Retrospective tax expansion on past business transactions was held unconstitutional for unreasonable burden and penal exposure.

Retrospective enlargement of the definition of "business" under the Bengal Finance (Sales Tax) Act, 1941 was treated as a fresh imposition on past transactions rather than a mere validation of an existing levy. The amendment removed profit motive and brought in ancillary or incidental transactions, thereby widening the tax base and creating unexpected liability for prior conduct. That retrospective burden was held to be unreasonable under article 19(1)(f) and article 19(1)(g), not saved by article 19(5) or article 19(6). The same deeming effect also exposed past transactions to registration and penal consequences, which was held inconsistent with article 20.

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Issues: (i) Whether section 2(1a) of the Bengal Finance (Sales Tax) Act, 1941, as given retrospective effect by section 4 of the West Bengal Taxation Laws (Amendment) Act, 1969, imposed an unreasonable restriction on the fundamental rights guaranteed by article 19(1)(f) and article 19(1)(g) of the Constitution of India; (ii) whether the retrospective operation of the said provision offended article 20 of the Constitution of India.

Issue (i): Whether section 2(1a) of the Bengal Finance (Sales Tax) Act, 1941, as given retrospective effect by section 4 of the West Bengal Taxation Laws (Amendment) Act, 1969, imposed an unreasonable restriction on the fundamental rights guaranteed by article 19(1)(f) and article 19(1)(g) of the Constitution of India.

Analysis: The amendment widened the definition of business by removing profit motive as an essential element and by including transactions ancillary or incidental to trade, commerce or manufacture. The retrospective operation did not merely validate an existing levy or cure a defect in administration, but enlarged the tax base so as to fasten liability for the first time on past transactions which were not taxable when entered into. In the circumstances, the burden was held to be excessive and unexpected, and the inability to pass on the tax or comply with the registration consequences was treated as material in judging reasonableness under article 19(5) and article 19(6).

Conclusion: The retrospective operation of section 2(1a) was held to be unconstitutional as offending article 19(1)(f) and article 19(1)(g) and not saved by article 19(5) or article 19(6).

Issue (ii): Whether the retrospective operation of the said provision offended article 20 of the Constitution of India.

Analysis: The retrospective expansion of the definition of business had the effect of exposing past transactions to the registration requirement and to penal consequences under the Act, although those transactions were not taxable when they were effected. Since article 20 forbids conviction or penalty for conduct that was not an offence under the law in force at the relevant time, the retrospective deeming provision was inconsistent with that protection.

Conclusion: The retrospective operation of section 2(1a) was also held to offend article 20 of the Constitution of India.

Final Conclusion: The tax demands based on the retrospective enlargement of the definition of business could not stand, and the orders taxing the disputed sales were quashed to that extent.

Ratio Decidendi: A retrospective fiscal amendment that enlarges the taxable field for the first time, rather than merely curing a defect or validating an existing levy, may be struck down if it imposes an unreasonable and unforeseeable burden on past transactions and exposes prior conduct to penal consequences contrary to constitutional protections.

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