I just plucked this from the Canada Border Services Agency website
BSF5048 Importing a vehicle into Canada
Import duties and taxes
If your vehicle is eligible for importation into Canada according to
both CBSA and Transport Canada requirements, you will have to pay import assessments that may include duty, excise tax and the 6% goods and services tax (GST). Provincial or territorial sales tax may apply when you license your vehicle.
If you import a vehicle from outside Canada into Nova Scotia, New Brunswick or Newfoundland and Labrador, and you paid 6% GST on your importation, you will also have to pay the 8% provincial part of the
harmonized sales tax (HST) when you license your vehicle.
Generally, you do not have to pay duty on a vehicle imported for personal use that was manufactured in the United States, Canada or Mexico; however, the CBSA will assess duty on a vehicle manufactured in a country other than the United States and Mexico. Duty and taxes are assessed on your vehicle's "value for duty." This is a value based on the price you have paid or will pay for the vehicle in Canadian funds before any consideration for a trade-in.
The price paid for a vehicle includes not only the gross price, but also all other amounts such as foreign sales taxes or warranty payments collected by the vendor. Any credit you may receive for a trade-in does not reduce the price that must be declared when the vehicle is imported into Canada.
Example
Gross price of vehicle
(as obtained from the dealer's invoice)$25,000Trade-in allowance$10,000Total payment$15,000
While you may have only paid the total amount of $15,000, the gross price of the vehicle of $25,000 is the value for duty that must be declared to allow for the calculation of any applicable duties and taxes.
If your vehicle has air conditioning, you will have to pay an excise tax of CAN$100. You will have to pay additional excise taxes if your vehicle weighs more than 2,007 kilograms or 4,425 pounds.
The following example shows a breakdown of the customs duties and taxes assessed on a U.S.- manufactured automobile sold for export from the United States to a purchaser in Canada and imported in the 2005 calendar year.
Example
2005 model year automobile
purchase price
(includes state taxes)US$50,000value for duty (price converted to
Canadian currency at current
rate of exchange
($50,000.00 x 1.20*))CAN$60,000Duty at 0% 0 Excise tax on
air conditioner $100 Excise tax on
excess weight 0 over $100 $100value for tax
(value + duty + excise tax)$60,100GST ($60,100 × 6%) $3,606total cost$63,706Total duties and taxes paid to CBSA $3,706
* Example only.