What Is APR? The Number That Makes Loans Comparable

APR is the annual percentage rate: the yearly cost of borrowing, including interest and certain fees. It is the fairest way to compare two loan offers.

By Promissory.ca Editorial Team Reviewed against official Canadian sources Last updated: 2026-09-16

APR in plain language

APR stands for annual percentage rate. It expresses the cost of borrowing as a percentage over a year, and it includes the interest rate plus certain fees that a lender charges. In effect, it answers a simple question: if you held this loan for a year, what would it cost you, all in?

That makes APR a more complete measure than the interest rate alone. Two loans can advertise the same rate and still cost different amounts once fees are counted. The APR is designed to expose that difference so you can compare offers on equal footing.

APR vs interest rate

The interest rate is the price a lender charges for the use of the principal. It is the core of the cost, but it is not the whole cost. Fees such as an origination or administration charge add to what you pay, and those fees do not show up in the rate.

APR takes the interest rate and folds in those fees, spreading the total across the year. The result is usually a little higher than the stated interest rate, and the gap tells you how much the fees are adding. When you compare offers, the one with the lower APR is generally the cheaper loan, even if its headline rate looks higher.

What APR includes and what it does not

That distinction matters. A loan with a low APR can still be expensive if you miss payments or add optional products. The APR compares the base cost of the loan, not every possible outcome.

Why APR is the better comparison tool

Imagine two offers. One advertises a lower rate but charges an upfront fee. The other advertises a slightly higher rate with no fee. Which is cheaper? The rate alone cannot tell you, because it ignores the fee. The APR can, because it includes both.

This is why consumer guidance in Canada points borrowers toward the total cost of credit rather than the advertised rate. The rate is a starting point; the APR is the number you compare. When a lender quotes a rate without mentioning fees, ask for the APR.

The legal ceiling on the cost of credit

Canada does not allow unlimited charges. The Criminal Code sets the criminal rate of interest at 35% APR, reduced from 48% on 1 January 2025. A lender cannot charge more than that, and interest above the limit is not enforceable. The ceiling is expressed as an APR, which is one reason the APR concept matters legally as well as practically.

Within the ceiling, the APR you are offered depends on your credit history, your income, the term, whether the loan is secured, and the lender. A stronger borrower generally sees a lower APR. That is the market working, not a guarantee, since each lender prices differently.

APR and payday loans

Payday loans are the clearest illustration of why APR exists. These are short-term advances that charge a flat fee rather than an annual rate on a declining balance. Where a provincial regime exists, the cost is capped at $14 per $100 borrowed, the dishonoured-payment fee is capped at $20, and the maximum payday loan is $1,500.

Expressed over a year, that flat fee becomes enormous. The federal consumer agency illustrates this with a scenario in which $500 borrowed for 14 days costs $70, which works out to roughly 365% on an annual basis. That is not a rate the lender advertises; it is the APR equivalent, and it shows why a payday loan is a very costly way to borrow when other options exist.

Where APR has limits

APR is a strong comparison tool, but it is not perfect. It assumes you keep the loan for the full term and make every payment on schedule. If you repay early, the effective cost may be lower than the APR suggests, especially if there is no prepayment penalty. If you stretch the term or miss payments, the real cost may be higher.

The APR also does not capture variable rates fully, because a variable loan's future cost depends on rate changes that have not happened yet. Two variable loans with the same starting APR can diverge later. And APR does not tell you whether a loan is affordable; it tells you what it costs.

How to use APR when you shop

1. Ask every lender for the APR in writing. If they quote only a rate, request the APR that includes fees.
2. Compare loans of the same term. A longer term spreads fees differently and can make the APR look smaller.
3. Check what is excluded. Ask about late fees, penalties, and optional products.
4. Confirm the prepayment terms. If you may repay early, a penalty changes the real cost.
5. Use the APR alongside your budget. The cheapest loan you cannot repay is not cheap at all.

Common mistakes

The most common mistake is comparing interest rates across loans with different fee structures, which is exactly what the APR was designed to prevent. The second is ignoring fees that sit outside the APR, such as late charges, which can turn a low-APR loan into an expensive one if you stumble.

A third is treating a low APR as proof of affordability. APR measures cost, not comfort. A loan can have a low APR and still be too large for your budget. Compare the APR to choose the cheaper loan, then compare the payment to your budget to decide whether to borrow at all.