Credit Card Interest Calculator

Credit cards are convenient when bills are settled in full on or before the due date. However, if you revolve an unpaid balance or pay only the "Minimum Amount Due," credit cards become the most expensive debt product in retail banking. Financing charges in India typically range from 3.0% to 3.75% per month—translating to an annualised rate of 42% to over 51%.

The FinToolkit Credit Card Interest Calculator models daily revolving interest, mandatory 18% GST on finance charges, and partial monthly repayments, revealing the true compounding cost of carrying unpaid balances.

The mechanics of the credit card debt trap

Revolving a credit card balance triggers two severe financial penalties under Indian banking practice:

1. Loss of interest-free grace period: Once you carry forward any balance past your statement due date, the interest-free grace period (typically 20 to 50 days) is immediately suspended. Every new purchase you make on the card begins accruing interest from the exact transaction date.
2. Compounding interest + 18% GST: Finance charges are calculated daily on your average daily balance. In addition, an 18% Goods and Services Tax (GST) is levied on all finance charges and interest fees, compounding your monthly cost even further.

Worked repayment example

Consider revolving an outstanding balance of ₹50,000 at a standard monthly rate of 3.50% (42.0% nominal APR, 51.11% Effective Annual Rate), paying a fixed ₹5,000 per month across 6 months.

Despite paying ₹30,000 in cash, your principal was reduced by only ₹19,532 because over ₹10,469 was consumed by interest and taxes. You still owe ₹30,468 on the card.

Practical steps to escape revolving card debt

• Convert to EMI: Convert your large statement balance into a merchant or balance-conversion EMI at 12% to 16% p.a. using our Credit Card EMI Calculator. This immediately slashes interest rates by more than half.
• Take a personal loan to consolidate: A personal loan at 11% to 14% is far cheaper than paying 42% on credit cards.
• Stop using the card: Do not swipe the card for everyday expenses until the revolving balance is completely settled, preventing fresh transactions from immediately accruing daily interest.

Frequently asked questions

What is the "Minimum Amount Due" (MAD)?

MAD is typically 5% of your total statement balance. Paying MAD prevents late payment fees and avoids an immediate default report to credit bureaus, but the remaining 95% balance continues to accrue interest at 40%+ p.a. Paying only the minimum due can take 10 to 20 years to clear a standard card balance.

How does revolving credit affect my CIBIL score?

Carrying a revolving balance raises your credit utilization ratio above safe 30% thresholds, lowering your credit score even if you pay the minimum due on time every month.

Can an insurer or bank waive credit card interest?

Banks rarely waive interest unless you request a formal debt settlement or hardship restructuring plan, which results in a "Settled" status on your credit bureau report and harms future borrowing ability.

Related borrowing calculators

• Credit Card EMI Calculator — evaluate lower-interest structured repayment options.
• Credit Utilization Ratio Calculator — monitor revolving balances to protect your CIBIL score.
• Personal Loan EMI Calculator — explore debt consolidation loans.
• Emergency Fund Calculator — build liquid reserves to avoid relying on high-interest credit lines.