TN, Self-employed, W-2, 8233 and taxes fun

Got it.

The situation is really complex (employed by a company, working for a third one), so the employee-employer relationship is unclear, but I'll go on the safe side and just pay the extra taxes.

Actually it's pretty straightforward as you are simply an alien employed by a US company. The only wrinkle is that you are self-employed in Canada, so you can carry on having Canadian clients and doing your own payroll withholding and prepare your own T4, etc. as per usual, the only difference is that you also have an additional source of income which will be on the W-2 they give you and you have to claim a foreign tax credit for it.

But there's no other paperwork on the Canadian end because they've done all the withholding in the US, and your US tax return should be relatively simple if all you have is a W-2 and that's your only US source of income.

I guess the simplest would be to declare non-residency in January, planning on stopping my freelance work anyways.

Less taxes, less paperwork, more fun

Thanks again!

I've put up various threads on here on the problems of moving your tax home to the US, have a search.