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Case lawIncome-tax Act 2025Chapter XVII › Section 311
Chapter XVIIwas s.167B

Section 311 of the Income-tax Act, 2025

Section 311 — Charge of tax where shares of members in association of persons or body of individuals unknown, etc. Successor to s.167B of the 1961 Act.

Where this section sits

Section 311 is in Chapter XVII — Special Provisions Relating to Certain Persons, which runs from section 302 to section 355.

← Section 310  ·  Section 312 →

What this section does

Sub-section (1) charges tax on the total income of an association of persons or body of individuals at the maximum marginal rate where the individual shares of its members in the whole or any part of its income are indeterminate or unknown, subject to sub-section (2). Sub-section (2) raises that: where the total income of any member of such association or body is chargeable at a rate higher than the maximum marginal rate, the association or body is charged at that higher rate.

Sub-section (3) deals with the case where the individual shares are determinate or known. Clause (a): where the total income of any member for the tax year, excluding his share from the association or body, exceeds the maximum amount which is not chargeable to tax, the association or body is charged at the maximum marginal rate. Clause (b): where the total income of the association or body is chargeable at a rate higher than the maximum marginal rate, sub-clause (i) charges the portion of its total income relatable to that member's share at the higher rate, and sub-clause (ii) charges the balance of its total income at the maximum marginal rate.

Sub-section (4) supplies a deeming rule: shares are deemed indeterminate or unknown if they are indeterminate or unknown, in relation to the whole or any part of the income, on the date of formation of the association or body or at any time thereafter.

Why it is there

An association of persons or body of individuals is taxed as an entity, but the tax actually due depends on who the members are and what they earn — and an association whose member shares are left unstated could otherwise be used to park income at a lower slab rate than the members would pay. The section removes the advantage by charging the association at the maximum marginal rate, and it does so both where the shares are hidden and where they are known but the member is already above the exemption limit.

Who it applies to

The figures, and what each one turns on

Read the condition in the same row. A figure quoted without it is a wrong answer with a citation attached.
WhatFigureThe condition on itWhere
Rate on the total income where member shares are indeterminate or unknownThe maximum marginal rateSubject to sub-section (2), which substitutes a higher rate where a member's total income is chargeable at a rate higher than the maximum marginal rateSub-section (1)
Rate where a member is taxed above the maximum marginal rateThat higher rateApplied to the total income of the association or body in a case falling under sub-section (1)Sub-section (2)
Rate where shares are known but a member's other income exceeds the exemption limitThe maximum marginal rateWhere the total income of any member for the tax year, excluding his share from the association or body, exceeds the maximum amount which is not chargeable to taxSub-section (3)(a)
Split rate where the association's income is chargeable above the maximum marginal rateThe higher rate on the portion relatable to that member's share, and the maximum marginal rate on the balanceApplies where shares are determinate or known and the association's or body's total income is chargeable at a rate higher than the maximum marginal rateSub-section (3)(b)(i) and (ii)

What this means in practice

The maximum marginal rate is a floor here rather than a ceiling: sub-section (2) pushes the charge above it where a member is himself taxed at a higher rate, and sub-section (3)(b) splits the association's income so that the part relatable to such a member bears the higher rate while the rest still bears the maximum marginal rate. Knowing the shares does not by itself avoid the maximum marginal rate — under clause (3)(a) it is enough that any one member's own income, leaving out his share from the association, exceeds the maximum amount not chargeable to tax. The deeming rule in sub-section (4) is wide and unforgiving: indeterminacy at the date of formation or at any time thereafter, in relation to the whole or any part of the income, is enough to put the association into sub-section (1), so shares settled later do not undo it for a period in which they were unknown.

An example

Illustrative only, and invented for this page. The figures are chosen to show the rule biting, not taken from any real matter.

Three individuals form an association of persons whose deed does not state their shares in a part of its income. Sub-section (1) charges the association's total income at the maximum marginal rate, and sub-section (4) makes it immaterial that the members later agree on shares, since the shares were unknown at some time. If instead the deed fixes the shares clearly, but one member has other income of eight lakh rupees, exceeding the maximum amount not chargeable to tax, clause (3)(a) still charges the association's total income at the maximum marginal rate.

Where you meet this section

You meet this at the rate applied in the return and the assessment of an association of persons or body of individuals, and it is the usual ground on which an intimation or assessment order raises a demand by recomputing at the maximum marginal rate rather than the slab rates. The association's own constitution document is the evidence the question turns on.

The words themselves

tax shall be charged on the total income of such association or body at the maximum marginal rate
Section 311(1), Income-tax Act, 2025.
where the total income of any member of such association or body for the tax year (excluding his share from such association or body) exceeds the maximum amount which is not chargeable to, tax shall be charged on the total income of the association or body at the maximum marginal rate
Section 311(3)(a), Income-tax Act, 2025.
shall be deemed to be indeterminate or unknown if such shares (in relation to the whole or any part of such income) are indeterminate or unknown on the date of formation of such association or body or at any time thereafter
Section 311(4), Income-tax Act, 2025.

What people get wrong

What this replaced

The correspondence is the Income Tax Department’s own, from its comparison utility for the 1961 and 2025 Acts. A renumbering is the easy half; whether the words changed is the half that decides cases.

See the full 1961 to 2025 concordance.

Circulars of the Board on this section

A circular binds the department, not you and not a court. Every one below was written under the 1961 Act; it reaches this section because the department’s own concordance carries the provision it names to this one.

See the circulars index.

Case law carried across

Read this before you rely on it. Every decision below was decided under the Income-tax Act, 1961. It appears here because it is tagged to a 1961 provision that the department’s own mapping carries to section 311. That is an inference we have drawn, not a holding on the new section: where the words changed in the move, the reasoning may not survive. Treat this as the place to start looking, not as authority on the 2025 Act.

Explainers

What this page does not tell you. It does not reproduce the section. Everything above was written from the section’s own text as the Income Tax Department publishes it — the text is here, and nothing here is advice on your facts. Where a figure matters, read the sub-section it comes from.