Credit card basics · Updated October 2026 · 7 min read
Credit cards are cheap when used well and expensive when used badly. Most of the damage comes from a handful of avoidable mistakes. Here are the ones that cost people the most, and how to avoid each.
In short: Pay the full bill on time, don’t use your card for cash, keep your usage low, read the fees, and protect your card details. These habits prevent most credit card problems.
1. Paying only the minimum due
Paying the minimum keeps you out of default, but the rest of the balance attracts interest, often around 3–4% a month. A small bill can become a large one if you do this repeatedly.
Fix: Pay the total amount due. If you can’t, pay as much as you can above the minimum, and clear the rest quickly. See how credit card interest works.
2. Paying late or forgetting the due date
A late payment can mean a late fee, interest, and a drop in your credit score. Because lenders now report more often, the effect can show up quickly.
Fix: Set up auto-pay for the full amount, or at least the minimum, and add a reminder a few days before the due date.
3. Withdrawing cash
Cash advances usually have a fee, and interest starts straight away, with no interest-free period.
Fix: Avoid it. For emergencies, consider other options first, such as a small personal loan with lower interest.
4. Using too much of your limit
Using most of your limit every month can lower your credit score and makes it easier to slip into debt.
Fix: Keep usage below about 30% of your limit. If you spend a lot, spread spending over more than one card or ask for a limit increase, and pay part of the bill before the statement date.
5. Converting every purchase to EMI without checking the cost
Card EMIs can be useful, but they come with interest, processing fees, and GST, and they use up part of your limit. “No-cost EMI” can still cost you if the discount you would have got is lost.
Fix: Ask for the total amount you will pay, and compare it with the cash price.
6. Not reading the fees and terms
Annual fees, foreign currency markups, add-on card charges, and SMS or other service fees can add up. Rewards that look high may come with caps.
Fix: Read the fee table before you apply and check each statement. See joining fee vs annual fee.
7. Spending more to earn rewards
A 5% cashback on an unneeded purchase is still a 95% loss.
Fix: Buy only what you were going to buy anyway, and choose a card that rewards your normal spending. See cashback vs reward points.
8. Applying for several cards at once
Each application creates a hard enquiry on your credit report. Several in a short period can lower your score, and a rejection leaves an enquiry too. See why applications get rejected.
Fix: Compare eligibility first, apply for one card at a time, and wait for a decision.
9. Closing your oldest card without thinking
Closing a long-standing card can shorten your credit history and reduce your total limit, which raises your usage percentage.
Fix: If a card has no fee, keep it and use it occasionally. If it has a fee and you don’t use it, close it, ideally after paying off any balance.
10. Careless handling of card details and OTPs
Fraud is a real risk. Scammers pretend to be from your bank and ask for your OTP, card number or CVV.
Fix:
- Never share your OTP, PIN, CVV or full card number with anyone, including someone claiming to be from the bank.
- Turn on transaction alerts, and check your statement every month.
- Use the bank’s app or the number on the back of your card to contact them, not numbers from a message or search result.
- If you see a transaction you did not make, call your bank immediately and block the card. Reporting fast matters for your protection under RBI’s rules on unauthorised transactions.
11. Ignoring your statement
Unknown charges, repeated subscriptions, and errors go unnoticed if you don’t look.
Fix: Spend five minutes on each statement. If something is wrong, raise it with the bank. If it is not fixed within 30 days, you can escalate it to the RBI Ombudsman for free.
A simple checklist
- Pay the full bill before the due date, every month.
- Keep usage under about 30% of your limit.
- Avoid cash withdrawals.
- Know your fees, and check them before you apply.
- Apply for new cards rarely.
- Protect your OTP, PIN and CVV.
- Review your statement each month.
Common questions
What should I do if I’m already in credit card debt?
Stop adding new spending on the card, pay more than the minimum, and clear the highest-interest balance first. If you can’t pay, talk to your bank early about repayment options, because it is better than missing payments. Consider a lower-interest personal loan to clear card debt only if you can afford the EMIs. Is it bad to have many credit cards?
Not if you manage them well and pay on time. Many cards make it easy to miss due dates and pay multiple fees. Keep only what you use. Can I get a late fee reversed?
You can ask the bank, especially if it is the first time or a bank error. It is not guaranteed.
Choose a card that fits how you spend: Compare credit cards, including lifetime free options, or review how to improve your CIBIL score.
Cards that make it easy to avoid these mistakes
These cards keep things simple, with low or no fees and clear rewards:
- IDFC FIRST Classic: lifetime free, so you never pay an annual fee.
- SBI Cashback: flat 5% back online, so you do not need to track points.
- HDFC Millennia: cashback on the apps most people already use.
See all 101 cards with fees and eligibility on our credit cards page, or get a personal pick from the Card Finder.
Disclaimer: This guide is for education and is not financial advice. Fees, rates and benefits differ by card and change often, so check your card’s current terms. Some links on Koshfin are affiliate links; we may earn a commission at no extra cost to you.