How to use this calculator
- Enter the amount of tax or credit and the number of days of delay.
- Choose the interest rate for the type of default to match your situation.
- Read the interest and the total payable in the result.
Interest on credit applies only when it was used; confirm the days between the due date and payment.
The result is an estimate for the figures you enter. It is not a filed return, a certificate or professional advice. Rates, thresholds and section numbers change with each Finance Act, and the Income-tax Act, 2025 applies from 1 April 2026 with new section and form numbers.
For the related work, see GST return filing.
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