GST transition powers under Section 19 allowed limited amendments, but post-regime VAT amendments without competence were invalid.

Section 19 of the Constitution (One Hundred and First Amendment) Act, 2016, read with Article 246A, preserved existing tax laws during the GST transition and also allowed competent legislatures to amend or repeal them within that limited window, including curative or validating changes; that power was not confined to mere textual conformity with the amended Constitution. Once the GST regime commenced and the legislative field had shifted, however, later amendments to the erstwhile VAT laws could not be sustained for want of competence. On that basis, the Telangana validating amendment, the Gujarat retrospective amendment, and the Maharashtra mandatory pre-deposit amendment were all held invalid.

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Issues: (i) Whether Section 19 of the Constitution (One Hundred and First Amendment) Act, 2016, read with Article 246A, permitted the State Legislatures and Parliament to amend or repeal existing tax laws during the transitional period and whether that power was confined only to making such laws conform to the amended Constitution. (ii) Whether the Telangana amendment, introduced through and later enacted to replace an ordinance, was valid after the GST regime had come into force. (iii) Whether the Gujarat and Maharashtra VAT amendments made after 01.07.2017 could be sustained, including the retrospective validating provision in Gujarat and the mandatory pre-deposit amendment in Maharashtra.

Issue (i): Whether Section 19 of the Constitution (One Hundred and First Amendment) Act, 2016, read with Article 246A, permitted the State Legislatures and Parliament to amend or repeal existing tax laws during the transitional period and whether that power was confined only to making such laws conform to the amended Constitution.

Analysis: Section 19 was treated as a transitional constitutional provision operating for a limited period after the GST constitutional changes. It preserved existing laws until they were amended or repealed or until the prescribed period expired, and it also enabled competent legislatures to amend or repeal those laws. The amended constitutional scheme had removed the earlier taxing fields from the Seventh Schedule and introduced a new structure under Article 246A, so Section 19 and Article 246A had to be read together to avoid a legislative vacuum during the transition. The power to amend was not confined to merely making laws conforming to the amended text; it extended to necessary amendments, including curative or validating changes, within the transitional window.

Conclusion: The power under Section 19 was not restricted to formal alignment with the amended Constitution, and no such narrow limitation was accepted.

Issue (ii): Whether the Telangana amendment, introduced through and later enacted to replace an ordinance, was valid after the GST regime had come into force.

Analysis: The ordinance was initially promulgated while Section 19 was still operative, but the decisive question was the competence of the legislature when the ordinance was later approved and enacted. By then, the GST regime had commenced and the erstwhile field of legislation had been substantially altered. The later enactment could not be upheld merely because the ordinance had earlier existed; once the subject-matter competence had ceased, the approval of the ordinance could not revive it. The savings clause in the GST enactment did not cure a want of competence in the validating amendment.

Conclusion: The Telangana amendment was invalid and void for want of legislative competence.

Issue (iii): Whether the Gujarat and Maharashtra VAT amendments made after 01.07.2017 could be sustained, including the retrospective validating provision in Gujarat and the mandatory pre-deposit amendment in Maharashtra.

Analysis: The Gujarat amendment inserting Section 84A was enacted after the GST regime had already commenced and sought retrospectively to reopen concluded matters by excluding periods spent in litigation. Since the relevant legislative field had already shifted and the transitional window had closed, the amendment could not be justified under Section 19. It also offended the constitutional standards against arbitrary retrospective reopening of finalised assessments. In Maharashtra, the amendments imposing a mandatory pre-deposit for appeals were also introduced after the new regime had commenced, when competence to amend the erstwhile VAT law in the manner adopted had ceased. The retrospective form could not cure the absence of legislative power at the time of enactment.

Conclusion: The Gujarat amendment was void and the Maharashtra amendment requiring pre-deposit was also void.

Final Conclusion: The transitional constitutional arrangement was upheld, but the post-GST VAT amendments in Telangana and Gujarat were invalid, and the Maharashtra amendment was also struck down.

Ratio Decidendi: A transitional constitutional provision that continues existing laws during a constitutional overhaul also preserves a limited power to amend or repeal those laws within the transition period, but once the new regime commences and the legislative field is altered, later amendments beyond that competence are void.

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