Insertion of new section 140B

Insertion of new section 140B

Section 140B of the Income-tax Act, 1961 is the computational engine behind every ITR-U (Updated Return of Income) filed under Section 139(8A). It tells you exactly what you owe — base tax, interest, and an additional income tax premium — when you voluntarily correct an earlier omission. Following the Finance Act 2025 extension of the updated return window to 48 months, this provision is now more consequential than ever for AY 2026-27 and AY 2027-28 filers who are catching up on missed income.

What Section 140B Actually Governs

Section 140B was inserted into the Income-tax Act by the Finance Act 2022 alongside Section 139(8A). Its sole purpose is to prescribe how much you must pay when you file an updated return — and to ensure the payment precedes the submission of the form itself.

The provision covers two categories of taxpayers:

• Those who filed an original return for the relevant year but omitted income, claimed an excess deduction, or otherwise understated their liability.
• Those who never filed a return for that year and are now using the ITR-U route to regularise their position.

The legal framework is deliberate. Section 139(8A) gives you the right to file an updated return. Section 140B defines the price of exercising that right. Together, they convert a potential prosecution or penalty exposure into a structured, if progressively expensive, compliance path.

One critical point many taxpayers miss: the payment under Section 140B is a prerequisite, not a simultaneous obligation. You must pay the full challan amount and obtain an acknowledgement number before the e-filing portal will accept your ITR-U. Filing without a valid payment acknowledgement results in an invalid updated return — exactly the kind of technical error that can cost you the lower additional-tax slab if you then miss a deadline while correcting it.

The Additional Income Tax Slab: A Moving Target With Hard Deadlines

The additional income tax component of Section 140B escalates in four tiers based on how much time has elapsed since the end of the relevant Assessment Year. Following Finance Act 2025, which extended the ITR-U window from 24 months to 48 months, the slab structure now reads as follows (confirm current rates on the Income Tax portal at incometax.gov.in before any computation):

For AY 2026-27 (FY 2025-26), "end of the relevant AY" is 31 March 2027. The slab deadlines therefore fall on:

• 25% window closes: 31 March 2028
• 50% window closes: 31 March 2029
• 60% window closes: 31 March 2030
• Outer deadline (70%): 31 March 2031

For AY 2027-28 (FY 2026-27), shift each date forward by one year — the 25% window runs until 31 March 2029.

The practical implication is stark: a taxpayer who regularises an omission by March 2028 pays 25 paise extra per rupee of aggregate dues; the same taxpayer who waits until 2030-31 pays 70 paise extra. On a Rs. 1,00,000 aggregate liability, that difference is Rs. 45,000. This is not a marginal administrative cost — it materially affects post-tax economics.

The Precise Computation: Base, Formula, and Adjustments

The phrase "aggregate of tax and interest" in Section 140B has a specific meaning that diverges slightly depending on whether you previously filed a return.

If you filed an original return for that year

The base on which additional income tax is calculated is:

Base = (Tax + Interest on ITR-U income) − (Tax + Interest already paid or credited in earlier return) − (TDS/TCS/Advance Tax already appropriated in earlier return)

In other words, you are not paying additional income tax on taxes already discharged. The premium applies only to the incremental tax and interest arising from the newly disclosed income or corrected figures.

The total payable under Section 140B for this category is:

> (Tax on total income as per ITR-U) + (Interest under Sections 234A, 234B, and 234C on the full income) − (Tax/Interest already paid in original return including TDS/TCS/Advance Tax) + (Additional income tax at applicable slab %)

If you never filed a return for that year

The computation under Section 140B(3) applies. Here, no prior payment is available for deduction. The entire tax liability on the income disclosed in the ITR-U, together with applicable Section 234A/234B/234C interest, forms the aggregate. Additional income tax is then levied at the applicable slab rate on this gross aggregate.

Interest under Sections 234A, 234B, and 234C

These three interest provisions run independently of the Section 140B additional tax:

• Section 234A — interest for late filing of return, at 1% per month (or part month) from the due date of filing to actual date of filing. For most individuals, the regular ITR due date is 31 July.
• Section 234B — interest for shortfall in advance tax payment, at 1% per month from 1 April of the AY to the date of payment.
• Section 234C — interest for deferment of advance tax instalments during the FY, at 1% per month on each short-instalment.

All three accrue on the tax liability arising from the ITR-U, not just the original return's liability. This means a taxpayer who omitted Rs. 5,00,000 of capital gains faces 234B interest computed from 1 April of the AY forward — often 18–24 months of accumulation by the time the ITR-U is filed.

Step-by-Step: How to Compute, Pay, and File Under Section 140B

1. Reconstruct total income for the relevant year, incorporating all omitted income streams. Use the Annual Information Statement (AIS) and Taxpayer Information Summary (TIS) on the e-filing portal as your primary cross-reference.

1. Recompute tax at the applicable slab rates (or special rates — 20% for listed equity STCG under Section 111A for FY 2025-26, 12.5% for LTCG under Section 112A above Rs. 1.25 lakh, as amended by Finance Act 2024). Add applicable surcharge and 4% Health and Education Cess.

1. Compute interest under Sections 234A, 234B, and 234C on the revised total income. Use the online income tax calculator at incometax.gov.in or compute manually: 234B = 1% × (assessed tax − advance tax paid) × number of months from 1 April of AY to payment date.

1. Subtract taxes already paid: TDS (as per Form 26AS / AIS), TCS, advance tax paid, and self-assessment tax already paid and reflected in your earlier return.

1. Arrive at the aggregate (Step 2 + Step 3 − Step 4). This is the base for the Section 140B additional income tax.

1. Apply the slab percentage (25%/50%/60%/70%) to the aggregate to determine additional income tax.

1. Sum the total: Aggregate + Additional income tax = amount payable via Challan ITNS-280.

1. Pay via ITNS-280 on incometax.gov.in — Major Head 0021 (Income-tax other than companies for individuals/HUFs), Minor Head 300 (Self-Assessment Tax). Note the BSR code, challan serial number, and date of tender — all three are required in the ITR-U form.

1. File ITR-U on the e-filing portal (incometax.gov.in → e-File → Income Tax Returns → File Updated Return). Select the correct Assessment Year. The portal utility pre-populates the earlier return data; you enter the revised figures and the challan details. After e-verification via Aadhaar OTP or net banking, download the ITR-U acknowledgement (ITR-V).

Worked Examples: What the Numbers Actually Look Like

Example 1 — Missed FD Interest (AY 2026-27, salaried taxpayer, 30% bracket)

Kavita is a salaried professional whose original AY 2026-27 return declared total income of Rs. 14,00,000. She discovers in September 2027 that she omitted Rs. 2,00,000 of bank FD interest that appears clearly in her AIS.

If Kavita waits until, say, January 2030 (beyond 24 months but within 36 months of AY end), the 60% slab applies instead: additional income tax becomes Rs. 28,810 — a Rs. 16,806 premium for procrastination.

Example 2 — Omitted Short-Term Capital Gains on Listed Shares (AY 2026-27, no prior return)

Rahul, a first-time return non-filer, sold listed shares in FY 2025-26 and made STCG of Rs. 5,00,000 (taxable under Section 111A at 20% from FY 2025-26 onwards per Finance Act 2024). He has no other income above the basic exemption limit beyond the capital gain.

Filing even six months later — past the 12-month mark — would flip the rate to 50%: additional income tax of Rs. 65,520, a Rs. 32,760 extra outflow for delay.

Who Cannot File ITR-U — The Disqualifications

Section 139(8A) contains explicit bars. Filing an ITR-U when any of these apply is invalid, regardless of whether you complete the payment and upload the form:

1. Loss return or reduced tax outcome: ITR-U cannot result in a net loss, reduce total income below the original return, or generate a higher refund than the original return. It can only increase tax liability.

1. Search or survey proceedings: Where a search under Section 132 or survey under Section 133A has been initiated for the relevant assessment year (or the immediately preceding year in certain cases).

1. Prosecution proceedings: Where proceedings have been launched under Sections 276C or 276CC (prosecution for wilful failure to furnish return or evasion).

1. Assessment, reassessment, revision, or re-computation pending: If a scrutiny notice under Section 143(2) has been issued, or reassessment under Section 147 is open, or revision under Section 263/264 is in progress.

1. Information under specified exchange provisions: Where the Assessing Officer possesses information under Section 90, 90A, or 135A (foreign asset disclosure or information exchange) relating to that year.

1. Earlier updated return already filed for that year: You get one bite. Once an ITR-U has been validly filed for a given AY, a second updated return for the same year is not permitted.

These bars have teeth. A taxpayer who files an ITR-U for a year already under scrutiny faces a potential void filing — and having paid the challan does not cure the defect.

AIS and TIS as the Primary Section 140B Trigger

Most Section 140B filings today are prompted not by voluntary introspection but by a mismatch visible in the Annual Information Statement (AIS) on incometax.gov.in. The AIS aggregates:

• Part I: General information (SFT filers, TDS/TCS deductors)
• Part II: Tax information (salary, rent, dividends, interest, securities transactions, mutual fund transactions, foreign remittances, property registrations, GST turnover, and more)

The Taxpayer Information Summary (TIS) consolidates AIS data by category and shows "processed value" versus "derived value" for each head. Where the derived value (what the ITD computed from third-party data) exceeds the processed value (what your return declared), a discrepancy flag appears.

Common triggers in practice include: FD interest deducted by TDS but not declared in the return, mutual fund redemptions reported by the fund house under SFT-18, equity dividends reported by companies, property sale proceeds reported by sub-registrar offices, and foreign remittances above threshold reported by authorised dealers.

The AIS feedback mechanism allows you to accept, contest, or seek clarification on each entry. Where you accept an entry that creates a tax shortfall, Section 139(8A) / Section 140B together provide the regularisation path. Where you contest and the ITD upholds the original entry, the same path applies — but now you have AO-level attention on the year.

Strategic use: Review your AIS each October after the Vivad se Vishwas deadline season, while the 25% additional-tax window for the preceding AY is still open. For AY 2026-27, October 2027 is a useful checkpoint — the 12-month (25%) window remains open until March 31, 2028.

Common Mistakes That Derail ITR-U Filings

Even experienced filers make avoidable errors when using the ITR-U utility. These are the most consequential ones seen in practice:

• Filing ITR-U to claim a refund or reduce a tax liability. This is expressly prohibited. If your revised computation shows a lower liability than the original, the law does not permit you to use ITR-U — use the rectification route under Section 154 instead.

• Paying challan after starting the ITR-U draft. The portal requires the challan details upfront. Pay ITNS-280 first; then open the ITR-U utility.

• Selecting the wrong Assessment Year. The AY in ITR-U must match the year of omission. AY 2026-27 = FY 2025-26 (April 1, 2025 to March 31, 2026). Choosing AY 2027-28 by mistake for FY 2025-26 income is an irrecoverable error unless caught before e-verification.

• Omitting Section 234A interest. Many taxpayers compute 234B and 234C but overlook 234A when the updated return is filed well after the original due date of 31 July. Section 234A accrues on the incremental tax from the original due date to the date of filing.

• Using Minor Head 400 (Tax on Regular Assessment) instead of Minor Head 300 (Self-Assessment Tax) on ITNS-280. The ITD's processing system expects Minor Head 300 for ITR-U payments.

• Failing to reconcile AIS before filing. If AIS shows Rs. 4,00,000 of mutual fund gains but your ITR-U declares only Rs. 2,50,000, the mismatch raises a fresh CPC processing query — negating the very clean-up the ITR-U was meant to achieve.

• Filing for a year where scrutiny notice has already been issued. A Section 143(2) notice for that AY bars ITR-U. Check the e-proceedings tab on incometax.gov.in before initiating.

• Not retaining working notes. If the ITD later raises a query about the Section 140B computation, you need documented evidence of the tax-and-interest workings, the AIS entries cross-referenced, and the challan trail.

Key Takeaways

• Section 140B is the payment formula for ITR-U; Section 139(8A) is the filing right. You cannot use one without satisfying the other.
• The additional income tax slab is tiered at 25% / 50% / 60% / 70% of the net aggregate of tax and interest, escalating with delay from the end of the relevant AY. Filing early is not merely procedurally tidy — it is financially material.
• For AY 2026-27, the 25% window closes on 31 March 2028. The outer four-year deadline is 31 March 2031.
• The additional income tax base is the incremental liability (new tax + interest minus taxes already credited), not the gross tax on updated income — a distinction that substantially reduces the effective premium in many cases.
• Pay ITNS-280 before opening the ITR-U utility on incometax.gov.in. The challan acknowledgement is a pre-condition, not an attachment.
• ITR-U is barred where it would result in a refund, a reduced liability, or where assessment / search / prosecution proceedings are active for that year.
• Use the AIS feedback mechanism proactively each October to identify discrepancies while the cheapest additional-tax window remains open for the preceding year.