Advance tax & 234B/234C calculator
See your four advance-tax instalments for the year, and estimate the section 234B and 234C interest if you paid late or fell short.
- 234C (deferred instalments)
- ₹20,200.00
- 234B (under 90% paid)
- ₹12,000.00
Estimate from the general rule (1%/month). 234C here does not apply the 12%/36% safe-harbour relaxation, so it is conservative. Confirm with your CA before paying.
How advance tax works
If your total tax for the year exceeds ₹10,000, you must pay it in four instalments: 15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March(cumulative). Falling short triggers interest under two sections.
- Section 234C — for deferring an instalment, 1% per month on the shortfall against each instalment target.
- Section 234B — if you paid less than 90% of the assessed tax as advance tax, 1% per month on the shortfall from 1 April of the assessment year until payment.
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A worked example
On ₹1,00,000 of total tax with nothing paid through the year, the 234C interest across the four instalments works out to about ₹5,050, plus 234B interest on the unpaid balance from 1 April.
Frequently asked questions
- When is advance tax due?
- In four instalments: 15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March (cumulative percentages of the year's tax).
- Who has to pay advance tax?
- Anyone whose total tax liability for the year, after TDS, exceeds ₹10,000. Taxpayers under the presumptive scheme pay 100% by 15 March.
- What's the difference between 234B and 234C?
- 234C is for deferring individual instalments during the year; 234B is for paying less than 90% of the assessed tax as advance tax by year-end.
- Is this exact?
- It's a conservative estimate — it doesn't apply the 12%/36% safe-harbour relaxation for the first two instalments. Confirm with your CA.
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