If you initiate the process of cancelling your car insurance, then you may be able to get most, if not all, of your unused premium back. There may be some cancellation fees involved.
There are several reasons why you may choose to cancel an insurance policy early. Maybe you’ve sold your car, or you’re just not driving it much anymore and feel it’s no longer worth insuring (beyond the mandatory CTP insurance required for the vehicle’s registration). Perhaps you found a better deal on car insurance elsewhere and would rather switch insurers now rather than wait for your policy to reach its renewal date.
Keep in mind that you aren’t required to cancel your insurance if you sell one car and buy another - it may be possible to transfer your car insurance policy to a similar new vehicle.
If your insurer cancels your policy, such as if you default on a payment, misrepresent your situation or make a fraudulent claim, then the remainder of your premium could still potentially be refunded to you. However, if you engage in dangerous or illegal activities with your vehicle, the insurer could void your policy, making it so it effectively never existed, so you would receive no refunds. Check with your insurer to learn more about the exact circumstances that could lead them to cancel or void your car insurance policy.