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Credit card interest is among the most expensive borrowing most people ever use. Rates on unpaid balances commonly run above 20% a year in the US, according to Federal Reserve data, and often well above 30% a year on Indian cards, so the value of any card's rewards disappears quickly if you carry a balance.

Used carefully, though, a card that matches your spending can return a real share of it as rewards and benefits. This category covers credit cards and card comparison services, from HDFC, SBI, ICICI Bank, Axis Bank, Kotak, IDFC, IndusInd, AU Bank, HSBC and Standard Chartered to newer card issuers such as Scapia and UNI Cards, comparison sites such as Credilio, and credit building services such as Kikoff.

This guide explains how cards work and is not financial advice. Investing is in Investing & Trading, and cover in Insurance.

What this category covers

Type	Examples here	What to check
Bank credit cards	HDFC, SBI, ICICI Bank, Axis Bank, Kotak, HSBC	Fees and reward rate
New age card issuers	Scapia Credit Card, UNI Cards, IDFC	App features and forex markup
Card comparison	Credilio, Bajaj Finserv	How recommendations are made
Credit building	Kikoff	Reporting to credit bureaus

Pay in full to make rewards worth it

Paying the full statement balance by the due date avoids interest on purchases during the interest free period. Paying only the minimum due keeps the account in good standing, but interest then applies to the remaining balance, and in many cases to new purchases too.

Set up automatic payment of the full balance where possible. A single late payment can bring fees and hurt your credit score.

Choosing a card for your spending

Cashback cards return a percentage of spending, often higher in specific categories such as online shopping or groceries. Travel cards earn points or miles, and may include airport lounge access and lower foreign exchange markups.

List where you spend most each month, then compare what each card would return on that pattern. A card with a big welcome offer but poor ongoing rewards may not suit you long term.

Annual fees and waivers

Many cards charge an annual fee that is waived if you spend above a set amount in a year. Premium cards with high fees can still be worth it for frequent travelers who use the benefits, and a poor deal for anyone who does not.

Understanding reward points

Points are worth different amounts depending on how you redeem them, from statement credit to flights and vouchers. Check the value per point for the redemptions you will use, and watch for expiry dates and redemption fees.

Banks change reward rules regularly, often excluding categories such as rent, fuel or wallet loads. Check the latest terms rather than relying on older reviews.

Using cards abroad

Most cards add a foreign currency markup to overseas and international online purchases. Cards built for travel, such as Scapia, advertise low or zero markups, which saves a noticeable amount on a trip.

When a shop abroad offers to charge in your home currency, decline and pay in the local currency. The shop's conversion rate is usually worse.

How cards affect your credit score

Payment history and how much of your credit limit you use are major parts of most credit scores. Keeping balances well below the limit and paying on time helps, while applying for many cards in a short time can lower your score temporarily.

Credit building services such as Kikoff report small, regular payments to credit bureaus, which helps people with little credit history.

Card security

Set spending limits and turn off international or online use in your card app when you do not need it. Never share your card number, OTP or PIN with anyone who contacts you, even if they claim to be your bank.

Report a lost card or unfamiliar transaction immediately. Most issuers limit your liability for fraud reported promptly.

EMI and buy now pay later

Converting a purchase into EMIs spreads the cost but often adds interest or a processing fee, even on "no cost EMI" offers where the discount covers the interest. Compare the total you pay with paying upfront.

Lifetime free or paid card?

Lifetime free cards charge no annual fee, which suits people who spend modestly or want a backup card. Paid cards usually offer higher reward rates and extra benefits, so compare the fee against the rewards you would realistically earn in a year.

Closing a card

Closing an old card can reduce your total available credit and the average age of your accounts. If a card has no annual fee, keeping it open and using it occasionally is often better for your score.

Making a card offer go further

Card offers include welcome bonuses, discounts at partner stores and bank offers on big shopping days. Use them only on spending you would do anyway, and pay the balance in full so interest never cancels out the saving.