Simple explanation
Unlike a debit card, which spends money already in your bank account, a credit card lets you spend the bank's money up to an approved credit limit. Each purchase adds to your outstanding balance, which is billed together at the end of a monthly billing cycle.
Most credit cards offer an interest-free period — often around 20 to 50 days depending on when in the billing cycle a purchase is made — during which no interest is charged if you pay the full outstanding amount by the due date.
If you pay only part of the bill (often shown as the "minimum amount due"), the remaining balance usually starts accumulating interest, often at a notably high monthly rate, until it's fully paid off.
Why does it matter?
Used well, a credit card can be a convenient, interest-free short-term borrowing tool and can help build a credit history that affects your future credit score. Used carelessly — by paying only the minimum due repeatedly — it can lead to a fast-growing, expensive debt due to compounding interest.
Example
You spend ₹20,000 on your credit card during a billing cycle and the due date arrives. If you pay the full ₹20,000 by the due date, you owe no interest. If you pay only the minimum due of, say, ₹1,000, interest starts being charged on the remaining ₹19,000 — often at rates that can work out to well over 30–40% a year if carried for a long time.
Important things to know
- Paying only the "minimum due" keeps your account in good standing but does not stop interest from accumulating on the rest of the balance.
- Cash withdrawals using a credit card usually attract interest and fees from the day of withdrawal, with no interest-free period.
- Your credit limit is decided by the issuing bank based on factors like income and credit history, and can typically be requested for review over time.
- Consistently high usage of your credit limit, even if paid off monthly, can sometimes affect your credit score.
- Most cards charge an annual or joining fee, though some are waived based on spending thresholds — it's worth checking these terms before applying.
Common mistakes
- Believing that paying the "minimum due" avoids interest entirely — it only avoids a late payment penalty, not interest on the remaining balance.
- Using a credit card for cash withdrawals regularly, not realising these come with extra fees and no interest-free period.
- Not checking the billing cycle dates, which can accidentally shorten the interest-free period on new purchases.
- Ignoring the card's annual fee and other charges when deciding if a card is worth keeping.
Frequently asked questions
Is a credit card the same as a loan?
It functions like a flexible, revolving short-term loan — you can borrow, repay and borrow again up to your limit, unlike a typical loan which is a one-time amount repaid over a fixed schedule.
What is the interest-free period?
It's the window between making a purchase and the payment due date during which no interest is charged, provided the full bill is paid on time. It usually only applies if the previous bill was also paid in full.
Does using a credit card help my credit score?
Using it responsibly — spending moderately and paying bills on time and in full — can help build a positive credit history over time.
What happens if I only pay the minimum due every month?
You avoid a late payment mark, but interest keeps accumulating on the unpaid balance, which can grow into a large amount over time due to compounding.