In case of any changes to the principal place of business, GST Form REG-14 can be filed for GST address change online. However, you need to keep yourself assured that the new address and old address are in the same State or UT. This is because GST is State-based Registration. If the new address is in a new state, then you need to cancel the old registration and obtain a new one in another state. For GST change of address, proof of address for the new location must be provided in the GST registration amendment application. All the changes to the address recorded in the GST common portal must be updated within 15 days on the occurrence of the event of a change in the address by filing a GST Amendment Application. On making an application for a change of GST address, the GST office would approve the change within 15 days.On approval, the amendment shall take effect from the date of occurrence of the event warranting the amendment.