Tax calculators & help centre
GST · Date-based estimate
GST interest calculator
Use a verified interest-bearing amount and period. Standard delayed-tax and wrongly utilised-ITC illustrations both use 18% per year.
EXAMPLE
The working, explained.
Interest period26 day(s)
Annual rate18%
Interest-bearing amount₹1,00,000.00
Estimated interest₹1,282.19
What this result includes
For delayed return tax, establish the legally interest-bearing amount first, including the cash-ledger treatment and Rule 88B conditions. The tool does not infer that amount from total output tax.
Simple interest uses amount × annual rate × elapsed days ÷ 365, excluding the start date and including the end date. Changing balances, multiple utilisation/reversal dates, waivers or litigation need a separate working.
OFFICIAL REFERENCES
Check the source.
Reference review: 15 September 2026. Apply the provisions for your period and facts; notifications and portal requirements can change.