ISA 705 (Revised) — Modifications to the Opinion in the Auditor's Report: Complete Guide

Key Takeaways

ISA 705 (Revised) establishes three types of modified opinions: qualified opinion, adverse opinion, and disclaimer of opinion. The type depends on the nature of the matter and the pervasiveness of its effects.
A qualified opinion ("except for") is used when the effects are material but not pervasive — whether caused by a misstatement or a scope limitation.
An adverse opinion is used when misstatements are both material and pervasive — the financial statements do not present fairly as a whole.
A disclaimer of opinion is used when the auditor is unable to obtain sufficient appropriate evidence and the possible effects are both material and pervasive.
"Pervasive" means the effects: (a) are not confined to specific elements, (b) if confined, represent a substantial proportion, or (c) relate to disclosures fundamental to users' understanding.
The modification is reported through a renamed Opinion section and a corresponding "Basis for..." section describing the matter.
When a disclaimer is issued, no Key Audit Matters are communicated and certain auditor responsibility descriptions are removed.

What is ISA 705 (Revised)?

ISA 705 (Revised), titled "Modifications to the Opinion in the Independent Auditor's Report," addresses the situations where the auditor cannot express an unmodified (clean) opinion under ISA 700. It establishes when modification is required and what type of modification is appropriate — a critical judgment that directly affects how users interpret the financial statements.

Modified opinions are relatively rare in practice (particularly adverse opinions and disclaimers), but understanding them is essential: they signal that something is materially wrong with the financial statements or that the auditor could not complete the work needed to form a conclusion.

The Decision Matrix

The type of modified opinion depends on two dimensions:

	Material but not pervasive	Material and pervasive
Financial statements are materially misstated	Qualified opinion ("except for")	Adverse opinion
Unable to obtain sufficient appropriate evidence	Qualified opinion ("except for the possible effects of...")	Disclaimer of opinion

Understanding "pervasive"

ISA 705.5(a) defines pervasive as effects that, in the auditor's judgment:

Are not confined to specific elements, accounts, or items of the financial statements.
If confined, represent or could represent a substantial proportion of the financial statements.
In relation to disclosures, are fundamental to users' understanding of the financial statements.

The pervasiveness judgment is critical — it determines whether the matter results in a "carve-out" (qualified) or a wholesale conclusion that the financial statements cannot be relied upon (adverse/disclaimer).

The Three Modified Opinions

Qualified opinion

When: The auditor concludes that misstatements are material but not pervasive, or that the auditor was unable to obtain sufficient evidence and the possible effects are material but not pervasive.

Wording (misstatement): "In our opinion, except for the effects of the matter described in the Basis for Qualified Opinion section, the financial statements present fairly..."

Wording (scope limitation): "In our opinion, except for the possible effects of the matter described in the Basis for Qualified Opinion section, the financial statements present fairly..."

Note the distinction: for misstatements, the auditor knows the effects; for scope limitations, the auditor refers to possible effects.

Adverse opinion

When: The auditor concludes that misstatements, individually or in aggregate, are both material and pervasive to the financial statements.

Wording: "In our opinion, because of the significance of the matter described in the Basis for Adverse Opinion section, the financial statements do not present fairly..."

Disclaimer of opinion

When: The auditor is unable to obtain sufficient appropriate audit evidence on which to base the opinion, and the possible effects are both material and pervasive.

Wording: "We do not express an opinion on the financial statements... Because of the significance of the matter(s) described in the Basis for Disclaimer of Opinion section, we have not been able to obtain sufficient appropriate audit evidence to provide a basis for an audit opinion."

The scope limitation distinction matters

Not all scope limitations are created equal. A management-imposed limitation (management refuses access to records or refuses to allow the auditor to perform procedures) triggers a stronger response than a circumstance-imposed limitation (e.g., records destroyed in a fire). If management imposes the limitation, the auditor must first request that management remove it. If management refuses, the auditor must communicate with those charged with governance and consider whether alternative procedures can provide sufficient evidence. If not, and it is possible to withdraw, the auditor should consider doing so — particularly if the limitation suggests management may be concealing information (ISA 240 implications).

Effects on the Auditor's Report Structure

Basis for Opinion section

When the opinion is modified, the "Basis for Opinion" section becomes "Basis for Qualified Opinion," "Basis for Adverse Opinion," or "Basis for Disclaimer of Opinion." This section must describe the matter(s) giving rise to the modification, and — for misstatements — quantify the financial effects unless impracticable.

Key Audit Matters

For qualified and adverse opinions, the auditor may still communicate other KAM. The matter causing the modification is not repeated as a KAM — the "Basis for..." section serves that purpose.

For a disclaimer of opinion, KAM are not communicated (unless required by law or regulation). Communicating KAM alongside a disclaimer could suggest the audit provided more assurance than it did.

Auditor's responsibilities

For a disclaimer, the standard descriptions of the auditor's responsibilities are modified: the report does not include the standard statements about obtaining reasonable assurance, the discussion of materiality, or the statement about evaluating overall presentation. This is because the auditor was unable to complete the audit — these descriptions would be misleading.

Common Scenarios in Practice

Inventory not observed. If the auditor was appointed after the year-end count and cannot obtain sufficient evidence through alternative procedures — qualified opinion (if inventory is material but not pervasive to the financial statements).

Investment not verifiable. If the auditor cannot verify a significant investment and alternative procedures are insufficient — qualified or disclaimer depending on pervasiveness.

Departure from the framework. If the entity has not consolidated a subsidiary that should be consolidated under IFRS 10 — qualified or adverse depending on pervasiveness.

Going concern. If the entity should be on a break-up basis but is not — adverse opinion. If management refuses to make or extend its going concern assessment — qualified opinion or disclaimer.

Multiple uncertainties. In extremely rare cases involving multiple material uncertainties, a disclaimer may be appropriate even when the auditor has obtained evidence about each individual uncertainty, because the cumulative effect prevents forming an overall opinion.

ISA 705 (Revised) in Your Jurisdiction

Netherlands. COS 705 follows ISA 705 (Revised). Modified opinions are relatively uncommon in Dutch statutory audits, but the AFM has emphasised that auditors must not hesitate to modify when the conditions are met. The AFM has criticised instances where auditors issued unmodified opinions despite unresolved disagreements with management on accounting treatments.

Germany. IDW PS 405 adapts ISA 705 (Revised). German practice includes the Versagungsvermerk (denial of opinion/disclaimer), the eingeschränkte Bestätigung (qualified opinion), and the Versagung wegen Einwendungen (adverse opinion). The consequences of a modified opinion under German law can be significant.

United Kingdom. ISA (UK) 705 is substantively aligned with ISA 705 (Revised). The FRC has emphasised the importance of clear, entity-specific Basis for Opinion descriptions — particularly around quantification of misstatement effects.

France. NEP 705 implements ISA 705 (Revised). French modified opinions include certification avec réserve(s) (qualified), refus de certifier pour désaccord (adverse), and refus de certifier pour limitation (disclaimer). French company law attaches specific legal consequences to modified opinions.

Frequently Asked Questions

Can the auditor modify the opinion for a disclosure deficiency?

Yes. Inadequate or missing disclosures are misstatements under ISA 450. If a required disclosure is omitted or is materially misleading, and the effect is material, the auditor must modify the opinion.

Can a qualified opinion and an Emphasis of Matter paragraph appear in the same report?

Yes. A qualified opinion addresses a specific matter that modifies the opinion; an Emphasis of Matter paragraph draws attention to a different matter that does not modify the opinion. They are not mutually exclusive.

What if the auditor discovers multiple issues — some leading to qualified, some to adverse?

The auditor must consider the cumulative effect. If the combined effects of all matters are pervasive, an adverse opinion is appropriate even if individual matters would each have led to only a qualified opinion. An adverse opinion cannot be "partial" — it applies to the financial statements as a whole.

Must the auditor quantify the financial effects?

For misstatements: yes, unless impracticable. For scope limitations: the auditor describes the possible effects (not actual effects, since they are unknown). Regulators expect quantification wherever reasonably possible.