Interest under Section 234C, 234B, and 234A of Income Tax Act – FY 2024-25 Guide
The Indian Income Tax Act imposes interest penalties when taxpayers fail to pay their taxes on time.
This guide explains how interest under Section 234C, 234B, and 234A is levied and calculated for FY 2024–25.
These penal interest provisions under Sections 234C, 234B, and 234A are meant to ensure timely tax payment and compliance.
Let us understand each of these sections, what they cover, on what amount the interest is calculated, and how the extended due date of September 15, 2025 (for FY 2024–25) impacts them.
Section 234C: Interest for Deferment of Advance Tax
When it applies: A taxpayer becomes liable under Section 234C if they fail to pay advance tax as per the prescribed schedule.
Advance Tax Installment Schedule (FY 2024-25):
| Due Date | Minimum % of Total Tax Payable |
| 15 June 2024 | 15% |
| 15 September 2024 | 45% |
| 15 December 2024 | 75% |
| 15 March 2025 | 100% |
Interest Rate: 1% per month (or part thereof)
Interest calculated on: The taxpayer calculates interest on the shortfall amount in each required advance tax installment, considering cumulative payments made up to each due date.
Interest Period: – 15 June, 15 September & 15 December: Interest for 3 months and for 15 March: Interest for 1 month
Example: – Total tax liability: ₹6,00,000, Required cumulative payments: by 15 June: ₹90,000, by 15 September: ₹2,70,000, by 15 December: ₹4,50,000, by 15 March: ₹6,00,000, Advance tax paid: on 15 June: ₹30,000, on 15 September: ₹1,50,000 (Cumulative = ₹1,80,000), on 15 December: ₹1,80,000 (Cumulative = ₹3,60,000), on 15 March: ₹1,00,000 (Cumulative = ₹4,60,000)
| Installment | Required Cumulative | Actual Cumulative | Shortfall | Interest Period | Interest Amount |
| 15 June | ₹90,000 | ₹30,000 | ₹60,000 | 3 months | ₹1,800 |
| 15 Sept | ₹2,70,000 | ₹1,80,000 | ₹90,000 | 3 months | ₹2,700 |
| 15 Dec | ₹4,50,000 | ₹3,60,000 | ₹90,000 | 3 months | ₹2,700 |
| 15 Mar | ₹6,00,000 | ₹4,60,000 | ₹1,40,000 | 1 month | ₹1,400 |
Total Interest under 234C = ₹1,800 + ₹2,700 + ₹2,700 + ₹1,400 = ₹8,600
Section 234B: Interest for Short Payment of Advance Tax
When it applies: If you have not paid at least 90% of your total tax liability as advance tax by 31 March 2025.
Interest Rate: 1% per month (or part thereof)
Interest calculated on: Tax payable after reducing advance tax and TDS.
Interest Period: From 1 April 2025 to the date of payment of self-assessment tax.
Example: Total tax liability: ₹6,00,000, TDS: ₹1,00,000, Advance tax paid by 31 March: ₹4,50,000 (Total paid = ₹5,50,000 < 90%), Self-Assessment Tax (paid on 20 July 2025): ₹50,000
Outstanding as on 1st April 2025 = ₹50,000 (paid on 20th July 2025 as Self-Assessment Tax)
Interest from 1 April to 20 July = 4 months (Apr, May, Jun, Jul). Interest = 1% x 4 x ₹50,000 = ₹2,000
Section 234A: Interest for Late Filing of Return
When it applies: If you file your return after the due date (which is 15 September 2025 for FY 2024-25), and any part of the tax remains unpaid as on the filing date.
Interest Rate: 1% per month (or part thereof)
Interest calculated on: taxpayer calculates interest on the unpaid portion of tax as on the filing date.
Interest Period: From 16 September 2025 to the actual date of filing return only if tax is unpaid as on 15 September.
Example: – Total tax: ₹6,00,000, TDS: ₹1,00,000, Advance tax: ₹4,50,000, Self-Assessment Tax: ₹50,000 (paid on 20 July 2025)
If return is filed on 30 October 2025: – Since the full tax was already paid before the due date (15 Sept 2025), no interest under 234A is applicable, even though the return is late.
Note: Section 234A applies only when tax is unpaid as of the due date.
Note:
Naveen Kumar, Senior Partner, N R Valecha & Associates, says, “Interest under section 234A is chargeable at the rate of 1% on unpaid tax only if the ITR is filed after the due date specified in Section 139(1). Since CBDT through its circular has announced the due date extension, as provided under Section 139(1) from July 31, 2025, to September 15, 2025. Thus, interest under Section 234A should only be levied for the period after 15 September 2025. “
Summary Table
| Section | Trigger | Interest Rate | Calculated On | Interest Period |
| 234C | Advance tax installment shortfall | 1% p.m. | Cumulative shortfall by each due date | Jun, Sep & Dec: 3 months, Mar: 1 month |
| 234B | <90% tax not paid by 31 March | 1% p.m. | Total unpaid tax | 1 April till date of payment |
| 234A | ITR filed after due date (15 Sept) | 1% p.m. | Unpaid tax | 16 Sept till date of filing |
Final Notes
- both sections 234C and 234B not affected by the due date extension.
- Section 234A will apply only if you file after 15 September 2025 (for FY 2024-25).
- Interest is simple interest, and not compounded.
- For high-value transactions, interest may run into thousands, so timely tax planning is key.
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