Advance Tax Calculator
Instalments, due dates and interest under sections 234B and 234C.
Enter estimated income and what you have paid so far. We will show each instalment, the shortfall, and the interest it attracts.
Four dates, four percentages
15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March — each cumulative, not incremental. A presumptive taxpayer under 44AD or 44ADA pays the whole amount by 15 March instead.
The safe harbour
Section 234C accepts 12% by the first date and 36% by the second in place of 15% and 45%, provided the shortfall did not arise from underestimating. It is a genuine concession, not a rounding tolerance.
234B versus 234C
234C is interest for deferring an instalment — three months per shortfall on the first three dates, one month on the last. 234B is interest for paying less than 90% of the liability by year end, running at 1% a month from 1 April until the tax is paid.
Late capital gains
Where capital gains or lottery income arise after an instalment date, the tax on them is excluded from 234C if paid in the remaining instalments. That protection does not extend to ordinary business income.