Input tax credit reversal and retrospective tax amendment were tested under VAT law, with invoice price and prospective operation upheld.

Input tax credit under the VAT scheme was a statutory concession, so the purchase price for reversal under Section 19(20) had to be the invoice price shown in the tax invoice, not a later net price after discount; the interpretation was decided against the assessee. Section 19(20) was also held constitutionally valid because the Legislature could regulate concessionary credit to protect revenue and curb misuse, and no violation of Articles 14 or 19(1)(g) was shown. However, although fiscal amendments may be retrospective, this provision could not validly operate from 01.01.2007 because it imposed a new burden affecting past credit positions without sufficient justification; retrospective effect was struck down in favour of the assessee.

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Issues: (i) Whether, for the purpose of reversal of input tax credit, the "price" of purchased goods under Section 19(20) had to be taken as the invoice price or the net price after discount. (ii) Whether Section 19(20) of the Tamil Nadu Value Added Tax Act, 2006 was constitutionally valid. (iii) Whether the retrospective operation of Section 19(20) from 01.01.2007 was sustainable.

Issue (i): Whether, for the purpose of reversal of input tax credit, the "price" of purchased goods under Section 19(20) had to be taken as the invoice price or the net price after discount.

Analysis: Input tax credit under the VAT scheme was treated as a statutory concession, not an inherent right. The scheme of Section 19 made the original tax invoice central to the claim of credit, and the statutory framework required the dealer to establish the tax paid on purchases through that invoice. In that context, the "price" relevant for Section 19(20) was the price shown in the tax invoice, not a later net price derived by deducting a subsequent credit note. General principles under the Sale of Goods Act could not override this specific statutory scheme governing input tax credit.

Conclusion: The issue was decided against the assessee and the invoice price was held to be the relevant purchase price.

Issue (ii): Whether Section 19(20) of the Tamil Nadu Value Added Tax Act, 2006 was constitutionally valid.

Analysis: The provision operated within a fiscal regime that granted concessionary input tax credit subject to legislative conditions. The Court accepted that the Legislature had power to regulate the form and manner of such concession, and that Section 19(20) was enacted to protect revenue and curb misuse through inflated invoices followed by discounts that reduced output tax. In fiscal matters, wide latitude is allowed to the Legislature, and a challenger must show clear constitutional infringement. No such violation was established under Articles 14 or 19(1)(g) of the Constitution of India.

Conclusion: The constitutional validity of Section 19(20) was upheld against the assessee.

Issue (iii): Whether the retrospective operation of Section 19(20) from 01.01.2007 was sustainable.

Analysis: Although fiscal statutes may operate retrospectively, such operation must not be unduly oppressive, confiscatory, or otherwise unreasonable. Section 19(20) introduced a new rule for determining input tax credit in cases where goods were sold below purchase price, and it altered the credit position to the detriment of dealers for a past period during which the earlier scheme had already created vested rights. The Court found no sufficient justification for confining the burden to the retrospective period and held that the amendment, though valid prospectively, could not be given retrospective effect from 01.01.2007.

Conclusion: The retrospective operation was struck down in favour of the assessee.

Final Conclusion: The provision was upheld on interpretation and constitutional validity, but its retrospective application was invalidated, leaving the amendment effective only prospectively.

Ratio Decidendi: A fiscal concession governed by a specific statutory scheme must be construed strictly according to that scheme, but a new tax burden affecting vested rights cannot be imposed retrospectively unless the retrospective operation is clearly justified and withstands constitutional scrutiny.

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