How to use this calculator
- Enter the total income, the tax payable, the due date and the actual or expected filing date.
- Choose the income band and the number of days of delay to match your situation.
- Read the fee, the interest for delay and the total extra cost in the result.
The fee depends on the total income; also check the interest on unpaid tax and the last date allowed for a belated return.
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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