Audit and Assurance · The Independent Auditor's Report

Unmodified and Modified Audit Opinions (ISA 705)

Updated 11 October 2026 · Fact-checked

An unmodified opinion says the financial statements give a true and fair view. The auditor modifies the opinion when there is a material misstatement or when evidence cannot be obtained. Decide the type by asking whether the issue is material or pervasive, and whether it is a disagreement or a limitation.

Understand Unmodified and Modified Audit Opinions

The auditor's opinion answers one question: do the financial statements give a true and fair view (or present fairly, in all material respects) in line with the applicable financial reporting framework? If yes, the auditor gives an unmodified opinion. This is the clean opinion.

If not, the opinion is modified. ISA 705 sets out three types: qualified, adverse and disclaimer of opinion. There are only two reasons to modify. Either the financial statements are materially misstated, or the auditor is unable to obtain sufficient appropriate audit evidence. The first is a disagreement. The second is a limitation on scope.

Two terms drive the choice. Material means the issue could influence the decisions users make. Pervasive means the effects are not confined to specific items, or if confined they represent a substantial proportion of the financial statements, or they relate to disclosures that are fundamental to users' understanding. Pervasive is a step beyond material.

So you have a simple grid. Material but not pervasive: qualified (except for). Material and pervasive misstatement: adverse. Material but not pervasive inability to get evidence: qualified. Material and pervasive inability to get evidence: disclaimer.

A qualified opinion says the statements are fair except for the effect of the matter. An adverse opinion says they are not fair. A disclaimer says the auditor cannot form an opinion at all. Modified reports also need a Basis for Opinion section that explains the reason and, where possible, quantifies the effect. The opinion paragraph is headed Qualified Opinion, Adverse Opinion or Disclaimer of Opinion.

Key rules to remember

Unmodified opinion: No material misstatement + sufficient appropriate evidence obtained = unmodified; Wording is that the statements give a true and fair view (or present fairly, in all material respects).
Material misstatement, not pervasive: Material, not pervasive → Qualified opinion ('except for'); The rest of the statements are fairly stated.
Material misstatement, pervasive: Material and pervasive → Adverse opinion; Statements as a whole do not give a true and fair view.
Inability to obtain evidence, not pervasive: Possible effects material, not pervasive → Qualified opinion ('except for possible adjustments'); Evidence limit, so the wording refers to possible effects.
Inability to obtain evidence, pervasive: Possible effects material and pervasive → Disclaimer of opinion; The auditor does not express an opinion.
Pervasive effects: Pervasive = not confined to specific items, or a substantial proportion of the statements, or fundamental to users' understanding of disclosures; Use these three tests in your answer.
Report layout when modified: Opinion section (headed by type) → Basis for Opinion section giving the reasons; For a disclaimer, the opinion section states that the auditor does not express an opinion.

How to solve Unmodified and Modified Audit Opinions questions

Use the same sequence for any scenario that asks for the audit opinion or the effect on the report.

1Identify the issue and decide whether it is a disagreement (a misstatement, or inadequate disclosure) or a limitation (cannot get evidence).
2Check that you have the facts to judge the size. Compare the amount with materiality, using overall figures such as profit before tax, revenue or total assets.
3Say whether it is material. If it is below materiality, no modification is needed. State this clearly.
4If material, test for pervasiveness: is it confined to specific items, a substantial proportion of the statements, or a fundamental disclosure?
5Pick the opinion using the grid: disagreement not pervasive is qualified, disagreement pervasive is adverse, limitation not pervasive is qualified, limitation pervasive is disclaimer.
6Write the wording: the section heading, the 'except for' phrase if qualified, and the Basis for Opinion paragraph with the reason and quantified effect.
7Check whether other reporting is needed, such as a material uncertainty over going concern or key audit matters, and say these are separate from the opinion.

Quickest way: Two-question opinion grid

When to use it: Use in Section A and B objective questions where you must choose the opinion type in under two minutes.

Question 1: Is the problem a wrong number or disclosure (disagreement) or missing evidence (limitation)?
Question 2: Is it material only, or material and pervasive?
Disagreement plus material = qualified. Disagreement plus pervasive = adverse.
Limitation plus material = qualified. Limitation plus pervasive = disclaimer.
If the amount is below materiality, answer unmodified. Check this first when numbers are given.

Common mistakes in Unmodified and Modified Audit Opinions

Giving an adverse opinion for a pervasive limitation, or a disclaimer for a pervasive misstatement.
Students remember 'pervasive' but not which problem type goes with which opinion.
Fix: Link them: misstatement leads to adverse, lack of evidence leads to disclaimer. Always name the problem type first.
Treating any large number as pervasive.
Students confuse size with spread. A big but isolated item is material, not necessarily pervasive.
Fix: Apply the three pervasiveness tests. An item can be very material yet confined to one balance, giving a qualified opinion.
Modifying the opinion for an immaterial issue.
Students see an error and assume it must be reported in the opinion.
Fix: Compare it with materiality first. Immaterial items leave the opinion unmodified.
Using 'except for' wording for a disclaimer, or giving a disclaimer when only one area is unaudited and the rest is fine.
Students mix up the wordings of the three opinions.
Fix: Qualified is 'except for'. Adverse is 'do not give a true and fair view'. Disclaimer is 'we do not express an opinion'.
Confusing a modified opinion with an emphasis of matter paragraph or a going concern uncertainty paragraph.
All of them appear in the auditor's report and involve problems with the statements.
Fix: Modification changes the opinion because of a material misstatement or limitation. Emphasis of matter and material uncertainty paragraphs do not change an unmodified opinion when the matter is properly disclosed.
Forgetting to explain the effect in the Basis for Opinion section.
Students stop once they name the opinion.
Fix: In written answers, state the reason, the amount where known, and which items are affected.

Worked examples

Example 1

Section C style: Fenwick Co has profit before tax of $4m and total assets of $30m. Materiality is set at $200,000. Inventory includes obsolete items of $1.5m that management refuses to write down. All other balances are fairly stated. Advise on the audit opinion.

Show the solution

The issue is a disagreement: inventory is overstated by $1.5m because of unwritten-down obsolete items.
Compare with materiality: $1.5m is far above $200,000, so it is material. It is also 37.5% of profit before tax ($1.5m ÷ $4m).
Test pervasiveness: the error is confined to one balance, inventory. It is 5% of total assets ($1.5m ÷ $30m), which is not a substantial proportion. It is not a fundamental disclosure issue. So it is not pervasive.
Material but not pervasive misstatement gives a qualified opinion.
Wording: the opinion section is headed Qualified Opinion and says that, except for the effect of the matter in the Basis for Opinion section, the statements give a true and fair view. The Basis for Opinion section explains the overstatement of inventory by $1.5m and its effect on profit and assets.

Answer: Qualified opinion ('except for') because the material misstatement of $1.5m is confined to inventory and is not pervasive.

Example 2

Section B style: Audit of Larch Co. The auditor was not allowed to attend the year-end inventory count and cannot perform alternative procedures. Inventory is 70% of total assets and the possible effect on profit is material. Management also did not keep reliable accounting records for other areas. Which opinion should the auditor give, and why?

Show the solution

The issue is a limitation: the auditor cannot obtain sufficient appropriate evidence, so this is not a misstatement.
Possible effects are material: inventory is 70% of total assets, and profit could be materially affected.
Test pervasiveness: inventory is a substantial proportion of the statements, and records are also unreliable in other areas. The possible effects are therefore pervasive.
Material and pervasive limitation gives a disclaimer of opinion.
Wording: the opinion section is headed Disclaimer of Opinion and states that the auditor does not express an opinion. The Basis for Opinion section explains that evidence could not be obtained.

Answer: Disclaimer of opinion, because the inability to obtain evidence has possible effects that are both material and pervasive.

Exam tips

Always classify first: disagreement or limitation. Many wrong answers come from skipping this step.
In calculation-based scenarios, compute the item as a percentage of profit and total assets. Then compare with the materiality given before choosing the opinion.
In written answers, use the words 'material' and 'pervasive' explicitly and give a one-line reason for each. Markers look for these words.
Learn the exact wording differences: 'except for' for qualified, 'do not give a true and fair view' for adverse, and 'do not express an opinion' for disclaimer.
Objective test questions are all or nothing, so read all four options before picking, especially where qualified and disclaimer both look plausible.

Unmodified and Modified Audit Opinions in other exams

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

Unmodified and Modified Audit Opinions: frequently asked questions

What is the difference between a qualified and an adverse opinion?

Both arise from a material misstatement. A qualified opinion applies when the misstatement is material but not pervasive, so the rest of the statements are fair. An adverse opinion applies when it is both material and pervasive, so the statements as a whole are not fair.

What is the difference between a disclaimer of opinion and an adverse opinion?

An adverse opinion is given when the auditor has the evidence and concludes the statements are materially and pervasively misstated. A disclaimer is given when the auditor cannot obtain sufficient appropriate evidence and the possible effects are material and pervasive. In a disclaimer, the auditor does not express any opinion.

What do material and pervasive mean in an audit report?

Material means the matter could influence users' economic decisions. Pervasive means the effects are not confined to specific items, or they form a substantial proportion of the statements, or they affect disclosures fundamental to users' understanding. Pervasive goes beyond material.

Does a going concern paragraph mean the opinion is modified?

Not by itself. If the auditor concludes a material uncertainty exists and it is adequately disclosed, the opinion stays unmodified and the report includes a separate section on material uncertainty related to going concern. The opinion is modified if the disclosure is inadequate.