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In summary
Section 234C of the Income Tax Act, 1961 dealt with interest when a taxpayer did not pay the required advance tax by the prescribed instalment dates. The corresponding provision from 1 April 2026 is Section 425 of the Income Tax Act, 2025.
- Old provision: Section 234C of the Income Tax Act, 1961.
- Current provision: Section 425 of the Income Tax Act, 2025.
- Advance tax threshold: Rs. 10,000 or more, subject to applicable provisions.
- First three instalments: Interest of 3% on the prescribed shortfall.
- March instalment: Interest of 1% on the prescribed shortfall.
- Presumptive taxation: Eligible taxpayers generally pay the full advance tax by 15 March.
For the 2026-27 tax year, advance tax is generally payable when the tax payable is Rs. 10,000 or more. Under Section 425, the instalment requirements remain 15%, 45%, 75%, and 100%, while the interest is specified as 3% for the first three instalments and 1% for the March instalment.
What was Section 234C of the Income Tax Act?
Section 234C of the Income Tax Act, 1961 provided for interest on deferment of advance tax. It applied when the advance tax paid by an eligible taxpayer was below the prescribed cumulative percentage by the relevant due date.
Under the old framework, the cumulative targets were 15% by 15 June, 45% by 15 September, 75% by 15 December, and 100% by 15 March. Interest was generally calculated at 1% per month for three months for the first three instalments and 1% for the March instalment.
The provision was intended to encourage taxpayers to pay tax during the year rather than wait until the end of the financial year.
What is the current provision corresponding to Section 234C?
From 1 April 2026, the Income Tax Act, 2025 replaced the 1961 Act for the relevant tax years. Section 425 is the corresponding provision for interest on deferment of advance tax.
The new provision retains the broad advance-tax instalment structure but expresses the interest differently: the first three instalments carry 3% interest on the applicable shortfall, while the March instalment carries 1%.
The change is therefore more than a simple renumbering when explaining the calculation. Current tax-year content should use Section 425 and its statutory table.
Who needs to pay advance tax?
Advance tax generally applies when the tax payable for the relevant tax year is Rs. 10,000 or more, after considering the applicable tax credits and provisions. The threshold remains unchanged under the Income Tax Act, 2025.
It can apply to salaried individuals with substantial additional income, self-employed professionals, businesses, investors with taxable capital gains, and other taxpayers whose final tax liability is not sufficiently covered through TDS or other credits.
You can review the applicable Income Tax slabs when estimating your overall tax liability.
What are the advance tax instalment dates?
For taxpayers following the regular advance-tax payment schedule, the cumulative targets are as follows.
| Due date | Cumulative advance tax due |
|---|---|
| 15 June | 15% |
| 15 September | 45% |
| 15 December | 75% |
| 15 March | 100% |
Last updated: October 2026
These percentages continue under Section 425. However, the new provision also contains safe-harbour treatment for the first two instalments: no interest is payable on the relevant shortfall if advance tax paid by 15 June is at least 12% of tax due on returned income, or at least 36% by 15 September.
How is interest under Section 425 calculated?
Under the current framework, interest is calculated on the applicable shortfall rather than the entire tax liability.
For the first three instalments, Section 425 specifies 3% on the shortfall. For the 15 March instalment, the rate is 1%.
For example, assume the tax due on returned income is Rs. 4,00,000. By 15 September, the cumulative requirement is Rs. 1,80,000. If only Rs. 1,50,000 has been paid, the shortfall is Rs. 30,000.
The interest specified for the September instalment would be:
Rs. 30,000 × 3% = Rs. 900
This is an illustration. The actual calculation must account for the applicable statutory provisions and payments made by the relevant dates.
What happens when income arises unexpectedly?
Taxpayers cannot always predict capital gains, dividend income, lottery or other specified income at the beginning of a tax year. The law therefore provides relief for certain shortfalls attributable to specified income that could not reasonably be estimated earlier.
Under the corresponding provision, the relief can apply where the taxpayer pays the tax attributable to such income through the remaining advance-tax instalment or, where no instalment remains, by 31 March.
This is particularly relevant when taxable income changes substantially because of an investment transaction. You can read about Long Term Capital Gain Tax and Short Term Capital Gains Tax when assessing investment-related tax liabilities.
What are the rules for presumptive taxation?
Eligible taxpayers using the presumptive taxation framework do not follow the regular four-instalment schedule in the same way.
Under the Income Tax Act, 2025, taxpayers covered by the presumptive taxation provision must generally discharge their entire advance-tax liability by 15 March. This requirement continues the broad treatment under the earlier framework.
A taxpayer using presumptive taxation should therefore assess the applicable rules before assuming that the regular June, September, and December instalments apply.
Who may not be required to pay advance tax?
A resident senior citizen who does not have income chargeable under the head Profits and Gains of Business or Profession is generally not required to pay advance tax under the applicable provisions.
Advance tax is also not required where the relevant tax payable is below the Rs. 10,000 threshold. TDS, TCS, and other eligible tax credits should be considered when determining whether advance tax is payable.
The treatment should not be confused with deductions such as those under Section 80C of Income Tax Act, which concern deductions rather than advance-tax liability.
How does Section 234C differ from Section 234B?
Both provisions concerned advance tax, but they addressed different situations.
Section 234C dealt with deferment of instalments. It examined whether sufficient advance tax had been paid by the prescribed dates.
Section 234B dealt with default in payment of advance tax, including cases where the advance tax paid was less than 90% of assessed tax. Under the Income Tax Act, 2025, these provisions correspond to Sections 425 and 424, respectively.
You can also review 234B of Income Tax Act for the corresponding default provision.
What are the consequences of deferment?
The immediate consequence is statutory interest on the applicable advance-tax shortfall.
A taxpayer may also face additional compliance consequences where tax remains unpaid. However, Section 234C or Section 425 interest itself is not a separate tax on income. It is an interest charge arising from the statutory rules for advance-tax deferment.
If you have questions about return compliance, Section 139 of Income Tax Act provides related information on filing requirements.
How can you reduce the risk of advance-tax interest?
Advance-tax planning works best when you update your estimated tax liability during the year rather than relying on the previous year's income.
- Estimate income regularly: Include salary, business income, interest, dividends, and capital gains where applicable.
- Account for TDS and TCS: Reduce eligible tax already deducted or collected from the amount you need to pay.
- Track instalment dates: Review your cumulative payment against the applicable percentage before each deadline.
- Reassess after major transactions: Recalculate your tax position after significant capital gains or other unexpected income.
- Retain payment records: Keep challans and tax statements to reconcile payments during return filing.
You can also review Direct Tax Code 2025 and Assessment Year and Financial Year for broader tax-framework context.
How can investment income affect advance tax?
Investment income can increase your tax liability during the year. For example, selling an investment at a taxable gain or receiving dividend income may create additional tax that was not reflected in your earlier advance-tax estimate.
Taxpayers should therefore consider transactions that generate taxable income before the next advance-tax instalment. Information about LTCG on property, inheritance tax, and Section 206C of Income Tax Act can help with related tax considerations.
Conclusion
Section 234C of the Income Tax Act, 1961 dealt with interest for deferment of advance-tax instalments. For tax year 2026-27 onwards, the corresponding provision is Section 425 of the Income Tax Act, 2025.
The current framework retains the 15%, 45%, 75%, and 100% cumulative advance-tax targets, while Section 425 specifies 3% interest for the first three instalments and 1% for the March instalment. It also provides specific safe harbours and exceptions for certain situations.
Taxpayers should estimate income throughout the year, account for TDS and TCS, and reassess their advance-tax position when their income changes.
Last reviewed: October 2026
Mutual funds are subject to market risk. Please read the scheme-related documents carefully before investing.
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Does paying 100% of advance tax by 15 March remove all Section 234C interest?
Paying the full advance tax by 15 March can prevent interest relating to the March shortfall, but it does not automatically erase interest that may already have arisen for earlier instalments. Section 234C and the corresponding Section 425 examine advance tax against specified cumulative targets at each instalment date, subject to applicable safe harbours and exceptions.
Can I pay more advance tax in one instalment to compensate for an earlier shortfall?
Yes. Advance tax payments are cumulative, so a later payment increases the total amount paid for the year. However, paying extra later does not necessarily eliminate interest that has already arisen because an earlier instalment fell below the statutory requirement. You should therefore compare cumulative payments with each applicable instalment threshold rather than only checking the year-end total.
Does Section 234C apply to income earned for the first time from a new business?
The law provides relief where a shortfall is attributable to income from a business or profession that accrues or arises for the first time during the year, provided the applicable tax is paid through the remaining instalments or by 31 March when no instalment remains. The exemption is conditional and should not be treated as a blanket waiver.
Are capital gains automatically exempt from Section 234C interest?
No. The exception is not automatic merely because the taxpayer has capital gains. The shortfall must be attributable to capital gains that could not reasonably have been estimated earlier, and the tax attributable to that income must be paid within the period prescribed by the law. The timing and circumstances of the gain therefore matter.
Can Section 234C interest be claimed as a deduction from taxable income?
Section 234C interest is a statutory interest liability arising from deferment of advance tax. It should not be treated as an investment deduction or as an ordinary business expense without considering the applicable Income Tax provisions. The correct treatment depends on the nature of the taxpayer and the underlying liability, so professional tax advice may be appropriate for complex cases.
Does Section 234C apply separately to every source of income?
No. The calculation is based on the taxpayer's overall advance-tax liability and the prescribed cumulative payments, rather than applying a separate Section 234C calculation to every income source. However, the source and timing of income can affect whether a specific shortfall qualifies for an exception, particularly for capital gains, dividend income, or newly arising business income.
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