IFRS 18 Presentation and Disclosure in Financial Statements: What Finance Teams Need to Know

IFRS 18 Presentation and Disclosure in Financial Statements is the new accounting standard set to replace IAS 1, reshaping how companies present their financial performance to investors and other users. It's one of the most significant changes to financial reporting in years, with a particular focus on the structure of the income statement. This practical guide explains what IFRS 18 is, its main changes, when it takes effect, and why it matters — in clear, plain language. It's an important emerging topic for ACCA and finance professionals, building on the foundation of IAS 1. (Always check the standard and your jurisdiction for the current effective date and requirements.)

What is IFRS 18?

IFRS 18 is the standard on Presentation and Disclosure in Financial Statements, issued to replace IAS 1. While it carries over many of IAS 1's underlying principles, it introduces important new requirements aimed at improving the comparability and transparency of how companies report their financial performance — responding to long-standing concerns that the income statement lacked structure and that companies' own "adjusted" performance measures were inconsistent and hard to compare.

The three main areas of change

IFRS 18 focuses on three key areas:

• A defined structure for the statement of profit or loss. IFRS 18 introduces required categories — broadly operating, investing and financing — and mandates new defined subtotals, notably operating profit and profit before financing and income taxes. This brings consistency to a statement that previously allowed considerable variation, making companies' results more comparable.
• Management-defined performance measures (MPMs). Where companies use their own "non-GAAP" or alternative performance measures (such as "adjusted operating profit"), IFRS 18 requires them to be disclosed in the notes, with a reconciliation to the most comparable IFRS subtotal and an explanation. This brings discipline and transparency to measures that were previously presented inconsistently.
• Enhanced principles on aggregation and disaggregation. IFRS 18 provides clearer principles on how information should be grouped and broken down — based on shared characteristics — to ensure useful, not obscured, information in the primary statements and notes.

When does IFRS 18 take effect?

IFRS 18 is effective for annual reporting periods beginning on or after 1 January 2027, with earlier application permitted. Because it changes the face of the income statement and key disclosures, companies need lead time to prepare — updating systems, processes and the way they communicate performance. As always, the precise timing and any local adoption details should be checked against the standard and the relevant jurisdiction.

How IFRS 18 differs from IAS 1

The key shift is structure and transparency. IAS 1 set out what the financial statements contain and the broad principles, but left the income statement relatively unstructured and said little about companies' own performance measures. IFRS 18 keeps the foundations but adds a defined income-statement structure with required subtotals, brings management-defined performance measures into the audited notes, and sharpens the rules on aggregation. The statement of financial position, cash flows and the underlying recognition and measurement rules in other standards are largely unaffected — IFRS 18 is about presentation and disclosure, not how items are measured.

Why IFRS 18 matters

IFRS 18 matters because performance reporting is what investors and analysts scrutinise most, and the lack of structure and consistency in the income statement — and in companies' adjusted measures — had been a persistent frustration. By standardising key subtotals and bringing alternative performance measures into the open, IFRS 18 aims to make companies' performance genuinely more comparable and transparent. For accountants, it's a major change to prepare for, and an increasingly important topic in professional study.

Frequently asked questions

What is IFRS 18?

The new standard on Presentation and Disclosure in Financial Statements, replacing IAS 1, focused on improving the comparability and transparency of how companies present financial performance.

What are the main changes?

A defined structure for the income statement with required subtotals (operating profit; profit before financing and income taxes), disclosure of management-defined performance measures in the notes, and enhanced aggregation principles.

When does IFRS 18 take effect?

For annual reporting periods beginning on or after 1 January 2027, with earlier application permitted. Check the standard and your jurisdiction for confirmation of the date and any local adoption details.

How is IFRS 18 different from IAS 1?

It keeps IAS 1's foundations but adds a defined income-statement structure and subtotals, brings alternative performance measures into the notes, and sharpens aggregation rules. It changes presentation and disclosure, not how items are measured.

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