The Directorate General of GST Intelligence (DGGI) is investigating about a dozen casinos in Goa and Sikkim, alleging ₹10,000 crore in tax avoidance, CNBC-TV18 reported. The probes are reportedly centred on the wrongful payment of GST at a lower rate of 18% instead of the mandated 28% as well as the misuse of Input Tax Credit (ITC) through fraudulent claims.