Auditing and Ethics · Nature, Objective and Scope of Audit

SA 200 and Basic Principles Governing an Audit

Updated 4 October 2026 · Fact-checked

SA 200 sets the overall objectives of an independent auditor: obtain reasonable assurance that the financial statements are free from material misstatement, and report on them as the SAs require. To do this, you follow ethical requirements, apply professional skepticism and judgment, and gather sufficient appropriate audit evidence.

Understand SA 200 and Basic Principles Governing an Audit

SA 200, Overall Objectives of the Independent Auditor and the Conduct of an Audit in Accordance with Standards on Auditing, is the base standard. It tells you what an audit is trying to achieve and what the auditor must do to achieve it. All other SAs sit on top of it.

The auditor has two overall objectives. First, to obtain reasonable assurance about whether the financial statements as a whole are free from material misstatement, whether due to fraud or error. This lets the auditor express an opinion on whether the statements are prepared, in all material respects, in accordance with the applicable financial reporting framework. For a fair presentation framework, the opinion is on whether the statements give a true and fair view (or present fairly, in all material respects). Second, to report on the financial statements and communicate as the SAs require, in line with the auditor's findings.

If reasonable assurance cannot be obtained and a qualified opinion in the auditor's report is insufficient in the circumstances, the auditor shall disclaim an opinion or withdraw from the engagement, where withdrawal is possible under applicable law or regulation.

Reasonable assurance is a high level of assurance, but not absolute. SA 200 recognises inherent limitations of an audit. These arise from the nature of financial reporting, the nature of audit procedures, and the need for the audit to be conducted within a reasonable period of time and at a reasonable cost. So an audit cannot guarantee that no misstatement exists.

Three working principles support the objectives. Ethical requirements: you comply with relevant ethical requirements, including independence, under the Code of Ethics. Professional skepticism: a questioning mind, alert to conditions that may indicate misstatement, and a critical assessment of evidence. Professional judgment: applying training, knowledge and experience to decisions on materiality, risk, nature, timing and extent of procedures, and evaluating evidence.

Finally, the auditor must obtain sufficient appropriate audit evidence to reduce audit risk to an acceptably low level. Sufficiency is about quantity. Appropriateness is about quality, meaning relevance and reliability. The auditor must also comply with all SAs relevant to the audit, and must not state compliance with SAs unless all relevant requirements are met.

Key rules to remember

Overall objectives (two parts): Objective 1 = reasonable assurance on material misstatement-free statements and opinion on framework compliance or true and fair view; Objective 2 = report and communicate as per SAs; Write both parts. Many students remember only the first.
Audit evidence: Audit evidence = Sufficiency (quantity) + Appropriateness (relevance + reliability); Higher assessed risk needs more evidence. Poorer quality evidence needs more quantity, but more quantity does not cure poor quality.
Audit risk: Audit risk is a function of the risks of material misstatement (RMM) and detection risk; The auditor works to reduce audit risk to an acceptably low level. RMM comprises inherent risk and control risk. SA 200 does not prescribe a formula, and RMM may be assessed in quantitative or non-quantitative terms. Any multiplication of these risks is only illustrative.
Assurance level: Reasonable assurance = high level, not absolute assurance; Cite inherent limitations: nature of financial reporting, nature of audit procedures, and the need to audit within a reasonable period and at reasonable cost.

How to solve SA 200 and Basic Principles Governing an Audit questions

Most SA 200 questions are either theory (state objectives or explain principles) or case-based (identify which principle was breached). Use this method for both.

1Read the question and mark the keyword: objectives, skepticism, judgment, evidence, reasonable assurance or ethics.
2State the relevant SA 200 requirement in one or two lines, using standard terms.
3Define the term in plain words, for example skepticism means a questioning mind and critical assessment of evidence.
4For case questions, pick out the facts that show compliance or breach, such as accepting management explanations without corroboration.
5Link facts to the principle and give a conclusion: what the auditor should have done.
6Add the limitation or qualifier that earns marks, such as reasonable not absolute assurance, or sufficiency versus appropriateness.
7Close with a one-line conclusion that answers the question asked.

Quickest way: Keyword-to-principle mapping

When to use it: Use it for MCQs and for the opening lines of written answers when time is short.

MCQ: eliminate any option that says absolute or guarantee, since an audit gives reasonable assurance only.
MCQ: if the option mixes up quantity and quality, remember sufficiency is quantity and appropriateness is relevance plus reliability.
MCQ: skepticism is attitude; judgment is application of knowledge and experience. Match the word to the scenario.
Written: use a fixed layout of provision, facts, conclusion. State the SA 200 point first, then apply it.
Written: always list both overall objectives and name at least three of the supporting principles to secure step marks.

Common mistakes in SA 200 and Basic Principles Governing an Audit

Saying the auditor gives absolute assurance that statements are correct.
Students equate an audit opinion with a certificate of accuracy.
Fix: Write reasonable assurance, a high but not absolute level, and mention inherent limitations.
Treating sufficient and appropriate as the same thing.
Both words sound like quality.
Fix: Sufficiency measures quantity. Appropriateness measures quality through relevance and reliability.
Using skepticism and judgment interchangeably.
Both describe the auditor's mindset.
Fix: Skepticism is a questioning attitude toward evidence. Judgment is applying knowledge and experience to decisions such as materiality and procedures.
Listing only the first objective of the auditor.
The first objective is most quoted.
Fix: Add the second: report on the financial statements and communicate as the SAs require.
Believing more evidence can make up for unreliable evidence.
Students think volume solves quality problems.
Fix: State that the quantity needed depends on risk of misstatement and on evidence quality, but poor quality evidence is not fixed by more of it.
Ignoring ethics and independence in the answer.
They focus on procedures, not the Code of Ethics.
Fix: Include that the auditor must comply with relevant ethical requirements, including independence, as part of conducting the audit.

Worked examples

Example 1

State the overall objectives of the auditor under SA 200 and explain why an audit gives only reasonable assurance.

Show the solution

Objective 1: obtain reasonable assurance whether the financial statements as a whole are free from material misstatement, due to fraud or error, so the auditor can express an opinion on whether they are prepared, in all material respects, in accordance with the applicable financial reporting framework (or, for a fair presentation framework, give a true and fair view).
Objective 2: report on the financial statements and communicate as required by the SAs, in line with the auditor's findings.
Reasonable assurance means a high level of assurance, but not absolute.
Reasons: inherent limitations arise from the nature of financial reporting (which involves judgment and estimates), the nature of audit procedures (such as testing and the fact that most evidence is persuasive rather than conclusive), and the need to complete the audit within a reasonable period and at a reasonable cost.
Conclusion: an audit lowers the risk of undetected material misstatement to an acceptable level but cannot eliminate it.

Answer: The two objectives are reasonable assurance leading to an opinion, and reporting and communication per the SAs. Assurance is reasonable, not absolute, because of the nature of financial reporting, the nature of audit procedures, and the need to audit within a reasonable time and cost.

Example 2

While auditing a company, the auditor accepts the finance manager's verbal statement that a large debtor balance is recoverable, and does not ask for confirmation or subsequent receipts. Comment with reference to SA 200.

Show the solution

Provision: SA 200 requires the auditor to plan and perform the audit with professional skepticism, recognising that circumstances may exist that cause the financial statements to be materially misstated.
SA 200 also requires sufficient appropriate audit evidence. Verbal management statements alone are generally less reliable than external or documentary evidence.
Facts: the balance is large, so material. The auditor relied on an internal verbal explanation and did no corroboration.
Conclusion: the auditor failed to apply skepticism and did not obtain sufficient appropriate evidence.
Action: send balance confirmation, check subsequent receipts, review ageing and credit terms, and assess the need for a provision. Use judgment on the extent of work given the materiality.

Answer: The auditor has not exercised professional skepticism and has not obtained sufficient appropriate evidence. Corroboration through confirmation, subsequent receipts and ageing review is required before concluding on recoverability.

Exam tips

Learn the two overall objectives word for word. Short-answer questions often ask for exactly these.
In case studies, name the principle breached before explaining it. Examiners reward the right label plus application.
For MCQs, distrust options with words like absolute, guarantee or certify.
Distinguish clearly between sufficiency, appropriateness, relevance and reliability when evidence questions appear.
Pair SA 200 with the Code of Ethics for questions on independence and integrity.

Practice questions from Nature, Objective and Scope of Audit

SA 200 and Basic Principles Governing an Audit in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

SA 200 and Basic Principles Governing an Audit: frequently asked questions

What are the overall objectives of the auditor under SA 200?

There are two. The auditor obtains reasonable assurance that the financial statements as a whole are free from material misstatement, to opine on framework compliance or on a true and fair view. The auditor also reports on the statements and communicates as the SAs require.

What is the difference between professional skepticism and professional judgment?

Skepticism is an attitude: a questioning mind and critical assessment of evidence. Judgment is the application of training, knowledge and experience to decisions such as materiality, risk responses and evidence evaluation.

What does sufficient appropriate audit evidence mean?

Sufficiency is the quantity of evidence. Appropriateness is its quality, covering relevance and reliability. Both are needed to support the opinion and bring audit risk to an acceptably low level.

Why is an audit not a guarantee of accuracy?

Because of inherent limitations: the nature of financial reporting, the nature of audit procedures, and the need to complete the audit within a reasonable time and at a reasonable cost. The auditor gives reasonable, not absolute, assurance.