Credit Card Costs in Singapore

A credit card is two products wearing one plastic: a free short-term convenience if you pay in full, and one of the most expensive forms of consumer credit if you do not. The difference between those two products is a single decision made once a month — the paying-in-full decision. This guide explains how card interest and minimum payments actually work in Singapore, and why the minimum is structured the way it is.

Pay in full and the interest never starts

If you repay the entire statement balance by the due date, most cards charge no interest on your purchases — the bank has effectively lent you the money for free between the purchase date and the payment date. Revolve — pay less than the full balance — and the machinery changes character: interest is charged on the outstanding balance, and depending on the issuer's terms it can be charged from the statement or transaction date, wiping out the free-ride period you assumed you had. The grace period is a reward for paying in full, not a permanent feature of the card. This is why the paying-in-full decision matters more than any rewards programme: a month of card-style interest can cost more than a year of points is worth.

The minimum payment: small by design

Card issuers set a minimum monthly payment — commonly a small percentage of the outstanding balance with a floor (the calculator uses a 3%-of-balance minimum with a S$50 floor by default; issuers set their own minimums and change them, so enter your statement's figures for a meaningful simulation). The minimum is calibrated to keep the account current — not to clear it. On an illustrative S$5,000 balance at a 20% annual rate, paying the 3% minimum with its floor takes about eleven years to clear the balance, and the interest paid along the way comes to nearly the original balance again. That is the structure working as designed: a revolving balance the borrower can service indefinitely while it generates revenue indefinitely. The credit card calculator reproduces this simulation exactly — and lets you compare it against fixed instalment amounts, which is the honest alternative view.

Late payments add their own layer: late fees, and late-payment records that issuers report into the credit assessment ecosystem that future lenders consult. A missed minimum is therefore more expensive than its fee — it prices you differently on every future application, including mortgages, where the instalment must fit under the TDSR framework described in the TDSR and MSR guide.

Instalment plans and fees: reading the real rate

Many cards offer conversion of purchases into instalment plans — a monthly fee or flat rate instead of revolving interest. A flat-style quoted rate is not directly comparable with a reducing-balance rate at the same percentage, for the same reason as car loans: the fee is computed on the original amount for the whole plan. The discipline that fixes this is the same everywhere in this guide set: convert to the effective interest rate before comparing. The calculator computes the rate implied by any fee-and-term combination you enter, so a "0.5% per month processing fee" can be checked against a personal loan quote on the same page. For the underlying arithmetic, read the companion guide on flat versus reducing rates.

If the balance is already large

A card balance that only ever meets its minimum is a debt problem wearing a payment schedule, and the answer is structural, not motivational: move it to a term structure where the balance must fall. Options in ascending order of formality: a disciplined payment plan above the minimum targeted at the highest-rate balance; a personal instalment loan at a lower rate than the card; and, where unsecured debt across institutions has grown beyond what the budget can manage, the industry's Debt Consolidation Plan — the guide to the Debt Consolidation Plan in Singapore covers the 12-times-monthly-income reference point and how that framework works. Whatever the route, the inflow side must close with it: the first new charge on a card you are still paying off restarts the problem at card rates.