Oh yeah, I suppose I should point out the legal tax route, if you really, really like paperwork. You have to register as a non-resident self-employed person in the US, get an EIN, then you can pay yourself, you may have to do income tax withholding using form 1040-ES(NR) and declare your pay on Form 1042S. And then file a 1040NR return with Form 8840 to claim the tax treaty exemption if in fact you pay any tax. And use the Canada foreign tax credit to reduce the tax you pay in Canada.
The UK end is much simpler, you need to register as self-employed but if you use the tax treaty filing you are exempt from paying income tax in the UK, essentially. It's like two or three forms to fill in. Think of it as a love letter to HMRC.


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