These are the deliverables your audit firm produces — not Auditus.ai. Each is mapped to the standard that requires it, with a plain-English description of what it is, why it matters, and when in the audit cycle it lands.
Engagement letter
CAS 210What it is
Signed agreement between the audit firm and the issuer setting out the scope, responsibilities, timeline, and fee for the audit.
Why it matters
Required before any audit work starts. Defines what the audit firm will and will not do — so there are no surprises later.
When: At engagement acceptance (before fieldwork)·All purposes
Audit report (opinion on the financial statements)
CAS 700What it is
The signed report stating whether the financial statements present fairly, in all material respects, the issuer's financial position and results — under IFRS, US GAAP, or ASPE as applicable.
Why it matters
The deliverable. This is what the public market, the audit committee, lenders, and investors rely on to trust the financial statements.
When: At the close of the audit (signed alongside the F/S)·All purposes
Management letter (significant deficiencies)
CAS 265What it is
A written communication from the audit firm to those charged with governance, identifying significant deficiencies in internal control discovered during the audit.
Why it matters
Forces the issuer's board and audit committee to see and address control gaps. Carries forward year-over-year if not remediated.
When: Shortly after the audit report is signed·All purposes
Audit committee communication (key audit matters)
CAS 260, CAS 701What it is
Formal communication to the audit committee covering the planned scope and timing of the audit, significant findings, key audit matters, and any independence concerns.
Why it matters
Required by CAS 260; this is how the audit committee discharges its oversight role over the audit.
When: Planning phase, then at completion·All purposes
Management representation letter
CAS 580What it is
A signed letter from management to the audit firm asserting that the F/S are complete, that all material transactions are recorded, that management has disclosed all relevant information, and other specific representations.
Why it matters
The audit firm needs this on file before signing the audit report. Without it, the report cannot be issued.
When: Dated the same date as the audit report·All purposes
Going-concern conclusion memo
CAS 570, IAS 1What it is
The audit firm's documented conclusion on management's going-concern assessment — whether the issuer can continue operations for at least 12 months from the report date.
Why it matters
If the auditor concludes there's material uncertainty, the audit report includes an emphasis-of-matter paragraph that is a major signal to investors and lenders.
When: At the close of the audit·All purposes
ICFR communication (NI 52-109 context)
NI 52-109, CAS 315What it is
The audit firm's documented assessment of the design and operating effectiveness of the issuer's internal control over financial reporting, supporting management's NI 52-109 certifications.
Why it matters
Reporting issuers' CEO and CFO sign NI 52-109 certifications. The audit firm's ICFR work-product is what supports those certifications under inspection.
When: Annual audit cycle·Annual auditGoing public
SOX 404(b) ICFR auditor attestation (US cross-listed only)
SOX 404(b)What it is
A separate signed attestation by the audit firm on the effectiveness of the issuer's ICFR, required for US-listed large accelerated filers.
Why it matters
Without it, a 10-K or 40-F cannot be signed by a large accelerated filer.
When: Annual filing with SEC·Annual audit
Comfort letter (to the underwriter)
NI 41-101; AU-C 920 (US)What it is
A signed letter from the audit firm to the underwriter providing negative assurance on specified financial information in the prospectus.
Why it matters
The underwriter relies on this letter for its due-diligence defence. No comfort letter, no pricing call.
When: Pricing date of the IPO·Going public
Auditor consent (to inclusion of the audit report in the prospectus)
NI 41-101 §4A.5What it is
A signed, dated consent allowing the audit report to be reproduced in the prospectus filing.
Why it matters
Without it, the prospectus filing is rejected on receipt by the securities commission.
When: Just before prospectus filing·Going public
Opening-balance communication (new auditor only)
CAS 510What it is
When the audit firm is new to the issuer this year, a documented assessment of opening balances — either via review of the predecessor auditor's working papers or by performing alternative procedures.
Why it matters
Without this, the audit firm cannot issue an unqualified opinion on the comparative period.
When: Early in the audit cycle·All purposes
Carve-out audit report (for the part of the business being sold)
CAS 700What it is
A separate audit report on the financial statements of a divested business unit, prepared on a stand-alone basis using management's allocation methodology for shared costs and capital.
Why it matters
The buyer needs an audited basis for the business they are acquiring. Without it, the working-capital true-up and purchase-price adjustments cannot be calculated.
When: Pre-closing of the transaction·Sale of company
Closing balance sheet audit + working-capital true-up letter
CAS 700; transaction-specificWhat it is
An audit of the balance sheet as at the closing date of the M&A transaction, plus a letter quantifying the working-capital adjustment against the agreed peg.
Why it matters
Triggers the dollar-for-dollar purchase-price adjustment that releases (or claws back) the closing escrow.
When: Within 60–90 days post-closing·Sale of company
Audited base-period financial statements (for the valuator)
CAS 700What it is
Audited financial statements covering the period that the valuator will use as the historical base for their DCF or multiples analysis.
Why it matters
A valuation built on un-audited numbers is not defensible in litigation or against IRS / CRA challenge. The audit firm's deliverable anchors the valuator's work.
When: Before the valuator finalizes the report·Valuation