CPA candidates frequently ask whether AUD or REG is harder. The answer, perhaps frustratingly, is that it depends on who you are. AUD and REG test fundamentally different skills, appeal to different types of learners, and reward different kinds of preparation. In this article we compare the two sections across every dimension that matters: content, testing style, pass rates, study hours, and strategic considerations. By the end, you should have a clear sense of which section will be more challenging for you personally.
Content Comparison: What Each Section Tests
AUD: Auditing and Attestation
AUD focuses on the professional responsibilities and processes involved in auditing and attestation engagements. The major content areas include:
- Ethics, independence, and professional responsibilities
- Planning an engagement and understanding the entity
- Assessing risk and designing further audit procedures
- Performing procedures and obtaining evidence
- Evaluating audit evidence and forming conclusions
- Preparation, compilation, and review engagements (SSARS)
- Audit reports and modifications
AUD is primarily a conceptual and judgment-based section. There are relatively few calculations. Instead, the exam tests your ability to apply auditing standards, make professional judgments, and understand the logic behind audit procedures.
REG: Taxation and Regulation
REG covers federal taxation of individuals, entities, and property transactions, along with business law and professional ethics. The major content areas include:
- Individual income taxation
- Entity taxation (partnerships, S corporations, C corporations)
- Property transactions (basis, gains, losses)
- Business law (contracts, agency, debtor-creditor, UCC)
- Federal tax procedures and professional ethics (Circular 230)
REG is primarily a rule-based and calculation-intensive section. You need to know specific tax rules, apply them to factual scenarios, and compute correct amounts.
Pass Rate Comparison
The pass rate data provides a clear, if incomplete, picture:
- AUD: Approximately 48 to 52 percent in recent quarters
- REG: Approximately 59 to 62 percent in recent quarters
On the surface, REG appears to be the easier section. But pass rates reflect the aggregate performance of all candidates, including those who are well-suited to the material and those who are not. The relevant question is not which section has a higher pass rate overall, but which section is harder for you.
Testing Style: Conceptual vs. Rule-Based
This is the core difference between AUD and REG, and it is the primary factor that determines which section you will find harder.
AUD: The Ambiguity Factor
AUD questions often present scenarios where you need to select the "best" answer from among several plausible options. There is a layer of professional judgment involved that can feel subjective, especially if you are accustomed to the certainty of accounting rules. Many candidates describe AUD as feeling "tricky" because the answer choices often look similar and the distinctions are subtle.
Simulations on AUD often involve analyzing audit documentation, selecting appropriate procedures, or evaluating internal control deficiencies. They test your ability to think like an auditor, which is a skill that comes more naturally to candidates with audit experience.
REG: The Precision Factor
REG questions tend to have more definitive answers. Either the adjusted basis is $50,000 or it is not. Either the transaction produces ordinary income or capital gain. This precision can be comforting for candidates who prefer clear rules, but it also means there is less room to earn partial credit on questions you are unsure about.
Simulations on REG are calculation-heavy and often require you to work through multi-step tax computations. They reward accuracy and speed, and they punish careless errors.
Which Section Is Harder Based on Your Background
Here is a practical breakdown:
- If you work in audit or have strong audit coursework: AUD will likely feel manageable, and REG may be the harder section for you, especially if you have limited tax exposure.
- If you work in tax or excelled in tax courses: REG will leverage your existing knowledge, and AUD's conceptual style may feel unfamiliar and frustrating.
- If you are a strong test-taker who prefers definitive answers: You may prefer REG's calculation-based style over AUD's judgment-based questions.
- If you are comfortable with ambiguity and professional judgment: AUD's style may suit you, while REG's volume of detailed rules may feel overwhelming.
- If you are a recent graduate with limited work experience: AUD may feel more abstract because you lack the professional context, while REG's concrete rules may be easier to grasp from a textbook.
Study Hours Comparison
Most review courses recommend the following study hour ranges:
- AUD: 250 to 350 hours, typically spread over 6 to 10 weeks
- REG: 250 to 350 hours, typically spread over 6 to 10 weeks
The recommended study hours are similar, which reflects the fact that both sections require substantial preparation even though their content is quite different. Where you fall within those ranges depends on your background and familiarity with the material.
Strategic Considerations for Section Ordering
If you are deciding which of these two sections to take first, consider the following:
- If you plan to take TCP as your discipline, take REG first. The content overlap between REG and TCP is significant, and studying them back-to-back maximizes efficiency.
- If you plan to take ISC as your discipline, consider taking AUD first. AUD and ISC share internal controls and IT-related content that creates useful overlap.
- If you just passed FAR and want momentum, take AUD next. AUD is a common second section because it provides a change of pace from FAR's calculation-heavy content.
- If you are working in tax season, delay REG until after April 15. You will be too mentally fatigued from tax work to study tax effectively during busy season. Take AUD instead.
How Think CPA Approaches Both Sections
Think CPA offers comprehensive preparation for both AUD and REG, designed around how each section actually tests you. Our AUD materials emphasize the professional judgment and scenario analysis skills the exam demands, while our REG materials provide structured rule-based review with intensive calculation practice. Whichever section you take first, having a review course that matches the testing style is essential.
The Verdict
Neither AUD nor REG is universally harder than the other. AUD is harder for candidates who struggle with ambiguity and lack audit experience. REG is harder for candidates who are uncomfortable with detailed tax rules and heavy calculations. The best approach is to assess your own strengths honestly, choose the section that plays to your background, and prepare thoroughly for whichever section you take.