Mutuality in member-funded facilities applies to surplus contributions, but interest from third-party deposits falls outside the doctrine.

The doctrine of mutuality applies where an association is formed exclusively for members, contributions come only from members, and funds are applied only to the common object; on that basis, surplus arising from member contributions to operate a common effluent treatment facility retains the character of mutual receipts and is not taxable. Interest earned on bank fixed deposits and other third-party deposits does not satisfy the identity between contributors and participators, because it arises from an arm's length banking relationship rather than from members; such interest falls outside mutuality and is taxable as income from other sources. Taxability of interest on other deposits and income-tax refunds was left for reconsideration.

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Issues: (i) Whether the surplus of contributions over expenditure received from members for operating the common effluent treatment facility was exempt on the principle of mutuality; (ii) Whether interest earned on bank fixed deposits, other deposits and income-tax refunds was exempt on the principle of mutuality.

Issue (i): Whether the surplus of contributions over expenditure received from members for operating the common effluent treatment facility was exempt on the principle of mutuality.

Analysis: The Association was formed exclusively for its members to provide a common effluent treatment facility, and the receipts representing contributions came only from members. The funds were applied only for the objects of the Association, and there was complete identity between contributors and participators. Applying the settled doctrine of mutuality, surplus arising from member contributions, by itself and excluding interest income, retained the character of mutual receipts.

Conclusion: Yes. The surplus of member contributions over expenditure was exempt on the principle of mutuality and was not exigible to tax.

Issue (ii): Whether interest earned on bank fixed deposits, other deposits and income-tax refunds was exempt on the principle of mutuality.

Analysis: Interest on deposits is received from banks or other third parties and not from the members who contribute to the common fund. Even if the deposited money originated from member contributions, the receipt of interest arises from an arm's length transaction with a banker and customer relationship, which lacks the essential identity required for mutuality. Such interest therefore bears the character of income from an outside source and falls outside the mutual arrangement.

Conclusion: No. Interest on bank fixed deposits was not covered by mutuality and was taxable as income from other sources.

Final Conclusion: The doctrine of mutuality applied to the surplus from member contributions, but not to interest earned from outside deposits. The taxability of interest on other deposits and income-tax refunds was left for fresh decision by the Tribunal.

Ratio Decidendi: Mutuality protects only receipts arising from transactions between the same contributors and participators; interest earned from third-party deposits does not satisfy that test even if the deposited funds originated from members' contributions.

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