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HomeGuides2FA in e-Invoicing
FY 2025-26 · AY 2026-27
Updated September 2026

2-Factor Authentication in e-Invoice System/e-Way Bill: Options, Steps and ImportanceComprehensive Guide for FY 2025-26

Explore the mandatory implementation of 2-Factor Authentication in the e-Invoice and e-Way Bill systems for enhanced security. Understand the options, steps, and potential drawbacks of this system.

Table of Contents
1

What is 2-Factor Authentication in e-Invoicing?


2

NIC's Mandate on Two-factor Authentication


3

Purpose of 2-Factor Authentication


4

Modes Available for Two-factor Authentication on The e-Invoice Portal


5

Steps for Setting Up 2-Factor Authentication


6

Drawbacks of 2FA Implementation


7

Alternate Secure Solutions to Avoid 2FA


8

FAQs on 2-Factor Authentication

What is 2-Factor Authentication in e-Invoicing?

  1. Definition and Overview

    Two-factor authentication (2FA) is a security process requiring two different authentication factors to verify a user's identity.

    • Enhances security by requiring an additional verification step.

    • Protects user credentials and sensitive data.

    • Implemented across e-Invoice and e-Way Bill systems.

  2. Importance in e-Invoicing

    2FA is crucial for safeguarding the integrity of the e-Invoicing system.

    • Prevents unauthorized access to sensitive financial data.

    • Ensures compliance with government mandates.

    • Reduces the risk of fraud and data breaches.

  3. Implementation Timeline

    The rollout of 2FA in the e-Invoicing system is phased based on turnover.

    • Mandatory for AATO over ₹20 crores from January 1, 2025.

    • Mandatory for AATO between ₹5 crores and ₹20 crores from February 1, 2025.

    • Mandatory for all taxpayers from April 1, 2025.

  4. Worked Example

    Example of a business implementing 2FA.

    • A business with AATO of ₹25 crores must implement 2FA by January 1, 2025.

    • The business will receive OTPs via SMS or the Sandes app.

    • Ensures compliance and enhances security for transactions.

NIC's Mandate on Two-factor Authentication

  1. NIC's Role

    The National Informatics Centre (NIC) oversees the implementation of 2FA.

    • NIC manages the e-Invoice and e-Way Bill portals.

    • Ensures secure access to government tax systems.

    • Provides technical support and updates.

  2. Mandate Details

    NIC's mandate specifies the requirements for 2FA implementation.

    • Applies to all taxpayers using the e-Invoice system.

    • Different deadlines based on AATO thresholds.

    • Mandatory for all users by April 1, 2025.

  3. Compliance Requirements

    Businesses must comply with NIC's 2FA requirements.

    • Register for 2FA using a registered mobile number.

    • Select a preferred mode for receiving OTPs.

    • Ensure timely implementation to avoid penalties.

  4. Technical Support

    NIC provides support for 2FA setup and troubleshooting.

    • Helpline numbers available for technical assistance.

    • Online resources and FAQs for user guidance.

    • Regular updates and patches for system security.

Purpose of 2-Factor Authentication

  1. Enhancing Security

    2FA adds an extra layer of security to the authentication process.

    • Protects against unauthorized access.

    • Secures sensitive financial information.

    • Reduces the risk of cyber threats.

  2. Compliance with Regulations

    2FA ensures compliance with government regulations.

    • Mandatory for all businesses by specific deadlines.

    • Aligns with global best practices for data security.

    • Ensures adherence to the GST framework.

  3. Improving System Efficiency

    2FA streamlines the authentication process for users.

    • Reduces the likelihood of system breaches.

    • Enhances user confidence in the system.

    • Facilitates smoother transactions and operations.

  4. User Accountability

    2FA promotes accountability among users.

    • Ensures only authorized users access the system.

    • Tracks user activity for audit purposes.

    • Encourages responsible use of the e-Invoice system.

Modes Available for Two-factor Authentication on The e-Invoice Portal

  1. SMS OTP

    Users receive a one-time password via SMS.

    • OTP sent to the registered mobile number.

    • Simple and widely used method.

    • Requires mobile network connectivity.

  2. Sandes App

    A government-provided messaging app for OTPs.

    • Downloadable from app stores.

    • Requires registration with a mobile number.

    • Provides a secure channel for receiving OTPs.

  3. NIC GST Shield App

    A dedicated app for generating OTPs.

    • Available for download from the e-Invoice portal.

    • Requires installation and registration.

    • Ensures secure OTP generation and retrieval.

Steps for Setting Up 2-Factor Authentication

  1. Registering for 2FA

    Initial registration process for 2FA.

    • Log in to the e-Invoice portal with credentials.

    • Navigate to the 2FA registration section.

    • Enter the registered mobile number for OTPs.

  2. Choosing an Authentication Mode

    Select a preferred mode for receiving OTPs.

    • Choose between SMS, Sandes app, or NIC GST Shield app.

    • Consider convenience and accessibility.

    • Ensure the chosen method is set up correctly.

  3. Verification Process

    Complete the verification to activate 2FA.

    • Receive an OTP on the chosen platform.

    • Enter the OTP on the portal for verification.

    • Confirm successful activation of 2FA.

  4. Troubleshooting Common Issues

    Address common issues during setup.

    • Ensure mobile number is correctly registered.

    • Check for network connectivity issues.

    • Contact NIC support for unresolved problems.

Drawbacks of 2FA Implementation

  1. Increased Complexity

    2FA adds complexity to the login process.

    • Requires additional steps for authentication.

    • May lead to user frustration if not managed well.

    • Needs user education and training.

  2. Potential Technical Issues

    Technical challenges can arise with 2FA.

    • Network issues can delay OTP delivery.

    • App-related problems may hinder access.

    • Requires regular updates and maintenance.

  3. Dependency on Mobile Devices

    2FA relies heavily on mobile devices.

    • Users must have access to their registered mobile.

    • Loss of device can disrupt access to the system.

    • Requires device compatibility with apps.

  4. User Resistance

    Some users may resist the change to 2FA.

    • Requires a shift in user behavior and habits.

    • May face initial resistance from less tech-savvy users.

    • Needs effective communication and support.

Alternate Secure Solutions to Avoid 2FA

  1. Biometric Authentication

    Using biometric data for authentication.

    • Fingerprint or facial recognition technology.

    • Offers a secure and user-friendly alternative.

    • Requires compatible hardware and software.

  2. Hardware Tokens

    Physical devices for generating OTPs.

    • Provides an additional layer of security.

    • Reduces dependency on mobile networks.

    • Requires distribution and management of tokens.

  3. Single Sign-On (SSO)

    Centralized authentication for multiple systems.

    • Simplifies the login process for users.

    • Reduces password fatigue and enhances security.

    • Requires integration with existing systems.

  4. Enhanced Password Policies

    Strengthening password requirements.

    • Implement complex password rules.

    • Encourage regular password updates.

    • Combine with other security measures for effectiveness.

FAQs on 2-Factor Authentication

What is 2-Factor Authentication?

2-Factor Authentication (2FA) is a security process requiring two different authentication factors to verify a user's identity, enhancing security for accessing systems like e-Invoicing and e-Way Bill.


When is 2FA mandatory for e-Invoicing?

2FA becomes mandatory for businesses with an AATO over ₹20 crores from January 1, 2025, for those between ₹5 crores and ₹20 crores from February 1, 2025, and for all taxpayers from April 1, 2025.


How can I receive OTPs for 2FA?

OTPs for 2FA can be received via SMS on the registered mobile number, through the Sandes app, or using the NIC GST Shield app, providing flexibility in authentication methods.


What are the benefits of 2FA?

2FA enhances security by adding an extra layer of protection, ensures compliance with regulations, improves system efficiency, and promotes user accountability in accessing sensitive financial systems.


Are there any drawbacks to 2FA?

Drawbacks of 2FA include increased complexity in the login process, potential technical issues, dependency on mobile devices, and possible user resistance, requiring effective management and support.


Can I avoid using 2FA?

While 2FA is mandatory, alternate secure solutions like biometric authentication, hardware tokens, and enhanced password policies can complement 2FA to enhance security further.


What should I do if I face issues with 2FA setup?

If you face issues with 2FA setup, ensure your mobile number is correctly registered, check network connectivity, and contact NIC support for technical assistance and troubleshooting.


How does 2FA improve system efficiency?

2FA improves system efficiency by reducing the likelihood of unauthorized access, enhancing user confidence, and facilitating smoother transactions and operations within the e-Invoicing system.


What is the role of NIC in 2FA implementation?

The National Informatics Centre (NIC) oversees 2FA implementation, manages the e-Invoice and e-Way Bill portals, provides technical support, and ensures secure access to government tax systems.


What happens if I don't comply with 2FA requirements?

Non-compliance with 2FA requirements can lead to restricted access to the e-Invoice and e-Way Bill systems, potential penalties, and increased risk of unauthorized access to sensitive financial data.

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