SIA 110 applies to assurance assignments, meaning assignments where the internal auditor issues a formal opinion. It separates that kind of work from routine reporting of observations, sets out what an assurance assignment is made of, and lays down the minimum that must be in place before an audit opinion can be issued.
This page covers SIA 110 as it stands in ICAI’s October 2022 compendium. ICAI’s February 2026 compendium, applicable from 1 April 2026, renumbers the standards, so check the current number and text in that compendium before citing it in a report.
The file checklist and the mistakes above are practice points drawn from the requirements of the standard. They are not text from the standard.
The IIA's Global Internal Audit Standards (effective 9 January 2025) are a separate set from a different body, and there is no paragraph-for-paragraph match. On this subject, the IIA describes internal auditing as providing the board and management with independent, risk-based and objective assurance, advice, insight and foresight.
This standard is described here as it stands in the October 2022 compendium, which is the earlier set. ICAI's Internal Audit Standards Board lists its Compendium of Standards on Internal Audit (as on February 2026) as applicable from 1 April 2026 (source: the Board's compendium page, checked on 1 October 2026). That compendium renumbers the standards, so check the current number and text there before citing this standard in a report. ICAI's compendium page does not say whether the standards are mandatory or recommendatory, so we do not describe any standard as mandatory. The effective-date clause in each 2019 standard said it applied to internal audits beginning on or after a date to be notified by the Council of ICAI.
These pages summarise each standard as it stands in ICAI's Compendium of Standards on Internal Audit (as on 1 October 2022), working from an extract of that document. They are summaries and close paraphrases, not the text of the standards. ICAI's Internal Audit Standards Board lists its Compendium of Standards on Internal Audit (as on February 2026) as applicable from 1 April 2026 (source: the Board's compendium page, checked on 1 October 2026). For that current set we have only the titles, taken from the Board's 2025-26 annual report; its text is available from ICAI through a registration form on the compendium page and is not summarised here. ICAI's compendium page does not say whether the standards are mandatory or recommendatory, so we do not describe any standard as mandatory. Before you cite a number, a paragraph or a status in a report, check the February 2026 compendium. internalaudit.icai.org
Editable formats and tools from CORAA’s internal audit library that put SIA 110 into practice. Free to use.
SIA 110, Nature of Assurance, is a Standard on Internal Audit issued by the Internal Audit Standards Board of ICAI. SIA 110 applies to assurance assignments, meaning assignments where the internal auditor issues a formal opinion. It separates that kind of work from routine reporting of observations, sets out what an assurance assignment is made of, and lays down the minimum that must be in place before an audit opinion can be issued.
ICAI's compendium page does not say whether the Standards on Internal Audit are mandatory or recommendatory, so we do not describe SIA 110 as mandatory. ICAI's Internal Audit Standards Board lists its Compendium of Standards on Internal Audit (as on February 2026) as applicable from 1 April 2026 (source: the Board's compendium page, checked on 1 October 2026). SIA 110 as described on this page is from the earlier October 2022 compendium. The February 2026 compendium renumbers the standards, so check the current number and text there before citing it in a report.
A planning note recording whether an opinion will be issued and, if so, the nature of assurance agreed. The criteria the subject matter is being measured against. Evidence that supports the opinion (SIA 320) in working papers that can stand on their own (SIA 330).
The number is the same but the title is not. In ICAI's February 2026 compendium, which ICAI lists as applicable from 1 April 2026, SIA 110 is titled "Basic Principles of Internal Audit". This page covers SIA 110 as it stands in the October 2022 compendium, titled "Nature of Assurance". Only the titles of the February 2026 set are listed here; check its text in that compendium before citing it.
