Retrospective sales tax amendment struck down as an unreasonable restriction on constitutional business rights.

A retrospective amendment to the definition of "business" under the Bengal Finance (Sales Tax) Act was examined for constitutional validity. The court treated retrospective fiscal legislation as permissible in principle, but held that a fresh tax imposed for the first time on past transactions over an exceptionally long period, without a temporal limit and with practical hardship for dealers, amounted to an excessive and disproportionate restriction on Article 19(1)(f) and (g) rights. The same retrospectivity was not discriminatory under Article 14 because no hostile classification was shown. It also did not attract Article 20, as deeming tax liability backward could not create retrospective penal liability for non-registration.

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Issues: (i) whether the retrospective operation given to the amended definition of "business" in section 2(1a) of the Bengal Finance (Sales Tax) Act, 1941, by section 4 of the West Bengal Taxation Laws (Amendment) Act, 1969, was invalid as imposing an unreasonable restriction on the rights guaranteed by Article 19(1)(f) and (g) of the Constitution of India; (ii) whether the same retrospective operation offended Article 14 of the Constitution of India; and (iii) whether it offended Article 20 of the Constitution of India by exposing dealers to retrospective penal consequences.

Issue (i): whether the retrospective operation given to the amended definition of "business" in section 2(1a) of the Bengal Finance (Sales Tax) Act, 1941, by section 4 of the West Bengal Taxation Laws (Amendment) Act, 1969, was invalid as imposing an unreasonable restriction on the rights guaranteed by Article 19(1)(f) and (g) of the Constitution of India.

Analysis: Retrospective legislation is permissible, but its validity must be tested by the reasonableness of the restriction it places on protected rights. The impugned provision was not a mere validating enactment; it imposed a fresh tax for the first time on past transactions and extended back over an exceptionally long period. The inability of dealers to pass on the tax to buyers, the absence of any temporal limitation in the amendment, and the practical hardship caused by reopening old transactions were all relevant to the assessment of reasonableness. On that basis, the retrospective levy was treated as excessive and disproportionate.

Conclusion: The retrospective operation of the amended definition was unconstitutional as it violated Article 19(1)(f) and (g) of the Constitution of India.

Issue (ii): whether the same retrospective operation offended Article 14 of the Constitution of India.

Analysis: The retrospective provision did not create any hostile discrimination between similarly situated persons. The fact that only pending assessments could be affected while completed assessments remained undisturbed was treated as a fortuitous consequence of the stage of proceedings, not as a discriminatory classification. No unequal treatment founded on a constitutionally impermissible basis was shown.

Conclusion: The retrospective operation did not violate Article 14 of the Constitution of India.

Issue (iii): whether the same retrospective operation offended Article 20 of the Constitution of India by exposing dealers to retrospective penal consequences.

Analysis: The liability to register under the sales tax law did not arise during the earlier period when the transactions were not taxable. The deeming provision extending tax liability backward could not be expanded to create retrospective criminal liability for non-registration. A deeming fiction is limited to the purpose for which it is created, and it could not be carried beyond that purpose to attract penal consequences for a time when the underlying liability did not exist.

Conclusion: The retrospective operation did not violate Article 20 of the Constitution of India.

Final Conclusion: The impugned retrospective taxation provision was struck down only to the extent that it imposed an unreasonable restriction on fundamental rights under Article 19(1)(f) and (g), while the challenges based on Articles 14 and 20 failed.

Ratio Decidendi: A retrospective fiscal amendment that imposes a fresh tax over an exceptionally long past period may be invalid if, on the facts, it imposes an unreasonable restriction on fundamental rights; however, retrospective operation does not by itself amount to hostile discrimination or ex post facto penal legislation.

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