When an audit committee needs to choose an SEC auditor, the decision has consequences for financial reporting, regulatory compliance, audit quality, and the company’s relationship with investors. An effective audit firm request for proposal (RFP) turns that decision into a structured comparison of qualifications, independence, issuer experience, team capacity, and fees - not a contest to find the lowest quote.
For public companies and IPO candidates, the right independent audit firm must fit the company’s specific accounting risks and reporting schedule. This guide explains how audit committees can build a shortlist, evaluate PCAOB registered audit firms, issue an RFP, compare finalists, and document their decision. It includes a practical SEC auditor selection checklist and reusable RFP framework.
Who Selects an SEC Auditor - and Why the Audit Committee Leads
For a listed issuer, the audit committee is directly responsible for the appointment, compensation, retention, and oversight of the independent registered public accounting firm. Management can coordinate the search and provide operational details, but the selection and oversight responsibility rests with the audit committee. The auditor reports directly to that committee.
The committee should set its selection criteria before receiving proposals, obtain evidence from each candidate, conduct partner-level interviews, and document the basis for its decision. A board or shareholder ratification process, where used, does not replace the committee’s applicable responsibilities.
When to Issue an Audit Firm RFP
The company is preparing for an IPO or another SEC registration.
The incumbent auditor has resigned, been dismissed, or may not have sufficient issuer capacity.
A merger, acquisition, cross-border expansion, or new technical accounting issue changes audit complexity.
The committee is periodically evaluating service quality, engagement resources, and fees.
For an IPO-specific checklist, see MBP Global’s guide to choosing an auditor for pre-IPO audit readiness: https://www.mbpgloballlp.com/insight-and-news/how-to-choose-independent-auditor-pre-ipo
Step 1: Confirm PCAOB Registration and Regulatory Fit
SEC issuer audits generally require an independent PCAOB-registered accounting firm using applicable PCAOB auditing standards. The phrase “SEC-registered audit firm” is often used informally; the appropriate firm-registration check is with the PCAOB, alongside verification of applicable SEC and PCAOB independence requirements.
How to Verify a Registered Public Accounting Firm
Search the official PCAOB Registered Firms directory by legal name and location.
Read the firm summary, available inspection reports, and published disciplinary information.
Use PCAOB AuditorSearch to review reported public company audit engagements, engagement partners, and participation of other firms.
Confirm the proposed legal contracting entity, engagement partner, offices, and appropriate staffing.
Ask whether the team has handled issuers of similar scale and complexity.
Registration is a threshold qualification, not a certification of audit quality. A firm may be registered but not have the industry experience, capacity, or independence needed for a specific issuer.
Step 2: Check Independence Before Comparing Proposals
A technically strong firm may still be ineligible if its relationships or prior services compromise independence. Review financial and business relationships, employment connections, prior bookkeeping or accounting work, and other restricted non-audit services. For IPO candidates, this review may need to encompass historical periods included in a registration statement.
Audit Committee Independence Questions
What services have you and your network firms provided to our company, subsidiaries, and relevant affiliates?
Were any prohibited or potentially conflicting services performed in relevant periods?
What is the process for annual independence confirmations and identifying new threats?
How are permissible non-audit services submitted for required audit committee preapproval?
Audit committee preapproval does not make a prohibited service permissible. For examples, review: https://www.mbpgloballlp.com/insight-and-news/sec-auditor-independence-rules
Step 3: Evaluate PCAOB Inspection Reports and Audit Experience
Inspection history is useful but should be read carefully. PCAOB inspections review portions of selected engagements, and the selection is partly risk-based. Findings do not necessarily represent a firm-wide error rate or establish that every audit by that firm is deficient. Inspect the type, repetition, recency, and remediation of issues rather than relying on a single headline number.
What to Ask About Inspection Findings
Which relevant inspection themes apply to the services we are procuring?
What changes have been made to methodology, supervision, training, or quality control?
How does the firm monitor recurring issues and engagement quality?
What specialists and quality reviewers will support our engagement?
Use PCAOB AuditorSearch to assess whether the proposed engagement team has experience with comparable SEC issuers; consider industry, international structure, accounting complexity, and engagement size - not just number of clients.
Step 4: Define the Audit Firm RFP Scope
A strong RFP gives every candidate the same material facts and requests comparable responses. Without a common scope, a low fee may simply exclude work another bidder assumed was necessary.
Company Information to Provide
Issuer status, listing or planned IPO date, fiscal year-end, and required audit periods.
Annual revenue range, consolidated entities, operating locations, and significant acquisitions.
Financial reporting framework, SEC filing timetable, and planned financings.
Known complex accounting matters: ASC 606, leases, equity instruments, goodwill, tax, or consolidation.
Current ICFR/SOX status, known deficiencies, and relevant system changes.
Required quarterly reviews, comfort-letter needs, and anticipated additional services.
Known reporting constraints and preferred communication cadence.
Information to Require From Each Bidder
PCAOB registration identity and firm structure.
Relevant issuer and industry experience, with the proposed partner biography.
Engagement staffing chart, specialist availability, and quality review approach.
Audit methodology, risk assessment approach, and information requests.
Timeline by milestone, including management deliverables and escalation plans.
Independence representation and identification of potential conflicts.
Itemized fee proposal, assumptions, exclusions, billing terms, and change-order policy.
References or comparable engagement summaries where disclosure is appropriate.
Reusable Audit Firm RFP Template
Audit committees can copy the following outline into a formal request for proposal. It is a starting template and should be adapted with counsel and management to the issuer’s circumstances.
RFP section | What to request |
1. Background | Issuer description, business, structure, timeline, key financial reporting challenges |
2. Mandatory qualifications | PCAOB registration, independence, applicable regulatory qualifications |
3. Engagement scope | Periods, entities, financial statement audit, reviews, and ICFR audit if applicable |
4. Audit approach | Risk assessment, methodology, specialists, global coordination, quality review |
5. Engagement team | Partner, manager, staff, capacity, succession and partner rotation considerations |
6. Timeline | Planning, PBC requests, fieldwork, audit committee updates, reporting milestones |
7. Fees | Base fee, interim reviews, ICFR, travel, out-of-scope rates, changes |
8. Evidence of experience | Comparable SEC engagement work, inspection-history response, references |
9. Governance | Audit committee communications, issue escalation, reporting arrangements |
10. Submission | RFP due date, interview format, single contact point, decision schedule |
Step 5: Compare Mid-Tier vs Big 4 SEC Auditors
Firm size can influence geographic coverage, specialized resources, engagement economics, and partner access - but no category is automatically the best choice. A multinational issuer with complicated operations may prioritize large global teams; a mid-market public company may place greater weight on accessible senior leadership and an engagement team accustomed to its size. Both approaches require evidence.
Evaluation factor | Questions to ask |
Technical depth | Does the proposed team have relevant SEC and industry expertise? |
Global coordination | Can the firm cover relevant subsidiaries and component auditors? |
Partner involvement | Who makes difficult accounting and audit judgments and how often are they available? |
Capacity | Can the team meet required reporting dates without overpromising? |
Fee transparency | Are scope assumptions and additional charges explicit? |
Fit | Does the firm have examples of similar complexity, rather than only brand recognition? |
A useful next read is MBP Global’s article on public vs private company auditing: https://www.mbpgloballlp.com/insight-and-news/public-company-audit-vs-private-company-audit
Step 6: Perform an SEC Audit Firm Fee Comparison
Audit fees depend on business complexity, subsidiaries, internal controls, accounting estimates, reporting deadlines, required historical periods, and specialist needs. Compare proposals on a normalized scope rather than selecting only the lowest nominal amount.
Fee Comparison Checklist
Are the annual audit, Form 10-Q reviews, and any ICFR attestation separately identified?
What travel, component auditor, specialist, and out-of-pocket expenses are included?
What financial statements and fiscal periods are included?
What triggers additional fees and who approves a scope change?
What assumptions depend on the quality and timeliness of management’s PBC documents?
Is the billing schedule aligned to major engagement milestones?
For the related engagement process, review MBP Global’s financial statement audit guide: https://www.mbpgloballlp.com/insight-and-news/what-to-expect-financial-statement-audit
Step 7: Score, Interview and Document the Decision
The audit committee should agree on weighted criteria before reviewing responses. The example below is a customizable decision tool - not a mandated SEC or PCAOB formula.
Criterion | Illustrative weight |
PCAOB/SEC qualifications and independence (pass/fail eligibility) | Mandatory |
Issuer and industry experience | 25% |
Engagement partner and team quality | 20% |
Audit approach and quality controls | 20% |
Capacity and reporting timetable | 15% |
Communication and audit committee fit | 10% |
Fee transparency and value | 10% |
For each scored area, rate candidates consistently (for example 1–5), multiply by the weighting, and record supporting evidence. Do not score a firm that fails mandatory registration or independence checks as though a low fee could compensate.
Finalist Interview Questions
What risks would you prioritize in our first audit planning meeting?
What similar issuer engagements has the proposed partner personally led?
How will you communicate an unexpected accounting issue or material weakness?
What is the realistic timetable, and what would put it at risk?
How does your team respond to PCAOB inspection findings?
How do you ensure suitable specialist availability?
What will management need to prepare before fieldwork?
What are your principal assumptions and fee-change triggers?
SEC Auditor Selection Checklist for the Audit Committee
Define the reporting and engagement scope.
Confirm which body has selection authority under applicable rules.
Verify PCAOB registration and independence.
Review inspection and disciplinary information in context.
Evaluate issuer audit and relevant industry experience.
Identify the proposed engagement partner and specialists.
Compare written approaches, milestones, and communication.
Normalize audit fees and exclusions.
Conduct finalist interviews with consistent questions.
Document selection rationale and formal approvals.
Finalize the engagement letter and audit committee communication plan.
If replacing an auditor, evaluate Form 8-K Item 4.01 and related disclosure duties.
Switching SEC Auditors: Additional Considerations
Replacing an incumbent firm requires more than an RFP. The company should identify applicable Form 8-K Item 4.01 reporting requirements, disagreements and reportable events, prior auditor communications, financial statement periods affected, and timing for successor audit procedures. The audit committee should coordinate with legal counsel and the incoming and outgoing firms while preserving independence and proper oversight.
Further reading: https://www.mbpgloballlp.com/insight-and-news/sec-filing-requirements-10-k-10-q-8-k
Common Mistakes When Choosing SEC Auditors
Selecting on Price Without Normalizing Scope
An incomplete proposal can look attractive until additional audit periods, specialist work, or quarterly reviews are added. Require itemized scope assumptions.
Treating PCAOB Registration as a Quality Guarantee
Registration is a minimum qualification. Audit quality, capacity, independence, and experience still require evaluation.
Ignoring the Proposed Engagement Team
Compare the people assigned to the work, not just the firm brand. Ask about partner oversight, availability, and turnover.
Waiting Until SEC Deadlines Are Close
Late auditor selection compresses planning, PBC requests, and issue resolution. Set milestones early and allow time for transition risk.
How MBP Global LLP Fits Into an Audit Firm RFP
MBP Global LLP provides audit and assurance services relevant to SEC reporting companies and businesses preparing for capital markets transactions. Audit committees evaluating potential firms should independently verify the proposed firm’s registration, independence, relevant experience, engagement resources, and suitability for the company’s particular reporting needs.
MBP Global’s related resources can help an audit committee frame its requirements before requesting a proposal. Learn about its PCAOB and SEC assurance work on the Audit & Assurance Services page: https://www.mbpgloballlp.com/audit-assurance-sevices
Call to action: If your company is preparing an audit firm RFP, planning an IPO, or reviewing its current independent auditor, contact MBP Global LLP to discuss engagement scope, reporting deadlines, and the audit qualifications needed for your circumstances: https://www.mbpgloballlp.com/
Frequently Asked Questions About Choosing an SEC Auditor
Who appoints the external auditor of a listed company?
The audit committee is directly responsible for the appointment, compensation, retention, and oversight of the independent auditor under applicable U.S. listed-issuer requirements.
How do I choose an SEC auditor?
Verify PCAOB registration and independence, evaluate issuer and industry experience, review inspection information carefully, compare the proposed partner and team, and request written, comparable audit proposals.
Does the SEC maintain a list of approved audit firms?
The PCAOB maintains the official public directory of registered firms. SEC issuer eligibility depends on applicable registration, independence, and professional requirements; being listed in the directory is not an SEC endorsement.
Are mid-tier audit firms allowed to audit SEC issuers?
Yes, provided they meet applicable registration, independence, and professional requirements and can perform the engagement under relevant standards. Firm size alone does not determine eligibility.
How should audit committees use PCAOB inspection reports?
Read them as evidence about selected audit work and firm quality-control issues. Consider findings in context and ask the firm about remediation. They do not provide comprehensive assurance about every audit.
What belongs in an audit firm RFP?
Provide issuer background, reporting periods, complexity, and timing. Require candidate qualifications, independence information, proposed team, methodology, milestones, detailed fees, and scope exclusions.
Can the current auditor help select its replacement?
The audit committee should control selection and oversight, obtaining appropriate information from relevant parties while considering independence, confidentiality, and transition requirements.
Should an IPO candidate use a PCAOB-registered audit firm?
For financial statements audited for a typical U.S. issuer SEC registration statement, the firm generally must be PCAOB-registered and meet applicable independence and audit standards.
Conclusion: Make Auditor Selection Evidence-Based
The most effective way to choose an SEC auditor is to run a consistent, documented audit firm RFP process. Start with PCAOB registration and independence, evaluate real issuer experience and inspection information, interview the assigned team, normalize fee proposals, and record the audit committee’s decision. A well-designed process helps the company prioritize audit quality and reliable financial reporting rather than selecting on cost or name recognition alone.
