Supreme Court Settles 'Tax on Tax' Debate: Unpacking Decades of Federal Fiscal Contention

What was the core legal question before the Supreme Court?

Last week, a seven-judge Constitution Bench of the Supreme Court closed a reference that had been pending for approximately three decades, addressing the fundamental question of whether states could impose a surcharge on sales tax. The central legal dispute revolved around whether such a levy constituted an impermissible 'tax on tax' or merely an additional component of the existing sales tax (Indian Express, November 10, 2026). This issue originated from a 1990 amendment to Odisha’s Sales Tax Act, which mandated dealers with a gross turnover exceeding Rs 10 lakh to pay an additional 10% of the sales tax they already owed. Dealers challenged this provision, arguing that the surcharge, being measured on the tax payable rather than on turnover, was not a tax on the 'sale or purchase of goods' and therefore fell outside the legislative competence granted to states under Entry 54 of List II of the Seventh Schedule (Indian Express, November 10, 2026). The state of Odisha, conversely, maintained that the surcharge was simply an increase in the rate of sales tax for a specific class of dealers, asserting that the method of calculation (as a percentage of tax payable) did not alter the fundamental nature of the levy as a sales tax (Indian Express, November 10, 2026).

How did previous Supreme Court rulings shape the debate?

The legal landscape surrounding surcharges on sales tax was shaped by multiple Supreme Court pronouncements over the decades. In S. Kodar v. State of Kerala (1974), a five-judge Constitution Bench upheld a Tamil Nadu law that imposed an additional tax of 5% on the sales tax payable by dealers whose annual turnover exceeded Rs 10 lakh. The Court ruled that this levy was an increase in sales tax, not a separate tax on income, stating that "the fact that quantum of additional tax is determined with reference to the sales tax imposed would not alter its character" (Indian Express, November 10, 2026). This position was reaffirmed in the Hoechst Pharmaceuticals (1983) ruling, where a three-judge bench upheld a 10% surcharge on sales tax for dealers with an annual turnover exceeding Rs 5 lakh, characterizing a surcharge as "nothing but a higher rate of tax to raise revenue for general purposes" (Indian Express, November 10, 2026).