CPA AUD Study Guide (2026)
CPA AUD (Auditing and Attestation) is a Core section of the CPA exam, testing auditing standards, procedures, evidence, internal controls, and professional ethics. The exam mixes multiple-choice questions (MCQs) and task-based simulations (TBS) over a 4-hour testing window. The AUD pass rate is roughly 49% (AICPA).
AUD is the most conceptual of the three Core sections. FAR tests your knowledge of accounting standards and REG tests tax rules, but AUD tests how well you understand the audit process from planning through reporting. The questions ask for judgment, not just calculation.
What AUD Covers
The AUD exam covers 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 check whether you know the rules that govern how an auditor behaves.
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.
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. Once you understand how auditors identify, assess, and respond to risk, the rest of the exam clicks into place.
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 it 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
Candidates memorize procedure names without grasping why an auditor would pick one over another. The exam tests judgment: given this risk assessment, what is the right audit procedure? Reason through 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)
The line 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 needs less memorization than FAR or REG but more conceptual reasoning. You have 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 holds up everything else. Work 20 to 30 practice MCQs a day.
Weeks 3 to 4: Evidence and Internal Controls
Cover audit evidence, substantive procedures, tests of controls, and the COSO framework. Give it extra time. 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. Drill scenario-based questions where you pick the correct opinion from a set of facts.
Weeks 7 to 8: Practice Exams
Sit full-length timed practice exams. Pay extra attention to task-based simulations (TBS), which make you apply audit concepts in realistic, multi-step scenarios. Target 80%+ on practice exams before exam day (the passing score is 75).
Task-based simulations on AUD often hand you a scenario and ask you to identify risks, select procedures, or evaluate evidence. They test applied judgment, not memorized facts. Practice TBS on their own; MCQ practice alone will not cut it.
Practice Strategy
Get through at least 500 practice MCQs before exam day. Focus on the reasoning behind the correct answers, not just which answer is right.
When you review a miss, ask: was it a conceptual gap (I did not understand the audit risk model) or a detail slip (I mixed up 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 a question lands, name the risk first, then judge whether the proposed procedure addresses it.
Learn the framework, not the list. AUD has a long list of specific procedures, but they all follow the same logic: assess risk, design a response, gather evidence, form a conclusion. Hold the framework and you can reason through questions you have never seen.
Do not skip ethics. Professional responsibilities and independence show up throughout AUD, both in their own content area and woven into other questions. Block out dedicated 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.