If you put winter tires on your car this winter, your insurance company owes you a discount. The announcement was made by the Ontario government on October 14, 2015. As of January 1, 2016, all insurance companies operating in Ontario are required to provide a discount to their policyholders using winter tires. The announcement was made by the Ontario government on October 14, 2015. As of January 1, 2016, all insurance companies operating in Ontario are required to provide a discount to their