A bridge letter has no printed expiration because it isn’t a certificate — it’s a dated statement that controls have held since the last report’s period ended. Reviewers therefore watch two numbers: the size of the gap the letter spans, and how recently it was signed. A letter from January loses persuasive power by May even if nothing changed, because five months of “nothing changed” is itself a claim that needs refreshing.
The working conventions are stable across procurement teams. A gap of roughly three months raises no eyebrows; approaching half a year, expect follow-up questions; beyond that, the letter stops carrying the conversation and the buyer starts asking why the next report is so far away. Hence the standard cadence — reissue quarterly, and on demand for any deal in flight, each one newly dated rather than recycled.
A gap that keeps growing is an audit-calendar problem wearing a paperwork costume: keep observation periods contiguous and the stretch a letter must cover collapses to the auditor’s writing time. The letter’s full anatomy and an adaptable example live on the SOC 2 bridge letter page; the compact definition is at bridge letter.
No — nothing does. The report permanently covers its stated period; the letter adds a management statement about the months after it, which is a different and weaker kind of assurance. Reviewers weigh the pair together: audited period plus asserted gap.
You can keep issuing them, and each one will buy less. State the revised report date honestly, expect enterprise reviewers to probe the delay, and treat a bridge approaching a year as the real finding: at that length, some buyers will ask for interim evidence instead of another letter.
