October is the right time to start thinking about your December advance tax payment. Many taxpayers only remember advance tax when a notice or an interest demand arrives at the time of filing the return. By then, it is too late to avoid the extra cost. In this blog, we explain the December 2026 instalment, how to calculate it correctly, and how to avoid interest under Sections 234B and 234C.
What Is Advance Tax?
Advance tax is simply paying your income tax in parts during the year, instead of one lump sum after the year ends. The law expects you to estimate your income as you earn it and deposit tax on it through the year, not wait for March.
Advance tax shall be payable during a financial year in every case where the amount of such tax payable by the assessee during that year, as computed in accordance with the provisions of this Chapter, is ten thousand rupees or more. This covers salaried individuals with other income, business owners, professionals, freelancers, and companies. Pure salary income, where TDS is already deducted properly, usually does not create a separate advance tax burden, but once you add rental income, capital gains, freelance income, or interest income, advance tax can apply even to a salaried person.
The Instalment Schedule for FY 2026-27
For most taxpayers, advance tax is paid in four instalments:
| Due Date | Cumulative Tax Payable |
| 15 June 2026 | 15% of estimated tax |
| 15 September 2026 | 45% of estimated tax |
| 15 December 2026 | 75% of estimated tax |
| 15 March 2027 | 100% of estimated tax |
The percentages are cumulative, not additional. So by 15 December, you should have paid 75% of your full year’s estimated tax, counting whatever you already paid in June and September.
Taxpayers who have opted for presumptive taxation under Section 44AD or Section 44ADA follow a different, simpler rule. They can pay their entire advance tax in a single instalment by 15 March, instead of the four-part schedule.
A Quick Note on the New Law
You may be aware that the Income-tax Act, 2025 came into force from 1 April 2026. The advance tax instalment structure, percentages, and due dates continue unchanged under the new law. The only difference is the section number: what was Section 234C under the old Act corresponds to a different section number under the new Act. For FY 2025-26 filings, the old section numbers still apply; for Tax Year 2026-27 onwards, the new numbering will gradually come into use. Your CA will track this for you, but it is useful to know the rule itself has not changed, only its address in the law.
Why Capital Gains Need Special Attention
If you sold property, shares, or mutual fund units after an earlier instalment date, you do not need to go back and recalculate past instalments. The law allows you to include such gains in the remaining instalments after the date they arose. For example, a share sale in November can be factored into the December and March instalments without attracting interest for the earlier June or September instalments, as long as you pay the related tax in the instalment immediately following the transaction.
This is a common area where business owners and investors miss out, either paying too little or unnecessarily stressing about past instalments. If you had a large gain this year, from property, unlisted shares, or a sizeable stock market profit, this is the right time to recompute your estimate.
Interest You Could Face: Sections 234B and 234C
Two different interest charges apply if advance tax is not paid correctly, and they can both apply to the same taxpayer.
Section 234C: Deferment interest
This applies when you miss the percentage required at any instalment date, even if you pay the full tax by year-end. Interest is charged at 1% per month on the shortfall, generally for three months for the June, September, and December instalments.
For example, if you were required to pay 75% by 15 December but paid only 60%, interest at 1% per month applies on the 15% shortfall for three months.
Section 234B: Shortfall interest
This applies when your total advance tax paid during the year is less than 90% of your final assessed tax. Interest runs at 1% per month from 1 April of the next financial year until you pay the balance, however long that takes.
Both sections can apply together. A taxpayer who underpays through the year and only settles the balance while filing the return in the following year can end up paying several months of accumulated interest on top of the actual tax.
How to Avoid These Charges
- Review your income every quarter, not just once a year. Business income, freelance receipts, and investment gains change through the year. A single estimate made in April rarely stays accurate by December.
- Account for all TDS credits correctly. Check Form 26AS or the new annual tax statement to see what has actually been deducted on your behalf. Do not assume; verify.
- Build a small buffer. If your income is uncertain, slightly over-paying is safer than under-paying, since excess advance tax can be adjusted or refunded, but a shortfall always carries interest.
- Keep a running worksheet. A simple spreadsheet tracking income by month, expected TDS, and tax paid so far makes each instalment calculation quick instead of a yearly guessing exercise.
- Do not ignore business and professional income volatility. If your receipts have grown compared to last year, do not simply repeat last year’s advance tax figures. Recalculate based on current numbers.
Who Should Pay Special Attention This December
Freelancers and consultants: Income often comes in without TDS, or with TDS at a lower rate than your actual slab. Check your cumulative receipts for the year so far.
Business owners under GST 2.0 transition: If your margins or turnover changed due to the GST rate revision earlier this year, your profit estimate for the year may differ from last year’s pattern. Recompute rather than assume.
Investors with capital gains: Stock market or property transactions during the year should be factored into this instalment, especially if they happened after September.
Senior citizens without business income: You are exempt from advance tax requirements if you do not have income from business or profession. If you do have such income, the exemption does not apply.
NRIs with Indian income: Rental income, capital gains, or interest income from India can trigger advance tax obligations even while residing abroad. Many NRIs overlook this until the return is filed.
A Simple Pre-December Checklist
- Pull your income and expense figures for April to November
- Check actual TDS/TCS credited so far against Form 26AS or AIS
- Recalculate estimated annual tax liability
- Compare against 75% cumulative requirement
- Pay any shortfall through Challan before 15 December 2026
- Note down any capital gains that arose after September for correct treatment
Frequently Asked Questions
Do I need to pay advance tax if my employer deducts TDS on my salary?
If salary is your only income and TDS is properly deducted, you usually do not need separate advance tax. If you have other income on top of salary, you may still be liable.
What if I pay more than required in December?
No penalty applies to overpayment. Any excess is adjusted against your final tax liability or refunded.
I missed the September instalment. What should I do now?
Pay the shortfall along with the December instalment as soon as possible. You cannot avoid the 234C interest already accrued for September, but prompt payment stops further interest from building up.
Does advance tax apply under the new tax regime too?
Yes. Advance tax rules apply regardless of which tax regime you choose. Only the rate calculation changes.
Can presumptive taxpayers under Section 44AD skip the December instalment?
Yes, they can pay the full advance tax in a single instalment by 15 March instead of following the four-part schedule.
Final Words
Advance tax is often misunderstood as an extra burden, but it is simply your regular tax, paid in time. The businesses and individuals who review their numbers every quarter rarely face interest surprises at year-end. With the 15 December deadline approaching, this is the right moment to sit down with your figures, check your TDS credits, and make sure you are on track.
