A man pointing to credit card interest

Credit Card Interest Rates

Learn how credit card interest rates work so you can find a card that suits your needs.

When you use a credit card, you're essentially borrowing money from the account's credit limit. So just like any other loan, interest may be charged on the balance. How and when this interest is charged can have a huge impact on what you'll pay for the use of your credit card.

To make sure your credit card works for you, here you'll find answers to the most common questions about interest, including the different rates that may apply and when it's charged. We also look at how you can compare credit card interest rates and take advantage of interest-free days so you can avoid interest charges.

What are credit card interest rates and how do they work?

Interest rates are a type of fee that's charged when you borrow money. With credit cards, interest rates are calculated as a percentage of your balance and shown as an annual or per annum figure. For example, a card could have an interest rate of 9.99% p.a. (per annum) or 21.99% p.a.

Most credit cards also have different interest rates for different types of transactions, with the most common being a purchase rate and a cash advance rate. You can learn more about different types of interest rates below.

How is credit card interest calculated?

The interest rate on credit cards is normally shown as an annual figure. But most credit card companies calculate interest on a daily basis and then add the charges to your account at the end of each statement period. To determine your credit card interest amount, your daily outstanding balance is multiplied by the daily interest rate on your credit card. These daily calculations are then added together at the end of the statement period to get the total interest due. The daily interest rate is calculated by dividing the APR by 365 days.

Compound interest costs

The way credit card interest is charged is known as "compound interest" because it is calculated daily. This means that you could end up paying interest on your interest charges. The good news is that you can cut down on interest costs any time you make a repayment, because that will also affect the daily interest calculation.

Types of credit card interest rates

ccf-interest-woman-250x250Here are the most common types of interest rates you'll find on credit cards:

  • Purchase interest rate. This is the interest you are charged when you use your credit card for making payments in retail outlets or online.
  • Cash advance interest rate. This is the interest rate you are charged when you use your credit card for withdrawing cash from ATMs or cash equivalent transactions, like buying gift cards or gambling.
  • Balance transfer interest rate. This is the interest rate you are charged when transferring an existing credit card debt to a new card.
  • Promotional interest rate. Many credit card companies offer new customers a promotional interest rates for purchases and/or balance transfers. This promotional interest rate is only available for a limited time, with the standard interest rate applying after that. For example, a card may offer you 0% interest on balance transfers for the first 12 months. If you didn't pay off the balance transfer during the first 12 months, the standard rate for balance transfers would apply to the debt.

Even the smallest difference in credit card interest rates can have a huge impact on your account costs. So when you're looking for a new card, make sure you compare both the standard and promotional interest rates to help you find one that suits your needs.

Comparing credit card interest rates

To show you how important it is to compare interest rates, let’s say you have a balance of $1,000 on a credit card with an interest rate of 20.99% p.a. If you only made monthly payments of $50 on this debt, it would take you around 2 years and to pay off your balance and cost you about $212 in interest.

On a credit card with an interest rate of 15.99% p.a., it would still take around 2 years to pay off your balance but would cost you $153 in interest. That’s a saving of $53 compared to the card with a higher rate, which is basically another monthly repayment. The bigger the difference in rates, the greater these potential savings would be.

What else do I need to know?

As well as interest rates, make sure you consider the following when you're looking for a new credit card:

  • Interest-free days. Many credit cards offer a up to a certain number of interest-free days on purchases when you pay your account balance in full by the due date on your statement. For example, up to 55 days interest-free. This gives you a way to avoid interest charges for spending on your credit card.
  • 0% interest rate offers. If you get a credit card with a promotional 0% interest rate, it may only apply for certain types of transactions. For example, you could get 0% interest on balance transfers for 12 months but still have to pay the standard variable interest rate for purchases. There is also a range of credit cards that offer introductory 0% interest rates on both purchases and balance transfers, although standard rates will apply at the end of the promotional period.
  • Annual fee. Most credit cards charge an annual fee, which could also add to your account balance. Remember to factor this cost in when your comparing credit cards and also when you're budgeting for interest costs and repayments.
  • Other features. Many credit cards offer complimentary extras such as insurance or rewards, which could help offset the cost of the annual fee and interest charges. Just remember to weigh the value of the benefits against potential costs so you can decide if a card is worth it based on your spending habits and goals.

Compare credit cards

If you're looking for a new credit card, you can use our tables to compare your options based on interest rates. Just click on the "Purchase rate" or "Balance transfer rate" column and the table will update to show you cards with the lowest to highest rates.

Rates last updated January 19th, 2018
Name Product Purchase rate (p.a.) Interest Free Period Annual fee Balance transfer rate (p.a.) Product Description
HSBC Low Rate Credit Card
13.25% p.a.
Up to 55 days on purchases
$79 p.a.
0% p.a. for 20 months with 2% balance transfer fee
Add additional cardholders for $0 and pay using Apple Pay. Also enjoy exclusive offers with the home&Away Privilege Program.
St.George Vertigo Platinum - Online Offer
12.74% p.a.
Up to 55 days on purchases
$0 p.a. annual fee for the first year ($99 p.a. thereafter)
0% p.a. for 24 months
Platinum card benefits plus 0% p.a. for 24 months on balance transfers (with no BT fee) and $0 annual fee in the first year. Ends 31 January 2018.
Westpac Low Rate Card - Online Only Balance Transfer Offer
13.49% p.a.
Up to 55 days on purchases
$0 p.a. annual fee for the first year ($59 p.a. thereafter)
0% p.a. for 30 months with 2% balance transfer fee
Take advantage of 0% p.a. for 30 months on balance transfers with a 2% balance transfer fee when you apply online by 28 February 2018.
Virgin Money Low Rate Credit Card
11.99% p.a.
Up to 44 days on purchases
$49 p.a.
0% p.a. for 14 months
Receive a discounted annual fee, $100 cashback when you meet the spend requirement and up to 14 months interest-free on balance transfers.
Virgin Australia Velocity Flyer Card - 0% Interest Offer
0% p.a. for 14 months (reverts to 20.74% p.a.)
Up to 44 days on purchases
$129 p.a.
0% p.a. for 6 months
Until 31 January 2018, save with 0% p.a. on purchases for 14 months. Plus, up to 0.66 Velocity Points per $1 spent.
ANZ Low Rate Platinum
11.49% p.a.
Up to 55 days on purchases
$99 p.a.
0% p.a. for 15 months
Enjoy 0% p.a. on balance transfers for 15 months with no BT fee, combined with platinum card privileges and complimentary insurances.
Bankwest Breeze Classic Mastercard
12.99% p.a.
Up to 55 days on purchases
$79 p.a.
0% p.a. for 24 months with 2% balance transfer fee
Receive a long-term balance transfer offer of 0% p.a. for 24 months, a low ongoing purchase rate and up to 55 interest-free days on purchases.
St.George Amplify Card
19.49% p.a.
Up to 55 days on purchases
$0 p.a. annual fee for the first year ($79 p.a. thereafter)
3% p.a. for 36 months
Take advantage of a 3% p.a. interest rate on balance transfers for 36 months. Plus, a $0 first year annual fee and 1 Amplify Point per $1 spent.
Bankwest Breeze Platinum Mastercard
12.99% p.a.
Up to 55 days on purchases
$99 p.a.
0% p.a. for 24 months with 2% balance transfer fee
Receive a 0% p.a. interest rate on balance transfers for 24 months, complimentary travel insurance and 0% foreign transaction fees.
Bank of Melbourne Vertigo Visa Credit Card
13.24% p.a.
Up to 55 days on purchases
$0 p.a. annual fee for the first year ($55 p.a. thereafter)
0% p.a. for 18 months with 1% balance transfer fee
Save with a $0 first year annual fee and a 0% p.a. for 18 months balance transfer offer. Plus, up to 55 days interest-free on purchases.
Westpac Lite Card
9.90% p.a.
Up to 45 days on purchases
$108 p.a.
Keep credit card costs low with a maximum credit limit of $4,000, a 9.9% p.a. purchase interest rate and no foreign transaction fees.
NAB Low Rate Platinum Card
0% p.a. for 9 months (reverts to 13.99% p.a.)
Up to 55 days on purchases
$100 p.a.
4.99% p.a. for 6 months
A platinum card that offers 0% p.a. for 9 months on purchases. Plus 4.99% p.a. on balance transfers for 6 months.
ANZ Low Rate
12.49% p.a.
Up to 55 days on purchases
$58 p.a.
0% p.a. for 15 months
With a low minimum credit limit of $1,000, this no frills card allows you to add up to 3 additional cardholders for $0 and has Mastercard PayPass.
Bank of Melbourne Vertigo Platinum
12.74% p.a.
Up to 55 days on purchases
$99 p.a.
0% p.a. for 24 months with 1% balance transfer fee
Get a range of complimentary insurance covers, access to a 24/7 concierge and the convenience of Visa payWave contactless technology.
St.George Vertigo Visa
13.24% p.a.
Up to 55 days on purchases
$0 p.a. annual fee for the first year ($55 p.a. thereafter)
0% p.a. for 18 months with 1% balance transfer fee
Save with a $0 first year annual fee and a 0% p.a. for 18 months balance transfer offer. Plus, up to 55 days interest-free on purchases.
American Express Essential Credit Card
14.99% p.a.
Up to 55 days on purchases
$0 p.a.
0% p.a. for 12 months with 3% balance transfer fee
Get Smartphone Screen Insurance of up to $500 when you pay for your phone or contract with this card. Plus, a $0 annual fee for life.
BankSA Vertigo Visa
13.24% p.a.
Up to 55 days on purchases
$0 p.a. annual fee for the first year ($55 p.a. thereafter)
0% p.a. for 18 months with 1% balance transfer fee
A no-frills Visa with the protection of a zero liability policy and a 24/7 fraud monitoring service.
NAB Low Rate Credit Card
0% p.a. for 6 months (reverts to 13.99% p.a.)
Up to 55 days on purchases
$59 p.a.
4.99% p.a. for 6 months
This card offers a low introductory rate of 0% p.a. for 6 months on purchases. Plus 4.99% p.a. on balance transfers for 6 months.

Compare up to 4 providers

When applying for a credit card, it’s important that you read the fine print to understand all the terms and conditions of your agreement. If you don’t take the time to understand the fees and charges associated with using your card, you could end up with a nasty financial surprise in the future. Do your research and read all paperwork thoroughly.

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Credit Card Offers

Important Information*
NAB Premium Card - Exclusive Offer
NAB Premium Card - Exclusive Offer

Interest rate

19.74

Annual fee

90
St.George Vertigo Platinum - Online Offer
St.George Vertigo Platinum - Online Offer

Interest rate

12.74

Annual fee

99
Woolworths Everyday Platinum Credit Card
Woolworths Everyday Platinum Credit Card

Interest rate

19.99

Annual fee

49
Virgin Money Low Rate Credit Card
Virgin Money Low Rate Credit Card

Interest rate

11.99

Annual fee

49

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2 Responses

  1. Default Gravatar
    KaruMay 26, 2013

    I have a Diamond MasterCard. My balance is $2700. I have paid $2500 on due date but charged $160. Is it correct? Why has this happened?

    • Staff
      JacobMay 26, 2013Staff

      Hi Karu. It’s difficult to speculate why you’ve been charged this fee. Best to consult your credit card statement when it next arrives, or you can check your online banking facility to see why you’ve been charged this fee. If you let us know the name of the fee, we can offer some insight into why it has been charged, how to avoid it in the future, and maybe how to dispute it with the lender. Jacob.

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