How to Update Mobile Number on GST Portal in India

Keeping your registered mobile number updated on the GST Portal is important for every taxpayer, business owner, proprietor, partnership firm, company, and other registered person in India. The mobile number registered with the Goods and Services Tax (GST) system is used for important communications, verification, authentication, and notifications related to GST compliance.

If your business has changed its mobile number, the authorised signatory has changed, you no longer have access to the registered number, or the number was entered incorrectly during GST registration, you may need to update the mobile number associated with your GST registration. Fortunately, the GST Portal provides a mechanism through which taxpayers can update certain registration details online.

This comprehensive guide explains how to update your mobile number on the GST Portal in India, who can update it, what documents may be required, how the amendment process works, what happens when you do not have access to the old mobile number, and common issues that taxpayers may encounter during the process.

Why Is the Mobile Number Registered on the GST Portal Important?

The mobile number linked with your GST registration is an important contact detail for your business. GST-related communications may be sent to the registered contact details of the taxpayer, authorised signatory, or other relevant persons associated with the registration.

A valid mobile number can help you receive one-time passwords (OTPs), alerts, notifications, reminders, and other communications connected with your GST account and compliance activities.

For businesses, maintaining accurate contact information is particularly important because GST compliance can involve regular filing, notices, registration amendments, authentication, and communication with the tax authorities.

If the registered mobile number belongs to an employee or former consultant who is no longer associated with the business, it is advisable to review and update the relevant GST registration details.

Can You Change the Mobile Number on the GST Portal?

Yes, GST registration details can be amended when there is a change in relevant registration information. The exact process depends on which mobile number needs to be changed and how the number is recorded in the GST registration profile.

GST registration contains different types of information, including details relating to the business, promoters or partners, authorised signatories, principal place of business, additional places of business, bank accounts, and other registration particulars.

Therefore, before attempting to change a mobile number, it is important to identify whose mobile number needs to be updated. For example, the mobile number of an authorised signatory may be different from the contact details of a proprietor, partner, director, or other person associated with the registration.

When Should You Update Your GST Mobile Number?

You should consider updating the mobile number on your GST registration when the existing number is no longer being used by the business or the concerned authorised person.

Common situations include:

• The business has changed its official contact number.
• The proprietor has changed their mobile number.
• A partner or director's contact details have changed.
• An authorised signatory has left the organisation.
• The GST registration contains an incorrect mobile number.
• The mobile number belongs to an accountant or consultant who is no longer handling GST work.
• The business wants GST-related communication to reach a new authorised person.
• The registered mobile number has been lost or deactivated.
• The taxpayer has changed their business contact information.

Keeping GST registration details current can help reduce communication problems and make GST compliance easier to manage.

How to Update Mobile Number on GST Portal

The GST Portal allows registered taxpayers to manage and amend eligible registration details online. The general process involves logging into the GST Portal, accessing the amendment functionality, identifying the relevant registration information, updating the mobile number, completing authentication, and submitting the amendment application.

The following steps provide a practical overview of the process.

Step 1: Visit the GST Portal

Start by accessing the official GST Portal used for GST registration and compliance services.

Use the official GST website rather than third-party websites that claim to provide GST login services. Be careful when entering your GST username, password, OTP, or other confidential information.

Step 2: Log in to Your GST Account

Enter your GST Portal username and password and complete the required login process.

If additional authentication is requested, complete the applicable verification step. Make sure that you have access to the contact details and credentials required for authentication.

Step 3: Open the Registration Amendment Section

After logging in, navigate to the section related to registration services and amendment of registration details.

The GST Portal provides functionality for taxpayers to amend information associated with their registration. Select the appropriate amendment option based on the type of information you need to change.

Step 4: Identify the Relevant Contact Details

GST registration may contain contact information associated with the taxpayer or authorised signatory. Review the registration details carefully before making changes.

If you are updating the mobile number of an authorised signatory, make sure that the correct person is selected and that the new number belongs to the person whose details are being updated.

Step 5: Enter the New Mobile Number

Enter the new mobile number carefully. Check every digit before proceeding because an incorrect mobile number can create additional authentication and communication problems.

It is advisable to use a mobile number that is regularly accessible to the proprietor, authorised signatory, or responsible person handling GST compliance for the business.

Step 6: Complete OTP Verification

Depending on the amendment and the information being changed, the GST Portal may require OTP verification.

Enter the OTP received on the applicable mobile number when prompted. If the OTP does not arrive immediately, check the mobile network and wait for a short period before requesting another OTP.

Do not share your GST OTP with unknown persons. OTPs should only be used by the taxpayer or authorised person for the intended GST transaction.

Step 7: Submit the Amendment Application

After entering the required information and completing applicable verification, review the amendment application carefully.

Check the mobile number, email address, authorised signatory information, and any other details included in the amendment before submission.

Once the information is correct, submit the amendment application using the applicable authentication method provided by the GST Portal.

Step 8: Track the Amendment Status

After submission, keep the acknowledgement or Application Reference Number (ARN), if generated.

The amendment application may be processed according to the applicable GST procedures. Taxpayers can use the GST Portal to check the status of the submitted application.

What If You Do Not Have Access to the Old Mobile Number?

This is one of the most common problems faced by taxpayers. For example, the mobile number originally provided during GST registration may belong to a former employee, accountant, consultant, or authorised signatory.

If you no longer have access to the old number, you should not attempt to bypass GST authentication or use another person's OTP without proper authorisation.

Instead, determine which registration detail needs to be amended and follow the applicable GST procedure for updating the authorised person's contact details.

In situations where online amendment cannot be completed because the existing mobile number is unavailable, professional assistance may be useful. A GST practitioner or tax professional can help identify the correct amendment route and documentation required for the specific registration.

Can the GST Login Mobile Number Be Different From the Business Mobile Number?

Yes, it is possible for different contact details to be associated with different people or functions within a business, depending on the information maintained in the GST registration.

For example, a company may have one mobile number associated with an authorised signatory while its general business contact number is maintained separately.

This distinction is important because simply changing a business contact number does not necessarily mean that every mobile number associated with GST registration has automatically changed.

Mobile Number of Authorised Signatory in GST Registration

The authorised signatory plays an important role in GST compliance. The authorised signatory may receive communications or be involved in GST-related authentication and filings.

If an authorised signatory leaves the company or is replaced, the business should review the GST registration and update the authorised signatory information as required.

For companies and other organisations, businesses should ensure that GST registration information remains aligned with their current authorised representatives.

What Documents Are Required to Change the GST Mobile Number?

The exact documentation required depends on the nature of the amendment and the circumstances of the taxpayer.

A simple contact detail amendment may not require the same documentation as a change involving the constitution of the business or authorised signatory.

Depending on the situation, relevant supporting information may include:

• GSTIN details.
• PAN details.
• Details of the proprietor, partner, director, or authorised signatory.
• Authorisation documents, where applicable.
• Supporting documents for changes in authorised signatory details, where required.
• Other documents requested by the GST Portal or tax authority.

Taxpayers should avoid uploading unnecessary documents. Documents should be clear, accurate, valid, and relevant to the amendment being requested.

How Long Does It Take to Update the Mobile Number on GST Portal?

The time required depends on the type of amendment and whether the change requires verification or approval.

Some updates may be reflected through the online system after successful authentication, while amendments requiring processing by the tax authority may take additional time.

Therefore, taxpayers should not assume that every GST registration amendment is updated instantly.

If an amendment application has been submitted, keep the ARN and monitor the application status through the GST Portal.

Common Problems While Updating Mobile Number on GST Portal

Taxpayers may encounter several technical or procedural issues while attempting to update GST registration information.

1. OTP Not Received

If the OTP is not received, check whether the mobile number has network connectivity and whether SMS services are active.

Also verify that the correct mobile number has been entered. Avoid repeatedly requesting OTPs within a very short period because multiple requests may create confusion over which OTP is currently valid.

2. Old Mobile Number Is Inaccessible

If the old number is no longer active, the standard online process may not work in the expected manner because authentication can depend on existing registration information.

In such cases, determine whether the number belongs to an authorised signatory whose details also need to be amended.

3. Incorrect Authorised Signatory Details

If the GST registration contains outdated authorised signatory information, simply changing the mobile number may not solve the underlying problem.

The business may need to update the authorised signatory details as part of the registration amendment.

4. GST Portal Technical Issues

Like any online system, the GST Portal can occasionally experience technical problems, maintenance, browser compatibility issues, or temporary service interruptions.

If a page is not loading correctly, try refreshing the browser, clearing browser cache, using a supported browser, or trying again later.

5. Incorrect Mobile Number Entered

A single incorrect digit can result in OTP delivery problems. Always review the number before submitting the amendment.

Important Precautions Before Changing Your GST Mobile Number

Before submitting a mobile number amendment, taxpayers should verify the following:

• The new mobile number is active.
• The number belongs to the appropriate proprietor, authorised signatory, or responsible person.
• The person has access to SMS and OTP messages.
• The GSTIN entered or selected is correct.
• The authorised signatory details are current.
• The email address registered with GST is also correct.
• Any required supporting documents are available.
• The amendment application is reviewed before final submission.

Why Businesses Should Keep GST Contact Details Updated

GST compliance involves several recurring responsibilities. Businesses may need to file GST returns, respond to notices, maintain invoices and records, manage tax payments, reconcile transactions, and comply with other applicable GST requirements.

Accurate contact information makes it easier for the responsible person to receive and respond to GST-related communications.

For businesses that have multiple employees or use external accountants, it is especially important to periodically review who has access to GST-related accounts and authentication information.

GST Mobile Number Change for Proprietorship Businesses

In a proprietorship, the proprietor is generally closely connected with the GST registration. If the proprietor changes their mobile number, the relevant GST registration contact information should be reviewed.

The proprietor should ensure that the new mobile number is active and accessible because it may be used for authentication and GST-related communication.

GST Mobile Number Change for Partnership Firms

For a partnership firm, the registration may contain details of partners and authorised persons. If the person responsible for GST compliance changes their mobile number, the firm should review the relevant registration details.

Where the authorised person itself has changed, the amendment may involve more than simply replacing the mobile number.

GST Mobile Number Change for Private Limited Companies

Companies should maintain accurate details of directors, authorised signatories, and other registration information on the GST Portal.

If an authorised signatory leaves the company, the company should update the GST registration appropriately rather than continuing to rely on the former signatory's mobile number.

Businesses should also establish internal controls to ensure that GST credentials and authentication details remain accessible to authorised personnel.

Difference Between GST Username, Password, Mobile Number and Email Address

Taxpayers sometimes assume that changing the registered mobile number automatically changes the GST username or password. These are separate aspects of GST Portal access.

The GST username is used to identify the registered account. The password is used for authentication. The registered mobile number and email address are contact and verification details associated with the GST registration and account.

Changing one of these details does not necessarily mean that the other details will automatically change.

What If the Mobile Number Was Entered Incorrectly During GST Registration?

If an incorrect mobile number was entered during the original GST registration, the taxpayer should review the registration information and use the appropriate amendment mechanism.

It is important to correct errors as soon as they are discovered, particularly if the incorrect number belongs to another person or is not accessible to the business.

Can a GST Practitioner Change the Mobile Number?

A GST practitioner or tax professional can assist a taxpayer with GST compliance and registration-related procedures, subject to the permissions and functionality available on the GST Portal.

However, the taxpayer remains responsible for ensuring that the information submitted in the GST registration is accurate.

Taxpayers should not provide their GST password or OTP to unauthorised individuals. If professional assistance is required, use a trusted and authorised tax professional.

Security Tips for GST Portal Users

GST Portal credentials should be handled carefully because they can provide access to important business tax information.

Follow these security practices:

• Do not share your GST password with unknown persons.
• Never disclose OTPs to unauthorised people.
• Use a strong and unique password.
• Review authorised users and signatories periodically.
• Update outdated contact information.
• Be cautious of fake GST websites and phishing messages.
• Access GST services through the official GST Portal.
• Do not click suspicious links received through unsolicited messages.

Frequently Asked Questions About Changing Mobile Number on GST Portal

1. Can I change my GST registered mobile number online?

GST registration information can generally be amended online through the GST Portal when the relevant details are eligible for amendment. The exact procedure depends on which mobile number or registration detail needs to be changed.

2. What if I lost the mobile number registered with GST?

If you no longer have access to the registered mobile number, identify the registration detail associated with that number and follow the applicable amendment or recovery procedure. If online authentication cannot be completed, professional assistance may be required.

3. Will changing my GST mobile number change my GSTIN?

No. A change in contact information does not ordinarily mean that the GSTIN itself changes. GSTIN is the unique Goods and Services Tax Identification Number associated with the registration.

4. Can I use my accountant's mobile number for GST?

A business should carefully consider whose mobile number is registered for GST-related communication and authentication. It is generally preferable for important GST access and verification information to remain under the control of an authorised person rather than an individual who may later leave the business.

5. Can I update the mobile number without changing the GST registration?

Eligible registration details can be amended through the applicable GST amendment functionality. Whether the particular mobile number can be changed separately depends on where the number is recorded and the nature of the amendment.

6. How can I check whether my GST mobile number is updated?

After completing the amendment process, review the relevant registration profile or amendment status on the GST Portal. If an amendment application has been submitted, use the relevant acknowledgement or ARN to track its status.

7. What should I do if I do not receive the OTP?

Check the mobile network, confirm that the entered number is correct, and wait briefly before requesting another OTP. If the issue continues, check whether the GST Portal is experiencing a technical issue and use the applicable GST support channels.

8. Is it important to update the email address along with the mobile number?

If the email address has also changed, it is sensible to review and update it through the appropriate GST registration amendment process. Keeping both mobile and email contact information current can help maintain effective GST communication.

9. Can a company update the mobile number of an authorised signatory?

Companies can amend eligible registration information relating to authorised signatories through the GST Portal. If the authorised signatory itself has changed, the company should follow the applicable procedure for updating the authorised signatory information.

10. Is there a fee for updating the GST mobile number?

The GST Portal itself does not generally charge a separate government fee merely for updating an eligible registration contact detail. However, a tax consultant or GST practitioner may charge a professional service fee for assisting with the amendment.

When Should You Seek Professional GST Assistance?

A straightforward contact detail update may be manageable by a taxpayer familiar with the GST Portal. However, professional assistance can be useful when the situation involves an inaccessible old mobile number, a former authorised signatory, incorrect registration information, changes in business constitution, or other amendments.

A professional can help identify the appropriate amendment category, review supporting documentation, prepare the application, and monitor the status of the amendment.

Businesses should nevertheless verify the information before submission because the taxpayer is responsible for the accuracy of its GST registration details.

Conclusion

Updating the mobile number on the GST Portal is an important administrative task when the registered contact information becomes outdated. A current mobile number can help the taxpayer or authorised person receive important GST communications and complete applicable authentication procedures.

The process generally involves accessing the GST Portal, reviewing the relevant registration information, entering the updated mobile number, completing applicable OTP verification, submitting the amendment, and tracking the application where necessary.

If you no longer have access to the old mobile number, the process may require additional steps depending on how the number is recorded in the GST registration and whether the authorised signatory information also needs to be changed.

Businesses should periodically review their GST registration information and ensure that mobile numbers, email addresses, authorised signatories, and other important details remain accurate. Keeping GST records updated can help businesses manage their tax compliance responsibilities more efficiently and avoid unnecessary communication or authentication issues.

If you are unsure about the correct procedure for your particular GST registration, consider taking assistance from a qualified GST professional before submitting an amendment.