Goods and Services Tax (GST) is an indirect tax levied on supply of goods and services and it replaces multiple cascading taxes levied by the central and state governments. Any business entity whose turnover exceeds the threshold limit need to register under GST. A dealer can obtain the GSTN registration as ‘Regular’ or ‘Composition’ type depending upon the turnover in a year. A regular dealer can collect tax from the customer whereas a composition dealer is not supposed to collect any tax from the customer. However, it was observed that few dealers not having a valid GSTN registration and few composition dealers were collecting tax from the citizens. On the request of the State Goods & Services Tax Department, NIC Kerala has developed Kerala GST mobile application which facilitates citizens to check whether a dealer is having a valid GSTN registration and if so, the type of GSTN registration. Through this App, a citizen can also verify whether the dealer can collect tax from the public.