Isn't the tax tied to number of days stay in Canada e.g. 181. All I did was landing in Canada to complete the process and apply for SIN# and residency card. Do I still have to pay CDN taxes? I don't think so since I haven't established any significant ties in Canada.
There are two types of tax-residents in Canada: factual and deemed.
Whether or not someone is a factual tax-resident is determined by their residential ties. If you establish residential ties in a year you are factual resident from that point onwards. The numebr of days is irrelevant except for apportioning certain tax credits.
If you do not becoma a factual tax-resident in a year, but nevertheless you spend more that 182 days in Canada, you may be deemed to be a tax-resident.