B adds complexity - larger companies probably have a tax nexus, but smaller ones might only deal with contractors so they can offload the costs/hassle. And unless you win the lottery, USians in Canada don’t have to pay the US, really. Just file and summarize your worldwide investments.