Advance tax schedule
The four instalments, what is short against each, and the section 234C interest that follows a shortfall.
Tax for the year after credit for TDS and TCS.
A resident senior citizen with no business or professional income is not liable at all.
Section 234C interest
₹20,200.00
| Tax for the year | ₹4,00,000.00 |
|---|---|
| Paid so far | ₹0.00 |
| Still to pay | ₹4,00,000.00 |
| Section 234C interest1% a month on each shortfall. | ₹20,200.00 |
| Due | Cumulative | Paid | Short | Interest |
|---|---|---|---|---|
| 15 June15% of the year | ₹60,000.00 | ₹0.00 | ₹60,000.00 | ₹1,800.00 |
| 15 September45% of the year | ₹1,80,000.00 | ₹0.00 | ₹1,80,000.00 | ₹5,400.00 |
| 15 December75% of the year | ₹3,00,000.00 | ₹0.00 | ₹3,00,000.00 | ₹9,000.00 |
| 15 March100% of the year | ₹4,00,000.00 | ₹0.00 | ₹4,00,000.00 | ₹4,000.00 |
How this worksShow
The instalments are cumulative
15%, 45%, 75% and 100% are running totals, not four separate quarters. By 15 September you must have paid 45% of the year’s tax altogether — which, if 15% went in June, is another 30% now. Reading them as four equal quarters underpays the second and third dates every year.
| Rule | Figure | Statutory basis |
|---|---|---|
| Advance tax is payable at all | tax ≥ ₹10,000 | s.208, Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| 15 June | 15% cumulative | s.211(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| 15 September | 45% cumulative | s.211(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| 15 December | 75% cumulative | s.211(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| 15 March | 100% cumulative | s.211(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| Presumptive — 44AD and 44ADA | 100% by 15 March | Proviso to s.211(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| Senior citizen with no business income | not liable | s.207(2), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
A shortfall is not always interest
Section 234C forgives the first instalment entirely if 12% of the year’s tax has been paid, and the second if 36% has. So a taxpayer who paid 12.5% by 15 June is short of the 15% instalment and owes nothing — which is why this calculator shows the harbour beside the gap rather than the gap alone.
Once the harbour is missed, though, interest runs on the whole way to the instalment. Paying 10% by 15 June is not two per cent short; it is five per cent short, and 1% a month for three months runs on all of it.
- Interest is 1% a month for three months at each of the first three dates, and for one month at the last.
- A shortfall is rounded down to the nearest hundred rupees before interest is worked out, and part of a month is ignored.
- Section 234B is separate and comes later: 1% a month from 1 April where the advance tax paid is under 90% of the assessed tax.
| Rule | Figure | Statutory basis |
|---|---|---|
| Rate | 1% a month | s.234C, Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| Safe harbour, 15 June | 12% paid | Provisos to s.234C(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| Safe harbour, 15 September | 36% paid | Provisos to s.234C(1), Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
| Rounding of the shortfall | down to ₹100 | Rule 119A, Income-tax Act 1961; corresponding provision, Income-tax Act 2025 to be confirmed |
What this page cannot know
It takes the year’s tax as a figure you supply. In practice that figure moves — a large invoice in February, a capital gain in March, TDS that turns out lower than expected — and section 234C has its own reliefs where a shortfall is caused by income that could not have been estimated earlier. ComplyADI keeps the estimate current from the books themselves, which is the difference between a calculation and a plan.
Rates and thresholds as at 10 September 2026. This page is an estimate, not professional advice, and it is not a filing.
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