What is a credit card?
A credit card lets you borrow money from a bank or issuer, up to a set limit, to make purchases now and pay the issuer back later. It's fundamentally different from a debit card, which spends money you already have in your bank account, a credit card spends money the issuer is lending you, which you're contractually obligated to repay, usually with interest if you don't pay the full balance each month.
A worked example
If your credit card has a $2,000 limit and you spend $300 on it this month, you now owe the issuer $300. If you pay that $300 back in full by the due date, you typically pay no interest at all. If you only pay $50 toward it, the remaining $250 usually starts accruing interest, often at a significantly higher rate than most other forms of borrowing.
Key takeaways
- A credit card is borrowed money, not your own money, unlike a debit card.
- Paying the full balance every month is the difference between using credit for free and paying real interest.
- Your credit limit is the maximum you can borrow, not a target to spend up to.
Common mistakes
- Treating a credit card like free extra income rather than borrowed money that must be repaid.
- Confusing a credit card with a debit card and assuming there's no real cost to carrying a balance.
- Spending up toward the full credit limit as if it were a savings account balance.
Test yourself
1. What is a credit card, fundamentally?
- Your own money in a special account
- Borrowed money you owe back to the issuer
- A gift from the bank
- A type of debit card
Answer: Borrowed money you owe back to the issuer. A credit card is a line of borrowed credit, not your own funds, every purchase is a small loan you must repay.
2. What typically happens if you don't pay the full balance by the due date?
- Nothing, it carries over for free
- The remaining balance usually starts accruing interest
- The card is cancelled automatically
- You get extra credit limit
Answer: The remaining balance usually starts accruing interest. Unpaid balances typically accrue interest, often at a higher rate than most other borrowing.
3. What is a credit limit?
- The amount you must spend each month
- The maximum amount you're allowed to borrow on the card
- A savings goal
- A tax bracket
Answer: The maximum amount you're allowed to borrow on the card. The credit limit is a ceiling on how much you can borrow, not a spending target.
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Sources and further reading
- CFPB: Consumer tools for credit cards
- MoneyHelper (UK): free, impartial money guidance
- FCA (UK): Consumer information