The minimum-payment trap
Why the minimum payment is a debt sentence
South African credit cards have two features that combine into a debt sentence. First, the interest rates sit at the top end of consumer credit — 15–25% APR, with the maximum capped by the National Credit Act. Second, the minimum payment is calculated as a percentage of the outstanding balance, typically 5%. As you pay it down, the minimum shrinks too.
How the maths actually plays out
Take a R20,000 balance at 20% APR. Two scenarios:
- Pay 5% minimum each month. First month’s minimum = R1,000. Interest for that month = R333. So R667 reduces the balance — to R19,333. Next month’s minimum drops to R967 because the balance is smaller. By month 24 you’re paying R650 a month, and the balance is still over R15,000. It takes 12+ years to clear, costing R10,000+ in interest.
- Pay R1,500 fixed every month. Each month R333 covers interest and R1,167 reduces capital — capital reduction is consistent. Balance clears in about 15 months. Total interest paid ≈ R2,500.
Same balance. Same rate. Roughly the same first month’s payment. But the fixed-payment approach costs a quarter of the interest and clears 11 years sooner.
The interest-free period — what it actually is
The 55-day interest-free period that SA cards advertise is real but conditional. It only applies if you pay your statement balance in full by the due date each month. Carry any balance — even R1 — and the interest-free period falls away for all new purchases, which then start accruing interest from the day you make them.
In practice, two states for a credit card:
- Cleared every month — the card is functionally a deferred debit card, no interest cost. Use it like a payment tool.
- Carrying a balance — every purchase compounds the problem. The card is now expensive debt, not a payment method.
There’s no in-between. Either clear it in full or you don’t — and the moment you don’t, you’re in the high-interest mode for everything new on it too.
When a personal loan beats the card
If you’re carrying a credit card balance and have access to a personal loan at a lower rate, the maths almost always favours consolidating. A 14% personal loan over 24 months to clear a R30,000 card balance at 20%: monthly instalment about R1,440, total interest about R4,560. Same R30,000 on the card with R1,440 monthly payments: clears in 28 months, interest about R8,400.
Worth nearly R4,000 in interest. The only condition: the card has to actually stay cleared after you consolidate. Cut it up, freeze it, lock it in a drawer — the loan doesn’t help if you run the balance back up the following year.
Run both sides in the Loan Calculator and this one — compare total interest, decide.
Balance-transfer offers — useful, with conditions
Some SA banks offer reduced-rate or 0% balance transfers for a promotional period (commonly 3–12 months). Done right, they save substantial interest. Done wrong, they cost more than the original card. The rules:
- Read the fine print. Most offers have a transfer fee (typically 1–3% of the balance) — that’s your acquisition cost.
- Know when the promotional rate ends. Diary it. Pay it off fully before that date, or the rate jumps to the standard APR and you’re back where you started.
- Miss a payment and most offers immediately revert to standard APR retroactively. Set up the debit order to pay slightly above the minimum to be safe.
- Don’t use the old card while the transferred balance is on the new one. You’ll just rebuild the debt.