How to Change Mobile Number and Email ID in GST Portal Login

Tallysolutions

Tally Solutions

Updated on Apr 23, 2026

Mobile number and email ID entered in the GST portal is of utmost importance for a registered person, as all notifications with respect to the GST portal will be communicated to the mobile number and email ID specified. Many taxpayers want to know how to change mobile number in GST Registration as well as how to change the e-mail ID in GST Registration as specified in the portal.

How to update e-mail ID and phone number in GST portal

Let us understand the process for this:

1. Login to the GST portal login with your username and password.

2. Click Services>Registration>Amendment of registration Non-core fieldsgoods and services

 

3. The tabs for editing will display. Click the Authorised Signatory

authorised signatory

 

4.The current authorised signatory will be displayed. Click Add New.

authorised signatory add new

 

5. Specify the details, including the new mobile number and email ID of the signatory. Click the ‘Save’ button to save the details.

save

 

6. Click the Verification
Verification tab

a. Tick the Verification checkbox

Verification checkbox

b. In the Name of Authorized Signatory drop-down list, select the authorized signatory.
c. In the Place field, enter the name of the place.
d. Select the relevant option to digitally sign the application using Digital Signature Certificate (DSC) or E-Signature or EVC.

DSC

7. On submission of the application for correction in GST registration, a message of successful submission of application will be displayed.  You will receive an acknowledgement within 15 minutes on the old e-mail address and mobile number.
8. Once the acknowledgment is received or after 15 minutes of submission of application for amendment, login to the GST portal again.
9. Select the Authorised Signatory tab again.
10. Deselect the Primary authorized signatory checkbox for the old signatory and select the newly added signatory as the Primary authorized signatory.
11. Verify the mobile number and email ID mentioned for the newly added signatory and ensure that it is correct.
12. Click the Verification tab and submit the application using DSC/E-Signature/EVC.
13. After submission of the application, you will receive an acknowledgment within 15 minutes on the new email address and mobile number.

Hence, change of mobile number and change of email ID in Goods and Service Tax portal can be done easily, without the approval of an assessing officer or a visit to the Government office.

Common Errors While Changing Mobile Number in GST Portal

While updating your mobile number on the GST portal, users may face common issues such as incorrect OTP entry, mismatch between registered PAN details and GST records, inactive or unreachable mobile number, and delays in OTP delivery. Errors can also occur if the authorized signatory details are outdated or if the Digital Signature Certificate (DSC) is not properly configured. Ensuring accurate details and a stable network connection can help avoid these issues.

How Long Does It Take to Update Mobile Number in GST?

Updating the mobile number on the GST portal is usually a quick process and can be completed instantly after OTP verification. In most cases, the change reflects immediately once the request is successfully submitted and verified. However, in rare situations, it may take a few hours due to system processing or verification delays.

GSTIN

GST portal services

GST registration status

MFA on GST portal

Read more on DSC, E-sign, and EVC

FAQs

Yes, you can change your mobile number in GST completely online through the GST portal. There is no need to visit a tax office. The update can be done using OTP verification or DSC through your GST login.

Updating the mobile number and email ID in GST is usually instant after OTP verification. In most cases, the changes reflect immediately, though it may take a few hours in rare cases due to system processing.

To update your mobile number or email ID, you need: GST login credentials Access to existing registered mobile/email (for OTP verification) Authorized signatory details DSC (if applicable)

Yes, the GST portal allows you to update both mobile number and email ID together in a single request. Both changes must be verified using OTP authentication.

If you do not update your mobile number: You may miss important GST alerts and notifications OTP-based verification for returns and filings may fail Compliance processes can become difficult

Published on October 24, 2017

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