Section 3. Auditing and Related Professional Practice Standards

Rule 3100. Compliance with Auditing and Related Professional Practice Standards
Rule 3101. Certain Terms Used in Auditing and Related Professional Practice Standards
Rule 3200. Auditing Standards
Rule 3210. Amendments
Rule 3211. Auditor Reporting of Certain Audit Participants
Rule 3300T. Interim Attestation Standards
Rule 3400T. Interim Quality Control Standards
Rule 3500T. Interim Ethics and Independence Standards
Rule 3501. Definitions of Terms Employed in Section 3, Part 5 of the Rules
Rule 3502. Responsibility Not to Knowingly or Recklessly Contribute to Violations
Rule 3520. Auditor Independence
Rule 3521. Contingent Fees
Rule 3522. Tax Transactions
Rule 3523. Tax Services for Persons in Financial Reporting Oversight Roles
Rule 3524. Audit Committee Pre-approval of Certain Tax Services
Rule 3525. Audit Committee Pre-approval of Non-audit Services Related to Internal Control Over Financial Reporting
Rule 3526. Communication with Audit Committees Concerning Independence
Rule 3700. Advisory Groups

Part 1 - General Requirements

Rule 3100. Compliance with Auditing and Related Professional Practice Standards.

A registered public accounting firm and its associated persons shall comply with all applicable auditing and related professional practice standards.

[Effective pursuant to SEC Release No. 34-48730, File No. PCAOB-2003-05 (October 31, 2003)]

Rule 3101. Certain Terms Used in Auditing and Related Professional Practice Standards

(a) The Board's auditing and related professional practice standards use certain terms set forth in this rule to describe the degree of responsibility that the standards impose on auditors.

(1) Unconditional Responsibility: The words "must," "shall," and "is required" indicate unconditional responsibilities. The auditor must fulfill responsibilities of this type in all cases in which the circumstances exist to which the requirement applies. Failure to discharge an unconditional responsibility is a violation of the relevant standard and Rule 3100.

(2) Presumptively Mandatory Responsibility: The word "should" indicates responsibilities that are presumptively mandatory. The auditor must comply with requirements of this type specified in the Board's standards unless the auditor demonstrates that alternative actions he or she followed in the circumstances were sufficient to achieve the objectives of the standard. Failure to discharge a presumptively mandatory responsibility is a violation of the relevant standard and Rule 3100 unless the auditor demonstrates that, in the circumstances, compliance with the specified responsibility was not necessary to achieve the objectives of the standard.

Note: In the rare circumstances in which the auditor believes the objectives of the standard can be met by alternative means, the auditor, as part of documenting the planning and performance of the work, must document the information that demonstrates that the objectives were achieved.

(3) Responsibility To Consider: The words "may," "might," "could," and other terms and phrases describe actions and procedures that auditors have a responsibility to consider. Matters described in this fashion require the auditor's attention and understanding. How and whether the auditor implements these matters in the audit will depend on the exercise of professional judgment in the circumstances consistent with the objectives of the standard.

Note: If a Board standard provides that the auditor "should consider" an action or procedure, consideration of the action or procedure is presumptively mandatory, while the action or procedure is not.

(b) The terminology in paragraph (a) of this rule applies to the responsibilities imposed by the auditing and related professional practice standards, including the interim standards.

[Effective pursuant to SEC Release No. 34-50331, File No. PCAOB-2004-06 (September 8, 2004); SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014); and SEC Release No. 34-75935, File No. PCAOB-2015-01 (September 17, 2015)]

Rule 3200. Auditing Standards.

In connection with the preparation or issuance of any audit report, a registered public accounting firm and its associated persons shall comply with all applicable auditing standards adopted by the Board and approved by the SEC, including, to the extent not superseded or amended by the Board, AICPA Statements on Auditing Standards as in existence on April 16, 2003.

[Effective pursuant to SEC Release Nos 33-8223 & 34-47746 (April 25, 2003); SEC Release No. 34-49624, File No. PCAOB-2003-11 (April 28, 2004); SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014); and SEC Release No. 34-75935, File No. PCAOB-2015-01 (September 17, 2015)]

Rule 3210. Amendments

The provisions of Rule 2205 concerning amendments shall apply to any Form AP filed pursuant to Rule 3211 as if the submission were a report on Form 3.

[Effective pursuant to SEC Release No. 34-77787, File No. PCAOB-2016-01 (May 9, 2016)]

Rule 3211. Auditor Reporting of Certain Audit Participants

Amendments to this rule have been approved by the Securities and Exchange Commission but are not yet effective. The amended rule, effective for audits of financial statements for fiscal years ending on or after December 15, 2024, can be found here.

(a) For each audit report it issues for an issuer, a registered public accounting firm must file with the Board a report on Form AP in accordance with the instructions to that form.

Note 1: A Form AP filing is not required for an audit report of a registered public accounting firm that is referred to by the principal auditor in accordance with AS 1205, Part of the Audit Performed by Other Independent Auditors.

Note 2: Rule 3211 requires the filing of a report on Form AP regarding an audit report only the first time the audit report is included in a document filed with the Commission. Subsequent inclusion of precisely the same audit report in other documents filed with the Commission does not give rise to a requirement to file another Form AP. In the event of any change to the audit report, including any change in the dating of the report, Rule 3211 requires the filing of a new Form AP the first time the revised audit report is included in a document filed with the Commission.

(b) Form AP is deemed to be timely filed if—

1. The form is filed by the 35^th day after the date the audit report is first included in a document filed with the Commission; provided, however, that

2. If such document is a registration statement under the Securities Act, the form is filed by the 10^th day after the date the audit report is first included in a document filed with the Commission.

(c) Unless directed otherwise by the Board, a registered public accounting firm must file such report electronically with the Board through the Board's Web-based system.

(d) Form AP shall be deemed to be filed on the date that the registered public accounting firm submits a Form AP in accordance with this rule that includes the certification in Part VI of Form AP.

[Effective pursuant to SEC Release No. 34-77787, File No. PCAOB-2016-01 (May 9, 2016)]

Rule 3300T. Interim Attestation Standards.

In connection with an engagement (i) described in the AICPA's Auditing Standards Board's Statement on Standards for Attestation Engagements No. 10 (Codification of Statements on Auditing Standards, AT § 101.01 (AICPA 2002)) and (ii) related to the preparation or issuance of audit reports, a registered public accounting firm, and its associated persons, shall comply with the AICPA Auditing Standards Board's Statements on Standards for Attestation Engagements, and related interpretations and Statements of Position, as in existence on April 16, 2003, to the extent not superseded or amended by the Board.

[Effective pursuant to SEC Release Nos 33-8223 & 34-47746 (April 25, 2003); SEC Release No. 34-49624, File No. PCAOB-2003-11 (April 28, 2004); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]

Rule 3400T. Interim Quality Control Standards.

The following rule will be rescinded effective December 15, 2025. A new rule has been approved by the Securities and Exchange Commission but is not yet effective. The new rule, effective on December 15, 2025, can be found here.

A registered public accounting firm, and its associated persons, shall comply with quality control standards, as described in -

(a) the AICPA's Auditing Standards Board's Statements on Quality Control Standards, as in existence on April 16, 2003 (AICPA Professional Standards, QC §§ 20-40 (AICPA 2002)), to the extent not superseded or amended by the Board; and

(b) the AICPA SEC Practice Section's Requirements of Membership (d), (l), (m), (n)(1) and (o), as in existence on April 16, 2003 (AICPA SEC Practice Section Manual § 1000.08(d), (j), (m), (n)(1) and (o)), to the extent not superseded or amended by the Board.

Note: The AICPA SEC Practice Section's Requirements of Membership only apply to those registered public accounting firms that were members of the AICPA SEC Practice Section on April 16, 2003.

Part 5 - Ethics and Independence

Rule 3500T. Interim Ethics and Independence Standards.

Amendments to this rule have been approved by the Securities and Exchange Commission but are not yet effective. The amended rule, effective on December 15, 2025, can be found here.

(a) In connection with the preparation or issuance of any audit report, a registered public accounting firm, and its associated persons, shall comply with ethics standards, as described in the AICPA's Code of Professional Conduct Rule 102, and interpretations and rulings thereunder, as in existence on April 16, 2003 (AICPA Professional Standards, ET §§ 102 and 191 (AICPA 2002)), to the extent not superseded or amended by the Board.

(b) In connection with the preparation or issuance of any audit report, a registered public accounting firm, and its associated persons, shall comply with independence standards –

(1) as described in the AICPA's Code of Professional Conduct Rule 101, and interpretations and rulings thereunder, as in existence on April 16, 2003 (AICPA Professional Standards, ET §§ 101 and 191 (AICPA 2002)), to the extent not superseded or amended by the Board; and

(2) Standards Nos. 2 and 3, and Interpretation 99-1 of the Independence Standards Board, to the extent not superseded or amended by the Board.

Note: The Board's Interim Independence Standards do not supersede the Commission's auditor independence rules. See Rule 2-01 of Reg. S-X, 17 C.F.R.§ 210.2-01. Therefore, to the extent that a provision of the Commission's rule is more restrictive – or less restrictive – than the Board's Interim Independence Standards, a registered public accounting firm must comply with the more restrictive rule.

Rule 3501. Definitions of Terms Employed in Section 3, Part 5 of the Rules

When used in Section 3, Part 5 of the Rules, unless the context otherwise requires:

(a)(i) Affiliate of the Accounting Firm

The term "affiliate of the accounting firm" (or "affiliate of the registered public accounting firm" or "affiliate of the firm") includes the accounting firm's parents; subsidiaries; pension, retirement, investment or similar plans; and any associated entities of the firm, as that term is used in Rule 2-01 of the Commission's Regulation S-X, 17 C.F.R. § 210.2-01(f)(2).

(a)(ii) Affiliate of the Audit Client

The term "affiliate of the audit client" has the same meaning as that term is defined in Rule 2-01 of the Commission’s Regulation S-X, 17 C.F.R. § 210.2-01(f)(4).

(a)(iii) Audit and Professional Engagement Period

The term "audit and professional engagement period" includes both -

(1) The period covered by any financial statements being audited or reviewed (the "audit period"); and

(2) The period of the engagement to audit or review the audit client's financial statements or to prepare a report filed with the Commission (the "professional engagement period") -

(A) The professional engagement period begins when the registered public accounting firm either signs an initial engagement letter (or other agreement to review or audit a client's financial statements) or begins audit, review, or attest procedures, whichever is earlier; and

(B) The professional engagement period ends when the audit client or the registered public accounting firm notifies the Commission that the client is no longer that firm's audit client.

(3) The "audit and professional engagement period" does not include periods ended prior to the first day of the last fiscal year before the issuer first filed, or was required to file, a registration statement or report with the Commission, provided there has been full compliance with applicable independence standards in all prior periods covered by any registration statement or report filed with the Commission.

(a)(iv) Audit Client

The term "audit client" means the entity whose financial statements or other information is being audited, reviewed, or attested and any affiliates of the audit client.

(a)(v) Audit Committee

The term "audit committee" means a committee (or equivalent body) established by and among the board of directors of an entity for the purpose of overseeing the accounting and financial reporting processes of the entity and audits of the financial statements of the entity; if no such committee exists with respect to the entity, the entire board of directors of the entity. For audits of non-issuers, if no such committee or board of directors (or equivalent body) exists with respect to the entity, "audit committee" means the person(s) who oversee(s) the accounting and financial reporting processes of the entity and audits of the financial statements of the entity.

(c)(i) Confidential Transaction

The term "confidential transaction" means -

(1) In general. A confidential transaction is a transaction that is offered to a taxpayer under conditions of confidentiality and for which the taxpayer has paid an advisor a fee.

(2) Conditions of confidentiality. A transaction is considered to be offered to a taxpayer under conditions of confidentiality if the advisor who is paid the fee places a limitation on disclosure by the taxpayer of the tax treatment or tax structure of the transaction and the limitation on disclosure protects the confidentiality of that advisor's tax strategies. A transaction is treated as confidential even if the conditions of confidentiality are not legally binding on the taxpayer. A claim that a transaction is proprietary or exclusive is not treated as a limitation on disclosure if the advisor confirms to the taxpayer that there is no limitation on disclosure of the tax treatment or tax structure of the transaction.

(3) Determination of fee. For purposes of this definition, a fee includes all fees for a tax strategy or for services for advice (whether or not tax advice) or for the implementation of a transaction. These fees include consideration in whatever form paid, whether in cash or in kind, for services to analyze the transaction (whether or not related to the tax consequences of the transaction), for services to implement the transaction, for services to document the transaction, and for services to prepare tax returns to the extent that the fees exceed the fees customary for return preparation. For purposes of this definition, a taxpayer also is treated as paying fees to an advisor if the taxpayer knows or should know that the amount it pays will be paid indirectly to the advisor, such as through a referral fee or fee-sharing arrangement. A fee does not include amounts paid to a person, including an advisor, in that person's capacity as a party to the transaction. For example, a fee does not include reasonable charges for the use of capital or the sale or use of property.

(4) Related parties. For purposes of this definition, persons who bear a relationship to each other as described in section 267(b) or 707(b) of the Internal Revenue Code will be treated as the same person.

(c)(ii) Contingent Fee

The term "contingent fee" means -

(1) Except as stated in paragraph (2) below, any fee established for the sale of a product or the performance of any service pursuant to an arrangement in which no fee will be charged unless a specified finding or result is attained, or in which the amount of the fee is otherwise dependent upon the finding or result of such product or service.

(2) Solely for the purposes of this definition, a fee is not a "contingent fee" if the amount is fixed by courts or other public authorities and not dependent on a finding or result.

(f)(i) Financial Reporting Oversight Role

The term "financial reporting oversight role" means a role in which a person is in a position to or does exercise influence over the contents of the financial statements or anyone who prepares them, such as when the person is a member of the board of directors or similar management or governing body, chief executive officer, president, chief financial officer, chief operating officer, general counsel, chief accounting officer, controller, director of internal audit, director of financial reporting, treasurer, or any equivalent position.

(i)(i) Immediate Family Member

The term "immediate family member" means a person's spouse, spousal equivalent, and dependents.

(i)(ii) Investment Company Complex

The term "investment company complex" has the same meaning as that term is defined in Rule 2-01 of the Commission’s Regulation S-X, 17 C.F.R. § 210.2-01(f)(14).

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006); SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014); and SEC Release No. 34-90930, File No. PCAOB-2020-01 (January 14, 2021)]

Rule 3502. Responsibility Not to Contribute to Violations

A person associated with a registered public accounting firm shall not directly and substantially contribute to a violation by that registered public accounting firm of the Act, the Rules of the Board, the provisions of the securities laws relating to the preparation and issuance of audit reports and the obligations and liabilities of accountants with respect thereto, including the rules of the Commission issued under the Act, or professional standards, by an act or omission that the person knew or should have known would contribute to such violation.

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006); and SEC Release No. 34-100772, File No. PCAOB-2024-04 (Aug. 20, 2024)]

Subpart 1 - Independence

Rule 3520. Auditor Independence

A registered public accounting firm and its associated persons must be independent of the firm's audit client throughout the audit and professional engagement period.

Note 1: Under Rule 3520, a registered public accounting firm or associated person's independence obligation with respect to an audit client encompasses not only an obligation to satisfy the independence criteria applicable to the engagement set out in the rules and standards of the PCAOB, but also an obligation to satisfy all other independence criteria applicable to the engagement, including the independence criteria set out in the rules and regulations of the Commission under the federal securities laws.
Note 2: Rule 3520 applies only to those associated persons of a registered public accounting firm required to be independent of the firm's audit client by standards, rules or regulations of the Board or Commission or other applicable independence criteria.

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]

Rule 3521. Contingent Fees

A registered public accounting firm is not independent of its audit client if the firm, or any affiliate of the firm, during the audit and professional engagement period, provides any service or product to the audit client for a contingent fee or a commission, or receives from the audit client, directly or indirectly, a contingent fee or commission.

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006)]

Rule 3522. Tax Transactions

A registered public accounting firm is not independent of its audit client if the firm, or any affiliate of the firm, during the audit and professional engagement period, provides any non-audit service to the audit client related to marketing, planning, or opining in favor of the tax treatment of, a transaction -

(a) Confidential Transactions - that is a confidential transaction; or

(b) Aggressive Tax Position Transactions - that was initially recommended, directly or indirectly, by the registered public accounting firm and a significant purpose of which is tax avoidance, unless the proposed tax treatment is at least more likely than not to be allowable under applicable tax laws.

Note 1: With respect to transactions subject to the United States tax laws, paragraph (b) of this rule includes, but is not limited to, any transaction that is a listed transaction within the meaning of 26 C.F.R. § 1.6011-4(b)(2).
Note 2: A registered public accounting firm indirectly recommends a transaction when an affiliate of the firm or another tax advisor, with which the firm has a formal agreement or other arrangement related to the promotion of such transactions, recommends engaging in the transaction.

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006)]

Rule 3523. Tax Services for Persons in Financial Reporting Oversight Roles

A registered public accounting firm is not independent of an issuer audit client if the firm, or any affiliate of the firm, during the professional engagement period provides any tax service to a person in a financial reporting oversight role at the issuer audit client, or an immediate family member of such person, unless -

(a) the person is in a financial reporting oversight role at the issuer audit client only because he or she serves as a member of the board of directors or similar management or governing body of the audit client;

(b) the person is in a financial reporting oversight role at the issuer audit client only because of the person's relationship to an affiliate of the entity being audited -

(1) whose financial statements are not material to the consolidated financial statements of the entity being audited; or

(2) whose financial statements are audited by an auditor other than the firm or an associated person of the firm; or

(c) the person was not in a financial reporting oversight role at the issuer audit client before a hiring, promotion, or other change in employment event and the tax services are -

(1) provided pursuant to an engagement in process before the hiring, promotion, or other change in employment event; and

(2) completed on or before 180 days after the hiring or promotion event.

Note: In an engagement for an issuer audit client whose financial statements for the first time will be required to be audited pursuant to the standards of the PCAOB, the provision of tax services to a person covered by Rule 3523 before the earlier of the date that the firm: (1) signed an initial engagement letter or other agreement to perform an audit pursuant to the standards of the PCAOB, or (2) began procedures to do so, does not impair a registered public accounting firm's independence under Rule 3523.

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006); SEC Release No. 34-58415, File No. PCAOB-2008-03 (August 22, 2008); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]

Rule 3524. Audit Committee Pre-approval of Certain Tax Services

In connection with seeking audit committee pre-approval to perform for an issuer audit client any permissible tax service, a registered public accounting firm shall -

(a) describe, in writing, to the audit committee of the issuer -

(1) the scope of the service, the fee structure for the engagement, and any side letter or other amendment to the engagement letter, or any other agreement (whether oral, written, or otherwise) between the firm and the audit client, relating to the service; and

(2) any compensation arrangement or other agreement, such as a referral agreement, a referral fee or fee-sharing arrangement, between the registered public accounting firm (or an affiliate of the firm) and any person (other than the audit client) with respect to the promoting, marketing, or recommending of a transaction covered by the service;

(b) discuss with the audit committee of the issuer the potential effects of the services on the independence of the firm; and

[Effective pursuant to SEC Release No. 34-53677, File No. PCAOB-2006-01 (April 19, 2006); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]

Rule 3525. Audit Committee Pre-approval of Non-audit Services Related to Internal Control Over Financial Reporting

In connection with seeking audit committee pre-approval to perform for an issuer audit client any permissible non-audit service related to internal control over financial reporting, a registered public accounting firm shall -

(a) describe, in writing, to the audit committee of the issuer the scope of the service;

(b) discuss with the audit committee of the issuer the potential effects of the service on the independence of the firm; and

Note: Independence requirements provide that an auditor is not independent of his or her audit client if the auditor is not, or a reasonable investor with knowledge of all relevant facts and circumstances would conclude that the auditor is not, capable of exercising objective and impartial judgment on all issues encompassed within the accountant's engagement. Several principles guide the application of this general standard, including whether the auditor assumes a management role or audits his or her own work. Therefore, an auditor would not be independent if, for example, management had delegated its responsibility for internal control over financial reporting to the auditor or if the auditor had designed or implemented the audit client's internal control over financial reporting.

[Effective pursuant to SEC Release No. 34-56152, File No. PCAOB-2007-02 (July 27, 2007); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]

Rule 3526. Communication with Audit Committees Concerning Independence

A registered public accounting firm must -

(a) prior to accepting an initial engagement pursuant to the standards of the PCAOB -

(1) describe, in writing, to the audit committee of the potential audit client, all relationships between the registered public accounting firm or any affiliates of the firm and the potential audit client or persons in financial reporting oversight roles at the potential audit client that, as of the date of the communication, may reasonably be thought to bear on independence;

(2) discuss with the audit committee of the potential audit client the potential effects of the relationships described in subsection (a)(1) on the independence of the registered public accounting firm, should it be appointed the potential audit client's auditor; and

(3) document the substance of its discussion with the audit committee of the potential audit client.

(b) at least annually with respect to each of its audit clients -

(1) describe, in writing, to the audit committee of the audit client, all relationships between the registered public accounting firm or any affiliates of the firm and the audit client or persons in financial reporting oversight roles at the audit client that, as of the date of the communication, may reasonably be thought to bear on independence;

(2) discuss with the audit committee of the audit client the potential effects of the relationships described in subsection (b)(1) on the independence of the registered public accounting firm;

(3) affirm to the audit committee of the audit client, in writing, that, as of the date of the communication, the registered public accounting firm is independent in compliance with Rule 3520; and

(4) document the substance of its discussion with the audit committee of the audit client.

[Effective pursuant to SEC Release No. 34-58415, File No. PCAOB-2008-03 (August 22, 2008); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]

Part 7 - Establishment of Professional Standards

Rule 3700. Advisory Groups.

(a) Formation.

To assist it in carrying out its responsibility to establish auditing and related professional practice standards, the Board will convene one or more advisory groups, in accordance with Section 103(a)(4) of the Act.

(b) Composition.

Advisory groups, in combination or as sub-groups designated by the Board within one advisory group, will contain individuals with expertise in one or more of the following areas -

(1) accounting;

(2) auditing;

(3) corporate finance;

(4) corporate governance;

(5) investing in public companies; and

(6) other areas that the Board deems to be relevant to one or more auditing or related professional practice standards.

(c) Selection of Members of Advisory Groups.

Members of advisory groups will be selected by the Board, in its sole discretion, based upon nominations, including self-nominations, received from any person or organization.

Note: The Board will announce, from time to time, periods during which it will receive nominations to an advisory group. During those periods, nominations may be submitted by any person or organization, including, but not limited to, any investor, any accounting firm, any issuer, broker, dealer, and any institution of higher learning.

(d) Personal Membership.

Membership in an advisory group will be personal to the individuals selected to serve on the advisory group. A member's functions and responsibilities, including attendance at meetings, may not be delegated to others.

(e) Ethical Duties of Advisory Group Members.

Members of an advisory group shall comply with EC3, EC8(a), EC9, and, with respect to any private publication or public statement about the Board or any advisory group or any of the activities of the Board or any advisory group, EC10 of the Board's Ethics Code.

(f) Ad Hoc Task Forces.

The Board may, in its discretion, establish ad hoc task forces. The membership of such task forces may include, but is not limited to, advisory group members. To the extent not otherwise required, members of ad hoc task forces shall comply with paragraph (e) of this Rule.

[Effective pursuant to SEC Release No. 34-48730, File No. PCAOB-2003-05 (October 31, 2003); and SEC Release No. 34-72087, File No. PCAOB-2013-03 (May 2, 2014)]