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Calculate Section 234A, 234B & 234C income tax interest online for FY 2024-25 & AY 2025-26. Free India calculator with Rule 119A rounding support.
Calculate Section 234A, 234B & 234C income tax interest online for FY 2024-25 & AY 2025-26. Free India calculator with Rule 119A rounding support.
Frequently asked questions
| Installment | Due Date | Required % | Interest Period |
|---|---|---|---|
| 1st | 15 June | ≥ 15% | 3 months |
| 2nd | 15 September | ≥ 45% | 3 months |
| 3rd | 15 December | ≥ 75% | 3 months |
| 4th | 15 March | 100% | 1 month |
Calculate Section 234A, 234B & 234C income tax interest online for FY 2024-25 & AY 2025-26. Free India calculator with Rule 119A rounding support.
Work out income tax interest under Sections 234A, 234B, and 234C of the Income Tax Act, 1961. This calculator applies Rule 119A rounding automatically and shows late-filing interest, advance-tax default interest, and quarterly deferment interest separately, with a full breakdown.
CBDT extended the ITR due date for non-audit taxpayers for FY 2024-25 (AY 2025-26) from 31 Jul 2025 to 16 Sep 2025 (Circular No. 06/2025). If you're calculating 234A interest for this year, count the delay from the day after the extended date — using 31 July overstates your interest by roughly six weeks.
All three sections charge simple interest at 1% per month, or part of a month, on unpaid or deferred income tax. Each covers a different scenario — late filing, advance tax default, and quarter-wise deferment.
Unlike penalties, which need a separate notice, this interest is automatic. It appears directly in your tax intimation under Section 143(1).
| Section | Applies When | Interest Type |
|---|---|---|
| 234A | ITR filed after due date | Late filing interest |
| 234B | Advance tax paid below 90% of assessed tax | Advance tax default interest |
| 234C | Quarterly advance tax instalments missed | Deferment interest |
Applies to anyone who files their return after the due date.
Not sure if the audit threshold applies to you? Check the Section 44AB Tax Audit Applicability Checker before you run the numbers below.
One day past the due date counts as a full month. File on the 2nd, and you owe interest for the whole first month. Key rule: if you pay your full tax dues before the due date, 234A interest is nil even if the paperwork itself is filed a little late.
Applies when advance tax paid is less than 90% of assessed tax.
The 90% line is strict — fall ₹1 short and interest applies on the full shortfall from 1 April, not just the amount below 90%.
Exempt: resident senior citizens (60+) with no business or professional income don't need to pay advance tax at all — Section 207. Check your assessed tax first with the Salary Tax Calculator.
The most detailed of the three — it checks whether you paid the right percentage by each quarterly due date, not just the year-end total.
| Due Date | Required Cumulative % | Interest Period |
|---|---|---|
| 15 Jun | 15% of annual tax | 3 months |
| 15 Sep | 45% of annual tax | 3 months |
| 15 Dec | 75% of annual tax | 3 months |
| 15 Mar | 100% of annual tax | 1 month |
Most calculators skip this: no interest is triggered at the June or September check-ins as long as you've paid at least 12% (by 15 Jun) or 36% (by 15 Sep) — even though the "target" is 15% / 45%. There's no such cushion at the December or March check-ins; those are strict.
Exception: no 234C interest on a shortfall from capital gains, lottery winnings, or business profits arising after the relevant instalment date — provided you pay it in the next instalment, or by 31 March if none remains.
Presumptive taxation (44AD/44ADA): only one instalment — 100% by 15 March. Miss it, and it's 1% interest for one month, same as everyone else's fourth instalment.
Enter total tax liability — gross income tax before TDS or advance tax. Find it on your ITR computation or Form 26AS.
Enter TDS deducted — total from salary, bank interest, rent, etc. Check Form 26AS / AIS.
Enter advance tax paid — per quarter: 15 Jun, 15 Sep, 15 Dec, 15 Mar. Leave a quarter at zero if nothing was paid.
Enter self-assessment tax — anything paid via Challan 280 at filing time.
Select assessment year — AY 2025-26 for FY 2024-25 returns. Due date should auto-set to 16 Sep 2025, not 31 Jul.
Enter actual filing date — 234A runs from the day after the due date up to this date.
Calculate — see 234A, 234B, 234C separately plus the total, with Rule 119A rounding applied.
The previous version of this page said the tax base is rounded up when the leftover is ₹50 or more. That's not what the rule says. Rule 119A's own text reads: "any fraction of one hundred rupees shall be ignored" — the leftover is always dropped, never rounded up. The base used for interest is always rounded down to the nearest ₹100.
This calculator applies both rules, which is why its output should line up with the figure in your Section 143(1) intimation. Official text: Rule 119A, Income Tax Rules, 1962.
Yes, in genuine cases. Section 220(2A) lets the Principal Chief Commissioner or Chief Commissioner reduce or waive interest if:
All three conditions must be met, and the application goes to the higher authority — not the Assessing Officer. Reference: Section 220(2A), Income Tax Act, 1961.
From FY 2025-26 (AY 2026-27) onward, Sections 234A, 234B, and 234C are being renumbered as Sections 423, 424, and 425 under the new Income-tax Act, 2025 — the 1% monthly mechanism stays the same. Figures on this page for FY 2024-25 / AY 2025-26 are unaffected; that year is governed entirely by the old numbering.
All three charge 1% per month or part of a month (simple interest) on the unpaid or short-paid tax. Even a single day's delay in a month counts as a full month under Rule 119A.
Why does this calculator show September instead of July for AY 2025-26? +CBDT extended the ITR due date for non-audit taxpayers for FY 2024-25 (AY 2025-26) from 31 Jul 2025 to 16 Sep 2025 (Circular No. 06/2025). 234A interest for that year should be counted from the day after the extended date.
Can 234A, 234B, and 234C all apply in the same year? +Yes — 234C for missed quarterly instalments during the year, 234B from 1 April if advance tax paid was under 90%, and 234A from the day after the ITR due date if filed late with tax outstanding. 234A and 234B don't run on the same amount at the same time: 234B stops at the due date and 234A takes over from the next day.
Are senior citizens exempt from this interest? +Partially. Resident senior citizens (60+) with no business or professional income are exempt from advance tax, so 234B and 234C don't apply. 234A (late filing) still applies to everyone regardless of age.
Is there a minimum tax amount below which 234B/234C don't apply? +Yes — under Section 208, advance tax only kicks in once estimated tax liability exceeds ₹10,000 after TDS/TCS. At or below that, 234B and 234C don't apply.
This calculator provides estimates for guidance only. For advice specific to your situation, consult a chartered accountant or tax professional.
Calculations verified by our team including CA Anita Patil. View our full accuracy policy and meet the team →
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