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IPO Accountant
The financial statements in an IPO registration statement must be audited by an independent public accounting firm that is registered with the Public Company Accounting Oversight Board (PCAOB). The firm must satisfy the SEC's auditor-independence requirements in Rule 2-01 of Regulation S-X, conduct the audit under PCAOB standards, and express its conclusion in an auditor's report — most commonly an unqualified ("clean") opinion under PCAOB Auditing Standard AS 3101.
Each section answers one question, with every fact mapped to a named primary authority and linked for verification.
Who audits the financial statements in an IPO registration statement?
The audited financial statements required in an IPO registration statement must be examined by an independent public accountant — specifically, a public accounting firm that is registered with the Public Company Accounting Oversight Board (PCAOB). Rule 2-01(a) of Regulation S-X requires the accountant to be duly registered and in good standing under the laws of its home jurisdiction, and Rule 2-01(b) requires the accountant to be independent of the company it audits.
Regulation S-X (17 CFR part 210) governs the form and content of the financial statements filed with the SEC, and Rule 2-01, titled 'Qualifications of accountants,' is designed to ensure that auditors are both qualified and independent of their audit clients 'in fact and in appearance.' Because the company becomes an 'issuer' when it files a Securities Act registration statement, its auditor must also be registered with the PCAOB. The report of the independent registered public accounting firm accompanies the financial statements in the prospectus.
Source: eCFR — 17 CFR 210.2-01(a)-(b) (Regulation S-X, Qualifications of Accountants) ↗
What is the PCAOB, and why must the auditor be registered with it?
The Public Company Accounting Oversight Board (PCAOB) is the nonprofit board created by the Sarbanes-Oxley Act of 2002 to oversee the audits of public companies. Under Section 102(a) of that Act, it is unlawful for any firm that is not a registered public accounting firm to prepare or issue — or to participate in preparing or issuing — an audit report for an issuer, so an IPO company's auditor must be PCAOB-registered.
Section 101 of the Sarbanes-Oxley Act established the PCAOB, and Section 102 makes registration mandatory: a public accounting firm must register with the PCAOB to prepare or issue an audit report for a U.S. public company or broker-dealer, or to play a substantial role in such audits. Firms apply through the PCAOB's Registration, Annual, and Special Reporting (RASR) system and pay a registration fee, and the Board reviews each application. Section 104 provides that the PCAOB inspects registered firms — annually for firms that regularly issue audit reports for more than 100 issuers, and at least once every three years for firms auditing 100 or fewer.
Source: Sarbanes-Oxley Act of 2002, Sections 101, 102, and 104 — Public Law 107-204 (govinfo) ↗
Under what standards is the audit conducted?
The audit is conducted under the auditing standards of the PCAOB. Section 103 of the Sarbanes-Oxley Act directs the PCAOB to establish auditing and related professional practice standards for registered public accounting firms, and the auditor's report states that the audit was conducted in accordance with the standards of the PCAOB.
Section 103 gives the PCAOB authority to set auditing, quality-control, ethics, and independence standards for registered firms that audit issuers. The PCAOB's auditing standards (the 'AS' series) govern how the audit is planned and performed and what the auditor must report. Separately, Rule 2-02(b) of Regulation S-X requires the accountant's report to state the applicable professional standards under which the audit was conducted.
Source: Sarbanes-Oxley Act of 2002, Section 103 — Public Law 107-204 (govinfo) ↗
What does auditor independence require — the general standard?
Rule 2-01(b) of Regulation S-X sets the general independence standard: the SEC will not recognize an accountant as independent if the accountant is not — or if a reasonable investor with knowledge of all relevant facts and circumstances would conclude the accountant is not — capable of exercising objective and impartial judgment on all issues within the accountant's engagement.
The SEC applies this standard by asking whether a relationship or service creates a mutual or conflicting interest with the client, places the accountant in the position of auditing its own work, results in the accountant acting as management or an employee of the client, or places the accountant in the position of being an advocate for the client. In determining independence, the Commission considers all relevant circumstances, including relationships beyond those relating to filings. Paragraphs (c)(1) through (c)(8) of the rule then apply the general standard to specific circumstances.
Source: eCFR — 17 CFR 210.2-01(b) (Regulation S-X, general standard of auditor independence) ↗
What financial, employment, and business relationships impair independence?
Rule 2-01(c)(1)-(3) makes an accountant not independent when, at any point during the audit and professional engagement period, it has certain financial relationships (such as a direct or material indirect investment in the audit client), employment relationships (such as a firm professional serving as a director, officer, or employee of the client, or a close family member in a financial-reporting-oversight role), or direct or material indirect business relationships with the audit client or its decision-makers.
Rule 2-01(c)(1) addresses financial interests — direct investments in the client, certain loans, bank and brokerage accounts, and beneficial ownership of more than five percent of the client's equity securities. Rule 2-01(c)(2) addresses employment relationships, including a current firm partner or professional employed by, or serving on the board of, the client. Rule 2-01(c)(3) addresses direct or material indirect business relationships with the client or with its officers, directors, or significant-influence owners, other than providing professional services or being a consumer in the ordinary course of business. These restrictions run to 'covered persons in the firm' as defined in Rule 2-01(f)(11).
Source: eCFR — 17 CFR 210.2-01(c)(1)-(3) (financial, employment, and business relationships) ↗
What non-audit services is the auditor prohibited from providing to the company?
Rule 2-01(c)(4) of Regulation S-X, which implements Section 10A(g) of the Securities Exchange Act, makes an accountant not independent if it provides specified non-audit services to an audit client. The prohibited services include bookkeeping, financial information systems design and implementation, appraisal or valuation services, actuarial services, internal audit outsourcing, management or human-resources functions, broker-dealer or investment-banking services, legal services, and expert services unrelated to the audit.
Several of the prohibitions in Rule 2-01(c)(4)(i)-(v) apply unless it is reasonable to conclude that the results of the service will not be subject to audit procedures during the audit of the client's financial statements. Section 201 of the Sarbanes-Oxley Act added this list of contemporaneously prohibited services to Section 10A(g) of the Exchange Act. Rule 2-01(c)(5) separately makes an accountant not independent if it provides any service or product to an audit client for a contingent fee or a commission.
Source: eCFR — 17 CFR 210.2-01(c)(4)-(5); Securities Exchange Act Section 10A(g) ↗
Who selects the auditor and pre-approves its services?
Under Section 10A(m) of the Securities Exchange Act, the issuer's audit committee is directly responsible for the appointment, compensation, and oversight of the registered public accounting firm. Rule 2-01(c)(7) and Section 10A(i) make the accountant not independent unless the audit committee pre-approves all audit and permissible non-audit services, either specifically or under detailed pre-approval policies and procedures.
Section 10A(m)(3) also requires each member of the audit committee to be independent. Rule 2-01(c)(7) permits a limited de minimis exception to pre-approval for non-audit services that in the aggregate are no more than five percent of the total revenues the audit client pays the accountant in the fiscal year, were not recognized as non-audit services at the time of the engagement, and are promptly brought to the audit committee and approved before the audit is completed.
Source: eCFR — 17 CFR 210.2-01(c)(7); Securities Exchange Act Section 10A(i) and (m) ↗
How often must the audit partners rotate off the engagement?
Rule 2-01(c)(6) of Regulation S-X makes the accountant not independent if the lead audit partner or the Engagement Quality Reviewer serves for more than five consecutive years, or if certain other audit partners serve for more than seven consecutive years. Section 203 of the Sarbanes-Oxley Act requires this rotation of the lead and concurring audit partners.
After serving the maximum five-year period as lead partner or Engagement Quality Reviewer, the partner must stay off that audit client for a five-consecutive-year 'time-out' period; other audit partners who reach seven consecutive years must stay off for two years. A small-firm exemption applies to accounting firms with fewer than five issuer audit clients and fewer than ten partners, provided the PCAOB reviews the relevant engagements at least once every three years.
Source: eCFR — 17 CFR 210.2-01(c)(6); Sarbanes-Oxley Act Section 203 ↗
Is there a cooling-off period before firm personnel can join the company?
Yes. Rule 2-01(c)(2)(iii)(B) makes the accountant not independent if a former partner or professional employee takes a financial-reporting-oversight role at the issuer, unless that person was not a member of the audit engagement team during the one-year period preceding the start of audit procedures for the fiscal period that includes the date of hiring. Section 206 of the Sarbanes-Oxley Act established this one-year cooling-off period.
A 'financial reporting oversight role' under Rule 2-01(f)(3)(ii) includes positions such as director, chief executive officer, president, chief financial officer, chief operating officer, general counsel, chief accounting officer, controller, director of internal audit, director of financial reporting, and treasurer. The one-year look-back applies to former audit-engagement-team members who move into these roles at the audit client.
Source: eCFR — 17 CFR 210.2-01(c)(2)(iii) and (f)(3); Sarbanes-Oxley Act Section 206 ↗
What must the auditor communicate to the audit committee?
Rule 2-07 of Regulation S-X requires the registered public accounting firm to report to the issuer's audit committee, before its audit report is filed with the SEC, all critical accounting policies and practices to be used, all alternative accounting treatments within GAAP that have been discussed with management (including the ramifications of their use and the treatment the firm prefers), and other material written communications between the firm and management.
Rule 2-07 works together with Section 10A(k) of the Securities Exchange Act, which requires the auditor to report such matters to the audit committee. 'Other material written communications' can include a management letter or a schedule of unadjusted differences. These required communications are separate from, and in addition to, the auditor's report on the financial statements.
Source: eCFR — 17 CFR 210.2-07; Securities Exchange Act Section 10A(k) ↗
What is the auditor's report, and what is an unqualified opinion?
The auditor's report is the firm's written report on whether the financial statements are fairly presented. In an unqualified — or 'clean' — opinion under PCAOB Auditing Standard AS 3101, the auditor states that the financial statements present fairly, in all material respects, the company's financial position, results of operations, and cash flows in conformity with the applicable financial reporting framework (such as U.S. GAAP).
AS 3101 governs the auditor's report when the auditor expresses an unqualified opinion. The report is titled 'Report of Independent Registered Public Accounting Firm,' states that the audit was conducted in accordance with the standards of the PCAOB, and states that the firm is required to be independent of the company. Separately, Rule 2-02 of Regulation S-X requires the accountant's report to be dated, signed manually, to indicate the city and state where issued, and to state the applicable professional standards and the accountant's opinion. When the auditor takes exception, Rule 2-02(d) and PCAOB standard AS 3105 address qualified, adverse, and disclaimer conclusions. The audited statements and the accompanying report are included in the IPO registration statement (see 'S-1 Filing').
Source: PCAOB — Auditing Standard AS 3101 (Auditor's Report, Unqualified Opinion); 17 CFR 210.2-02 ↗
What are critical audit matters (CAMs)?
A critical audit matter (CAM) is any matter arising from the audit that was communicated or required to be communicated to the audit committee and that both relates to accounts or disclosures material to the financial statements and involved especially challenging, subjective, or complex auditor judgment. AS 3101 requires the auditor to communicate any CAMs in the auditor's report.
Under AS 3101, for each critical audit matter the auditor identifies the matter, describes the principal considerations that led it to determine the matter was a CAM, describes how the matter was addressed in the audit, and refers to the relevant financial-statement accounts or disclosures. Communication of CAMs is not required for audits of emerging growth companies, brokers and dealers, investment companies other than business development companies, and certain benefit plans — so many first-time IPO issuers, which qualify as emerging growth companies, do not present CAMs in their initial auditor's reports.
Source: PCAOB — Auditing Standard AS 3101 (Critical Audit Matters) ↗
What must the auditor's report contain?
The required elements of the auditor's report on financial statements when the auditor expresses an unqualified opinion, under PCAOB Auditing Standard AS 3101 together with the technical requirements of Rule 2-02 of Regulation S-X. AS 3101 is a PCAOB standard, so its required elements are described here, not reproduced verbatim; Regulation S-X is a U.S. Government work in the public domain (17 U.S.C. 105).
| Report element | What it states | Authority |
|---|---|---|
| Title | A title that includes the word 'Independent' — the report is titled 'Report of Independent Registered Public Accounting Firm' | PCAOB AS 3101 · source |
| Addressee | The report is addressed to the company's shareholders and board of directors (or equivalents) | PCAOB AS 3101 · source |
| Opinion on the financial statements | States that the financial statements present fairly, in all material respects, the company's financial position, results of operations, and cash flows in conformity with the applicable financial reporting framework | PCAOB AS 3101; 17 CFR 210.2-02(c) · source |
| Basis for opinion | States that the financial statements are management's responsibility and the auditor's responsibility is to express an opinion, that the audit was conducted in accordance with the standards of the PCAOB, and that the firm is required to be independent of the company | PCAOB AS 3101; 17 CFR 210.2-02(b) · source |
| Critical audit matters | Communicates any critical audit matters (or states that there are none), except for issuers exempt from CAM communication such as emerging growth companies | PCAOB AS 3101 · source |
| Signature | The manual signature of the audit firm | PCAOB AS 3101; 17 CFR 210.2-02(a)(2) · source |
| Auditor tenure | A statement of the year the auditor began serving consecutively as the company's auditor | PCAOB AS 3101 · source |
| City and State | The city and state (or city and country, for a non-U.S. firm) where the report was issued | PCAOB AS 3101; 17 CFR 210.2-02(a)(3) · source |
| Date | The date of the auditor's report | PCAOB AS 3101; 17 CFR 210.2-02(a)(1) · source |
Key terms, defined
- Public Company Accounting Oversight Board (PCAOB)
- The nonprofit corporation established by Section 101 of the Sarbanes-Oxley Act of 2002 to oversee the audits of public companies that are subject to the securities laws, in order to protect investors and further the public interest in informative, accurate, and independent audit reports. The PCAOB registers and inspects public accounting firms and sets the auditing and related standards under which audits of issuers are conducted. ↗
- Registered public accounting firm
- A public accounting firm registered with the PCAOB under Section 102 of the Sarbanes-Oxley Act. Section 102(a) makes it unlawful for any firm that is not a registered public accounting firm to prepare or issue, or to participate in preparing or issuing, an audit report for an issuer. An IPO company's auditor must be a registered public accounting firm. ↗
- Auditor independence (general standard)
- Under Rule 2-01(b) of Regulation S-X, the SEC will not recognize an accountant as independent with respect to an audit client if the accountant is not, or a reasonable investor with knowledge of all relevant facts and circumstances would conclude the accountant is not, capable of exercising objective and impartial judgment on all issues within the engagement. Rule 2-01 is designed to ensure that auditors are independent of their audit clients both in fact and in appearance. ↗
- Covered persons in the firm
- Under Rule 2-01(f)(11) of Regulation S-X, the partners, principals, shareholders, and employees of an accounting firm to whom many of the independence restrictions apply: the audit engagement team; the chain of command; any partner, principal, shareholder, or managerial employee who has provided (or expects to provide) ten or more hours of non-audit services to the audit client; and any partner, principal, or shareholder from an office in which the lead audit engagement partner primarily practices in connection with the audit. ↗
- Audit and professional engagement period
- Under Rule 2-01(f)(5) of Regulation S-X, the period over which independence must be maintained. It includes both the period covered by the financial statements being audited or reviewed (the 'audit period') and the period of the engagement (the 'professional engagement period'), which begins when the accountant signs the initial engagement letter or begins audit procedures, whichever is earlier, and ends when the client or accountant notifies the SEC that the client is no longer that accountant's audit client. ↗
- Audit committee
- Under Section 10A(m) of the Securities Exchange Act, a committee of the board of directors (or the full board, if no such committee exists) that is directly responsible for the appointment, compensation, and oversight of the registered public accounting firm and whose members must be independent. Rule 2-01(f)(17) of Regulation S-X adopts the definition of 'audit committee' in Section 3(a)(58) of the Exchange Act. ↗
- Prohibited non-audit services
- The categories of services in Rule 2-01(c)(4) of Regulation S-X (and Section 10A(g) of the Securities Exchange Act) that an accountant may not provide to an audit client without impairing independence: bookkeeping, financial information systems design and implementation, appraisal or valuation services, actuarial services, internal audit outsourcing, management functions, human resources, broker-dealer or investment-banking services, legal services, and expert services unrelated to the audit. ↗
- Audit partner (lead partner and Engagement Quality Reviewer)
- Under Rule 2-01(f)(7) of Regulation S-X, an audit partner is a member of the audit engagement team with responsibility for decision-making on significant auditing, accounting, and reporting matters, or who maintains regular contact with management and the audit committee. It includes the lead or coordinating partner ('lead partner') and the partner conducting the engagement quality review ('Engagement Quality Reviewer'), each of whom is subject to a five-consecutive-year rotation limit under Rule 2-01(c)(6). ↗
- Unqualified opinion
- The auditor's conclusion, expressed in the report governed by PCAOB Auditing Standard AS 3101, that the financial statements present fairly, in all material respects, the company's financial position, results of operations, and cash flows in conformity with the applicable financial reporting framework. Rule 2-02(c) of Regulation S-X requires the accountant's report to state clearly the opinion of the accountant on the financial statements and the accounting principles reflected in them. ↗
- Critical audit matter (CAM)
- Under PCAOB Auditing Standard AS 3101, any matter arising from the audit that was communicated or required to be communicated to the audit committee and that both relates to accounts or disclosures material to the financial statements and involved especially challenging, subjective, or complex auditor judgment. CAM communication is not required for audits of emerging growth companies, brokers and dealers, investment companies other than business development companies, and certain benefit plans. ↗
Cite this page
1BusinessWorld IPO Center, "IPO Accountant: The Independent Auditor's Role, Registration, and Report." Compiled from primary authorities — the Sarbanes-Oxley Act of 2002 (Public Law 107-204), SEC Regulation S-X Rules 2-01, 2-02, and 2-07, Section 10A of the Securities Exchange Act of 1934, and PCAOB Auditing Standard AS 3101 — each linked inline. Retrieved 2026-07-11.
The IPO Center is informational only. It is provided by 1BusinessWorld strictly for general informational and educational purposes. Nothing in the IPO Center constitutes, or should be construed as, legal, accounting, auditing, underwriting, tax, investment, financial, valuation, listing, or other professional advice, or a recommendation, endorsement, solicitation, or offer to buy or sell any security or to engage in any transaction. 1BusinessWorld is not a law firm, accounting firm, auditor, broker-dealer, underwriter, investment adviser, or securities exchange, and nothing in the IPO Center creates any advisory, fiduciary, attorney-client, or other professional relationship with 1BusinessWorld. Although the IPO Center references official materials published by regulators, exchanges, and other authorities, 1BusinessWorld makes no representation or warranty, express or implied, as to the accuracy, completeness, timeliness, or fitness for any purpose of any content, and, to the fullest extent permitted by law, disclaims all liability for any loss or damage of any kind arising directly or indirectly from the use of, or reliance on, any information presented. Securities laws, regulations, listing standards, and market practices change frequently and differ by jurisdiction; readers must verify all information against the current official text and consult qualified legal, accounting, underwriting, tax, investor-relations, and other professional advisors before acting. Any decision relating to an initial public offering or any securities transaction is made solely at the reader's own risk. Last reviewed: July 11, 2026.
