You are going to be offered a credit card soon. Maybe you already have one.
The bank will call it a starter card, a student card, or a rewards card. The limit will probably be $500 or $1,000. The offer will seem reasonable. The fine print will mention an interest rate. You will not think much about it.
Here is what the offer will not tell you: $1,000 in credit card debt at 19.99% interest, paid off at the minimum each month, takes over seven years to clear. By the end, you will have paid roughly $700 in interest on top of the $1,000 you borrowed. You borrowed a thousand. You paid back almost two thousand.
Understanding this before you carry a balance for the first time is one of the most useful things you can learn about money.
How Interest Works Against You
Interest is the price of borrowed money. When you borrow $100 and the lender charges 20% per year, you owe $120 at the end of the year. Simple enough.
The problem is compounding. If you only pay a little each month, the interest gets added to your balance. Next month, you are paying interest on a larger number. The month after that, larger still. The balance grows even when you are making payments, because the payments are smaller than the interest being added.
This is the same math that makes investing so powerful over time. When money compounds in your favour, it grows. When debt compounds against you, it grows. Same principle. Opposite direction.
Most Canadian credit cards charge between 19.99% and 22.99% annually. At 20%, a $500 balance you do not pay off costs you $100 a year just in interest. Not a huge amount on its own. But most people do not carry $500. They carry more. And they carry it for years.
The Debt You Will See First
At 16 to 19, a few kinds of debt will show up on your radar.
Buy Now Pay Later. Afterpay, Klarna, and similar apps split purchases into four payments spread over six weeks. They show up at checkout when you are buying clothes, electronics, or gear online. They are easy to click through. The first payment comes immediately; the rest follow automatically.
The danger is not just the fees (though you will pay them if you miss a payment). The bigger danger is the habit. You get used to spending money that is not in your account yet. That habit scales badly when the purchases get bigger.
Credit cards. Banks start offering these at 18. Your first one will probably look like a good deal: low limit, maybe a points program, no annual fee. Credit cards are genuinely useful tools when you use them right. But carry a balance once and you will see how the interest statement looks. A lot of students graduate with several thousand in credit card debt on top of their student loans. It adds up faster than you think.
Student loans. If you go to university or college in Ontario, you will likely encounter OSAP. Government student loans charge lower interest than credit cards, and the government pauses interest while you are still in school. But the balance is real money you owe when you graduate. Read the terms before you sign. Know what the repayment schedule looks like.
Car loans. A $10,000 used car at 8% interest over four years costs you roughly $1,700 extra. That is not a disaster if the car is reliable and you can afford the payments. But some dealers target young buyers with higher rates, and some buyers finance more car than the job requires. Know what you are signing before you sign it.
What Nobody Tells You About Carrying Debt
The financial math is one thing. The other cost is harder to see.
Guys who carry consumer debt often do not tell anyone the real number. Not their parents. Not their girlfriend. Nobody. The balance sits quietly in the background, shaping decisions they do not even notice. They avoid thinking about the future because the debt makes the future feel smaller. They spend on small things because the big picture is too heavy to look at.
That weight is real. And it starts earlier than most people think. A $2,000 balance at 19 can follow someone into their late twenties if they only ever pay minimums. By then it is a problem that reaches beyond the account balance. It affects how you think about your future, what risks you feel you can take, how honest you can be in your closest relationships.
You do not have to learn this one from the inside.
Debt That Makes Sense and Debt That Does Not
Not all debt works the same way. It is worth knowing the difference before you sign anything.
Debt that builds something can make sense. An OSAP loan for a program with a real career on the other side. A small loan to buy equipment for a business you are starting. These have logic behind them. The thing you are paying for is going to generate more value than it costs.
Debt that funds your life right now is the kind to be careful with. Charging things on a credit card you could not afford to buy with cash. Using Buy Now Pay Later on stuff you will not remember by next month. A car loan for a vehicle that costs more than the job actually needs.
The question to ask before you borrow: will this thing be worth more to me than what it costs me to repay? If yes, the debt might make sense. If no, you are borrowing from your future self to spend today.
One Rule That Covers Almost Everything
Never carry a credit card balance.
Use your first credit card the way you use a debit card. Only spend what is already in your account. Pay the full statement every single month without exception. If you cannot pay the full balance, stop using the card until you can.
That is it.
A lot of financial trouble starts with one month of carrying a balance. It gets a little bigger the next month. The minimum payment becomes the normal payment. The balance stops going down. Then it starts going up. Then it is a problem that takes years to fix.
The credit card companies are counting on exactly that sequence of events. That is their business model. You are not being paranoid when you refuse to play along.
If you are 17 or 18 and not confident you will pay it off every month, use a debit card or a prepaid card for now. There is no shame in that. There is only shame in carrying $3,000 in credit card debt at 22 because you did not set a firm rule when you were 18.
Your Next Step
Go to your bank's website and find the interest rate on their student credit card. Then search for a credit card interest calculator. Plug in $1,000 at that rate, minimum payment only, and see how long it takes to pay off.
The number will stay with you.
Then make one decision before you ever carry a balance: you will not do it. Not once. Write it down. Tell someone. Make it a rule before you need it.
The people who stay out of consumer debt are not smarter than the people who fall into it. They made a decision early. Before the card showed up. Before the balance started. Before it felt urgent.
Make yours now, while it is still easy.