The global average cost of a data breach reached $4.45 million in 2023, according to IBM. With risks this high, organizations must prove that their security and compliance controls are not only effective during an audit, but consistently maintained over time.
However, a SOC 2 type II report only reflects a defined report period, not continuous validation. This creates a natural gap between the end of one SOC 2 report audit period and the date of the next audit, leaving stakeholders without an up-to-date SOC 2 report.
To address this, organizations often provide a bridge letter. This is a document that helps maintain assurance between reporting cycles. If you’re trying to learn what a SOC 2 bridge letter is and how it supports SOC 2 compliance, this guide will walk you through everything you need to know.
A SOC 2 bridge letter, often referred to simply as a bridge letter, is used by a service organization to explain what has occurred since the last SOC 2 reporting period.
In simple terms, a it’s a document that helps bridge the gap between your previous SOC 2 report and a recent SOC 2 report or upcoming next SOC report.
The bridge letter relates directly to the organization's SOC 2 report audit by addressing the gap between SOC 2 reporting cycles. Because a SOC 2 report that covers a specific audit period cannot extend beyond its defined timeframe, organizations use bridge letters to provide visibility into their current internal control environment.
Although it is not part of a formal SOC audit or SOC examination, the letter provides valuable insight into whether internal controls and processes remain stable after the end of your last SOC reporting window.
A bridge letter helps connect the last SOC 2 report or last SOC 2 audit report to a recent SOC 2 report. It explains whether any significant changes or material changes have occurred in the control environment since the last audit.
Because SOC reports typically reflect a past report period, they cannot account for updates made since last time. A bridge letter fills this gap by confirming whether the internal control environment and system and organization controls remain consistent.
A bridge letter is also sometimes known as a gap letter because it addresses the gap between your last SOC report and the report and the current date. Organizations issue a gap letter when they have completed a SOC 2 report, but do not yet have a latest SOC 2 report available.
In these situations, the service organization may provide a bridge letter to maintain transparency with stakeholders while preparing for a new SOC report.
Maintaining SOC 2 compliance requires more than completing its audit once a year. Because a SOC 2 report only reflects a defined report period, organizations must address the gap between your last verified controls and current operations.
A SOC 2 bridge letter helps extend assurance beyond the last SOC 2 report by documenting the status of internal controls and alignment with security and compliance standards. For every stakeholder relying on the organization's SOC reporting, this added visibility is critical.
A bridge letter is designed to bridge the gap since the last audit by confirming that controls since the last SOC continue to operate as expected. It often references the results of your SOC 2 and explains whether those controls still meet trust services criteria.
By doing so, it demonstrates the continued operating effectiveness and suitability of the design of the organization’s internal control environment.
A strong bridge letter covers the key details stakeholders need to understand what has changed since the previous SOC 2 report.
Common elements include:
The bridge letter isn’t a replacement for a full SOC 2, but it plays a key role in maintaining transparency between reports.
A bridge letter is prepared internally by the service organization, rather than by an auditor. Unlike formal SOC 2 audit reports, it is not part of a regulated SOC 2 audit or SOC audit process.
However, it should still align closely with the last SOC 2 report audit, including details from the SOC 2 report audit period and broader SOC 2 readiness efforts leading into the next audit.
To ensure credibility, the document should be reviewed internally, aligned with prior SOC report language, and formally approved. Also, the letter should be signed by an authorized party.
Many organizations need a practical starting point when producing a SOC 2 bridge letter. Using a structured template ensures your bridge letter covers key elements such as the report period, any material changes, and the status of your internal control environment since the last SOC 2 report.
Because bridge letters typically follow a consistent format, a template can simplify documentation, maintain alignment with prior SOC 2 reports, and clearly address the gap between the end of the previous report and the current date.
We’ve created a professional SOC 2 Type II bridge letter template to help organizations streamline their documentation and provide stakeholders with clear, actionable assurance between SOC 2 reporting periods.
Bridge letters are an essential part of maintaining continuous SOC 2 compliance.
When used effectively, they help organizations maintain consistent assurance between reporting cycles and reinforce trust with stakeholders.
Organizations should issue a bridge letter when there is a clear gap between the end of the last audit and the availability of a recent SOC 2 report. This is especially important when the date of the next audit has not yet resulted in a finalized report.
To maintain SOC 2 compliance, organizations should continuously document controls since the last SOC 2. This includes tracking updates to the internal controls, monitoring the control environment, and ensuring alignment with trust services expectations.
A well-prepared bridge letter supports SOC 2 attestation, complements existing SOC report documentation, and keeps each stakeholder informed.
It also plays a role in preparing for the next SOC cycle and aligning expectations ahead of future SOC 2 audit reports.
For stakeholders, a bridge letter provides visibility into the gap between SOC 2 reporting cycles.
It reassures them that the internal control environment remains stable even after the last report period ends.
A strong bridge letter addresses relevant trust services criteria, including confidentiality and processing integrity. It helps demonstrate that operating effectiveness continues across the defined report period, even outside the formal audit window.
While useful, a bridge letter isn’t always enough. If there are major material changes or evolving risks, organizations may need a SOC 2 type ii report or additional SOC 2 audit reports to maintain credibility.
A SOC 2 bridge letter is a practical solution for maintaining assurance between reporting cycles. While it does not replace a formal SOC 2 audit, it helps organizations bridge the gap between the last SOC 2 report and the recent SOC 2 report. As expectations around security and compliance standards continue to grow, organizations that proactively use bridge letters will be better positioned to maintain trust, support stakeholders, and prepare for their next audit.
