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Basics of Interest Rates & Finance Charges

Here's how interest rates and charges are determined...

The fee you pay for the privilege of borrowing money from a lender or creditor is known as the interest rate. It is expressed as an annual percentage and can be calculated in numerous ways. Not only can the interest rate itself be determined through several methods, but the way it is applied to your monthly credit card bill can vary as well. Here's the basics of interest rates and interest charges:

Variable vs. fixed interest rate

These days, most credit cards include variable APRs; meaning the interest rate will change or "vary" as the PRIME RATE (or other indexes) vary. The credit card company adds a "margin" to the index to come up with the variable APR. When the index goes up, so does the credit card rate. Likewise, if the index goes down, your credit card APR does as well.

Fixed rate credit cards, on the other hand, are supposed to stay "fixed". But this isn't necessarily true. The credit card company reserves the right to change your rate at any time. As long as you are given at least 15 days notice, your "fixed" rate could be changed at any time.

To gain the most benefit, choose a variable rate credit card when interest rates are decreasing. As the PRIME RATE falls, so will your APR. But if interest rates are rising, you can try to reduce the impact with a fixed rate card instead. Although your credit card company will probably raise a fixed rate as well, it won't happen immediately and you'll receive notification in advance.

A credit card may have several APRs

Pay close attention to credit card "Terms and Conditions". If you carry a balance from month to month, even a small difference in the APR can have a huge impact on how much you pay over time. Make sure you know how you'll be charged and what you'll be charged for. Here are some things to pay attention to:

Varied APRs: The APRs for cash advances and balance transfers often are higher than the APR for purchases (for example, 14% for purchases, 18% for cash advances, and 19% for balance transfers).

Tiered APRs: Different rates may be applied to different levels of an outstanding credit card balance (for example, 16% on balances of $1–$500 and 17% on balances above $500).

Penalty APRs: Your APR could increase if make a payment late. For example, your card agreement may say, “If payment arrives more than ten days late two times within a six-month period, the penalty rate will apply.”

Introductory APRs: Intro rates are a great way to save on new purchases or balance transfers. These 'teaser' rates are often used to attract new cardholders. 0% intro APR credit cards are among the most popular on our site. But be aware, different rates apply after the introductory rate expires.

Delayed APRs: A different rate may apply in the future. For example, a card may advertise that there is “no interest until next March.” Look for the APR that will be in effect after March.

There are multiple ways to calculate interest charges

Credit card companies use one of several methods to calculate the outstanding balance of your credit card; and thus, your interest charges. The method they use can make a big difference in how much interest you’ll pay over time. It can be calculated:

  • Over one billing cycle or two,
  • Using the adjusted balance, the average daily balance, or the
    previous balance, and
  • Including or excluding new purchases in the balance.

* For more details, see Wiki: Methods for Charging Interest.

Depending on the balance you carry and the timing of your purchases and payments, you’ll have a lower finance charge with one-cycle billing and either:

  • The average daily balance method excluding new purchases,
  • The adjusted balance method, or
  • The previous balance method.

* Be sure to see our complete list of 0% Intro and Low APR Credit Cards >

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