Missed the ITR deadline? s.234F fee + s.234A interest, computed
Missing the ITR deadline creates two different calculations. Section 234F is a filing fee. Section 234A is interest on unpaid net tax. They are not the same charge, they do not use the same base, and one can apply when the other does not. For FY 2025-26, the ITR individual/HUF no
Harun Raaj
Chartered Accountant · Harun Raaj & Associates
Missing the ITR deadline creates two different calculations. Section 234F is a filing fee. Section 234A is interest on unpaid net tax. They are not the same charge, they do not use the same base, and one can apply when the other does not.
For FY 2025-26, the ITR individual/HUF non-audit due-date reference says an individual or HUF return not requiring audit is due on 31 July 2026. The ITR audit-case due-date reference shows audit cases, including companies, firms and individuals requiring audit, with a 31 October 2026 due date. Section 234F provides the fee and Section 234A provides the interest mechanics. Sections 234B and 234C matter when advance-tax shortfall or instalment deferment is also present.
This guide gives the arithmetic under Sections 234A, 234B, 234C and 234F and a founder's checklist for separating the four questions.
First, identify the return category
The ITR audit-case due-date reference says the audit-case category covers companies, firms and individuals requiring audit. It also notes that audit reports are a separate timing item and that extensions can occur. The relevant entries carry verification notes on current-year extensions, so a missed calendar date is not enough to conclude that the return is belated. Check the applicable CBDT position for the facts and year.
⚠ Verify: CBDT may extend non-audit or audit-case ITR deadlines. Confirm any current-year extension at the income-tax portal before finalising the belated-return conclusion.
Section 234F: the flat fee
The penalty entry describes s.234F as a flat fee when the return is filed after the due date specified under s.139(1): ₹5,000 if total income exceeds ₹5 lakh, or ₹1,000 if total income is ₹5 lakh or below.
There is no daily multiplication in this entry. Section 234F provides that the fee applies once when the belated return is filed. The Section 234F examples are clear:
- Income ₹8 lakh, return filed late: ₹5,000.
- Income ₹3.5 lakh, return filed late: ₹1,000.
- No income, return filed late: ₹1,000 because total income is within ₹5 lakh.
The same entry says the fee is automatically added to the tax liability at the time of filing and deducted by the ITR portal before submission is confirmed. So the practical first step is to classify total income correctly, then allow for the fee as a one-time item. Do not use days late to inflate s.234F; that is not how Section 234F is structured.
Section 234A: interest on unpaid tax
Section 234A is a different calculation. The penalty entry describes 1% per month or part thereof as simple interest on unpaid tax from the due date of filing until filing. It applies where tax due, net of TDS and advance tax, remains outstanding when the return should have been filed.
The calculation base is described as tax assessed minus TDS deducted minus advance tax paid minus self-assessment tax paid before the due date. The period runs from the day after the return due date to the date of furnishing the return, or the assessment-order date if earlier.
The Section 234A examples:
- Tax due ₹1,00,000, return filed two months late: ₹1,00,000 × 1% × 2 = ₹2,000.
- Tax due ₹5,00,000, return filed four months late: ₹5,00,000 × 1% × 4 = ₹20,000.
- Tax due ₹2,00,000, filed 45 days late: 45 days rounds to two months, so ₹2,00,000 × 1% × 2 = ₹4,000.
The “part of a month” rule is the trap. Do not divide the delay into calendar days and prorate it for this calculation. Count the applicable months under Section 234A, with a partial month treated as a full month.
⚠ Verify: The source asks whether s.234A applies where TDS fully covers the tax liability but the return is late. It states that if net tax payable is nil, s.234A interest is nil even if filing is late. Confirm the specific computation with your CA.
A combined example
Suppose a non-audit individual has total income of ₹8 lakh, net tax payable of ₹1,00,000 after TDS and advance tax, and files the FY 2025-26 return two months after the applicable due date.
The calculation under Sections 234A and 234F is:
That is not necessarily the total amount payable on the return. It excludes the underlying tax and any s.234B or s.234C interest that may apply. It also assumes the due date was not extended and that the net-tax base has been correctly computed.
Where sections 234B and 234C fit
The statutory framework includes s.234B and s.234C because a late return may expose an advance-tax problem as well.
Section 234B provides 1% per month or part thereof on the shortfall in advance tax where advance tax paid is less than 90% of assessed tax. It provides the calculation base as assessed tax minus TDS minus advance tax, and the period as from 1 April immediately following the financial year to actual payment or assessment. Its example of assessed tax ₹5,00,000 and advance tax ₹4,00,000 gives a ₹1,00,000 shortfall and ₹5,000 interest for five months.
⚠ Verify: The s.234B entry asks the reviewer to confirm whether the case calculation uses the gross or net shortfall after TDS. It states the net base in the source, but your CA should confirm the facts.
Section 234C provides interest for deferment of advance-tax instalments. It gives 1% per month, with a three-month interest period for Q1, Q2 and Q3 shortfalls and a one-month period for Q4. The required cumulative percentages under Section 234C are 15% by 15 June, 45% by 15 September, 75% by 15 December and 100% by 15 March.
For assessed tax of ₹4,00,000 and no Q1 payment, the Section 234C example calculates a 15% shortfall of ₹60,000 and interest of ₹1,800. For the same assessed tax and no Q3 payment, the 75% shortfall is ₹3,00,000 and interest is ₹9,000.
⚠ Verify: The source asks whether the s.234C proviso applies to a first-year startup or another specific business-income fact pattern. Confirm applicability for the taxpayer rather than assuming the general instalment table answers it.
What founders should do after missing a date
- Identify the return category and applicable due date from the non-audit or audit-case entry.
- Check whether a CBDT extension changes the due date.
- Calculate total income for the s.234F band: above ₹5 lakh or ₹5 lakh and below.
- Calculate net tax outstanding after TDS, advance tax and qualifying self-assessment payment.
- Count s.234A months, treating a part month as a full month under Section 234A.
- Separately test the advance-tax conditions for s.234B and each s.234C instalment.
- Preserve the computation, challans, TDS evidence and filing acknowledgement.
- Review the portal's final demand before treating the matter as closed.
The worst process is to file first and reconstruct the numbers later. The better process is to prepare a short computation that shows the due date, income band, net tax base, months, and each applicable section. Your CA can then review facts rather than reverse-engineer a portal total.
FAQ
Is s.234F charged per day?
No. Section 234F provides for a flat fee applied once: ₹5,000 above ₹5 lakh or ₹1,000 at ₹5 lakh and below.
Can s.234A be zero even when the return is late?
Section 234A provides yes where net tax payable is nil because TDS and other credits fully cover the liability. Confirm the specific case.
Does 45 days late mean 1.5 months for s.234A?
No. The Section 234A example treats 45 days as two months because a part of a month counts as a full month.
Are s.234B and s.234C automatically part of every late return?
No. They are separate advance-tax tests. Run them only after reviewing assessed tax, TDS, advance tax and instalment payments.
Does filing late change the underlying tax?
Sections 234A and 234F describe fees and interest. They do not replace the underlying tax computation. Recompute the return itself and then add the applicable statutory amounts.
Statutory basis
- Section 234F — late ITR filing fee
- Section 234A — interest for default in furnishing return
- Section 234B — advance-tax shortfall
- Section 234C — advance-tax instalment deferment
- ITR individual/HUF non-audit due date
- ITR audit-case due date
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See Also
Go deeper with our hub guides
Statute-cited, section-by-section guides covering the same ground this article does.
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