The auditor is the gatekeeper with inspection access and a franchise to lose. Their behaviour, read in rank order, is the highest-conviction public-information tier, above any ratio.
Rotation versus resignation (do not confuse them). Section 139 of the Companies Act mandates auditor rotation for prescribed companies: an individual auditor for one term of 5 years, an audit firm for two terms (10 years), with a 5-year cooling-off. So a scheduled auditor change is routine noise; post-2014 it happens on a clock. What matters is a mid-tenure resignation: an auditor walking out in year 2 or 3 of a term, especially citing "information and explanations not made available" or unresolved disagreements. That is an informed insider with everything to lose acting against commercial interest, and it is among the loudest signals that exists. India's auditors did exactly this before several collapses: Deloitte at Manpasand (May 2018) and at DHFL (2019), Price Waterhouse at Vakrangee (April 2018). SEBI's 2019 framework now forces a resigning statutory auditor to give detailed reasons and, depending on timing, to complete a limited review, so the resignation letter itself is a document you read.
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How do audit opinions and CARO 2020 signal trouble?
The opinion ladder (from mild to alarming). (1) Key Audit Matters (KAMs) under SA 701 (mandatory for listed-entity audits for periods beginning on or after 1 April 2018) are the matters of most significance in the audit; they are not negatives, but which matters the auditor flags (revenue recognition, RPT recoverability, impairment, litigation) tells you where the audit stress sits. (2) Emphasis of Matter (EOM): the auditor draws attention to something already disclosed (a going-concern uncertainty, a large contingent) without qualifying the opinion. (3) Qualified opinion, where "except for" a specified issue the statements are fair: a real limitation. (4) Adverse opinion / disclaimer, where the statements are not fair, or the auditor cannot form an opinion: the top of the ladder. Read them in that order of alarm, and read the change year-over-year: a KAM that becomes an EOM that becomes a qualification is a trajectory.
CARO 2020 and the fraud trigger. The Companies (Auditor's Report) Order 2020 forces the auditor to answer specific questions that map directly onto this module: clause 3(iii) on loans and advances, including to related parties; clauses on funds routed/round-tripping and end-use; on whether the company is a wilful defaulter; and clause 3(xi) on fraud noticed or reported during the year. Separately, Section 143(12) requires an auditor who suspects fraud to report it: fraud of ₹1 crore or more to the Central Government (via Form ADT-4), smaller amounts to the audit committee/board. And above the statutory auditor sits NFRA, the independent audit regulator, whose orders (e.g., against the IL&FS/IFIN auditors) are themselves a public signal.
How do US auditor signals compare?
US contrast. The US analogues: Critical Audit Matters (CAMs) under PCAOB AS 3101 (phased in for large accelerated filers in 2019, others 2020) mirror KAMs; a change of auditor must be disclosed on Form 8-K Item 4.01 within four business days, with the outgoing auditor given a chance to respond, which is the US version of the resignation-reasons disclosure; SOX §404 requires management and (for larger filers) the auditor to attest to internal control over financial reporting, and a §404 material-weakness disclosure is a high-conviction signal; the PCAOB inspects and sanctions firms. Same logic, different letters.