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Credit 101: What is APR and why does it matter? | Loans and debt | Financial Literacy | Khan Academy


3m read
·Nov 10, 2024

Let's talk a little bit about credit, in particular how much you pay for credit.

So just as a reminder, credit is essentially the ability, or when you actually borrow from someone else. It could take the form of a mortgage, where you say you're borrowing money to buy a house, or it could take the form of a credit card, where when you purchase things with that credit card, you are borrowing money from the bank issuer in order to purchase whatever you want.

Now, credit can be useful; it could be convenient in the case of a credit card, where you don't have to carry cash around. Some places only accept credit or credit card, and it can help you and sometimes make good investments. For example, if you borrow money in order to make an investment that's going to return more money than you put in, but you have to be careful. There's always some risk involved; that actually could be a good financial decision.

Now we also have to be very, very, very careful, especially if you're using credit to buy something that isn't an investment— that's really just all about consumption. "Hey, there's a new outfit I want; I’m going to use credit for it." Maybe you're using it for the convenience, and you're going to pay off the balance at the end of the month. But if you're using it because you actually don't have the money, that is a bad sign. That is a sign that you are spending more money than you are bringing in, and you're using credit to kind of not notice that.

The reason why that's a big deal is, one, you're spending unsustainably. But the other issue is there's usually a pretty significant cost, especially to credit cards. All credit—someone's going to charge you interest for the amount that you borrow, and there's usually going to be some fees on top of that.

One way to think about the cost of credit, you'll see something called APR— these are annual percentage rates. What they do, in the case of a credit card, is they look at your average daily balance, and they're going to charge a certain amount of interest plus fees on that average daily balance.

Now, if you were to just keep that balance all year, you would actually have to compound that average daily balance by 365 days. But to simplify the calculation, APR just takes how much interest you would pay times 365. So it actually understates a little bit; it's actually the interest plus the fees you would pay as a percentage times 365, which actually understates a little bit what you would pay if you actually had to compound. But it's a good standardized measure of roughly what you're going to pay for a loan.

It's not uncommon for a credit card APR to be in the high teens, or even in the 20s. In some cases I've even seen them in the 30 range. That is a lot of expense to pay to borrow money, especially if you're not using it for investments. Mortgages will also have APRs, although they will be significantly lower, mainly because people lending to you view that as a safer bet from their point of view.

Even when you're using it with a credit for what you think are investments, you have to be very conscientious of risk, because credit is really a way of getting leverage. We can talk more about that in other videos. It can magnify how much you make if, say, the asset increases in value, but it can also magnify how much you lose if the asset decreases in value. We'll talk about that at other times, but generally speaking, be very careful about credit, especially if you're using it to buy, if you're using it to consume versus invest, and look at that APR. It's a standardized way of really getting a sense of how costly that loan is.

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