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Why credit card debt is harder to escape than it looks (v4)

11 minutes| May 01 2026

By Philippa Billings, Head of Advice, Otivo

Here's a strange thing about the minimum payment on a credit card. It isn't designed to get you out of debt. It's designed to keep your account profitable for the lender while remaining affordable enough that you keep paying it.

Those two goals — affordable and profitable — produce a number that sits perilously close to interest-only. Pay it every month, and your balance barely moves. Pay it for a year, and you might be a few hundred dollars closer to clear. Pay it for a decade, and a $9,000 balance is still well over $7,000. According to ASIC's MoneySmart calculator, paying only the minimum on a typical Australian card balance at 20% interest can keep a borrower in debt for more than thirty years, with the total interest paid eventually exceeding the original balance several times over. Here's why credit card debt is structurally harder to escape than other forms of borrowing, and what actually changes the trajectory.

Quick answer

Credit card debt is structured as revolving credit, meaning interest accrues daily on the outstanding balance and the borrower can repay any amount above a small required minimum each month. Minimum payments are typically set at 2-3% of the balance, an amount calibrated to cover interest plus a small principal reduction — keeping accounts profitable for lenders while remaining affordable for borrowers. As at May 2026, the average Australian credit card interest rate sits around 18-22% per year, and average revolving card balances per household run to around $9,000 across most postcodes.

What's the average credit card debt in Australia?

The figures in this article come from Otivo's analysis of household debt across Australian postcodes. The dataset tracks revolving credit card balances separately from other categories of borrowing — mortgages, unsecured personal loans, "other loans" (mostly car and store finance), and BNPL — which makes it possible to see how card debt varies geographically.

That variation matters because the minimum payment trap behaves very differently at different balance sizes. The national average across Australian postcodes sits around $9,000 in revolving card debt per household. The median is similar. But the range is dramatic. Some regional postcodes show less than $3,000 in average card debt per household. Some inner-urban postcodes — affluent areas in Sydney, Melbourne, Brisbane and Perth — carry $30,000 or more.

The geographic pattern is also instructive. The postcodes carrying the highest credit card balances per household aren't the most financially stressed ones in absolute terms — they're often inner-city areas with high household incomes. That tells you something useful about how the product is being used: not just as emergency credit, but as everyday spending infrastructure that quietly carries a balance.

The reason all of this matters for the rest of this article is that "$9,000 at 20%" is the realistic starting point for thinking about how the minimum payment trap works for most Australians. Plugging the real numbers into the maths makes the trap a lot more vivid than the abstract version.

How credit card interest actually works

Credit cards don't charge interest the way a typical loan does. There's no fixed term, no scheduled repayment amount, and no automatic principal reduction. Instead, the card has a credit limit, and the borrower can use, repay, and re-borrow up to that limit indefinitely.

Interest is calculated daily on the outstanding balance and added to the account monthly. For purchases, most cards have an interest-free period — typically up to 55 days — but only if the previous statement balance was paid in full. The moment a balance carries over, the interest-free period ends, and interest accrues from the date of each new purchase.

This is the first source of confusion. Many cardholders assume that as long as they're making the minimum payment, they're still benefiting from the interest-free period. They aren't. Once a balance rolls over, every new purchase starts accruing interest immediately, and that interest compounds against the entire balance.

Why minimum payments keep you in debt

The minimum payment on most Australian credit cards is set at the higher of a fixed dollar amount (often $20-25) or a small percentage of the outstanding balance (usually 2-3%).

Here's why that's a trap, using the typical Australian household's revolving balance. At a 20% annual interest rate, monthly interest on a $9,000 balance comes to roughly $150. A 2.5% minimum payment on the same balance is $225. So out of the $225 minimum payment, $150 covers interest, and only $75 reduces the principal. The principal moves from $9,000 to $8,925 — and next month's interest is calculated on the slightly smaller balance, producing a barely smaller minimum, and a barely smaller principal reduction.

The repayment curve isn't a straight line down. It's an almost-flat line that bends slowly toward zero, taking decades to get there. ASIC's MoneySmart credit card calculator shows that paying only the minimum on a $9,000 credit card debt at 20% interest can take more than 30 years to clear, with total interest paid exceeding the original balance several times over. In the inner-city postcodes where average card balances top $30,000 per household, the picture is even starker.

The minimum payment trap in numbers

Three quick scenarios on a $9,000 starting balance at 20% interest illustrate the point.

Scenario one: minimum payment only (around $225 in month one, falling slowly from there). The balance clears in roughly 30-plus years. Total interest paid is several times the original $9,000.

Scenario two: fixed $300 per month, regardless of how the balance reduces. The balance clears in about 41 months. Total interest is in the order of $3,300.

Scenario three: fixed $400 per month, regardless of how the balance reduces. The balance clears in about 28 months. Total interest is in the order of $2,000.

The difference between scenario one and scenario two isn't huge in monthly cash flow — about $75-100 more per month than the minimum — but the difference in outcome is enormous. The mechanic at work is the fixed-payment approach: by paying a flat amount regardless of how the minimum drops, every dollar of principal reduction frees up more of the next payment to attack the principal.

Why the credit card balance "doesn't seem to move"

This is one of the most common observations from people working through a credit card balance: they've been paying every month for a year, and the balance has barely shifted.

In most cases, two things are happening. The first is the minimum-payment dynamic above — most of each payment is being absorbed by interest, leaving very little for principal reduction. The second is continued use of the card. Even modest new purchases — a $40 dinner, a $90 utility bill paid by card — add to the balance at roughly the same rate that minimum payments are reducing it. The net movement is close to zero.

This second factor is often the bigger one. A card that's being paid down and used simultaneously is essentially being held at its current balance, with interest charges added on top each month. The trajectory only shifts when either the new spending stops, or the repayments rise meaningfully above the minimum.

The postcode-level data makes this concrete. The postcodes carrying the highest credit card balances per household aren't necessarily the most financially stressed in absolute terms — many are inner-urban areas with high household incomes. What they share is a usage pattern: cards being used as everyday spending instruments while also carrying balances, with the minimum-payment dynamic doing the rest.

What actually changes the trajectory

Three levers tend to make the biggest difference, often in combination.

The first is converting from a minimum-payment habit to a fixed-amount habit. Setting a repayment amount that doesn't move as the balance falls — even a modest one above the minimum — changes the curve of repayment fundamentally. The same monthly cost, applied as a flat amount rather than a percentage of balance, can shave decades off the repayment period.

The second is interrupting the cycle of continued use while paying down. This doesn't require closing the account — many people leave the card open but physically remove it from their wallet during the repayment period, removing the friction-free path to new purchases.

The third is restructuring. A balance transfer to a card with a 0% promotional rate for 12-24 months can route every dollar of repayment to principal during the promotional period. A personal loan at a lower fixed rate can replace the revolving structure with a fixed-term repayment schedule. Both come with conditions worth checking, but for borrowers carrying meaningful credit card balances, the restructuring options often save more than the behavioural changes alone.

Frequently asked questions

Is closing a credit card the best way to stop using it?

Not always. Closing a card removes the credit limit from a credit profile, which can affect the credit utilisation ratio used by credit scoring models. For many borrowers, the more useful step is keeping the card open but freezing it — removing the card from digital wallets, storing the physical card somewhere inconvenient, and not relying on it for everyday spending while the balance is paid down.

Is a balance transfer worth it?

Often, but with caveats. The promotional rate (frequently 0% for a fixed period) only applies to the transferred balance, not new purchases on the same card. If the transferred balance isn't cleared by the end of the promotional period, the rate typically reverts to a high purchase rate. Transfer fees of 1-3% are common. The maths works when the borrower has a realistic plan to clear most of the transferred balance during the promotional window.

Will paying off a credit card improve my credit score?

Generally, yes — although the size and timing of the impact varies. Paying down credit card balances reduces the credit utilisation ratio (the proportion of available credit being used), which is one of the factors credit scoring models weight. The exact effect depends on the credit bureau, the scoring model, and the rest of the credit profile.

Where to from here

Credit card debt doesn't unwind on its own, and minimum payments are calibrated to make sure it doesn't. The path out usually starts with a clearer view of the actual balance, the actual interest rate, and the actual monthly cost — followed by a decision about whether to attack the balance directly, restructure it into a different facility, or some combination of both. Otivo's debt advice module — provided under AFSL and Australian Credit Licence No. 485665 — is designed to model these options and surface the one that best fits a household's circumstances.

Sources

Disclaimer

The information in this communication is current as at May 2026 and has been prepared by Otivo Pty Ltd ABN 47 602 457 732, AFSL and Australian Credit Licence No. 485665. This content is general information only and has been prepared without taking into account your objectives, financial situation or needs. It is not personal financial or taxation advice and should not be relied on as such. Before acting on any information, you should consider its appropriateness having regard to your personal circumstances. This material must not be reproduced in whole or in part, or posted on any social media platform, without the prior written consent of Otivo Pty Ltd.

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