Cross province(Ontario incorporated - Quebec) tax rules

[isabel]

I am an independant incorporated IT consultant(ontario incorporated) working in Toronto ...however i am recently in talks for another contract to work in Montrel. This is a US company hiring me to work in Montrel but since it cannot have a contract with my incorporated company so it is engaging their preferred partners in Canada i.e. Canadian agency to have this contract with me. which would pay my ontario incorporated company.

Before i decide to take this up i want to know the tax implications and whether this arrangement will be really worth taking up.

Currently for my incorporation I do the remittance of the monthly payroll taxes and HST/GST quarterly also annually file corporation tax(thru a CA).

For taking up the Montrel contract:
1. Do i have to register my company in Quebec?
2. where do i have to remit the monthly payroll taxes. Can i continue remitting payroll taxes as i am doing so now to CRA.
3. what about Hst/Gst? I am not sure whether i will be paid hst/gst by the canadian agency.
4. What about corporation taxes will i have to file corporation taxes in both ontario and quebec.

Appreciate any guidance on the above.

[JGCA]

THis is not an international tax question, it is merely a question involving an Ontario corp doing business with a Quebec company, makes no difference who owns the Quebec corp, its a simple domestic transaction since you have a C.A. ask him for the answers to this question it has no international yax implications.