Penal interest GST treatment clarified: penal interest treated as covered under notification, not taxable in the example. Corrigendum amends paragraph 5 of Circular No. 57/2019 GST to state that the penal interest charged on a transaction between Y and M/s ABC Ltd. would not be subject to GST because it would be covered under Notification No. 12/2017 State Tax (Rate); the illustrative value of supply of a mobile by X to Y remains Rs. 40,000/-.