Asia Sugar and Chemical Co., Devangere v. The State of Karnataka
Background
Under the Karnataka Sales Tax Act, "sugar" was listed as a tax-exempt commodity, and for years the tax department itself treated imported sugar as covered by this exemption, including for the appellant traders who dealt in imported sugar between 1994 and 1996. In 2001, the Karnataka legislature amended the law to add the words "produced or manufactured in India" after "sugar", and, crucially, declared this change effective retrospectively, as if it had always been part of the law. Based on this retrospective amendment, the tax department reopened old, already-completed assessments and demanded years of back taxes, penalty, and interest on the assessees' past imported-sugar sales, even though they had never collected any tax from their customers for those transactions.
Decision Breakdown
The Supreme Court first held that, before the 2001 amendment, the plain wording of the exemption entry covered imported sugar as well as domestic sugar: the department's own past practice of granting the exemption confirmed this understanding. It then held that the 2001 amendment, though a genuine and substantive change (not a mere clarification), was still within the state legislature's constitutional power to enact retrospectively, since the power to tax includes the power to grant and withdraw exemptions. However, the Court held that enforcing this retrospective change without limits would be unfair to businesses who had relied on the exemption for years and never collected tax from buyers, so while it allowed the department to recover the principal tax now due, it barred any penalty for the pre-2001 period and ruled that interest could only run from the date of the fresh demand after this judgment, not from the original 1990s transactions.
Lesson Learnt
A legislature can validly change tax law retrospectively and withdraw an exemption people had relied on for years, but courts can still step in to prevent that retrospective change from being applied punitively, through penalties or backdated interest, against those who acted honestly under the law as it stood at the time.