Suo moto proceedings may have been initiated by a tax authority to terminate a taxpayers GST registration. By using the GST portal, the aggrieved taxpayer can request the revocation or reinstatement of the cancelled GST registration. In this article information on How to Revoke cancelled GST Registration.. And other information on Revocation of Cancellation of GST Registration. A taxpayer whose GST registration has been cancelled by the proper authorities can ask to have it reversed by submitting Form GST REG-21. This application must be submitted within 30 days of receiving the notice of GST registration cancellation. It should be emphasised that an application for revocation can only be made in the event that the proper authority has terminated the registration on his own initiative. As a result, when a taxpayer voluntarily cancels his or her GST Registration, revocation cannot be used.