Every entity whose taxable supply of Goods or Services or both exceeds the threshold limit has to be registered for GSTIN.
Following is the aggregate turnover limit for any business entity to get registered under GST:
For Supply of Goods:
Normal Category States - If Aggregate turnover exceeds ₹ 40 Lakhs
Special Category States (North east states) - If Aggregate turnover exceeds ₹ 20 Lakhs
For Supply of Services:
Normal Category States - If Aggregate turnover exceeds ₹ 20 Lakhs
Special Category States (North east states) - If Aggregate turnover exceeds ₹ 10 Lakhs