KEY TAKEAWAYS
- Internal audit serves the organization, while external audit serves outside stakeholders. Internal auditors help leadership strengthen risk management and controls; external auditors issue an opinion on the financial statements.
- External auditors must be independent of their clients under SEC rules; internal auditors gain independence by reporting to the audit committee.
- The CPA anchors external audit careers, and the CIA anchors internal audit careers. Public accountants often move into internal audit; the reverse is less common.
- Accountants and auditors earned a median annual wage of $83,680 in May 2025, according to the U.S. Bureau of Labor Statistics.
Internal auditors and external auditors both test controls, review financial information, and report on what they find. At first glance, it can be difficult to see the differences between the two roles, but in practice those differences are hard to miss.
If you’re an accounting or finance professional considering a future in auditing and deciding which direction to take (or thinking about a move from one side to the other), understanding the differences is crucial. The day-to-day work, people you report to, the certifications that carry the most weight, and the long-term career options all vary depending on which side of the audit you’re on.
This guide explores how internal and external auditing compare, including their purpose, scope, independence requirements, and reporting structure, as well as what each path looks like from a career perspective, from the skills employers value to how salaries compare.
WHAT IS AUDITING?
An audit is an objective, evidence-based examination of an organization’s information, processes, or controls. Auditors gather and test evidence, compare what they find against a defined standard, and report their conclusions to the people who rely on them.
Organizations need audits for a simple reason: Decision-makers can’t personally verify everything themselves. Boards, executives, investors, lenders, and regulators all depend on financial reports and operating processes they didn’t create, and audits give those groups a credible basis for trusting the numbers, a way to spot risks early, and data to hold management accountable against.
The profession splits into two main branches, internal and external auditing, based on who performs the audit and who the audit ultimately serves.
What Is Internal Auditing?
Internal auditing is performed by an organization’s own team (or by an outside firm hired to act as a team) to evaluate how well the business manages risk, maintains controls, and governs itself. The Institute of Internal Auditors (IIA), which sets the profession’s Global Internal Audit Standards, defines its purpose as strengthening an organization’s ability to create, protect, and sustain value by giving the board and management independent, risk-based, and objective assurance, advice, insight, and foresight.
In other words, internal audit looks forward as well as back. It’s intended to help leadership improve the way they run the organization, not just to confirm that last year’s numbers add up.
What Is External Auditing?
External auditing is performed by an independent CPA firm that is not part of the organization being audited. In a financial statement audit, the auditor’s objective is to obtain reasonable assurance that the financial statements are free of material misstatement, whether due to error or fraud, and to issue a report expressing an opinion on whether those statements are presented fairly in conformity with the applicable financial reporting framework, according to the Public Company Accounting Oversight Board’s (PCAOB) AS 1000.
Publicly traded companies are required to have their financial statements audited, and many privately held companies and nonprofits undergo external audits because lenders, investors, or funders require them.
INTERNAL AUDIT VS. EXTERNAL AUDIT: DIFFERENCES EXPLAINED
The biggest difference between internal and external audit comes down to one question: Who is the audit for? Internal audits serve the organization’s own leadership and board. External audits serve outside stakeholders who need assurance that the financial statements are trustworthy. Nearly every other difference between the two audit types stems from this distinction.
Purpose and Objectives
Internal audits exist to help an organization achieve its objectives. That includes strengthening governance, risk management, and controls; improving decision-making; and protecting the organization’s reputation. For example, an internal audit team might evaluate whether a new procurement process is working, whether cybersecurity controls are adequate, or whether a business unit is complying with company policy.
External audits have a narrower, more defined purpose: to determine whether the financial statements are presented fairly in all material respects and issue a formal opinion. Per the PCAOB, a properly conducted audit enhances the confidence that investors and other stakeholders have in a company’s financial statements.
Differences in Scope, Timing, Independence, and Reporting
- Scope: Internal audit’s scope is broad and set by the organization’s risk priorities. It can cover financial controls, operations, IT, compliance, fraud, and strategic risks. External audit’s scope centers on the financial statements and, for many public companies, internal control over financial reporting.
- Timing: Internal audit works year-round from a risk-based audit plan, with engagements running continuously. External audit follows the client’s reporting cycle, typically an annual audit, with reviews of quarterly financial information for public companies. For calendar-year companies, that concentrates the heaviest work within the first few months of the year.
- Independence: External auditors must be independent of their clients “both in fact and in appearance” under the SEC’s Rule 2-01 of Regulation S-X, which restricts financial, employment, and business relationships between auditors and audit clients. The Sarbanes-Oxley Act (SOX) also bars external auditors from providing certain nonaudit services to public companies, including bookkeeping and internal audit outsourcing. Internal auditors, by contrast, are employees (or contractors) of the organization they audit. Their independence comes from how the function is positioned. The IIA notes that internal audits are most effective when they are independently positioned with direct accountability to the board and its auditors are free from undue influence.
- Reporting: Internal audit reports go to management and the board’s audit committee, often with recommendations and agreed-upon action plans. External audits produce a formal auditor’s report that is included with the company’s financial statements and available to shareholders, lenders, and regulators.
Who Internal and External Auditors Report To
Internal audits typically use a dual reporting structure. The chief audit executive (CAE) reports functionally to the board’s audit committee, which approves the audit plan and oversees the function’s work, and administratively to a senior executive for day-to-day matters. The IIA recommends the CEO for the administrative supervisor role. This way, the CAE holds a clearly senior position, although many CAEs report administratively to the organization’s CFO.
External auditors of public companies report directly to the audit committee. Under SEC rules implementing Section 301 of the Sarbanes-Oxley Act, the audit committee of a publicly traded company has direct, primary responsibility for the relationship with its independent auditor, including dispute resolution. Within the audit firm, staff and seniors report up through managers to the engagement partner, who is responsible for signing the opinion.
What Do Internal and External Auditors Do?
Common responsibilities for internal auditors include:
- Creating and executing a risk-based annual audit plan
- Testing the design and effectiveness of internal controls, including SOX controls at public companies
- Conducting operational audits to identify inefficiencies or process gaps
- Reviewing IT systems, data security, and access controls
- Investigating potential fraud or policy violations
- Reporting findings and recommendations to management and the audit committee
- Following up to confirm that agreed-upon corrective actions were taken
Internal auditors may also serve as advisors, helping leadership think through emerging risks before they become problems.
External auditors tend to work across a roster of clients, often spanning several industries, and typically:
- Plan the audit and assess the risk of material misstatement
- Test account balances, transactions, and disclosures
- Evaluate accounting estimates and management judgments
- Test internal control over financial reporting for public company clients
- Document evidence in audit workpapers
- Communicate findings to management and the audit committee
- Support the engagement partner in issuing the audit opinion
Internal vs. External Auditor Comparison
| Internal Auditor | External Auditor | |
| Employer | The organization being audited (or a firm it hires to perform an internal audit) | An independent CPA firm |
| Primary audience | Management and the board’s audit committee | Shareholders, lenders, regulators, and the audit committee |
| Purpose | Improve governance, risk management, and controls | Issue an opinion on the fairness of the company’s financial statements |
| Scope | Financial, operational, IT, compliance, fraud, and strategic risk | Financial statements and, for many public companies, internal control over financial reporting |
| Timing | Year-round, based on a risk-based audit plan | Annual audit with quarterly reviews for public companies; peak workload after year-end |
| Independence | Organizational independence through reporting to the board | Required independence from the client under SEC, PCAOB, and AICPA rules |
| Reports to | Audit committee (functionally) and a senior executive (administratively) | Engagement partner within the firm; audit committee for public company clients |
| Governing standards | IIA Global Internal Audit Standards | PCAOB (public companies); AICPA standards (private companies) |
| Certifications | Certified Internal Auditor (CIA) | Certified Public Accountant (CPA) |
INTERNAL AUDITOR VS. EXTERNAL AUDITOR CAREER PATHS
Both career paths start with a similar foundation (typically a bachelor’s degree in accounting or a related field), and both reward strong analytical and communication skills. Where they diverge is in the technical skills that are most important, the certifications that carry the most weight, and the path each leads over time.
Skills Needed for Internal Auditing Roles
Internal auditors need a broad understanding of how a business operates, not just how it accounts for transactions. Employers typically look for:
- Risk assessment expertise and the ability to prioritize audit work based on what’s most important to the organization
- Knowledge of internal control frameworks such as those established by COSO
- Business and operational acumen across functions such as procurement, HR, and IT
- Data analytics skills to test full populations of transactions rather than samples
- Strong writing and presentation skills to communicate findings to executives and the audit committee
- Diplomacy and judgment, as internal auditors often recommend changes to colleagues’ processes
The Certified Internal Auditor (CIA) certification is the profession’s most widely recognized credential. Candidates with a bachelor’s degree need two years of qualifying experience to be eligible.
Skills Needed for External Auditing Roles
External auditors need extensive technical accounting knowledge and the discipline to work efficiently against strict deadlines. Employers typically look for candidates with:
- Strong command of U.S. Generally Accepted Accounting Principles (GAAP) and the auditing standards established by the AICPA and PCAOB
- Attention to detail and professional skepticism when evaluating management’s estimates
- Clear, thorough workpaper documentation
- Time management across multiple client engagements and deadlines
- Client service skills
- Proficiency with audit software and data analytics tools
The Certified Public Accountant (CPA) license is a prerequisite for advancement in external auditing, as it qualifies professionals to prepare and certify reports for SEC filings. Licensing requirements are set by each state’s board of accountancy.
Salary Considerations for Internal and External Auditors
While the U.S. Bureau of Labor Statistics (BLS) doesn’t separate internal and external auditors in its wage data, its figures for accountants and auditors provide a useful baseline. In May of 2025 (when the most recent data became available) the median annual wage for accountants and auditors was $83,680, with the top 10% earning more than $144,090.
Salary data for specific job titles shows pay at the staff and senior levels falling in a similar range for both internal and external auditors, with the largest salaries at the leadership levels. According to Payscale data as of October 2026:
- Internal auditors earn an average base salary of $70,577, with most earning between $53,000 and $95,000.
- Senior audit associates, a common external audit title in public accounting firms, earn an average base salary of $77,333, with most earning between $65,000 and $88,000.
- Senior internal auditors earn an average base salary of $91,058, with most earning between $71,000 and $111,000.
- Internal audit directors average $145,208 in base salary, with most earning between $103,000 and $196,000.
Compensation in either path depends on employer size, industry, location, and credentials. In external audit roles, raises tend to come with promotions, and partners share in firm profits rather than earning a salary alone. In internal audit careers, pay generally increases with the size and regulatory complexity of the organization.
Career Growth Opportunities in Each Path
Internal audit paths typically progress from staff auditor to senior auditor, audit manager, audit director, and, ultimately, chief audit executive. Because internal auditors see how every part of the business operates, many also move into risk management, compliance, controllership, or broader finance leadership roles.
External auditors usually follow a different path, moving from associate to senior, manager, senior manager, and partner. The road to partner is long and competitive, but external audit experience is highly portable. According to the BLS, public accountants often transition into management, accounting or internal auditing, while it’s less common for internal auditors to move into public accounting. For many professionals, that flexibility makes external audit a strong starting point.
HOW INTERNAL AND EXTERNAL AUDITORS WORK TOGETHER
Internal and external auditors have different jobs, but that doesn’t mean they work independently of each other. At a well-governed organization, the two disciplines coordinate closely, share information, and report to the same audit committee.
Additionally, external auditors are allowed to factor internal audit’s work into their own audits. The PCAOB’s AS 2605, Consideration of the Internal Audit Function, sets out how an external auditor evaluates an internal audit function and decides whether to use its work. Before relying on it, the external auditor assesses the internal audit team’s competence and objectivity. In some cases, internal auditors can also provide direct assistance by performing procedures under the external auditor’s supervision.
In practice, that collaboration often entails:
- Sharing audit plans so the two teams avoid duplicating work
- Coordinating SOX control testing and timelines
- Communicating identified control deficiencies or fraud risks
- Meeting jointly or separately with the audit committee
That said, there are firm limits. The external auditor remains solely responsible for its audit opinion and must make its own judgments. And under the Sarbanes-Oxley Act, a public company’s external auditor can’t also serve as its outsourced internal audit provider, keeping the roles clearly separate.
How Both Roles Support Organizational Compliance and Risk Management
Think of the two functions as providing complementary layers of protection. Internal audit works continuously inside the organization, identifying weaknesses in controls, operations, and compliance before they become larger issues. External audit provides an independent check on the end product, giving investors, lenders, and regulators confidence that the financial statements are reliable.
The relationship is especially visible in SOX compliance at public companies. Management must assess the effectiveness of its internal control over financial reporting under Section 404(a), work that internal audit often supports through control testing. For companies subject to Section 404(b), the external auditor then attests to those controls. The audit committee oversees both efforts, bringing the two perspectives together to inform the board’s view of risk.
CHOOSING THE RIGHT AUDIT CAREER PATH
If you’re considering a future in auditing, neither path is objectively “better.” The right choice mostly depends on where your interests lie, what kind of work is most appealing to you, your schedule preferences, and where you see yourself 10 years from now.
When to Choose an External Auditor Career
External audit offers fast, broad exposure. You’ll see how many different companies operate, develop your technical accounting skills, and work toward CPA licensure alongside experienced professionals. The tradeoff is pace, with workloads peaking after year-end, client deadlines driving the calendar, and some roles involving travel.
External audit may be a strong fit if you:
- Want to earn your CPA and lay a technical accounting foundation early
- Enjoy variety and learning new industries
- Are interested in partnership or a long-term public accounting career
- Want to keep your career options open
When a Career as an Internal Auditor May Make More Sense
Internal audit offers depth instead of breadth. You’ll get to know one organization’s people, systems, and risks, and you’ll often have direct exposure to senior leadership and the audit committee. Work is spread throughout the year according to the audit plan, which usually means a more predictable schedule than at a public accounting firm.
Internal audit may be the right fit if you:
- Are more interested in how a business operates than in financial statements alone
- Want to influence decisions and see your recommendations put into action
- Prefer a steadier, more predictable workload
- Are aiming for leadership roles in risk, compliance, or corporate finance
Which Audit Career Path May Be Right for Different Professionals?
- Recent graduates and early-career accountants may benefit from starting in external audit. The CPA track, technical training, and multi-industry exposure build skills and experience that transfer well, and moving from public accounting to internal audit is a common next step.
- Experienced external auditors at the senior or manager level who want more predictable hours, proximity to business decisions, or a single organization to invest in are often well-positioned to make the switch to internal audit roles. Their SOX, controls, and financial reporting experience is directly relevant.
- Internal auditors who want to grow into broader leadership can pursue the CAE track or move laterally into risk management, compliance, or finance leadership. Those interested in specializing can concentrate on gaining expertise in IT audit, cybersecurity, or fraud.
- Career changers from operations, IT, or compliance roles may find internal audit the more accessible entry point, since internal audit requires business and technical knowledge in addition to accounting expertise.
FIND YOUR NEXT AUDIT ROLE WITH KBW FINANCIAL STAFFING & RECRUITING
Whether you’re ready to make the move from public accounting to internal audit or looking for the next step in your external audit career, the right opportunity depends on finding an employer whose day-to-day reality matches your professional goals.
KBW Financial Staffing & Recruiting connects accounting and finance professionals with leading companies and CPA firms across New England. Our recruiters personally qualify every employer before presenting you with an opportunity, so you can explore your options confidently and with a clear picture of what each role involves.
Submit your resume or get in touch with our team to start the conversation.
FREQUENTLY ASKED QUESTIONS
Do internal auditors need to be CPAs?
Internal auditors don’t need to be CPAs, though many hold the license. The Certified Internal Auditor (CIA), issued by the Institute of Internal Auditors (IIA), is the profession’s primary credential. A CPA is still valuable in internal audit, especially for roles focused on financial controls and SOX compliance, or for professionals who may later move into controllership or other finance leadership roles.
How do I move from external audit to internal audit?
Moving from external audit to internal audit usually starts with highlighting the experience the two roles share: controls testing, SOX work, risk assessment, and communicating findings to management. Targeting companies in industries you’ve already audited helps, since that knowledge transfers directly. Your external audit experience also counts toward the experience requirement for the Certified Internal Auditor credential.
Is internal audit a dead-end career path?
Internal audit isn’t a dead-end career path; for many professionals, it’s a launching point. Internal auditors see how every part of an organization operates and regularly present to senior leadership and the audit committee. Beyond the chief audit executive role, internal auditors move into risk management, compliance, controllership, and finance leadership.
What’s the difference between in-house internal audit and internal audit consulting?
In-house internal auditors work for the single organization they audit, while internal audit consultants work for CPA or advisory firms that provide outsourced or co-sourced internal audit services to multiple clients. In-house roles build deep knowledge of one business and lead more directly toward the chief audit executive role. Consulting roles offer more variety across industries, along with greater client service demands and, often, more travel.
