Two coverages, two different kinds of damage
The first thing to know is that neither coverage is about injuries or damage to someone else. Those fall under other parts of your policy, such as liability and accident benefits. Collision and comprehensive are both about damage to your own vehicle. The difference is what caused the damage.
What collision covers
Collision coverage responds when your vehicle is damaged in a collision with another vehicle or an object. Backing into a pole in a parking lot, sliding into a guardrail on a snowy road, or hitting another car are the classic collision claims. In Ontario, there is an important wrinkle: if you are not at fault for a crash with another insured vehicle, your damage is usually handled through direct compensation property damage, known as DCPD, rather than collision. Collision typically comes into play when you are at fault, when fault cannot be determined, or when you hit an object rather than another vehicle.
What comprehensive covers
Comprehensive coverage responds to damage that is not a collision at all. Theft, attempted theft, fire, vandalism, falling objects, and weather damage usually fall here. So does a cracked windshield from a stone on the highway, a dented roof from a fallen branch, and damage from hitting an animal. If you have ever wondered whether a deer strike counts as a collision, the answer is usually no: animal strikes are typically handled under comprehensive, not collision.
That split leads to a common surprise. A driver who carries only collision coverage may assume a broken windshield or a stolen vehicle is covered, when in fact those claims usually belong to comprehensive. Conversely, a driver who carries only comprehensive may be unprotected after an at-fault crash. The two coverages are complements, not substitutes, and many Ontario drivers carry both.
How deductibles work
Both coverages come with a deductible, and the deductible works the same way for each. If your deductible is 500 dollars and the repair costs 2,000 dollars, you typically pay the first 500 and your insurer pays the remaining 1,500, up to your vehicle's value. Choosing a higher deductible usually lowers your premium, but it also means more out of pocket at claim time. It is worth picking a deductible you could actually pay on short notice, not just the one that gives the lowest premium.
What neither coverage pays for
Neither coverage pays for everything that can go wrong with a vehicle. Wear and tear, rust, mechanical breakdown, and routine maintenance are usually not covered. Personal belongings stolen from inside a vehicle are also usually not an auto claim; that kind of loss often falls under a home or renters policy instead, subject to its own deductible and limits. And neither coverage pays more than your vehicle is worth at the time of the loss, which is why older vehicles sometimes reach a point where dropping one or both coverages starts to make sense.
Are they required in Ontario?
Are collision and comprehensive legally required in Ontario? No. The mandatory parts of an Ontario auto policy are liability, accident benefits, uninsured automobile coverage, and DCPD. Collision and comprehensive are optional. The catch is that if you lease or finance your vehicle, your lender or leasing company will usually require both, and that requirement stays in place until the loan or lease ends. Dropping coverage on a financed vehicle can breach your agreement, so check before making any change.
How to decide what to carry
So how do you decide what to carry? Start with your vehicle's value. On a newer vehicle, or one you still owe money on, both coverages are usually the sensible choice. On an older vehicle with modest value, compare the annual premium for each coverage against what a claim would actually pay after your deductible. If the premium is close to the payout you would receive, the coverage may be doing little work for you. Also consider your own risk: a long highway commute raises the odds of a windshield or animal claim, while street parking in a busy area raises theft and vandalism risk.
Before renewal, take a few minutes to review what you actually carry. Ask your broker which coverages are on your policy, what your deductibles are, and whether your vehicle's value still justifies both. A short conversation at renewal time is far better than discovering a gap after a claim.
The bottom line
Collision covers damage from a crash with another vehicle or an object. Comprehensive covers the rest of the ways a vehicle gets damaged: theft, fire, vandalism, weather, falling objects, and animal strikes. Neither is legally required in Ontario, but both are usually required while a vehicle is leased or financed, and both come with a deductible you pay first. Knowing which one responds to which loss is the difference between a claim that pays out and a surprise at the worst possible moment.