It Isn't Delinquency — and That's Exactly Why the Debt Grows
Card payment day. There isn't enough in the account. Then a notice appears in the card app:
Relief. It isn't a late payment, you can keep using the card, and your credit score stays intact. So most people file it under deferral — pushing this one month back.
It isn't. It's a loan. In Korea its formal name is 일부결제금액이월약정 — literally, "an agreement to carry the unpaid amount into next month" — and the carried amount accrues a fee (interest).
The most dangerous part: it isn't delinquency
Revolving credit's real trap isn't the high rate. It's that it doesn't hurt.
Pay the minimum and you are not recorded as delinquent, not suspended, and your credit score is protected. You keep spending. Every alarm is switched off while the debt quietly grows.
Debt is dangerous precisely because it hurts — and revolving credit removes only the pain. That's how it survives for months, then years.
Let's look at the numbers
Words don't land; math does. Assume a ₩3,000,000 balance, an 18% annual fee rate, paying 10% each month — and never using the card again.
| Point | This month's payment | Of which fee | Remaining balance |
|---|---|---|---|
| Month 1 | ₩300,000 | ₩45,000 | ₩2,745,000 |
| Month 6 | ₩192,410 | ₩28,861 | ₩1,760,548 |
| Month 12 | ₩112,915 | ₩16,937 | ₩1,033,176 |
| Month 24 | ₩38,887 | ₩5,833 | ₩355,818 |
A full year of payments, and ₩3 million fell only to ₩1.03 million — while ₩347,000 went to fees alone.
How long to clear it entirely? About 65 months — five years and five months, with roughly ₩528,000 in total fees. And that's without ever using the card again.
But people keep using the card
That calculation hides one unrealistic assumption: "never use the card again."
So try reality. Same setup, but you spend ₩500,000 more each month.
You paid faithfully every month and the debt grew. That's the true reason revolving credit is dangerous: when you repay only part of the balance while new spending piles on, the balance mathematically cannot shrink.
One more thing: your credit limit restores only by what you actually repay. The rest keeps occupying your limit and generating fees.
How high are the fees?
Disclosed revolving rates generally run from around 5% to nearly 20% a year, varying widely by issuer and personal credit standing. Regulatory tallies have at times put the average in the 14–18% range.
In other words, it can rival or exceed a personal loan. That's an expensive price for "putting it off a little."
And per the terms, on defined triggers — such as delinquency at another financial institution — the fee rate can rise or the minimum payment ratio can increase. Conditions can worsen exactly when you're struggling.
What to do
First, check whether revolving is switched on for your card. This matters most. It's not rare for it to be enabled during card issuance or a promotion without you registering it. In the app or website, find the 일부결제금액이월약정 entry and read your enrollment status and payment ratio yourself.
If you're already using it, in this order:
- Stop new spending. As the math shows, a balance never shrinks while new charges pile on. Use a debit card for a while.
- Raise the payment ratio. From 10% to 30% or 50% — the principal falls faster and total fees drop sharply.
- Check whether a cheaper rate exists. If you can refinance into borrowing that costs less than the revolving rate, total cost can fall. This depends on your situation, so compare the actual numbers.
- Don't tough it out alone if it's unmanageable. In Korea, the FSS call center (☎1332) and public financial-support bodies offer counseling. The earlier you call, the more options remain.
Finally
Using revolving credit isn't foolish. It's a product engineered not to hurt, and anyone reaches for it in a tight month. I won't dismiss the relief it gives.
Just remember this: revolving credit doesn't buy you time — it borrows time. And that time carries a price.
Three lines
- Revolving credit isn't a deferral, it's a loan. Paying the minimum means you're not delinquent — so the debt grows with every alarm switched off.
- At ₩3 million, 18%, 10% payments: ~5 years 5 months to clear, ~₩528,000 in fees. Add ₩500,000 of new spending a month and the balance grows to ₩4.56 million in a year.
- Check whether it's switched on, then: stop new spending → raise the payment ratio → compare cheaper options. If it's too much, call ☎1332.
These calculations are illustrative under the stated assumptions (balance, rate, payment ratio, new spending); actual fee rates, formulas, and minimum ratios differ by issuer and individual. Always check your own terms and your issuer's disclosures. This article is for information only, not financial advice. Last checked: July 2026. If you spot an error, tell me and I'll correct it right away.
Method: monthly fee = balance × annual rate ÷ 12; payment = balance × payment ratio; balance = balance − (payment − fee). A monthly simplification of the disclosed formula (carried balance × rate × days/365).
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