How Credit Cards Work

Beginner: The Basic Machinery

Borrowing, not spending

A credit card is not your money. When you swipe it, the card issuer pays the store and you owe the issuer. It is a short-term loan every single time you use it.

That is the core idea people forget. Spending on a card is borrowing, and borrowed money has to be paid back.

The credit limit

Your credit limit is the most the issuer will let you borrow on the card at once. Charge up to that limit and the card gets declined until you pay some back.

How much of that limit you use is your utilization, and keeping it low is good both for your budget and generally for your score.

Statement and due date

Roughly once a month, the card closes out a billing cycle and sends you a statement showing what you owe. The due date is when at least a minimum payment is required.

If you pay the full statement balance by the due date, you generally owe no interest. This is the sweet spot: use the card, pay it off, pay nothing extra.

Interest, the price of carrying a balance

If you do not pay the full balance, the leftover amount starts accruing interest, charged at the card's rate. That is how a card gets expensive, and card interest rates tend to be high.

Interest is the price of not paying in full. Avoid it and the card is basically free to use. Carry a balance and it steadily costs you.