Retrospective delegated rule-making and limited sub-delegation under sales tax law were held valid within statutory limits.

Rule 205 of the West Bengal Sales Tax Rules, 1995 was upheld against challenge for permitting the Commissioner to authorise another officer in writing and for operating retrospectively. The parent Act expressly allowed rules with prospective or retrospective effect, and no existing right was shown to have been unlawfully taken away or a new liability imposed impermissibly. The provision was also held intra vires the West Bengal Sales Tax Act, 1994 because the delegation was limited and controlled, confined to penalty proceedings for non-issue of cash memos or bills, and did not violate delegatus non potest delegare.

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Issues: (i) Whether rule 205 of the West Bengal Sales Tax Rules, 1995, including the Explanation inserted by notification, was invalid for permitting the Commissioner to authorise another officer and for giving retrospective effect. (ii) Whether the impugned provision was ultra vires the West Bengal Sales Tax Act, 1994, or offended the doctrine of delegatus non potest delegare.

Issue (i): Whether rule 205 of the West Bengal Sales Tax Rules, 1995, including the Explanation inserted by notification, was invalid for permitting the Commissioner to authorise another officer and for giving retrospective effect.

Analysis: The parent Act expressly empowered the State Government to make rules with prospective or retrospective effect. The Explanation to rule 205 merely enabled the Commissioner to authorise another officer in writing for the limited purpose contemplated by the rule. The Court found no legal infirmity merely because the provision operated retrospectively, since no existing right was shown to have been taken away or any new liability imposed in an impermissible manner.

Conclusion: The challenge on the ground of retrospective operation failed, and the Explanation was held valid.

Issue (ii): Whether the impugned provision was ultra vires the West Bengal Sales Tax Act, 1994, or offended the doctrine of delegatus non potest delegare.

Analysis: The doctrine prevents re-delegation unless the statute permits it expressly or by necessary implication. Here, the statutory scheme allowed rule-making by the State and delegation by the Commissioner under prescribed limits. The authorised officer under rule 205 was treated as acting only for the restricted purpose of penalty proceedings relating to non-issue of cash memos or bills, and this was not found to conflict with the definition of appropriate assessing authority under rule 2(1)(c).

Conclusion: Rule 205 was held intra vires the Act and not hit by the doctrine of delegatus non potest delegare.

Final Conclusion: The legal challenge to the impugned rule failed in substance, and the question of law was answered against the applicant.

Ratio Decidendi: Where the parent statute authorises retrospective rule-making and the delegated power is used for a limited and controlled purpose, subordinate legislation permitting written authorisation by the Commissioner is valid and does not constitute impermissible sub-delegation.

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