Advance Tax Installment Deadline: Paying 15, 45, 75 and 100 Percent Across the Year

Tomorrow is Sunday 11 October 2026, and the banking and tax counters stay shut, so no cash actually has to move across the window on the day itself. What the date does is reset the clock on the single statutory marker every taxpayer with a liability of Rs 10,000 or more should already have circled: the third advance-tax installment due on 15 December 2026, by which point 75 per cent of the year's estimated tax must be in the government's hands under section 211 of the Income-tax Act 1961.

This watchlist walks through that deadline, the interest that sections 234B and 234C add when an installment is missed, the market events sitting on the near calendar, and the earnings position for the coming session. Every figure below is drawn from the Income Tax Department tax calendar, the Reserve Bank of India's 7 October 2026 policy release, or Oquilia's own rate configuration; where a fact cannot be verified it has been left out.

Statutory Deadlines

Section 211 splits the advance-tax burden into four installments across the financial year. An assessee whose total tax liability for the year, after tax deducted at source, is Rs 10,000 or more must pay in the proportions the Income Tax Department sets out in its tax calendar: 15 per cent by 15 June, 45 per cent cumulatively by 15 September, 75 per cent cumulatively by 15 December and the full 100 per cent by 15 March.

With the 15 September 2026 installment now behind us, the live marker is the third one on Tuesday 15 December 2026. Nothing is due on Sunday 11 October 2026 itself, but a taxpayer who has under-paid the 45 per cent due in September can use the ten weeks to 15 December to top up and limit the deferment interest already running. The simplest way to size the cheque is to run a current income estimate through Oquilia's advance tax calculator, which applies the section 211 percentages for you.

A worked example makes the cumulative design concrete. Take a professional who estimates a net tax liability of Rs 2,00,000 for FY 2026-27 after TDS. The four installments stack as follows, each date demanding the cumulative total less whatever was paid earlier.

Taxpayers who declare income on a presumptive basis under section 44AD or section 44ADA follow a lighter schedule: they are permitted to pay the entire advance tax in a single installment by 15 March 2027, as set out on incometax.gov.in. The ordinary four-date timetable does not apply to them, which is why confirming your filing basis before December matters; the distinction is explained in Oquilia's glossary entry on presumptive taxation.

Missing or deferring any installment is not free. Section 234C charges simple interest at one per cent per month for three months on each short-paid installment, while section 234B charges one per cent per month from 1 April of the assessment year where the advance tax actually paid falls below 90 per cent of the assessed tax, per the text of both sections on incometax.gov.in. Because the interest is computed installment by installment, a shortfall carried from the 15 September 2026 date keeps accruing until the 15 December 2026 top-up lands, which is the arithmetic case for not waiting. The difference between advance tax and the balancing payment made at filing is covered in the glossary note on self-assessment tax, and the broad definition of the levy sits under advance tax.

Market Events

There is no central-bank or regulator event scheduled for Sunday 11 October 2026; the markets are closed and no policy window opens on the day. The near-calendar marker that matters is the next meeting of the Reserve Bank of India's Monetary Policy Committee, scheduled for 2 to 4 December 2026, as recorded in the RBI's policy release of 7 October 2026 published at rbi.org.in.

That December meeting carries extra weight because the MPC changed direction on 7 October 2026, raising the repo rate by 25 basis points to 5.50 per cent in a unanimous vote, the first increase since February 2023 after four consecutive holds at 5.25 per cent. The stance shifted from neutral to calibrated tightening, with the RBI citing crude-oil volatility, a deficient monsoon and core inflation firming to a CPI print of 4.8 per cent in August 2026. The standing deposit facility now sits at 5.25 per cent and the marginal standing facility at 5.75 per cent.

For investors, the practical read-through is that EBLR-linked floating loans reset upward within about three months of the 7 October 2026 hike, so fresh borrowers and anyone on a floating home loan should expect higher resets into the December quarter. On the regulatory side, the Securities and Exchange Board of India's board decisions, including its recent clearance for foreign portfolio investors to enter non-agricultural commodity derivatives, are published at sebi.gov.in; nothing from that body falls specifically on 11 October 2026. Investors still deploying into equities through the volatility can model their contributions with Oquilia's SIP calculator.

Earnings

No company results are confirmed in the editorial briefing for Sunday 11 October 2026, and Indian exchanges do not hold trading or corporate-results sessions on a Sunday, so there is no verified earnings event to flag for the day. This watchlist does not publish a speculative results calendar; where a date is not confirmed against an exchange filing it is omitted rather than estimated.

What investors can do on a market-closed Sunday is housekeeping that feeds directly into the advance-tax arithmetic above. Capital gains realised up to 30 September 2026 feed into the 45 per cent installment that was due on 15 September 2026, and any gains booked in the October-to-December quarter will feed the 75 per cent cumulative figure due on 15 December 2026. Totting up realised gains for the quarter now, and running the revised liability through the income tax calculator, is the most useful thing a taxpayer can do with the quiet session.

FAQ

What advance-tax deadline is next after 11 October 2026?

The next installment under section 211 is the third one, due on Tuesday 15 December 2026, by which point 75 per cent of your estimated annual tax liability must be paid, according to the Income Tax Department tax calendar. Nothing is due on 11 October 2026 itself.

Who has to pay advance tax at all?

Any assessee whose total tax liability for FY 2026-27, after accounting for tax deducted at source, works out to Rs 10,000 or more must pay advance tax under section 211. Salaried taxpayers whose employers deduct the full TDS often fall below the threshold, but those with rental, capital-gains, interest or business income frequently cross it.

What interest applies if I miss the 15 December installment?

Section 234C levies simple interest at one per cent per month for three months on the shortfall in each installment, and section 234B adds one per cent per month from 1 April 2027 if the total advance tax paid during the year is below 90 per cent of the assessed tax, per the sections published on incometax.gov.in. The interest runs installment by installment, so a December shortfall compounds the cost of an earlier September miss.

Do presumptive taxpayers follow the same four dates?

No. Taxpayers under section 44AD or section 44ADA may pay their entire advance tax in a single installment by 15 March 2027, as set out on incometax.gov.in, rather than across the four section 211 dates. Confirm your filing basis before December so you apply the correct schedule.

Is there an RBI or SEBI event to watch tomorrow?

No policy event is scheduled for Sunday 11 October 2026. The next RBI Monetary Policy Committee meeting runs 2 to 4 December 2026, following the 25-basis-point hike to a 5.50 per cent repo rate announced on 7 October 2026, per rbi.org.in.

How do I calculate what I owe for the December installment?

Estimate your full-year income for FY 2026-27, compute the tax, subtract TDS already deducted, and pay 75 per cent of the net figure by 15 December 2026 less whatever you paid in June and September. Oquilia's advance tax calculator applies the section 211 percentages automatically once you enter the estimate.

Does advance tax apply under both the old and new regimes?

Yes. The section 211 installment schedule applies regardless of whether you have opted for the old or new regime; what changes is the tax computed on your income, after applying the regime's slabs, the section 87A rebate of up to Rs 60,000 available in the new regime for FY 2025-26 income up to Rs 12,00,000, and the applicable surcharge, which is capped at 25 per cent in the new regime.