Section 234B & 234C — Interest on Advance Tax Shortfall

Q: What is Section 234B interest?

Section 234B charges interest when the total advance tax paid during the financial year is less than 90% of the assessed tax liability. The interest rate is 1% per month (simple interest) on the shortfall amount, calculated from 1 April of the assessment year until the date of self-assessment tax payment or actual filing (whichever is applicable). For example, if your tax liability is ₹1,00,000 and you paid only ₹80,000 as advance tax, you are liable for Section 234B interest on the ₹10,000+ shortfall (since you paid less than 90% of ₹1 lakh).

Q: How is Section 234C interest calculated?

Section 234C applies when any advance tax installment is less than the required cumulative percentage. The required payments are: 15% by 15 June, 45% by 15 September, 75% by 15 December, and 100% by 15 March. If you miss any installment, interest at 1% per month is charged for 3 months on the shortfall. For example, if your tax liability is ₹1,00,000 and you pay nothing by 15 June (should be ₹15,000), interest = 1% × 3 months × ₹15,000 = ₹450 for that installment.

Q: How can I avoid Section 234B and 234C interest?

To avoid Section 234B: ensure total advance tax paid is at least 90% of your final tax liability. To avoid Section 234C: pay each installment on or before the due date at the required cumulative percentage — 15% by 15 Jun, 45% by 15 Sep, 75% by 15 Dec, 100% by 15 Mar. Estimate your income midway through the year and revise advance tax payments accordingly. Taxpayers with salary income can request their employer to adjust TDS to cover the liability and avoid advance tax installments.

Q: Is advance tax interest (234B/234C) tax-deductible?

No. Interest paid under Sections 234A, 234B, and 234C is not deductible as a business expense or otherwise under the Income Tax Act. These are penal/compensatory charges for delayed payment of tax and are not treated as a cost of earning income. They are paid from post-tax funds and cannot reduce your taxable income.

Q: When does Section 234B apply to self-employed individuals?

Section 234B applies to all taxpayers whose tax liability (after TDS) exceeds ₹10,000 in a financial year — including salaried, self-employed, and business owners. Self-employed individuals (freelancers, consultants, business owners) are particularly vulnerable because no TDS is deducted by a client or employer on most business receipts. They must estimate their income and pay advance tax in four installments. If the total advance tax paid falls short of 90% of the final assessed tax, Section 234B interest kicks in from 1 April of the assessment year.

Updated: 3 June 2026

Quick summary: Section 234B — Interest when total advance tax paid is less than 90% of assessed tax. Rate: 1% per month from 1 April of assessment year until self-assessment tax payment date. Section 234C — Interest on installment shortfall when each installment (due 15 Jun, 15 Sep, 15 Dec, 15 Mar) is below the required cumulative percentage (15%, 45%, 75%, 100%). Rate: 1% per month for 3 months per missed installment. Section 234A — Interest on delayed ITR filing: 1% per month from the due date to the actual filing date.

1%/mo 1% per month simple interest on advance tax shortfall — Section 234B and 234C. Applies whenever your advance tax payments fall below the required thresholds.

Section 234A, 234B, 234C — Comparison

All three interest provisions charge simple interest at 1% per month or part of a month. The key difference is what triggers each and how the calculation period is defined.

Section	Trigger	Rate	From	To	Formula
234A	ITR filed after due date	1% / month	Day after ITR due date	Actual date of filing	1% × months × (tax payable − TDS − advance tax)
234B	Advance tax paid < 90% of assessed tax	1% / month	1 April of assessment year	Date of self-assessment tax payment	1% × months × (assessed tax − advance tax paid)
234C	Each installment below required %	1% / month for 3 months	Day after installment due date	3 months later (or next installment date)	1% × 3 × (required installment − actual payment)

Advance Tax Installment Schedule

Every taxpayer with a tax liability exceeding ₹10,000 (after TDS) must pay advance tax in four installments. Missing or underpaying any installment triggers Section 234C interest.

Installment	Due Date	Cumulative % Required	Section 234C Interest if Missed
1st Installment	15 June	15% of estimated annual tax	1% × 3 months on shortfall
2nd Installment	15 September	45% of estimated annual tax	1% × 3 months on shortfall
3rd Installment	15 December	75% of estimated annual tax	1% × 3 months on shortfall
4th Installment	15 March	100% of estimated annual tax	1% × 1 month on shortfall

Special Rule for Presumptive Taxation (Section 44AD/44ADA)

Taxpayers opting for presumptive taxation under Section 44AD or 44ADA have a simplified advance tax requirement: pay 100% of advance tax by 15 March of the financial year. They are exempt from the three earlier installments (15 Jun, 15 Sep, 15 Dec). Missing the 15 March deadline triggers Section 234C at 1% per month for 1 month on the full shortfall, and Section 234B applies thereafter.

Frequently Asked Questions

What is Section 234B interest?

Section 234B charges interest when the total advance tax paid during the financial year is less than 90% of the assessed tax liability. The interest rate is 1% per month (simple interest) on the shortfall amount, calculated from 1 April of the assessment year until the date of self-assessment tax payment or actual filing (whichever is applicable). For example, if your tax liability is ₹1,00,000 and you paid only ₹80,000 as advance tax, you are liable for Section 234B interest on the ₹10,000+ shortfall (since you paid less than 90% of ₹1 lakh).

How is Section 234C interest calculated?

Section 234C applies when any advance tax installment is less than the required cumulative percentage. The required payments are: 15% by 15 June, 45% by 15 September, 75% by 15 December, and 100% by 15 March. If you miss any installment, interest at 1% per month is charged for 3 months on the shortfall. For example, if your tax liability is ₹1,00,000 and you pay nothing by 15 June (should be ₹15,000), interest = 1% × 3 months × ₹15,000 = ₹450 for that installment.

How can I avoid Section 234B and 234C interest?

To avoid Section 234B: ensure total advance tax paid is at least 90% of your final tax liability. To avoid Section 234C: pay each installment on or before the due date at the required cumulative percentage — 15% by 15 Jun, 45% by 15 Sep, 75% by 15 Dec, 100% by 15 Mar. Estimate your income midway through the year and revise advance tax payments accordingly. Taxpayers with salary income can request their employer to adjust TDS to cover the liability and avoid advance tax installments.

Is advance tax interest (234B/234C) tax-deductible?

No. Interest paid under Sections 234A, 234B, and 234C is not deductible as a business expense or otherwise under the Income Tax Act. These are penal/compensatory charges for delayed payment of tax and are not treated as a cost of earning income. They are paid from post-tax funds and cannot reduce your taxable income.

When does Section 234B apply to self-employed individuals?

Section 234B applies to all taxpayers whose tax liability (after TDS) exceeds ₹10,000 in a financial year — including salaried, self-employed, and business owners. Self-employed individuals (freelancers, consultants, business owners) are particularly vulnerable because no TDS is deducted by a client or employer on most business receipts. They must estimate their income and pay advance tax in four installments. If the total advance tax paid falls short of 90% of the final assessed tax, Section 234B interest kicks in from 1 April of the assessment year.

Advance Tax Due Dates Challan 280 Income Tax Penalty ITR Filing Section 44AD

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