The Supreme Court struck down Rajasthan's 2007 VAT notification that gave a tax exemption to asbestos cement sheets and bricks manufactured within Rajasthan. The exemption was local-manufacture specific; it was Notification No. S.O.377 dated 09.03.2007, and the benefit applied to products with 25% or more fly ash. Similar goods brought from outside Rajasthan continued to face VAT, which could give local manufacturers a price and competition advantage.

The Court held that this exemption violated Article 304(a) of the Constitution. Article 304(a) allows a State legislature to tax goods imported from other States or Union territories, but only on the condition that similar locally manufactured goods are also subject to the same tax burden and that there is no discrimination between imported and local goods. The decision therefore goes beyond a narrow tax dispute: it connects Rajasthan's fiscal policy with India's common market, Article 301's freedom of trade, commerce and intercourse, and the constitutional check on protectionist state taxation.

For RAS and UPSC preparation, the case shows where limits on State taxation are drawn within Centre-State economic relations and federalism. The exam takeaway is that States may design tax policy to support local economic goals, but they cannot create a fiscal barrier that discriminates against similar goods from other States. In static GK, link it with Part XIII of the Constitution, Articles 301 to 304, and the principle that taxation power must be exercised without hostile discrimination against inter-state commerce.