Advance Tax for Salaried Investors: How Capital Gains Trigger Section 234B and 234C Interest

The Most Common Surprise in an Indian Tax Return

Every filing season, thousands of salaried taxpayers open their computed return and find two unfamiliar line items: interest under Section 234B and interest under Section 234C. Their reaction is always the same — "but my employer deducted TDS every month."

The answer is that salary TDS under Section 192 is calculated only on the salary and the declarations you gave your employer. It knows nothing about the ₹4 lakh capital gain you booked when you redeemed equity funds in July, the ₹1.1 lakh of bank and bond interest that accrued, or the dividends credited to your account. Those incomes carry a separate obligation: to pay advance tax in instalments during the year itself.

Today, 15 September, is the second advance tax instalment date. If you have booked gains this financial year, this article is for you.

Who Must Pay Advance Tax

Under Section 208 of the Income-tax Act, advance tax is payable by every assessee whose estimated total tax liability for the year, after reducing TDS and TCS, is ₹10,000 or more.

There is one significant exemption. A resident individual aged 60 years or above who has no income under the head "Profits and gains of business or profession" is not required to pay advance tax at all. A retired senior citizen earning pension, FD interest and capital gains can simply pay the entire tax as self-assessment tax before filing, with no 234B or 234C exposure. A 58-year-old in the same position gets no such relief.

Taxpayers who declare income on a presumptive basis under Section 44AD or 44ADA have a simplified obligation: the entire advance tax may be paid in a single instalment by 15 March.

The Four Instalment Dates and Cumulative Percentages

Note the word cumulative. By 15 September you must have paid 45% in aggregate, not an additional 45%. Any tax paid up to 31 March is still treated as advance tax for that financial year; after 31 March it becomes self-assessment tax and attracts interest.

Section 234C: Interest for Deferment of Instalments

Section 234C charges simple interest at 1% per month on the shortfall in each instalment:

• •1% for three months on the shortfall at the June, September and December dates.
• •1% for one month on the shortfall at the March date.

For the first three dates, the section is slightly lenient: no interest is charged if you have paid at least 12% by 15 June and 36% by 15 September (against the 15% and 45% requirements). There is no such cushion for December or March.

Illustration. Suppose your total tax liability for the year is ₹3,00,000 and TDS deducted is ₹1,80,000. Net advance tax payable is ₹1,20,000.

Total 234C interest: ₹3,060. Not catastrophic, but entirely avoidable.

The Capital Gains Relief Most People Miss

Here is the provision that saves salaried investors real money. The proviso to Section 234C states that no interest shall be levied for the shortfall in an instalment if the shortfall arose because of:

• •Capital gains (any head — equity, debt, property, gold),
• •Winnings from lotteries, crossword puzzles, card games and similar sources,
• •Dividend income (other than deemed dividend under Section 2(22)(e)),
• •Income from a business or profession newly set up during the year,

provided the taxpayer pays the whole of the tax on that income in the remaining instalments falling due after the income arises, or by 31 March if no instalment remains.

In plain language: if you sold a flat on 20 September 2026 and paid the full capital gains tax by 15 December 2026, you owe zero 234C interest on that gain — even though you paid nothing in June or September. But if you defer it to 15 March, the relief for the December instalment is lost.

This relief does not extend to Section 234B. Even a perfectly timed capital gain must be covered by 31 March, or 234B interest applies.

Section 234B: The Bigger Cost

Section 234B applies where advance tax paid during the year is less than 90% of the assessed tax. Interest runs at 1% per month or part of a month from 1 April of the assessment year until the date of payment, on the shortfall.

Because it runs from April onwards, 234B compounds with delay. A taxpayer with a ₹2,00,000 shortfall who files in December of the assessment year pays roughly ₹2,00,000 × 1% × 9 = ₹18,000 in interest. File in July instead and it is ₹8,000. There is no capital-gains proviso here — the only defence is to pay before 31 March.

Income Tax Slabs to Use for Your Estimate

For FY 2025-26, the default new regime under Section 115BAC carries these slabs for individuals:

A standard deduction of ₹75,000 is available to salaried taxpayers and pensioners, and the Section 87A rebate makes normal income up to ₹12,00,000 effectively tax-free for residents under the new regime. Health and education cess of 4% applies on tax plus surcharge. Always verify the rates notified for the year you are computing before you pay.

Crucially, the 87A rebate does not apply to income taxed at special rates such as long-term capital gains under Section 112A. So a taxpayer with ₹10 lakh salary and ₹3 lakh of equity LTCG still pays 12.5% on the gains above the ₹1.25 lakh annual exemption, even though the salary portion is rebate-covered. That is exactly the scenario that generates unexpected 234B interest.

A Practical Mid-Year Checklist

1. Pull your capital gains statement from the RTA/AMC and your broker for 1 April to date. Separate equity STCG (20%), equity LTCG (12.5% above ₹1.25 lakh), and other assets (slab rate for short term; 12.5% without indexation for long term where applicable).

2. Check Form 26AS and AIS for interest, dividends and TDS already credited. Remember TDS on dividends applies only beyond ₹10,000 per company per year, and bank TDS at 10% does not cover your full slab liability if you are in the 20% or 30% bracket.

3. Estimate full-year income, apply the slabs, add 4% cess, subtract TDS/TCS, and compare to the 45% and 75% cumulative milestones.

4. Pay through the e-Pay Tax facility on the income tax portal, selecting Challan ITNS 280 → (100) Advance Tax and the correct assessment year. Choosing "Self-Assessment Tax" by mistake is a common error that complicates matching.

5. Save the CIN/BSR challan details; they must be entered in the "Taxes Paid" schedule of your ITR.

Two Ways Salaried Employees Can Avoid the Whole Exercise

The simplest route is Section 192(2B): you may declare your other income — interest, dividends, even capital gains — to your employer, who will then deduct additional TDS from salary. Losses cannot be declared (except loss from house property). Because salary TDS is treated as spread evenly across the year, this route largely neutralises 234B and 234C exposure.

The alternative is to build a habit: every time you book a gain above roughly ₹1 lakh, immediately transfer the estimated tax into a separate liquid holding and pay it at the next instalment date. Investors who do this treat tax as a settlement cost of the trade rather than a year-end shock.

E-Square Tip: Set two calendar alerts — 10 December and 10 March — to download your realised capital gains statement and top up advance tax. The 234C proviso protects capital gains only if you pay in the instalment immediately after the gain arises, so a December gain paid in December costs nothing, while the same gain paid in March costs interest on both 234C and, if the year-end shortfall exceeds 10%, on 234B as well.