In January 2019, the secretary of a housing cooperative society in Pune’s Kothrud neighbourhood opened a tax demand notice for ₹3.8 lakh. Her society had collected monthly maintenance from 84 flat-owners for years — money that everyone understood moved from residents to the collective and straight back out as building services. Nobody had imagined it as a “supply of services.” Nobody had thought they needed a GST registration number. That envelope was the moment I first understood how completely the new tax architecture had unsettled India’s cooperative sector.