Off Login to https://selfcare.actcorp.in with your User ID/ Registered Mobile NumberClick on My Account on the top right of the screen.On the Left side of the screen select the sub menu \"GST UPDATE \""Select the stateEnter the GST numberUpload the GST Certificate by using \"" BROWSE \"" option.Confirm by clicking on \""Proceed\""The GST details which is uploaded will reflect on your next Invoice.** Please note that we will not be able to generate back dated Invoices." FAQ sub cat Account