Credit Card Minimum Payment Trap Calculator NZ
Paying only the minimum on a credit card is one of the most expensive habits in personal finance, and it is designed to be. This New Zealand calculator shows you exactly how deep the minimum payment trap runs: how many years it takes to clear your card if you pay only the minimum each month, and how much interest you hand over along the way. The trap works because the minimum is set as a small percentage of what you owe, so as your balance falls the required payment falls with it. Each month a larger share of your payment is swallowed by interest and less chips away at the actual debt, which is why a few thousand dollars can take well over a decade to repay and cost you roughly as much again in interest. Enter your current balance, your card's annual interest rate, and the minimum payment rule from your statement, usually the greater of a fixed dollar amount or a percentage of the balance. The calculator runs the numbers month by month and tells you the payoff time and the total interest. It then compares that against paying a fixed amount every month, the single most effective way to escape the trap, so you can see in dollars and years what holding your payment steady actually saves. Use it to set a realistic payoff plan, to decide whether a balance transfer or a lower-rate personal loan is worth it, or simply to see the true cost of the minimum. Results are estimates based on your inputs and a constant interest rate, and are not financial advice.
Only the minimum
Fixed $200 a month
Assumes no new spending and a constant interest rate, interest charged monthly on the balance. The minimum each month is the greater of the percentage and the dollar floor. Estimate only, not financial advice.
How it works
Each month the calculator adds interest to your balance at one twelfth of the annual rate, then subtracts that month's payment. For the minimum-only path, the payment is the greater of the percentage of the balance and the dollar floor, recalculated every month as the balance shrinks. For the fixed path, the same amount is paid every month until the card is clear. The loop repeats until the balance reaches zero, counting the months and adding up the interest.
Worked example
On a $5,000 balance at 19.95% with a minimum of the greater of 2% or $10, the first minimum is about $100 but it falls every month, so the card takes roughly 60 years to clear and costs over $20,000 in interest. Switch to a fixed $200 a month and the same debt is gone in under three years, saving around $19,000 in interest. Holding the payment steady is what breaks the trap.
Related calculators
- Credit Card Interest Calculator: interest on a balance.
- Revolving Credit Calculator: revolving home loan credit.
- Debt Snowball Calculator: clear debts smallest first.
- Debt Avalanche Calculator: clear highest-rate debts first.
- Credit Card Minimum Payments: background on this topic.
- Amortisation Calculator NZ: Loan Repayments and Interest Split.