How is Section 234C interest calculated for a shortfall in an instalment?

Section 234C levies interest at 1% per month (simple interest) on the shortfall between the required cumulative instalment and the amount actually paid, for a period of 3 months for the first three instalments (June, September, December) and 1 month for the March instalment. For example, if you were required to have paid 45% by 15 September but had paid only 30%, interest at 1% per month applies on the 15-percentage-point shortfall for 3 months. Capital gains and unforeseen income (e.g., a sudden bonus or lottery win) that arise after an instalment date are exempt from 234C for that instalment, provided the tax on them is paid in the immediately following instalment.

Income Tax

Advance Tax for Salaried Employees with Other Income: Due Dates, Calculation & Section 234C

Q: Does a salaried employee need to pay advance tax if TDS is already deducted?

If your only income is salary and your employer deducts adequate TDS, you generally do not need to pay advance tax separately. However, if you have additional income — rental income, capital gains, interest, freelance income — on which no or insufficient TDS is deducted, and your total tax liability for the year (after TDS) exceeds ₹10,000, you are required to pay advance tax on that shortfall in quarterly instalments, even though you are a salaried employee.

Q: What are the advance tax due dates and instalment percentages?

For individuals (other than those opting for presumptive taxation under Section 44AD/44ADA), advance tax is payable in four instalments: 15% of the estimated tax liability by 15 June, 45% (cumulative) by 15 September, 75% (cumulative) by 15 December, and 100% (cumulative) by 15 March. Taxpayers under presumptive taxation can pay 100% in a single instalment by 15 March without attracting interest.

Finin2min Tax Desk · June 2026 · Sections 208-234C FILING GUIDE

"Advance tax" sounds like something only businesses pay — but the moment a salaried employee earns rental income, sells shares for a gain, or freelances on the side, advance tax obligations can apply too. Missing them brings monthly interest under Sections 234B and 234C.

When Does Advance Tax Apply to a Salaried Person?

Under Section 208, advance tax must be paid if your total tax liability for the year, after reducing TDS already deducted, is ₹10,000 or more. For most salaried employees with only salary income, employer TDS covers this entirely. But the following additional income streams often aren't fully covered by TDS:

Capital gains from selling shares, mutual funds, or property — no TDS is deducted on capital gains for resident individuals
Rental income — TDS under Section 194-IB applies only if the tenant is an individual/HUF paying rent above ₹50,000/month, and even then often isn't deducted correctly
Interest income — banks deduct TDS at 10% (Section 194A), but if you're in the 20% or 30% slab, there's a shortfall
Freelance/consulting income — clients deduct TDS at 10% under Section 194J, again often less than your marginal rate
Dividend income above ₹5,000 — TDS at 10%, may be insufficient for higher-slab taxpayers

Quarterly Due Dates & Instalment Percentages

Due Date	Cumulative % of Estimated Annual Tax
On or before 15 June	15%
On or before 15 September	45%
On or before 15 December	75%
On or before 15 March	100%

"Cumulative" means the 45% due by September includes the 15% already paid in June — you're paying an additional 30% in the September instalment, not a fresh 45%.

⚠ Presumptive taxation exception: Taxpayers who have opted for presumptive taxation under Section 44AD or 44ADA can pay 100% of their advance tax in a single instalment on or before 15 March without attracting 234C interest, even though the general quarterly schedule applies to everyone else.

Worked Example: Salaried Employee with Capital Gains

Suppose your salary TDS fully covers the tax on your salary income, but you sold equity shares in August realising a long-term capital gain on which the tax (after the Section 112A exemption) works out to ₹40,000.

Instalment	Cumulative Requirement	Note
15 June	₹6,000 (15% of ₹40,000)	Gain arose in August — no 234C interest for this instalment if the tax is paid by the next due date
15 September	₹18,000 (45%)	Pay the full ₹18,000 now, since the gain has already arisen by this date
15 December	₹30,000 (75%)	Pay the incremental ₹12,000
15 March	₹40,000 (100%)	Pay the final ₹10,000

The "unforeseen income" exemption under Section 234C means capital gains, lottery winnings, or other income that genuinely could not have been anticipated do not attract interest for instalments due before the income arose — provided the proportionate tax is paid by the immediately following instalment.

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Estimate Tax on Capital Gains FirstWork out the exact tax on equity, debt or property gains before computing your advance tax instalment.

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Section 234B vs Section 234C: What's the Difference?

Section	Triggers When	Interest
234B	Total advance tax paid by 31 March is less than 90% of the assessed tax	1% per month (or part) from 1 April until the tax is paid, on the shortfall vs. assessed tax
234C	Any quarterly instalment falls short of the required cumulative percentage	1% per month for 3 months (1 month for the March instalment) on the shortfall for that instalment

234B is about the overall annual shortfall; 234C is about the timing of payments through the year. It's possible to pay 100% of your tax by 15 March (avoiding 234B) but still owe 234C interest for earlier quarters where you under-paid relative to the cumulative schedule.

How to Pay Advance Tax

Advance tax is paid using Challan 280 on the income tax e-filing portal, selecting "Advance Tax (100)" as the payment type. Keep the BSR code, challan serial number, and date — these are entered in the "Taxes Paid" schedule of your ITR. Pre-filled data in your Form 26AS / AIS will also reflect these payments after a short lag.

Frequently Asked Questions

Does a salaried employee need to pay advance tax if TDS is already deducted? ▼

If your only income is salary with adequate employer TDS, generally no. But if you have additional income — rental, capital gains, interest, freelance — on which TDS is nil or insufficient, and your remaining tax liability for the year exceeds ₹10,000, you must pay advance tax on that shortfall in quarterly instalments.

What are the advance tax due dates and instalment percentages? ▼

Four instalments: 15% by 15 June, 45% cumulative by 15 September, 75% cumulative by 15 December, and 100% cumulative by 15 March. Taxpayers under presumptive taxation (Section 44AD/44ADA) can pay 100% in one instalment by 15 March without 234C interest.

How is Section 234C interest calculated for a shortfall? ▼

1% per month (simple interest) on the shortfall between the required cumulative instalment and what was actually paid — for 3 months for the June/September/December instalments and 1 month for March. Capital gains and other unforeseen income arising after an instalment date are exempt for that instalment if the tax is paid in the next one.