# Credit cards: grace period and the minimum-payment trap > When a credit card costs nothing, how a balance quietly grows, and why paying the minimum can keep a debt alive for years. - Course: [Personal Finance: Budget, Safety Cushion, Debt and Investing](https://productovi.com/courses/personal-finance.md) - Module: What does this debt really cost? - Lesson 10/32, ~18 min - Source: https://productovi.com/courses/personal-finance/credit-cards ## When a card is free **Alex Tutor:** Sam's family money is still on the table, and you keep helping them sort out the card. **Sam:** My colleague says her credit card costs her nothing. Mine costs about 1,500 a month. Same kind of card. What does she know that I don't? **Alex Tutor:** The **grace period**. Purchases repaid in full by the end of it cost no interest. In Ukraine it is often around two months as of 2026, but every card sets its own rules. **Alex Tutor:** The usual catches: it covers purchases, not cash withdrawals or transfers, which are often charged from day one plus a fee. And it needs the full amount repaid, not part of it. **Sofia:** So the colleague uses the card as a short, free loan and clears it every month. > **Exercise:** Which habits keep a credit card **free of interest**? Select all that apply. ## How credit card interest works: how the balance grew **Alex Tutor:** Now Sam's card. In September the bank charged 1,480 of interest at 3.2% a month. Work backwards: what balance does that take? **Sam:** We have used it for a year: a fridge, a holiday, the last days before payday. Then September's gap of 6,558 went on top. **Sofia:** And the 1,480 he paid in September was all interest. Not one hryvnia came off the debt. **Alex Tutor:** Exactly. That is how a card stops being free: a balance carried past the grace period, then interest every month on all of it. > **Exercise:** In September the bank charged Sam **1,480 UAH** of interest at **3.2% a month**. What balance was the interest charged on? ## The minimum payment trap **Alex Tutor:** 46,250 then, plus 6,558: the November statement shows 52,800. Sam's card asks for a **minimum payment** of 3% of the balance but never less than the month's interest. At 3.2% a month, the interest always wins. **Sam:** So the minimum is the interest: 3.2% of 52,800, 1,689.60. And if I pay it on time every month? **Alex Tutor:** Then you are a perfect customer, and in a year the balance is still 52,800. On a card with a 5% minimum it shrinks, slowly: 163 months, almost 14 years, and about 135,000 paid for a 52,800 debt. **Sofia:** Because the minimum shrinks with the balance, so the debt never gets a big hit. > **Exercise:** Sam's balance is 52,800 UAH at 3.2% a month, and his minimum payment equals the month's interest. If he pays only the minimum and spends nothing new, how much **interest does he pay in a year**? ## A fixed payment ends it **Alex Tutor:** The fix is a fixed amount, above the minimum, that never shrinks. Every month the interest falls, so more of the same payment goes to the debt itself. **Sam's card balance under three payment rules** | Months from November 2026 | Minimum (interest only) | 3,000 a month | 4,500 a month | | --- | --- | --- | --- | | 0 | 52800 | 52800 | 52800 | | 3 | 52800 | 48742 | 44096 | | 6 | 52800 | 44281 | 34530 | | 9 | 52800 | 39379 | 24015 | | 12 | 52800 | 33990 | 12459 | | 15 | 52800 | 28068 | 0 | | 18 | 52800 | 21558 | 0 | | 21 | 52800 | 14404 | 0 | | 24 | 52800 | 6540 | 0 | | 27 | 52800 | 0 | 0 | *52,800 UAH at 3.2% a month, no new spending on the card. Balance after each payment, rounded to the hryvnia.* **Alex Tutor:** At 3,000 a month the card is clear in 27 months, with 26,096.96 of interest. At 4,500, in 15 months, with 14,456.60. The bigger payment is 1,500 more a month and ends a year sooner. **Sam:** And all of that only works if we stop adding to the card. **Alex Tutor:** Yes. Every purchase left on the card restarts the clock. The October plan closed the monthly gap; now the card has to stay closed. > **Exercise:** Paying a fixed 3,000 UAH a month clears the card in 27 months with 26,096.96 of interest; 4,500 a month clears it in 15 months with 14,456.60. How much **interest** does the bigger payment save? ## A card rule for Sam **Sofia:** Should Sam cut the card up? **Alex Tutor:** Some people do, and it works for them. Another way: purchases only, each one repaid in full within the grace period, nothing new while the old balance is there. The rule matters more than the plastic. **Sam:** And the payment comes off on payday, like the saving. **Alex Tutor:** Good. A fixed amount, automatic, on the 5th. Lenders' terms differ, so check your own card's contract; this is education, not personal advice. > **Exercise:** **True or false:** if Sam pays only his minimum, which equals the month's interest, and puts nothing new on the card, the balance a year later is still 52,800 UAH. ## Your turn: one rule for the fridge **Sam:** Write it down as one rule, next to the spending plan on the fridge. Something my wife and I both sign up to. **Alex Tutor:** Three parts: how the old balance goes down, what the card may do in the meantime, and what happens once it reaches zero. **Sofia:** With numbers: the amount, the day, and how long it takes. **Alex Tutor:** And the price of doing nothing next to it: 20,275.20 a year for keeping the same debt. That line tends to settle arguments. > **Exercise:** Write Sam a card rule in 2–4 sentences: how the existing 52,800 UAH balance is paid down (amount and day), what the card may and may not be used for until then, and what changes once the balance is zero. Use these numbers: the card charges 3.2% a month; a fixed 3,000 a month clears the balance in 27 months, 4,500 a month in 15. > **Key ideas** > > - A card is free only for purchases repaid **in full** within the **grace period**; cash withdrawals and transfers are often charged from day one. Each card sets its own rules. > - Sam's September interest of 1,480 at 3.2% a month means a balance of 46,250; with September's gap the November balance is **52,800**. > - A **minimum payment** that only covers the interest (1,689.60 a month here) keeps the debt at 52,800 forever: 20,275.20 of interest a year. A 5% minimum takes 163 months and about 135,000. > - A **fixed** payment above the minimum ends the debt: 3,000 a month in 27 months (26,096.96 of interest), 4,500 in 15 months (14,456.60). > - No new spending on the card while a balance remains. Check your card's contract: this is education, not personal advice. **Alex Tutor:** Next: "pay in parts" and microloans, the two places where zero percent hides a price. - Previous lesson: [APR: the real annual cost of a loan](https://productovi.com/courses/personal-finance/real-cost-of-a-loan.md) - Next lesson: [Buy now, pay later and payday loans](https://productovi.com/courses/personal-finance/installments-and-microloans.md) --- Productovi Learning. Free, no sign-up needed to read.