Imports of goods and services are treated as inter-state supplies and therefore IGST will be levied on the import. The incidence of tax will follow the destination principle and the tax revenue in case of SGST will be accrued to the State where the imported goods and services are consumed. Full and complete set-off will be available on the GST paid on import on goods and services.
In general, the supplier of goods or services is liable to pay GST. However, in specified cases like imports and other notified supplies, the liability may be cast on you as the recipient under the reverse charge mechanism. Please note that import purchases will be captured in GSTR-3B in Column 5 - Goods/capital goods received from overseas (Import of goods).
For more information, you can refer to the linked document.