How to use this calculator
- Enter the tax due, the tax already paid, the original due date and the date of filing.
- Choose the filing period to match your situation.
- Read the additional tax, the fee and the total payable in the result.
An updated return is allowed only in specified situations; check eligibility before you file.
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 Tax audit.
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