Credit card interest is one of the most expensive forms of debt in Australia. With average purchase rates around 19.99% p.a., understanding how it works — and how to avoid it — can save you thousands.
Average Credit Card Rates — Australia 2026
How Credit Card Interest Works
Unlike most loans, credit cards charge interest daily on your outstanding balance. If you don’t pay your full statement balance by the due date, interest is charged from the transaction date — not the statement date. This means the interest-free period disappears entirely if you carry any balance.
Daily interest rate = Annual rate ÷ 365. On a $5,000 balance at 19.99%, that’s approximately $2.74 per day — or about $1,000 per year.
Interest-Free Days — How to Use Them
Most credit cards offer up to 44–55 interest-free days on purchases — but only if you pay your full statement balance every month. The moment you carry a balance, you lose the interest-free period on new purchases too. This “interest trap” is how banks make billions from credit cards.
Best Low-Rate Credit Cards — April 2026
| Card | Purchase Rate | Annual Fee | Interest-Free Days |
|---|---|---|---|
| NAB Low Rate Card | 12.99% | $59 | 55 |
| Westpac Low Rate Card | 13.74% | $0 (yr 1) | 55 |
| Commonwealth Bank Low Fee Card | 19.74% | $0 | 55 |
| Latitude 28° Global Card | 21.99% | $0 | No interest-free |
Balance Transfer Cards — Paying Off Existing Debt
If you’re carrying a balance on a high-rate card, a balance transfer can save significant interest. Many cards offer 0% balance transfer for 12–24 months with a transfer fee of 1–3%. On a $10,000 balance at 20%, that’s potentially $2,000 in interest saved.
Important: you must close the old card and pay off the transferred balance before the promotional period ends — or the rate reverts to the standard purchase rate.
The Real Cost of Minimum Repayments
Making minimum repayments on a credit card is one of the most expensive financial mistakes Australians make. On a $5,000 balance at 19.99% with minimum repayments of 2% or $25 (whichever is higher), it would take over 25 years to pay off and cost over $9,000 in interest — nearly double the original debt.
Calculate Personal Loan Repayments
Considering consolidating your credit card debt into a personal loan? See your repayments.
Disclaimer: General information only. Not financial advice. Always consult a licensed professional before making financial decisions.