Credit Card Interest Calculator
What paying only the minimum due really costs: months to clear the balance, total interest and GST on a revolving credit card balance.
How to use the Credit Card Interest calculator
- Enter outstanding balance, monthly interest rate, monthly payment and minimum due.
- Read the time to clear at the top of the result, with interest paid, gST on interest (18%), total paid underneath. It updates as you type.
- Change one input at a time to see what moves the answer most, then save the result with Copy link or Download PDF.
About this tool
Card interest is charged on the full outstanding amount once you pay less than the total due, and GST is added on top. Paying a fixed amount above the minimum clears the debt far faster.
Worked example
With outstanding balance of ₹1,00,000, monthly interest rate of 3.75% and minimum due of 5%:
| Time to clear | 37 yrs 8 mo |
| Interest paid | ₹4,57,034 |
| GST on interest (18%) | ₹82,266 |
| Total paid | ₹6,39,300 |
Built and reviewed by Savitar Finance (savitarfinance@gmail.com). Rules and rates last checked October 2026. How we calculate · Report a problem
Questions people ask
What happens if I pay only the minimum due on a credit card?
You avoid a late fee, but interest of about 3–3.75% a month plus 18% GST runs on the whole balance, and new purchases lose the interest-free period.
Is GST charged on credit card interest?
Yes, 18% GST applies to interest, late fees and other card charges.