Taxes for remote Canadian contractor with occasional travel

[canoook]

I am planning to work for a US firm (without Canadian presence) remotely from Canada, under a TN status.

This contract will require me to travel to the US office for a week to work on-site, every 4-5 weeks, so I'll spend about ~2 months in the US per year.

In this case, would I need to pay US taxes (FICA + State + Federal), even though I don't meet the substantial presence test? Or do I only need to worry about Canadian taxes?

If you've been in a similar situation before, I'd really appreciate your insight!!

[nelsona]

As long as you are a self-employed, you will have no US tax or FICA.
If you are an employee however, paid under W-2, you will have to pay US, state and FICA, which will be then credited on your Cdn return.