Here's the lowdown
The PCAOB proposed removing AS 6101's fixed 135-day limit for certain negative assurance in comfort letters.
The replacement would look to whether an issuer has met its SEC reporting obligations and filed the financial information required by those rules.
Comments on PCAOB Release No. 2026-008 are due January 4, 2027, and the auditor would still decide whether negative assurance is appropriate.
A company can be current on every required SEC filing and still hit a calendar rule that makes a capital raise harder.
Why can that happen? Blame one odd number: 135.
The PCAOB's new proposal would remove that fixed day count from its comfort-letter standard. Its goal is to make the rule follow modern reporting deadlines instead of an old quarterly assumption.
That sounds technical. The real-world question is simple: Can an auditor tell underwriters that nothing came to its attention suggesting certain financial figures changed in a way they should worry about?
What a comfort letter actually does
When a public company sells securities, an investment bank or another underwriter performs due diligence before helping bring the offering to market.
An underwriter may ask the company's auditor for a comfort letter. That letter can cover unaudited interim financial information and changes in selected financial statement items after the latest audited or reviewed period.
One useful form of comfort is called negative assurance.
That does not mean the auditor guarantees nothing changed. It means the auditor performed specified work and found no evidence that caused it to believe the information failed to meet the stated criteria.
Underwriters may care because the letter gives them another piece of evidence while they assess an offering. Issuers care because a missing piece of comfort can make a financing harder to complete.
The 135-day problem
AS 6101 currently lets an auditor provide this negative assurance for a date less than 135 days after the end of the latest period the auditor audited or reviewed.
Once that window closes, the auditor can describe procedures and findings. The auditor cannot give the same negative assurance about those later changes under the current rule.
This cutoff assumes a tidy quarterly filing rhythm. Real filing deadlines do not always line up that way.
Consider a calendar-year company after its third-quarter report. The 135-day clock can expire before its annual report is due, even when the company is fully current with SEC requirements.
That creates a dead zone. The issuer has not missed a filing, but its auditor may be blocked from providing negative assurance solely because the calendar crossed day 135.
If an underwriter will not proceed without that assurance, the company may need to delay the offering or find another way to address the due diligence risk.
What the PCAOB would change
The proposal would replace the fixed cutoff with a test based on the issuer's reporting obligations.
In plain English, the auditor could consider negative assurance when the issuer has timely filed the financial information required under the securities laws. The standard would follow the company's actual reporting status instead of counting days from the last audited or reviewed period.
That approach could also age better. If SEC deadlines change later, the comfort-letter rule would not need another amendment just to keep the calendars aligned.
The PCAOB is not proposing to force auditors to issue comfort letters.
Professional judgment still matters. The auditor would need enough appropriate evidence and would still decide whether giving negative assurance makes sense in the circumstances.
Why audit teams should care now
Nobody needs to rewrite firm policy today. This is still a proposal.
But firms that serve public companies can identify where the 135-day rule currently creates gaps. That means comparing offering timelines, review dates, annual filing deadlines, and the procedures used to support negative assurance.
Capital-markets teams can also study the wording closely. A rule tied to reporting obligations may reduce arbitrary timing problems, but it will not erase the need for careful cutoff work, current financial information, and a clear agreement about what the auditor will do.
Comments are due January 4, 2027. The most useful feedback will likely focus on whether the new test is clear enough to apply and whether it creates any new gaps of its own.
The proposal could remove a stale clock. It cannot remove the auditor's judgment call.
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