IRS Publication 5425 – Taxpayer Digital Communication Secure File Sharing – Secure Messaging

IRS Publication 5425 – In today’s digital age, efficient and secure communication with government agencies is crucial for taxpayers, especially those involved in complex audits. IRS Publication 5425 introduces the Taxpayer Digital Communication Secure File Sharing – Secure Messaging (TDC SFS-SM) system, a tool designed to streamline interactions between taxpayers and the IRS. This publication, released in June 2020, focuses on facilitating faster exchanges of information for audits under the Large Business and International (LB&I) Division. Whether you’re a business owner, tax professional, or representative, understanding this system can save time, reduce costs, and enhance security in your IRS communications.

What Is IRS Publication 5425?

IRS Publication 5425 serves as a guide to the TDC SFS-SM platform, which allows taxpayers and their authorized representatives to securely send and receive messages and digital documents related to ongoing LB&I audits. Published by the Department of the Treasury and the Internal Revenue Service, it outlines a web-based solution that eliminates the need for traditional mail or phone calls, making audit processes more efficient.

The publication emphasizes the system’s role in modernizing taxpayer interactions, aligning with broader IRS efforts to adopt digital tools. As of 2026, while the core guidelines from the 2020 revision remain in effect, similar secure messaging options have expanded to other IRS divisions, such as Tax Exempt/Government Entities (TE/GE) and Appeals.

Key Features of the Secure Messaging System

The TDC SFS-SM system offers several user-friendly features tailored for LB&I audit participants:

Web-Based Accessibility: Access the platform via any web browser without needing to install software, certificates, or tokens.
Secure File Sharing: Send and receive digital documents and messages related to your audit, with all communications saved as a permanent digital record.
Email Notifications: Receive alerts via email when a new message arrives, including a secure link to the messaging center. These notifications exclude personal information to prevent identity theft.
Convenience and Flexibility: Communicate at your own pace, from any location, reducing the need for scheduled calls or physical mail.

This setup mimics a secure email service, ensuring that sensitive audit-related information is handled efficiently and confidentially.

Eligibility Requirements for Using Secure Messaging

Not every taxpayer can access TDC SFS-SM; it’s specifically for those under LB&I audits:

Primary Users: Companies currently undergoing an IRS LB&I audit, including authorized employees.
Representatives: Tax professionals or attorneys must have a valid Form 2848 (Power of Attorney and Declaration of Representative), sign a consent form, and complete authentication.

If your business qualifies, your IRS agent may invite you to participate, or you can request enrollment during an audit.

How to Enroll and Use the System: Step-by-Step Guide?

Enrolling in TDC SFS-SM is straightforward and guided by your IRS contact:

Initiate Participation: Discuss with your LB&I audit agent. They’ll provide a Taxpayer Consent form for review and signature.
Receive Invitation: After submitting the signed consent, you’ll get a system-generated email with your username and an access link.
Set Up Account: Log in using the provided credentials, create a password, and complete any required authentication.
Start Communicating: Once logged in, send messages, attach documents, and respond to IRS inquiries via the secure interface.

For representatives, additional steps include registering under “Tax Preparer Options” and potentially signing a Memorandum of Understanding (MOU). Note that the system may be unavailable on Saturdays from 6 p.m. to 10 p.m. Eastern Time for maintenance.

Security Measures in IRS Secure Messaging

Security is a top priority for the IRS Secure Messaging program. The system complies with federal standards, including those from the National Institute of Standards and Technology (NIST) and the Office of Management and Budget (OMB). Key protections include:

Encryption: Data is encrypted using Advanced Encryption Standard-256 (AES-256) and stored on FedRAMP-certified AWS GovCloud servers.
Virus and Spam Filtering: All attachments undergo antivirus scans, and executable files are blocked.
Privacy Assessments: Regular Privacy and Civil Liberties Impact Assessments (PCLIA) ensure compliance with privacy laws.
Annual Audits: The platform is audited under the Federal Information Security Modernization Act (FISMA) for ongoing cybersecurity.

These measures make TDC SFS-SM a reliable alternative to email or mail for sensitive tax information.

Adopting TDC SFS-SM offers tangible advantages for eligible taxpayers:

Time Savings: Avoid lengthy phone calls and waiting for mail delivery.
Cost Reduction: Eliminate expenses related to paper, printing, and postage.
Enhanced Efficiency: Quick document exchanges speed up audit resolutions.
Digital Record-Keeping: All interactions are automatically archived for easy reference.

For large businesses, this tool aligns with digital transformation goals, making IRS compliance less burdensome.

As of February 2026, IRS Publication 5425 remains relevant for LB&I audits, with no major revisions since its 2020 release. However, the IRS has expanded secure messaging to other areas, such as the Document Upload Tool and programs for businesses (Publication 6057, revised June 2025). If you’re not in LB&I, explore options like TE/GE Secure Messaging or the general IRS online communication portal.

For the latest updates, visit the official IRS website or consult your tax advisor.

Frequently Asked Questions About IRS Secure Messaging

Is Secure Messaging available for all IRS audits? No, Publication 5425 specifically covers LB&I Division audits.
What if I forget my password? Use the system’s recovery options or contact your IRS agent for assistance.
Are there file size limits for attachments? While not specified in the publication, standard IRS guidelines apply; check with your agent for details.
How does it compare to email? It’s more secure, as regular email isn’t encrypted to federal standards.

By leveraging IRS Publication 5425 and the TDC SFS-SM system, taxpayers can navigate LB&I audits with greater ease and security. Download the PDF from the official IRS site for full details and start your digital communication journey today.