Start by asking which rule the adjuster matched your crash to
You cannot argue with a decision you have not seen the reasoning for. The Fault Determination Rules are a set of written situations, each with a diagram and a fixed split, and the adjuster picks the one that fits the facts as reported. Ask, by email so there is a record, which rule was applied and what facts led to it. A short reply naming the situation, such as a lane change or a vehicle entering from a parking lot, tells you exactly where the disagreement sits.
Very often the problem is a fact, not the rule. The adjuster may have been told that you were changing lanes when you were driving straight, or that you were moving when you were stopped at the Don Mills light. Fix the fact and the rule can change with it. Arguing that the rule is unfair rarely gets anywhere; showing that a different rule describes what happened often does.
Evidence that moves an adjuster, and evidence that does not
What changes a fault decision is something an adjuster can verify. Your memory of the collision, however clear, is one account against another. A recording, a neutral witness or a police document breaks the tie.
Send everything in one package with your claim number on it, and keep copies. Dashcam files get overwritten quickly on most units, so save the clip to your phone or a computer the same day. If your camera records both directions, a rear clip showing a car closing in at speed is about as clear as evidence gets.
- Dashcam or doorbell-camera video, with the original file and its time stamp.
- Names and phone numbers of independent witnesses, not passengers from your own car.
- The report number from police or the Collision Reporting Centre, and any ticket issued at the scene.
- Photos showing where the cars came to rest, lane markings, signs and skid marks.
- Damage photos that show the point of impact on each vehicle.
What the damage on the car can prove about who hit whom
Body damage tells a story, and adjusters read it. A crease that runs from the back of a rear door forward says the other car was moving faster and came from behind. A front-corner hit on the other vehicle and a mid-door hit on yours suggests they entered your path rather than the reverse. Height and direction of scuffs, paint transfer and which way the sheet metal was pushed all point somewhere.
When we write a repair estimate, our photos record the impact zone in detail, from wide shots to close-ups of transfer and tearing. If you are disputing fault, ask us for those images and the damage description; you can forward them to the adjuster with your package. We do not decide fault and will not write an opinion on it, but documented damage is a fact the adjuster can weigh.
Escalating past the adjuster when the answer stays the same
If the adjuster reviews your evidence and keeps the decision, ask for the file to go to a claims supervisor or manager. Put the request in writing and restate the facts you say were misread. A second reader inside the company can reach a different view, especially when new evidence arrived after the first decision.
Every insurance company in Ontario has a formal complaint process, usually ending with an internal ombudsman or complaints officer who issues a final written position. Once you have that letter, you can take the matter to the General Insurance OmbudService, an independent body for auto, home and business insurance complaints that charges consumers nothing. It reviews whether the company handled your complaint fairly and can make a recommendation. Separately, FSRA, the provincial regulator, takes complaints about market conduct, such as a company ignoring your letters or missing its own complaint steps.
Court is the last step, and it is one to discuss with a lawyer or licensed paralegal before you decide. A property-damage action in Ontario generally has a two-year limitation period, so a dispute that drags on needs a calendar check.
Keeping the repair moving while the fault question is argued
A dispute does not have to leave your car parked. If you carry collision coverage, the repair can be approved and completed under the current finding, and the payment lines are adjusted if the decision changes later. Ask the adjuster how a deductible you paid would be handled should the finding move in your favour, and keep the receipt.
Rental is the piece that bites. A not-at-fault share supports a replacement car under the claim, while an at-fault share depends on OPCF 20 loss-of-use. If you are appealing a finding that leaves you without rental coverage, it is usually cheaper to repair now and keep arguing than to leave the car sitting.
Questions people ask
Is there a deadline to dispute a fault decision?
The rules set no fixed appeal window, but evidence fades and footage is overwritten, so act within days. If the dispute might go to court, the general two-year limitation for property damage in Ontario is the outer date to watch.
The other driver got a ticket. Doesn’t that make them at fault?
It helps, and you should send it in. The adjuster still applies the Fault Determination Rules to how the collision happened, so a ticket supports your version of the facts without automatically setting the split.
Can my broker argue the fault decision for me?
A broker can push the file, request a review and explain the complaint steps, which is useful if you bought through one. The decision itself stays with the insurance company’s claims staff.
Will disputing fault slow down my repair?
Not if you have collision coverage. The car can be repaired under the current finding while the decision is reviewed, and payments are rebalanced if it changes.