Mutuality requires complete identity of contributors and participators; later rule changes cannot retrospectively alter earlier tax treatment.

Mutuality applies only where there is complete identity between contributors to the common fund and participators in the surplus; membership alone is insufficient if interest income arises from lending to only some members while surplus is shared more broadly. On that basis, the interest income failed the mutuality test for the earlier years. A later amendment to the surplus-distribution rule could not be applied retrospectively to alter the tax character of completed transactions and operated only prospectively. Interest paid on members' deposits was allowable as business expenditure, and mutuality was recognised for the assessment year 1991-92 where complete identity was established.

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Issues: (i) Whether the assessee's interest income satisfied the principle of mutuality when members who contributed deposits were not necessarily the same persons who borrowed and participated in the surplus; (ii) whether the amended rule governing distribution of surplus could operate retrospectively; (iii) whether interest paid on members' deposits was deductible and whether mutuality was established for the assessment year 1991-92.

Issue (i): Whether the assessee's interest income satisfied the principle of mutuality when members who contributed deposits were not necessarily the same persons who borrowed and participated in the surplus.

Analysis: The governing test is complete identity between those who contribute to the common fund and those who participate in the surplus generated from that fund. Membership alone does not satisfy the test if the income is derived from lending to only some members while the surplus is distributable to all members, including those who did not participate in the transactions producing the income. The fact that depositors and borrowers may overlap does not remove the want of identity in relation to the interest income.

Conclusion: The principle of mutuality was not satisfied, and the assessee's claim failed on this issue, in favour of the Revenue.

Issue (ii): Whether the amended rule governing distribution of surplus could operate retrospectively.

Analysis: A later amendment to the rules of an unincorporated body cannot be used after the event to alter the terms on which earlier transactions were carried on, especially where the object is to avoid tax liability. Such an amendment can take effect only prospectively.

Conclusion: The amended rule could not be given retrospective effect, and this issue was decided against the assessee.

Issue (iii): Whether interest paid on members' deposits was deductible and whether mutuality was established for the assessment year 1991-92.

Analysis: Interest paid on deposits was an allowable business expenditure in computing profits. On the facts applicable after the amendment, there was complete identity between contributors and participators for the assessment year 1991-92, so the mutuality doctrine applied for that year.

Conclusion: The deduction of interest was allowable and mutuality was recognised for the assessment year 1991-92, in favour of the assessee.

Final Conclusion: The reference was answered partly against the assessee on the earlier assessment years and partly in its favour for the later year, with the amendment held to be prospective only and the doctrine of mutuality confined to the year where complete identity was established.

Ratio Decidendi: Mutuality exists only where there is complete identity between contributors to the common fund and participators in the surplus derived from it, and a later rule cannot retrospectively alter the tax character of earlier completed transactions.

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