IFRS 8 Operating Segments: Thresholds, Aggregation and the Management Approach (2026)

A company with several distinct businesses under one roof doesn't report them as a single undifferentiated number — IFRS 8 requires disclosure by operating segment, so a reader can see which parts of the business are actually driving revenue, profit, and risk. It's one of the standards every group with more than one identifiable business line has to apply, and it trips people up less because it's conceptually hard and more because the rules are mechanical and easy to misapply under time pressure.

What Counts as an Operating Segment

IFRS 8 defines an operating segment as a component of an entity that engages in business activities from which it earns revenue and incurs expenses, whose operating results are regularly reviewed by the entity's chief operating decision maker (the "CODM") to assess performance and allocate resources, and for which discrete financial information is available. The CODM isn't necessarily one named individual — it's whichever function actually makes resource-allocation decisions, which in practice is usually the CEO or an executive committee, but the test is functional, not job-title-based.

The Management Approach — Why Segment Numbers Don't Always Tie to the Financial Statements

IFRS 8 takes what's called a management approach: segment information is reported the way management actually sees it internally, using whatever measures the CODM uses to evaluate performance, even if those measures differ from the recognition and measurement principles used elsewhere in the financial statements. This is a deliberate design choice — the standard would rather show readers the business the way management runs it than force a separate segment-specific accounting framework. It's also why segment profit figures sometimes don't reconcile neatly to the income statement without a reconciliation note, which IFRS 8 requires precisely because of this gap.

The Quantitative Thresholds: When a Segment Has to Be Reported Separately

An operating segment becomes a reportable segment — meaning it gets its own disclosure — if it meets any one of three 10% thresholds: its revenue (internal and external combined) is at least 10% of the combined revenue of all operating segments; the absolute amount of its reported profit or loss is at least 10% of the greater of the combined profit of all profitable segments or the combined loss of all loss-making segments; or its assets are at least 10% of the combined assets of all operating segments. Meeting any one of the three is enough — a segment doesn't need to clear all three tests.

The 75% External Revenue Test

There's a second check that catches cases where the 10% thresholds alone would leave too much of the business unreported. If the reportable segments identified by the 10% tests together account for less than 75% of the entity's total external revenue, additional segments have to be added as reportable — even ones that didn't individually clear a 10% threshold — until the combined reportable segments reach that 75% mark.

Combining Segments: The Aggregation Criteria

Not every operating segment has to stand alone in the disclosure. Two or more operating segments can be aggregated into one reportable segment if they have similar economic characteristics and are similar across the nature of their products and services, the nature of their production processes, the type of customer they serve, the distribution methods used, and the regulatory environment they operate in. This is a judgement call companies sometimes lean on to keep disclosure simpler — which is exactly why auditors and exam markers alike tend to scrutinise it closely when a set of segments looks aggregated for convenience rather than genuine similarity.

Where This Fits Alongside the Rest of Group Reporting

Segment reporting sits downstream of how the group itself is defined and consolidated. Our guides to IFRS 10 consolidated financial statements and IFRS 3 business combinations cover how a group and its components get recognised in the first place; IFRS 8 is the standard that then determines how those components get disclosed once the group financial statements are being prepared. For anyone working toward ACCA Strategic Business Reporting, where segment reporting appears regularly, our guide to passing ACCA SBR covers the wider standards this sits alongside. And where AI tools are starting to touch this kind of standards-application work more generally, our guide to AI and IFRS covers where that help stops and the judgement calls still sit with the preparer.

FAQ

Does every company have to report operating segments?
Only entities whose debt or equity instruments are publicly traded, or that are in the process of issuing them, are required to apply IFRS 8 — though many other groups disclose segment information voluntarily because it's useful to readers.

What happens if a segment doesn't meet any of the 10% thresholds?
It doesn't have to be reported separately, but its results still get included in an "all other segments" category, disclosed separately from the reportable segments, and management can also choose to report a segment that doesn't meet the thresholds if they believe the information is useful.

Why don't segment profit figures always match the income statement?
Because IFRS 8 uses the management approach — segment figures reflect whatever measures the CODM actually uses internally, which can differ from the recognition and measurement principles used in the primary financial statements. IFRS 8 requires a reconciliation note precisely to bridge that gap.

IFRS 8 is one of the shorter standards, but the thresholds and the aggregation judgement are exactly the kind of mechanical detail that's easy to get right in theory and wrong under exam or reporting-deadline pressure — worth revisiting on its own rather than as a footnote to consolidation.