APR is a comparison number, not your total interest bill

APR expresses the annual cost of credit as a percentage and may include applicable borrowing charges. Your total dollars of interest still depend on the amount financed, payment schedule and how long the balance stays outstanding. That is why a lower APR can still produce a larger total borrowing cost when the loan amount is much bigger or the term is much longer.

Compare the complete loan, not one number

Write down the amount financed, APR, term, payment frequency, payment amount, total of payments and any fees. A monthly payment by itself can hide the effect of a longer term. When you compare offers, keep the vehicle price and down payment the same so you can see what the financing itself changes.

Read the disclosure before signing

For loans from federally regulated financial institutions, required disclosures include the annual interest rate, APR when it differs, and other charges that may apply. Vehicle financing can also be subject to provincial or territorial rules, so the contract and disclosure statement are the final source for your deal.

Use DriveMath as a reasonableness check

Enter the amount, rate and term in the car payment calculator. If the estimate is materially different from the payment quoted by the lender, ask what fees, products or timing assumptions are included. A calculator cannot replace the contract, but it can make hidden assumptions easier to spot.

Practical checkUse your own contract, quotes and vehicle-specific numbers.

DriveMath explains the math and helps you compare scenarios. It does not replace lender disclosures, insurance quotes, inspection reports or provincial rules.

Common APR mistakes

Do not compare an APR from one offer with a monthly payment from another. Do not assume that a dealer's interest-rate advertisement applies to every term or borrower. Do not treat APR as the percentage of the vehicle price that you will pay in interest. Interest is generated over time on the outstanding balance, so the term and payment schedule matter. When a fee is part of the cost of borrowing, check the lender disclosure to understand whether and how it is reflected in the APR.

A worked comparison

Imagine two offers financing the same $28,000 balance for 72 months. Offer A has the lower APR. Offer B has a higher APR but is paired with a larger manufacturer rebate that reduces the amount financed. The lower APR is not automatically the cheaper package because the starting principal can be different. Put both complete offers into the payment calculator and compare the total of scheduled payments. The useful comparison is the cost of the transaction you can actually sign, not the advertised rate by itself.

Questions people often ask

What if the advertised rate is 0%?

A promotional 0% rate can reduce borrowing cost, but compare the vehicle price and any incentive you give up to obtain that rate. A cash rebate with a higher rate can sometimes produce a different total cost than 0% financing.

Does APR tell me the monthly payment?

No. APR is one input. Payment also depends on the financed amount, term and payment frequency.

Should I compare dealer financing with my bank?

Yes. FCAC recommends getting quotes from multiple dealers and lenders. Compare the same vehicle price and down payment so the financing difference is visible.

A simple way to use this guide

Write the relevant numbers on one page before you make a decision. Keep the vehicle price, loan terms, insurance quote and expected ownership costs separate. Then change one assumption at a time. This makes it easier to see which part of the deal is actually responsible for a higher or lower total cost.

Sources and further reading

DriveMath uses primary or established Canadian sources for factual claims that can change by law, regulation or market practice.

Put the guide into numbers

Use the calculators to test the price, financing and ownership assumptions that apply to your situation.