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Credit Card Interest Calculator
Result
Chart
Show formula & working
Interest = Unpaid outstanding × (monthly rate × 12 ÷ 365) × days from transaction to the next statement
GST = 18% of interest and fees
If the total due is not paid by the due date, the interest-free period is lost and interest runs from the transaction date on the outstanding amount — not on the total amount due. No interest may be charged on unpaid taxes or charges.Details
RBI rules on credit-card dues: rates and rules as of 01-Oct-2026 · Source: RBI (Commercial Banks – Credit Cards and Debit Cards: Issuance and Conduct) Directions, 2025 (RBI/DOR/2025-26/155, 28 Nov 2025, updated as on 1 October 2026), paragraphs 23(2), 23(5), 23(6) and 12(3); GST: Notification 12/2017-CT(Rate) entry 27(a) excludes credit-card interest from the exemption. Every figure based on it stays editable.
How this works
A credit card is interest-free only if you pay the whole bill by the due date. Pay less — even the minimum — and interest runs from the date of each purchase on the amount left unpaid, plus GST.
A rate of 3.5% a month works out to about 51% a year once compounded — far more than almost any loan.
Frequently asked questions
What is the minimum amount due?
The smallest payment that avoids a late fee. RBI requires it to be set so the balance does not grow from unpaid interest — but paying only the minimum still costs heavy interest.
Does interest apply to new purchases too?
While a balance is carried, new purchases usually lose the interest-free period as well. Pay the full balance to get it back.
Talk to Rytvae
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