Magento 2 module for GST configuration [India]
comopser require magento-garage/m2-gst-india
You'll get a button Configure GST in Store > Configuration > General > Store Information
You'll need to select Country -> India and Region for store.
Your selected region will be base state which will be eligible for CGST/SGST and all other states will be having IGST tax rates configured.
- Only use this button once. (yet to make it reusable.)
- Delete existing tax rates, tax rules and tax classes to use this button again.