Illegal speculative losses cannot be set off against other business income unless statutory set-off conditions are satisfied.

Illegal speculative losses may be deducted only in computing the profits of the same business under section 10(1), because that provision recognises real business income after accounting for losses actually incurred. The Gujarat HC held that the Supreme Court ruling in S. C. Kothari did not authorise a general set-off of such losses against other business income. A claim for cross-set-off was therefore unsustainable merely because the assessee carried on both lawful and unlawful activities in the same business structure. The assessee was not entitled to set off the illegal speculative losses against other business income.

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Issues: Whether losses arising from illegal forward speculative transactions can be set off against other business income of the assessee.

Analysis: The Court examined the scope of the Supreme Court decision in S. C. Kothari and held that its ratio did not authorise a general set-off of illegal speculative losses against any other business income. The decision only recognised that, for purposes of computing business profits under section 10(1), losses actually incurred in the same business may be deducted to arrive at real taxable income. The Court further held that the assessee's claim to set off such losses against other business income could not be sustained merely because the transactions were part of a business carrying on both legal and illegal activities.

Conclusion: The assessee was not entitled to set off the illegal speculative losses against other business income.

Ratio Decidendi: Illegal speculative losses may be deducted only in computing profits of the same business under section 10(1), but they cannot be set off against other business income under section 24(1) unless the statutory conditions for such set-off are satisfied.

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