How Banks Work: Profit, Fees, and Your Money

Banks Are Businesses First

When you deposit money into your bank account, it might feel like you are putting cash into a safe. In reality, your deposit becomes raw material for one of the most profitable business models in the world. Understanding how banks make money is essential because their profit motives directly shape the products they offer you, the fees they charge, and the interest rates they pay — or do not pay.

Canadian banks are among the most profitable in the world. The Big Five — RBC, TD, Scotiabank, BMO, and CIBC — consistently rank among the top banks globally by profitability. In a typical year, they collectively earn tens of billions of dollars in profit. Understanding where that money comes from helps you make better decisions about where to keep yours.

The Core Business: Borrowing Low, Lending High

The fundamental business of banking is deceptively simple. A bank borrows money at a low interest rate and lends it out at a higher rate. The difference between these two rates is the net interest margin, and it is the engine that drives bank profitability.

Here is how this works in practice. You deposit $10,000 into a savings account. The bank pays you perhaps 0.5% interest — $50 per year. The bank then lends that $10,000 to someone buying a home at 5.5% interest — $550 per year. The bank keeps the $500 difference. Multiply this across millions of depositors and borrowers, and you begin to see how banks generate billions.

This spread exists because banks are performing a valuable service: maturity transformation. You want your savings available on demand (short-term), while borrowers want loans that last 25 years (long-term). Banks bridge this gap, accepting the risk that not all borrowers will repay. This is genuinely useful — without banks, it would be extremely difficult for individuals to get mortgages or for businesses to fund expansion.

How the Prime Rate Affects You

Canadian banks set their prime rate based on the Bank of Canada’s overnight rate. When the Bank of Canada changes the overnight rate, banks typically adjust their prime rate by the same amount within days. As of early 2026, if the overnight rate is around 3%, the prime rate would typically be about 5.2%.

The prime rate matters because many loans are priced relative to it. A line of credit might charge “prime plus 1%.” A variable-rate mortgage might charge “prime minus 0.5%.” When the Bank of Canada raises the overnight rate, your variable borrowing costs go up, sometimes significantly. A 2% rate increase on a $400,000 variable-rate mortgage adds roughly $500 to your monthly payment.

Fee Income: The Second Revenue Stream

Beyond interest, Canadian banks earn substantial revenue from fees. Some of these fees are transparent and reasonable. Others are designed to catch you off guard.

Common Bank Fees in Canada

Monthly account fees. Many Canadian chequing accounts charge $4 to $30 per month unless you maintain a minimum balance (often $3,000 to $5,000). This is effectively a tax on having less money — the less you have, the more you pay.

ATM fees. Using another bank’s ATM typically costs $1.50 to $3.00 from your bank, plus another $1.50 to $3.00 from the ATM owner. A single withdrawal can cost $5 or more. Over a year of weekly withdrawals, that is $260 — real money.

Overdraft fees. If your account goes below zero, banks charge overdraft interest (often 21% annualized) plus a flat fee of $5 per transaction. Some Canadians pay hundreds of dollars per year in overdraft charges.

NSF (Non-Sufficient Funds) fees. If a pre-authorized payment or cheque bounces because your account lacks funds, the bank charges $45 to $48 per occurrence. The payee may also charge you a returned payment fee.

Foreign exchange fees. When you make a purchase in a foreign currency (common for online shopping from US retailers), banks and credit card companies typically charge a 2.5% conversion markup on top of the exchange rate.

Wire transfer fees. Sending money internationally through a Canadian bank can cost $20 to $80 per transfer, far more than many specialized transfer services.

How to Minimize Fees

The simplest strategies can save you hundreds per year:

• Maintain the minimum balance for fee waivers, or switch to a no-fee account at a digital bank like Tangerine or Simplii Financial.
• Use Interac e-Transfer instead of wire transfers for domestic payments — most banks now include unlimited e-Transfers with their accounts.
• Use your own bank’s ATMs or get a no-fee account that reimburses ATM charges.
• Get a no-foreign-exchange-fee credit card like the Scotiabank Passport Visa Infinite or Brim Financial if you shop internationally.
• Set up low-balance alerts to avoid overdraft and NSF fees.

Tracking your bank fees is one of the first steps in taking control of your finances. Tools like Finthy can help you categorize and monitor these charges automatically.

Deposit Insurance: Your Safety Net

One of the most important protections for Canadian depositors is CDIC (Canada Deposit Insurance Corporation) insurance. CDIC is a federal Crown corporation that automatically insures eligible deposits at member institutions.

How CDIC Coverage Works

CDIC covers up to $100,000 per depositor per insured category at each member institution. The insured categories are:

• Deposits in your name (joint deposits are a separate category)
• Joint deposits
• TFSA deposits
• RRSP deposits
• RRIF deposits
• Deposits in trust
• Deposits held for paying taxes on mortgaged property

This means you could theoretically have $100,000 in each category at the same bank and have all of it insured — up to $700,000 at a single institution. At a second member institution, you get another full set of coverage.

What CDIC Covers

• Savings accounts
• Chequing accounts
• GICs with terms of five years or less
• Term deposits

What CDIC Does NOT Cover

• Mutual funds and ETFs
• Stocks and bonds
• Cryptocurrency
• GICs with terms longer than five years
• Foreign currency deposits

For most Canadians, CDIC coverage is more than sufficient. If you have more than $100,000 in a single deposit category at one bank, consider spreading it across multiple institutions or categories.

How Banks Use Your Data

Canadian banks collect extensive data on your financial behavior: what you buy, where you shop, when you get paid, how much you save. This data helps them in several ways:

Product targeting. If the bank sees your balance growing, expect offers for investment products. If they see you paying rent, expect mortgage pre-approvals. Banks use your transaction data to market additional products.

Risk assessment. Your banking behavior helps the bank decide whether to approve you for credit and at what rate. Consistent deposits, stable balances, and no overdrafts make you look like a lower-risk borrower.

Fee optimization. Banks know exactly which fees generate the most revenue and how much customers will tolerate before switching. The persistence of high NSF fees ($48 per occurrence) despite near-zero cost to process them reflects this calculation.

Your data is protected under Canadian privacy law (PIPEDA — Personal Information Protection and Electronic Documents Act), which gives you the right to know what data is collected and to request corrections. However, the reality is that maintaining strong security practices with your banking credentials is your first line of defense.

Why Bank Profits Matter to You

Understanding bank profitability is not about begrudging their earnings — it is about recognizing that banks are not charities. They are businesses optimizing for shareholder returns. This means:

• The default savings rate will always be low. Banks profit from the spread, so they have every incentive to pay you as little as possible on deposits. You must actively seek better rates.
• Fee structures are designed to extract revenue. Banks count on customer inertia — most people never switch banks even when better options exist.
• Product recommendations serve the bank first. When a bank advisor suggests an investment product, their employer’s profit margin is part of that recommendation. This is why understanding your own investment options independently matters.

None of this means banks are evil. They provide essential services: safekeeping deposits, facilitating payments, extending credit, and connecting savers with borrowers. But they are not looking out for your best interests — that is your job.

Key Takeaways

• Banks profit primarily from the spread between deposit rates and lending rates, a model called net interest margin.
• The Bank of Canada’s overnight rate drives the prime rate, which affects your variable-rate loans and lines of credit directly.
• Bank fees — monthly charges, ATM fees, overdraft charges, NSF penalties, and foreign exchange markups — can cost hundreds of dollars per year if you are not careful.
• CDIC insures eligible deposits up to $100,000 per category per member institution, providing a critical safety net.
• Banks use your data to market products and assess risk, protected by PIPEDA but driven by profit motives.
• Understanding how banks make money empowers you to negotiate better rates, minimize fees, and avoid products designed to benefit the bank more than you.

In the next lesson, you will learn how Canada’s banking system is structured, who regulates it, and what rights and protections you have as a consumer.