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Ontario Taxes: Contract or Permanent? - contract jobs and taxes in ontario

Hello,

I'm considering a job offer to allow me, a contractor or would be permanent. I have the impression that in recent years, which is more lucrative, the path of the entrepreneur.

First question: which is more lucrative?
Second question: Could he me the details of the taxes to be borne in mind when I negotiate my compensation (eg, GST, federal taxes, provincial taxes, etc..)

Thank you a bunch!