For most buyers, a dedicated car loan is the better fit when financing a vehicle you plan to keep for years: the repayment schedule retires the balance and the lender's risk is tied to the car itself. A line of credit tends to suit narrower cases, such as paying off a car you have already funded mostly from savings, or covering a small shortfall you can clear within a defined period. The two products are built differently, and those differences matter more than the rate you are quoted on the day.
How each product is structured
A car loan is an instalment product. You borrow a set amount, agree on a term and a payment schedule, and every payment covers interest plus a slice of principal. When the amortization ends, the balance is zero. Many car loans are secured by the vehicle, which means the lender registers a security interest and can take possession if you default. Unsecured car loans exist, and they are generally priced higher because the lender has no claim on the car.
A line of credit is a revolving facility. You are approved for a limit, draw what you need, and repay on your own schedule, subject to a minimum payment that is often interest only. The balance does not amortize by itself. An unsecured line of credit rests on your creditworthiness alone. A home equity line of credit is secured, but by your home rather than by the car.
That structural difference drives almost everything else: an instalment loan forces repayment over time, while a revolving facility leaves the decision to you.
Cost and repayment side by side
Neither product has one published rate, because pricing depends on the lender, your credit profile, the term, and the general level of interest rates. What you can compare is how each one behaves over time.
| Feature | Car loan | Line of credit |
|---|---|---|
| Rate type | Often fixed for the term; variable-rate car loans exist | Usually variable, tied to the lender's prime rate |
| Repayment | Set schedule of principal and interest that clears the balance | Minimum payment often covers interest only; balance persists |
| Security | Commonly secured by the vehicle through a registered lien | Unsecured, or secured by your home in the case of a HELOC |
| Reusability | Closed once repaid; a new loan is needed for the next car | Revolving; the limit becomes available again as you repay |
| Credit mix | Instalment tradeline with a defined end date | Revolving tradeline; a high balance can raise credit utilization |
| If payments stop | Lender may act on its security, including repossession | Interest keeps accruing, the account is reported, and the limit may be reduced or suspended under the agreement |
Security over the vehicle
Where a car loan is secured, the lender registers a lien against the vehicle. In practice, you generally cannot sell the car without discharging the lien first, your insurer needs to know who holds an interest in the vehicle, and a default can lead to the lender taking the car. Buying used makes a lien search worthwhile: provincial personal property registries exist so a buyer can check whether money is still owed on a vehicle.
An unsecured line of credit leaves the car unencumbered, which is a genuine advantage because you can sell it at any time. The trade-off is that the lender has no claim on anything, so the rate reflects unsecured risk. A home equity line of credit changes the picture entirely: you have swapped a car for your house as collateral, which is a far larger exposure for the same purchase.
Insurance requirements
Auto insurance is regulated provincially, and lender requirements sit on top of those rules. Where a lender holds security over a vehicle, it will typically require comprehensive and collision coverage for the life of the loan and will want to be named on the policy, often as loss payee. Provincial minimum coverage is usually not enough to satisfy a secured lender, because the lender is protecting the value of its collateral rather than your liability exposure.
Some lenders also offer optional creditor's insurance, which pays the balance if the borrower dies or becomes disabled. It is optional and it carries a separate cost.
On the line of credit side, there is normally no vehicle insurance condition attached to the facility, because the car is not collateral. You still have to meet provincial requirements to drive legally. If the car depreciates faster than the balance falls, gap coverage is worth understanding before you decline it, though it is sold by insurers and dealers and its usefulness depends on your circumstances.
The risk of an open facility on a depreciating asset
This is the core of the comparison. A car loses value from the day it is driven off the lot, and a line of credit applies no pressure to repay. Combine the two and the balance can outlast the asset. Make interest-only minimum payments for a few years and the car may be worth far less than what you owe, while the balance itself has barely moved.
Variable pricing makes planning harder. A line of credit rate moves with the lender's prime rate, so your cost changes even when your payment does not, unless you deliberately overpay. Many agreements also allow the lender to reduce, suspend, or call the limit. That clause matters most in exactly the situation where you have just spent the money on a car.
Revolving debt also shapes how other lenders see you. A large line of credit balance can push up your credit utilization, which may weigh on future applications, including a mortgage. An instalment car loan is a fixed obligation with a visible end date, which is easier for you and for a future lender to assess.
When a line of credit still makes sense
There are situations where it does. If you already hold a competitive unsecured line of credit, are buying a modest car, and can clear the balance within a set period, the interest cost can be low and you avoid a lien on the vehicle. Paying for most of the car from savings and drawing a small top-up is another case where a line of credit is simple and cheap.
Costs also vary widely between products for the same short-term need. The Financial Consumer Agency of Canada compares the cost of a $300 loan over 14 days: $42.00 for a payday loan, $7.65 for a credit card cash advance, $7.42 for overdraft protection on a chequing account, and $5.92 for a line of credit. Those figures show how much term and structure affect price. They are not a prediction of what any car purchase will cost.
For context on the outer limit of pricing, the federal criminal rate of interest is 35% APR, in force since 1 January 2025 under the Criminal Interest Rate Regulations (SOR/2024-114). It applies broadly, not only to vehicle financing. On the payday side, the maximum cost of borrowing is $14 per $100 borrowed, advances are capped at $1,500, terms are capped at 62 days, the maximum dishonoured-payment fee is $20, nine provinces operate a payday lending regime, and Quebec effectively prohibits payday loans. None of that makes a payday loan a sensible way to buy a car.
Sources and further reading
- Financial Consumer Agency of Canada: Loans
- Financial Consumer Agency of Canada: Lines of credit
- Financial Consumer Agency of Canada: Payday loans
- Criminal Interest Rate Regulations (SOR/2024-114)
This article was prepared by the Instalment.ca Editorial Team as general information only, not financial, legal, or tax advice; Instalment.ca is a loan matching and comparison service, not a lender.