How is interest calculated on unpaid credit card balance?

Just wondering what and how will be the interest charged on the unpaid credit card balance

When you don’t pay the full outstanding balance on your credit card by the due date, interest is charged on the entire unpaid amount from the date of each transaction, not just from the due date.

The interest is calculated daily using a simple formula:

Interest = Outstanding Amount × (Annual Interest Rate ÷ 365) × Number of Days.

**I am going to use some So please Bare with me **

Details Value
Transaction Date 1st June 2025
Purchase Amount ₹15,000
Payment Due Date 20th June 2025
Amount Paid on Due Date ₹5,000
Unpaid Balance ₹10,000
Annual Interest Rate 42%
Daily Interest Rate 42 ÷ 365 = 0.115% per day
Interest Period 21st June – 30th June (10 days)
Interest Calculation ₹10,000 × 0.115% × 10
Interest Charged ₹115
GST on Interest (18%) ₹20.7
Total Extra Charges ₹135.70

So this is all the math going on BTS,I tried my best to explain this But still if you have some question you can ask me on this finonja community…
Happy swiping :waving_hand::waving_hand: