CPA AUD Study Guide (2026)

CPA AUD (Auditing and Attestation) is a Core section of the CPA exam, testing knowledge of auditing standards, procedures, evidence, internal controls, and professional ethics. The exam includes multiple-choice questions (MCQs) and task-based simulations (TBS) over a 4-hour testing window. The AUD pass rate is approximately 49% (AICPA).

AUD is the most conceptual of the three Core sections. Where FAR tests your knowledge of accounting standards and REG tests tax rules, AUD tests your understanding of the audit process, from planning through reporting. The questions require judgment, not just calculation.

What AUD Covers

The AUD exam tests four content areas (AICPA):

1. Ethics, Professional Responsibilities, and General Principles (15 to 25%)

AICPA Code of Professional Conduct, independence requirements, quality control standards, professional skepticism, and ethical obligations. These questions test whether you understand the rules that govern auditor behavior.

2. Assessing Risk and Developing a Planned Response (25 to 35%)

The audit risk model, understanding the entity and its environment, assessing risks of material misstatement, and designing audit procedures. This is the conceptual backbone of the exam.

Key Concept

The audit risk model (Audit Risk = Inherent Risk x Control Risk x Detection Risk) is the single most important concept on AUD. Everything else flows from it. If you understand how auditors identify, assess, and respond to risk, the rest of the exam makes sense.

3. Performing Further Procedures and Obtaining Evidence (30 to 40%)

Types of audit evidence, substantive testing, tests of controls, sampling, analytical procedures, and audit documentation. This is the largest content area and covers the "doing" phase of the audit.

You need to understand:

  • Types of evidence and their relative reliability (external vs. internal, documentary vs. oral)
  • Substantive procedures vs. tests of controls and when each is appropriate
  • Sampling methods and how sample size relates to risk
  • The COSO framework for internal controls
Common Trap

Candidates memorize procedure names without understanding why an auditor would choose one over another. The exam tests judgment: given this risk assessment, what is the appropriate audit procedure? Think about the logic, not just the vocabulary.

4. Forming Conclusions and Reporting (15 to 25%)

Audit opinions, emphasis-of-matter paragraphs, going concern evaluations, group audits, reviews, compilations, and other reporting engagements.

The four standard audit opinions:

  • Unmodified (clean opinion, no material misstatements found)
  • Qualified (material misstatement or scope limitation, but not pervasive)
  • Adverse (material and pervasive misstatement)
  • Disclaimer (unable to obtain sufficient evidence)
Key Concept

The distinction between "material" and "material and pervasive" drives the choice between qualified and adverse/disclaimer opinions. This is one of the most frequently tested concepts on AUD.

AUD Compared to Other CPA Sections

| Factor | AUD | FAR | REG |
|--------|-----|-----|-----|
| Primary skill | Judgment and reasoning | Knowledge recall | Rule application |
| Calculation intensity | Low | High | Medium |
| Pass rate | ~49% (AICPA) | ~44% (AICPA) | ~52% (AICPA) |
| Study hours | 80 to 100 | 100 to 120 | 80 to 100 |
| Biggest challenge | Conceptual depth | Volume of material | Detail memorization |

AUD requires less memorization than FAR or REG, but more conceptual reasoning. You need to understand the "why" behind audit procedures, not just the "what."

Study Timeline (8 Weeks)

Most candidates need 80 to 100 hours over 6 to 8 weeks.

Weeks 1 to 2: Risk Assessment and Planning

Start with the audit risk model and planning procedures. This is the framework that supports everything else. Work 20 to 30 practice MCQs per day.

Weeks 3 to 4: Evidence and Internal Controls

Cover audit evidence, substantive procedures, tests of controls, and the COSO framework. Spend extra time here. This is the largest content area (30 to 40% of the exam).

Weeks 5 to 6: Reporting and Ethics

Cover audit opinions, reporting requirements, ethics, and professional responsibilities. Practice scenario-based questions where you identify the correct opinion given a set of facts.

Weeks 7 to 8: Practice Exams

Take full-length timed practice exams. Pay special attention to task-based simulations (TBS), which require applying audit concepts in realistic, multi-step scenarios. Target 80%+ on practice exams before exam day (the passing score is 75).

Common Trap

Task-based simulations on AUD often present a scenario and ask you to identify risks, select procedures, or evaluate evidence. They test applied judgment, not memorized facts. Practice TBS specifically; MCQ practice alone is not sufficient.

Practice Strategy

Aim for at least 500 practice MCQs before exam day. Focus on understanding the reasoning behind correct answers, not just which answer is right.

When reviewing wrong answers, ask: was it a conceptual misunderstanding (I did not understand the audit risk model) or a detail error (I confused the two types of sampling)? The fix is different for each.

FreeFellow offers free CPA AUD practice questions with detailed solutions, three difficulty levels, adaptive practice, and performance analytics by topic.

Tips From Experience

Think like an auditor. Every audit procedure exists to address a specific risk. When you encounter a question, identify the risk first, then evaluate whether the proposed procedure addresses it.

Learn the framework, not the list. AUD has many specific procedures, but they all follow the same logic: assess risk, design a response, gather evidence, form a conclusion. If you understand the framework, you can reason through unfamiliar questions.

Do not skip ethics. Professional responsibilities and independence are tested throughout AUD, both in their own content area and woven into other questions. Budget dedicated study time for the AICPA Code of Professional Conduct.

Free Resources

  • FreeFellow CPA AUD Practice - free practice questions with adaptive difficulty, solutions, and analytics
  • AICPA sample tests - official practice questions in AUD format
  • AICPA Audit and Attest Standards - the source material for audit reporting

Start your AUD preparation with free practice questions on FreeFellow.