Karnataka High Court Quashes Rs. 124 Crore GST Demand: Solar Inverters Qualify for 5% Concessional Rate as Integral System Components

The classification of goods under the Goods and Services Tax (GST) framework often leads to complex interpretive battles between the revenue authorities and the assessee. A prominent instance of such a dispute was recently resolved by the Hon'ble Karnataka High Court in the landmark case of ABB India Limited Vs Joint Commissioner. The judicial ruling provides critical clarity on the taxation of renewable energy components, specifically solar inverters, by affirming their eligibility for a concessional GST rate of 5%.

This comprehensive summary breaks down the factual matrix, the legal arguments presented by both sides, the judicial precedents relied upon, and the final verdict delivered by the High Court.

The assessee, ABB India Limited, is a corporate entity primarily engaged in the production and distribution of industrial electronic controllers, switchgears, drives, and various electrical accessories. During the disputed financial periods, the assessee supplied solar inverters, which they classified under Chapter 85 of the Harmonized System of Nomenclature (HSN).

The assessee applied a concessional GST rate of 5% on these supplies, relying on Entry 234 of Notification No. 1/2017-CT (Rate) dated 28.06.2017. This specific entry offers a reduced tax rate for renewable energy devices and parts used in their manufacture, including solar power-generating systems.

However, the revenue department initiated audit inquiries and subsequently issued show-cause notices under Section 73 of the KGST Act. The tax authorities argued that the inverters supplied by the assessee should be classified as "general electrical devices" under Chapter Heading 8504. Consequently, the department proposed a standard GST levy of 18%, rejecting the 5% concessional rate.

The revenue's stance led to the passing of original orders confirming massive tax demands, which were later upheld by the appellate authorities. Aggrieved by these orders, the assessee approached the Karnataka High Court by filing three separate writ petitions covering different financial periods:

  1. W.P.No.9686/2025: Pertaining to the period from July 2017 to March 2018, challenging an appellate order dated 29.01.2025, with a total tax demand of Rs. 37,10,20,536/-.
  2. W.P.No.11788/2025: Pertaining to the period from April 2018 to March 2019, challenging an appellate order dated 28.02.2025, with a total tax demand of Rs. 61,37,04,338/-.
  3. W.P.No.16708/2025: Pertaining to the period from April 2019 to March 2020, challenging an appellate order dated 27.03.2025, with a total tax demand of Rs. 25,77,96,388/-.

Core Contentions of the Assessee

The assessee presented a robust defense against the 18% tax levy, structuring their arguments around the functional necessity of the inverters and the statutory interpretation of the exemption notification.