IFRS 18: What UK CFOs Must Restructure Before January 2027
UK CFOs must restructure their income statements, overhaul ERP chart-of-accounts configurations, and redesign how they disclose performance measures — all before 1 January 2027.
IFRS 18 Presentation and Disclosure in Financial Statements replaces IAS 1 for reporting periods beginning on or after 1 January 2027. The UK Endorsement Board formally adopted the standard on 10 December 2025, making it applicable to all UK-listed companies and IFRS reporters. The critical, often misunderstood obligation: because IFRS 18 must be applied retrospectively, 2026 comparative figures must be prepared under the new standard. For calendar-year-end companies, that means 2026 is effectively the first year of IFRS 18 — even though the mandatory effective date is 2027. CFOs who are not already in implementation will have a compliance problem in 12 months.
Why Is IFRS 18 More Disruptive Than UK CFOs Realise?
IFRS 18 represents the most fundamental redesign of income statement presentation since the introduction of IAS 1 in 1997. It does not simply rename existing line items — it introduces three entirely new defined categories of income and expense: operating, investing, and financing. Every item currently sitting in a company’s profit and loss account must be reclassified into one of these categories, and two new mandatory subtotals must appear in every income statement: operating profit and profit before financing and income taxes.
According to ICAEW, the standard introduces a significant new discipline around management-defined performance measures (MPMs) — measures like “adjusted EBITDA” or “underlying operating profit” that companies currently disclose with wide variation in methodology and positioning. Under IFRS 18, all MPMs must be disclosed in a single, audited note to the financial statements, with a reconciliation to the nearest IFRS-defined line item. This brings non-GAAP measures, for the first time, under formal audit scrutiny. The BDO analysis published in early 2026 describes this as “a fundamental redesign of financial statement presentation” — not an incremental update.
- Executive Action: Commission an immediate impact assessment — identify every income and expense line in your current P&L and classify it into IFRS 18’s operating, investing, or financing categories.
- Map all management-defined performance measures currently disclosed in investor communications, results presentations, and annual reports — these will require audited reconciliation notes from 2027.
- Brief the Audit Committee now: IFRS 18 changes what the auditor must review and will affect audit scope and potentially fee negotiations.
What ERP and Systems Changes Do UK CFOs Need Before Year-End?
IFRS 18 is not merely a presentation exercise — it requires changes deep in a company’s financial systems architecture. The chart of accounts must be restructured to capture the three IFRS 18 category tags (operating, investing, financing) at transaction level. ERP systems — whether SAP, Oracle, Microsoft Dynamics, or others — must be configured to code income and expense items to the correct category from 1 January 2026, to ensure that 2026 comparatives are captured accurately throughout the year rather than requiring a manual reclassification exercise in December 2026.
The Houseblend CFO implementation guide identifies ERP configuration as the longest lead-time item in the entire IFRS 18 implementation roadmap — typically requiring four to six months from scoping to testing. CFOs who have not yet initiated an ERP impact assessment risk running out of time to complete system changes before 2026 comparative data begins accumulating. Finance transformation resources are also in high demand: firms that delay into Q3 2026 may find that the specialist ERP finance implementation capacity they need has been absorbed by earlier movers. Review INFORMD’s financial governance templates to structure your IFRS 18 implementation programme.
- Executive Action: Initiate an ERP chart-of-accounts restructuring project immediately — the four-to-six month implementation window means July 2026 is effectively the last safe start date for calendar-year-end companies.
- Engage your external auditors now on their IFRS 18 readiness — understand their approach to auditing the new MPM disclosure note before your 2026 interim results.
- Establish an IFRS 18 steering group with representation from Finance, IT, Legal, and Investor Relations — the investor communication implications are as significant as the accounting changes.
How Should CFOs Manage the Investor Relations Implications?
IFRS 18 will change the numbers analysts and investors have been tracking. When operating profit is restated using the new IFRS 18 definition — which may differ materially from how operating profit has previously been presented — financial models, covenant calculations, and peer comparisons built on historical data will require revision. CFOs must proactively manage this transition with their investor relations teams, ensuring that sell-side analysts receive early guidance on how restated 2025 and 2026 comparatives will differ from previously reported figures.
The audited MPM disclosure requirement is particularly sensitive. For companies that have historically presented “adjusted EBITDA” or “adjusted operating profit” as their headline performance metric, the requirement to provide a formal, audited reconciliation to an IFRS-defined line item will be a significant change in analyst scrutiny. Some companies may choose to discontinue certain MPMs rather than subject them to audit. The decision about which MPMs to retain, disclose, and reconcile should be made by Q3 2026 — in advance of any preliminary results presentations that reference 2026 full-year performance expectations. Explore INFORMD’s executive briefing library for further analysis on IFRS 18 investor communication strategies.
- Executive Action: Prepare a restated 2025 income statement under IFRS 18 categorisation by Q3 2026 — share it with sell-side analysts and major institutional shareholders before year-end results.
- Review all existing debt covenants that reference financial metrics derived from the income statement — IFRS 18 reclassification may trigger technical covenant breaches if not addressed proactively.
- Decide by Q3 2026 which management-defined performance measures will be retained, restructured, or discontinued in light of the new audited MPM disclosure requirement.
What Must the CFO Present to the Board on IFRS 18 This Year?
The board, and in particular the Audit Committee, has governance accountability for the integrity of financial reporting. IFRS 18 is a material change to the company’s financial statements — one that will affect the presentation of every reporting period from 2027 onwards. The CFO must bring a structured IFRS 18 board paper to the Audit Committee no later than Q3 2026, covering: the scope of changes to the income statement, the ERP implementation status, the approach to MPM disclosures, the investor relations communication plan, and the audit engagement status.
The UK Corporate Governance Code requires the board to ensure that the annual report and accounts present a fair, balanced, and understandable assessment of the company’s financial position. IFRS 18 transition is a board-level governance matter, not only a finance function delivery item. CFOs who treat this as an accounting project rather than a strategic reporting transition risk being caught short when auditors, analysts, and the FRC’s financial reporting review function begin scrutinising 2027 first-adopter disclosures. Use INFORMD’s executive assessment tools to benchmark your IFRS 18 readiness against peers.
- Executive Action: Present a comprehensive IFRS 18 readiness paper to the Audit Committee by September 2026, covering systems, disclosures, investor communications, and audit engagement.
- Ensure the Audit Committee approves the company’s approach to MPM selection and audited reconciliation notes before the 2026 annual report drafting process begins.
- Request that the external auditor includes IFRS 18 transition risk in the 2026 audit planning letter — this signals to the board that the transition is being formally managed.
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IFRS 18 is mandatory for reporting periods beginning on or after 1 January 2027, following UK Endorsement Board adoption in December 2025. However, because IFRS 18 requires retrospective application, 2026 comparative figures must be prepared under the new standard — making 2026 effectively the first implementation year for calendar-year-end companies.
Management-defined performance measures (MPMs) are subtotals of income and expense that management uses publicly to communicate financial performance — such as adjusted EBITDA or underlying operating profit. Under IFRS 18, all MPMs must be disclosed in a single, audited note to the financial statements with a reconciliation to the nearest IFRS line item.
IFRS 18 requires all income and expenses to be classified into three categories — operating, investing, and financing — and mandates two new subtotals: operating profit and profit before financing and income taxes. This replaces the more flexible IAS 1 approach and may change how companies present key financial metrics like EBIT and EBITDA.
Yes. Many debt covenants reference financial metrics such as operating profit or EBITDA derived from the income statement. IFRS 18’s reclassification of income and expense items may alter these metrics, potentially triggering technical covenant breaches. CFOs should review all credit agreements and renegotiate affected definitions before the 2027 effective date.
