Reviewed by Finin2min Editorial Desk · Last reviewed 11 August 2026
Estimate the additional tax percentage for an updated return filed within one, two, three or four years from the end of the relevant assessment year.
Estimate updated-return payment
An updated return cannot be used to reduce tax, claim/increase a refund or report a loss in prohibited circumstances.
Additional-tax rate
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Net amount payable
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Component
Amount
Base tax and interest
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Additional income-tax
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Gross payment
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How This Is Calculated
An updated return (ITR-U) under Section 140B lets taxpayers file or correct a return within an extended window after the normal deadline, but at the cost of additional tax on the extra tax payable — the rate increases the longer you wait, in bands based on elapsed time (and a higher set of rates applies if the return is filed after receiving certain types of departmental notice).
Frequently Asked Questions
What is an updated return (ITR-U)?
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A mechanism under Section 140B allowing taxpayers to file a new return, or correct/add to a previously filed return, within an extended window beyond the normal and belated return deadlines — but only to report additional income, not to claim additional refunds or reduce previously reported income.
Why does the additional tax rate increase the longer I wait?
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The additional tax rate is structured in increasing bands based on how much time has elapsed since the end of the relevant assessment year — filing sooner within the ITR-U window costs less additional tax than filing later, incentivizing prompt voluntary correction.
Can I use ITR-U to claim a refund or reduce my declared income?
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No. An updated return can only be used to report additional income and pay additional tax — it cannot be used to claim a new or higher refund, reduce previously declared income, or increase a previously declared loss.
Under the Income-tax Act, 1961 as amended, an updated return can be filed within 48 months from the end of the relevant assessment year, subject to exclusions. Additional income-tax is 25%, 50%, 60% or 70% of the relevant tax-and-interest base by timing band; a section 148 notice-response updated return attracts an additional 10% of that base.
Do not file ITR-U to reduce tax, increase refund or create/increase loss where prohibited. Recompute tax, interest, fee and credits on the return itself before applying the additional-tax percentage.
Input integrity
Use source documents rather than approximate memory.
Confirm period, units, tax regime/category and sign conventions.
Test zero, threshold and just-above-threshold cases where relevant.
Output interpretation
Separate arithmetic output from legal eligibility/classification.
Preserve assumptions and the official-source date.
Use the linked detailed guide for exceptions and evidence.
Reviewed 22 August 2026. Always test later amendments, corrigenda and portal implementation before a live filing or transaction.
Methodology, assumptions and sources
Scope: Computes the additional tax payable on an updated return (ITR-U) filed under Section 139(8A), including the applicable additional-tax percentage based on when the updated return is filed within the permitted window.
Calculation logic
Compute the tax payable on the additional income being disclosed via the updated return (tax + interest + late fee, as applicable, computed as if this were the originally correct return).
Apply the additional tax surcharge: 25% of (tax + interest) if filed within 12 months from the end of the relevant assessment year, 50% if filed after 12 months but within 24 months, 60% if filed after 24 months but within 36 months, or 70% if filed after 36 months but within 48 months, per the current window and rates for updated returns.
Net off any tax already paid via the original/belated/revised return and available TDS/advance-tax credit to arrive at the incremental amount payable with the updated return.
Inputs and assumptions
Additional-tax percentages and the permitted filing window (up to 48 months from the end of the relevant assessment year, following the extension under the Finance Act) follow the provisions in force for the assessment year selected.
An updated return can only be used to disclose additional income (increase tax liability) — it cannot be filed to claim a refund, reduce previously reported income, or increase a loss, which the calculator's scope reflects.
Exclusions and edge cases
An updated return cannot be filed in certain circumstances (e.g., where a search/survey has been initiated, where assessment/reassessment proceedings are pending or completed for that year, or where it would result in a refund or reduced liability) — the calculator computes the tax figure only and does not itself check filing eligibility against these exclusions.
Does not compute interest under Sections 234A/234B/234C separately from the updated-return-specific additional tax — those are included as inputs to the base tax-plus-interest figure before the additional-tax percentage is applied, consistent with the statutory computation sequence.