Can input tax credit be claimed on the GST paid for Zerodha's service?

Yes, the input tax credit for the GST paid for Zerodha's services can be claimed if the following conditions are met:

1. The trading services are used for business purposes, not by an end-user (retail investor).
2. The GST registration is linked to the same PAN as the demat account.

To include the GST number on the contract note and other invoices from Zerodha, please provide the GST registration certificate by creating a ticket. To know the steps to download the GST invoice, see How to download the GST invoice for the charges posted on the funds statement?