Auditing: Audit Procedures, Evidence, Risk, Internal Controls, Assertions, and Reports
Learn auditing step by step, from audit objectives and planning to risk assessment, internal controls, audit evidence, assertions, sampling, substantive procedures, documentation, and audit reports. Use these guides to understand how auditors evaluate financial information and form conclusions based on sufficient appropriate evidence.
Explore Auditing Topics
Start with the foundations, then move into planning, risk, evidence, controls, assertions, testing, and audit reporting.
Audit Basics
Learn the purpose of an audit, key terminology, audit objectives, responsibilities, and the overall audit process.
Explore Topic →Audit Planning & Risk
Understand planning, risk assessment, materiality, audit strategy, and how auditors focus their work.
Explore Topic →Audit Evidence & Procedures
Learn inspection, observation, inquiry, confirmation, recalculation, reperformance, and analytical procedures.
Explore Topic →Internal Controls
Study control environments, control activities, segregation of duties, walkthroughs, testing, and control deficiencies.
Explore Topic →Audit Assertions
Understand management assertions for transactions, balances, presentation, and disclosure.
Explore Topic →Audit Reports & Opinions
Learn unmodified, qualified, adverse, and disclaimer opinions and the structure of an auditor's report.
Explore Topic →Audit Basics
Explore clear auditing guides, practical examples, and key concepts in this area.
What Is Auditing?
Learn what auditing is, why it is performed, and how it supports confidence in financial information.
Read Guide →Audit vs Accounting
Compare the roles, objectives, responsibilities, and outputs of accounting and auditing.
Read Guide →External Audit
Understand independent financial statement audits performed by external auditors.
Read Guide →Internal Audit
Learn how internal audit evaluates governance, risk management, controls, and operational processes.
Read Guide →Financial Statement Audit
Understand the objective and scope of an audit of financial statements.
Read Guide →Audit Process
Review the major stages from engagement acceptance through planning, testing, completion, and reporting.
Read Guide →Audit Planning and Risk Assessment
Explore clear auditing guides, practical examples, and key concepts in this area.
Audit Planning
Learn how auditors develop an overall strategy and detailed audit plan.
Read Guide →Audit Risk
Understand inherent risk, control risk, detection risk, and their relationship to audit risk.
Read Guide →Risk Assessment Procedures
Review inquiries, analytical procedures, observation, inspection, and other planning procedures.
Read Guide →Audit Materiality
Learn how materiality affects planning, testing, evaluation, and reporting.
Read Guide →Performance Materiality
Understand how performance materiality helps reduce aggregation risk during testing.
Read Guide →Fraud Risk Assessment
Learn how auditors identify and respond to risks of material misstatement due to fraud.
Read Guide →Audit Evidence and Procedures
Explore clear auditing guides, practical examples, and key concepts in this area.
Audit Evidence
Learn the relevance, reliability, sufficiency, and appropriateness of audit evidence.
Read Guide →Substantive Procedures
Understand tests of details and substantive analytical procedures used to detect misstatements.
Read Guide →Tests of Controls
Learn how auditors evaluate whether relevant controls operated effectively.
Read Guide →Audit Confirmation
Understand external confirmations for cash, receivables, liabilities, and other balances.
Read Guide →Analytical Procedures
Learn how relationships and trends are used during planning, substantive testing, and final review.
Read Guide →Audit Documentation
Understand working papers, evidence of procedures performed, conclusions reached, and review requirements.
Read Guide →Internal Controls and Control Testing
Explore clear auditing guides, practical examples, and key concepts in this area.
Internal Control Basics
Learn the purpose and components of internal control over financial reporting.
Read Guide →Segregation of Duties
Understand how separating authorization, custody, recording, and review reduces risk.
Read Guide →Control Activities
Review approvals, reconciliations, access controls, reviews, and other control procedures.
Read Guide →Walkthrough Procedures
Learn how auditors trace transactions through a process to understand controls and identify risk points.
Read Guide →Control Deficiencies
Understand control deficiencies, significant deficiencies, and material weaknesses.
Read Guide →Internal Control Testing
Learn how auditors test the design, implementation, and operating effectiveness of controls.
Read Guide →Audit Assertions
Explore clear auditing guides, practical examples, and key concepts in this area.
Audit Assertions Explained
Understand the assertions auditors use when evaluating transactions, balances, and disclosures.
Read Guide →Existence Assertion
Learn how auditors test whether recorded assets, liabilities, and equity balances actually exist.
Read Guide →Completeness Assertion
Understand procedures used to determine whether required transactions and balances are fully recorded.
Read Guide →Rights and Obligations Assertion
Learn how auditors assess whether the entity has rights to assets and obligations for liabilities.
Read Guide →Valuation and Allocation Assertion
Understand testing for proper measurement, estimates, impairment, and allocation.
Read Guide →Presentation and Disclosure Assertions
Learn how auditors evaluate classification, clarity, occurrence, completeness, and accuracy of disclosures.
Read Guide →Audit Sampling and Testing
Explore clear auditing guides, practical examples, and key concepts in this area.
Audit Sampling
Learn why auditors test samples rather than every transaction and how sampling risk arises.
Read Guide →Statistical Sampling
Understand probability-based selection and evaluation techniques used in audit testing.
Read Guide →Nonstatistical Sampling
Learn how professional judgment is used to determine sample size and evaluate results.
Read Guide →Sampling Risk
Understand the risk that a sample may not represent the full population.
Read Guide →Test of Details
Review substantive tests applied to transactions, balances, and disclosures.
Read Guide →Audit Exceptions
Learn how exceptions are investigated, projected, evaluated, and documented.
Read Guide →Audit Reports and Completion
Explore clear auditing guides, practical examples, and key concepts in this area.
Auditor's Report
Learn the structure and main sections of an independent auditor's report.
Read Guide →Unmodified Audit Opinion
Understand when an auditor concludes that financial statements are fairly presented.
Read Guide →Qualified Audit Opinion
Learn when a material but not pervasive issue leads to a qualified opinion.
Read Guide →Adverse Audit Opinion
Understand when pervasive material misstatements lead to an adverse opinion.
Read Guide →Disclaimer of Opinion
Learn when the auditor cannot obtain enough evidence or cannot form an opinion.
Read Guide →Subsequent Events Review
Understand procedures performed for events occurring after the reporting date and before report issuance.
Read Guide →Essential Auditing Guides and Checklists
Use these supporting resources to connect planning, evidence, assertions, documentation, and completion procedures.
Audit Planning Checklist
Review engagement acceptance, materiality, risk assessment, controls, staffing, timing, and planned procedures.
Audit Evidence Guide
Compare evidence types and understand which sources are generally more persuasive.
Financial Statement Assertions Guide
Map assertions to common balance sheet and income statement audit procedures.
Audit Completion Checklist
Review misstatements, subsequent events, going concern, representation letters, documentation, and reporting.
How the Audit Process Fits Together
Use this overview to connect the main stages of a financial statement audit.
| Audit Stage | Main Focus | Typical Activities | Primary Outcome |
|---|---|---|---|
| Planning | Understand the entity and engagement | Materiality, risk assessment, audit strategy | Focused audit plan |
| Internal Controls | Understand and evaluate relevant controls | Walkthroughs, control design, tests of controls | Control reliance decisions |
| Substantive Testing | Detect material misstatements | Tests of details, confirmations, analytics | Audit evidence for balances and disclosures |
| Completion | Evaluate overall audit results | Misstatements, subsequent events, going concern | Final conclusions |
| Reporting | Communicate the auditor's conclusion | Opinion, basis for opinion, required report sections | Independent auditor's report |
Not Sure Where to Start with Auditing?
Begin with audit objectives and risk, then learn evidence, assertions, internal controls, substantive procedures, and reporting.
Featured Auditing Guides
Explore selected auditing guides covering planning, evidence, controls, assertions, procedures, and reporting.
Latest Auditing Articles
Read the newest guides about audit risk, internal controls, evidence, sampling, assertions, audit procedures, and reports.
Frequently Asked Questions About Auditing
Find quick answers about audit risk, materiality, evidence, assertions, controls, substantive procedures, and audit opinions.
What is auditing?
Auditing is the systematic examination of financial information, records, controls, and evidence to evaluate whether reported information is fairly presented under an applicable framework.
What is the difference between internal and external audit?
Internal audit focuses on governance, risk, controls, and operations from within or on behalf of an organization, while external audit provides an independent opinion on financial statements.
What is audit risk?
Audit risk is the risk that an auditor expresses an inappropriate opinion when financial statements are materially misstated.
What is materiality in auditing?
Materiality is the magnitude of an omission or misstatement that could reasonably influence the decisions of users of the financial statements.
What are audit assertions?
Audit assertions are representations about transactions, balances, presentation, and disclosures that auditors use to design audit procedures.
What is sufficient appropriate audit evidence?
Sufficiency refers to the quantity of evidence, while appropriateness refers to its relevance and reliability.
What is the difference between tests of controls and substantive procedures?
Tests of controls evaluate whether controls operated effectively, while substantive procedures are designed to detect material misstatements directly.
What types of audit opinions are there?
Common audit opinions include unmodified, qualified, adverse, and disclaimer of opinion.
Build a Clear Understanding of the Audit Process
Use Accountant Compass auditing guides to connect risk assessment, internal controls, audit evidence, assertions, testing, documentation, and the final auditor's report.
