IFRS 18 vs ASU 2024-03: The 2026 Income Statement Reform Comparison Every CFO Needs

Two major income statement standards arrive within months of each other, both triggered by the same investor frustration, yet structurally worlds apart. If your team is trying to decide which one applies, what each actually requires, and how to sequence implementation when both land on your desk simultaneously, this is the comparison you need.

Key takeaway: IFRS 18 rewrites the face of your profit and loss statement and requires retrospective restatement. ASU 2024-03 only adds a tabular footnote and is prospective by default. They are not the same reform, and treating them as equivalent will cost you.

What Is IFRS 18 and What Does It Replace?

IFRS 18, Presentation and Disclosure in Financial Statements, replaces IAS 1 entirely. The IASB issued it on April 9, 2024, after a development process that began with an Exposure Draft in December 2019. It is effective for annual reporting periods beginning on or after January 1, 2027, with retrospective application required. Early adoption is permitted, but entities that adopt early must disclose that fact, per the EFRAG Draft Endorsement Advice to the European Commission.

IFRS 18 introduces three structural innovations with no US GAAP parallel:

1. Five mandatory income statement categories on the face of the primary financial statement: operating, investing, financing from integral associates and joint ventures, financing from liabilities, and income tax.
2. Two required subtotals: operating profit (after the operating section, before investing) and profit before financing and income tax (after investing, before financing).
3. A Management Performance Measure (MPM) disclosure regime: any subtotal of income and expenses used in public communications outside the financial statements that is not required or specified by IFRS must be disclosed within the financial statements, with a reconciliation to the most directly comparable IFRS subtotal.

IFRS 18 also applies to all primary financial statements and the notes, covering the balance sheet and cash flow statement as well as the income statement. As EFRAG notes, "IFRS 18 focuses on improved aggregation and disaggregation of items in all primary financial statements and the notes, compared to the FASB's ASU No. 2024-03." There is no private company exemption: IFRS 18 applies to all entities reporting under IFRS Accounting Standards.

What Is ASU 2024-03 (DISE) and What Does It Actually Change?

ASU 2024-03, Disaggregation of Income Statement Expenses (DISE), does not touch the face of the income statement at all. The FASB issued it on November 4, 2024, adding ASC Subtopic 220-40. It is effective for public business entities (PBEs) for annual reporting periods beginning after December 15, 2026, and for interim periods within fiscal years beginning after December 15, 2027. A follow-on standard, ASU 2025-01 (issued January 6, 2025), clarified the interim effective date, an important technical correction that early summaries of DISE often missed.

What ASU 2024-03 requires is a new tabular footnote disclosure. For each "relevant expense caption" on the face of the income statement within continuing operations, entities must disaggregate the amounts into five natural expense categories:

1. Purchases of inventory
2. Employee compensation
3. Depreciation
4. Intangible asset amortization
5. DD&A recognized as part of oil-and-gas-producing activities, or other depletion expenses

The standard also requires disclosure of total selling expenses and, in annual periods, the entity's definition of selling expenses. Immaterial items are excluded, and entities may use accounting estimates or other methods that reasonably approximate the required amounts, per Deloitte's DART FAQ on ASU 2024-03.

ASU 2024-03 applies only to PBEs. Private companies, not-for-profit entities, and employee benefit plans are excluded, per PwC's In Depth guide on ASU 2024-03. That said, a private company preparing for an IPO would need to apply it when filing a registration statement.

Side-by-Side Comparison: IFRS 18 vs ASU 2024-03

The Critical Distinction: Face of Statement vs. Footnote

This is the operational divide that most comparisons gloss over, and it matters enormously for systems and investor communications.

IFRS 18 changes what appears on the primary financial statement. Every income and expense item must be classified into one of the five categories at the transaction level. That means chart-of-accounts changes, ERP reclassifications, and in many cases a rebuild of how the general ledger maps to the P&L. Analysts will see a standardized "operating profit" line for every IFRS reporter for the first time, which changes how they build models and compare companies across sectors.

ASU 2024-03 changes only the footnotes. The income statement itself looks identical after adoption. The work is aggregating natural expense data, which may already exist in cost accounting systems, and mapping it to functional expense captions. As PwC notes, "depending on an entity's specific facts and circumstances, new system and process changes may be required as well as coordination across geographies, business segments, and multiple reporting systems." That is not a trivial lift, but it is a different kind of lift from IFRS 18's face-of-statement restructuring.

For analyst models, the two standards serve different purposes. IFRS 18's mandatory operating profit subtotal gives analysts a standardized EBIT-like figure for IFRS reporters. ASU 2024-03's natural expense footnotes let analysts decompose functional cost lines for US GAAP reporters. These are complementary analytical tools, not substitutes.

The Dual Reporter Problem: Who Must Comply With Both?

This is the question no existing comparison article answers directly. If your company reports under IFRS and also has US-registered debt or equity, you may face both standards simultaneously.

You need IFRS 18 if your entity prepares financial statements under IFRS Accounting Standards, regardless of size or listing status.

You need ASU 2024-03 if your entity meets the ASC Master Glossary definition of a PBE. This includes SEC registrants, but also entities whose financial statements are required to be included in another SEC registrant's filing under Regulation S-X Rules 3-05 or 3-09.

You need both if you are a foreign private issuer (FPI) that prepares IFRS financial statements and also has US-registered securities, or a multinational with IFRS-reporting subsidiaries whose statements feed into a US GAAP consolidated filing.

The compounded complexity for dual reporters is real:

• IFRS 18 requires retrospective restatement of comparatives. ASU 2024-03 is prospective by default. For the same reporting period, you are running two different transition approaches.
• IFRS 18 applies to interim financial statements from day one of adoption (January 1, 2027 for calendar-year entities). ASU 2024-03 interim disclosures are not required until fiscal years beginning after December 15, 2027, meaning calendar-year companies face IFRS 18 interim requirements in Q1 2027 but ASU 2024-03 interim requirements only from Q1 2028.
• IFRS 18's MPM regime requires disclosing within the financial statements any non-IFRS subtotal used in public communications, with a reconciliation. For cross-listed companies also subject to SEC Regulation G, this creates a compliance coordination challenge: the MPM reconciliation in the IFRS financial statements and the Regulation G non-GAAP reconciliation in SEC filings must be consistent. No standard-setter has fully addressed this intersection yet.

Key takeaway for dual reporters: If you are considering early adoption of IFRS 18 (permitted), adopting for periods beginning January 1, 2026 would align your IFRS transition period with ASU 2024-03's annual effective date, potentially reducing the number of distinct transition periods your team manages. This is an active planning decision, not a default.

Transition Asymmetry: What You Need to Do Now

The transition requirements differ in ways that affect what your team should be doing today.

For IFRS 18:

• Retrospective application is mandatory. You will restate prior period comparatives.
• For a January 1, 2027 effective date, that means your 2026 comparative period must be restated. Data collection for 2026 is already underway.
• The MPM identification process, which requires cataloguing every non-IFRS subtotal used in earnings releases, investor presentations, and analyst calls, is a governance and controls project that typically takes 6 to 12 months.

For ASU 2024-03:

• Prospective application is the default. No restatement required.
• Retrospective application is an option. If you want comparative periods, you need to collect natural expense data for fiscal years beginning as early as 2025, per PwC. That window is already open.
• The tabular disclosure must cover each relevant expense caption. Entities should audit existing footnote disclosures now to avoid duplication or inconsistency with the new tabular format, per Deloitte's FAQ.

For implementation details on ASU 2024-03 specifically, including the inventory election and SAB 74 disclosure obligations, see Finrep's ASU 2024-03 implementation guide and the controls guide for SEC reporting teams. For a deep dive on IFRS 18's five categories, MPM identification, and sector exceptions, see the IFRS 18 practical guide.

Why Both Standards Arrived at the Same Time

The timing is not a coincidence. Both were responses to the same investor frustration: functional-format income statements obscure the nature of costs, which has fueled the proliferation of non-GAAP measures. PwC's April 2025 comment letter to the FASB puts the scale of the problem plainly: 97% of S&P 500 companies use non-GAAP measures and KPIs in communicating results to investors. A 2024 academic study cited by Crowe LLP found that 78% of US REITs disclosed a non-standardized, adjusted FFO measure despite NAREIT's standardized definition, illustrating how hard comparability is to achieve even with guidance.

The two standard-setters chose different mechanisms. The IASB went structural: fix the face of the statement, mandate subtotals, and bring non-GAAP measures inside the financial statements under the MPM regime. The FASB went incremental: leave the face of the statement alone and require more granular footnote disclosure. Neither approach fully solves non-GAAP proliferation on its own, but together they represent the most significant income statement reform since IFRS Accounting Standards were introduced.

ASU 2024-03 also sits within a broader FASB disclosure reform package alongside ASU 2023-07 (segment disclosures) and ASU 2023-09 (income tax disclosures). Crowe LLP recommended the FASB assess whether these three standards together provide sufficient investor information before launching a new Financial KPI project. Understanding ASU 2024-03 in isolation misses how the three standards collectively reshape the footnote landscape.

Will the FASB Eventually Adopt IFRS 18-Style Reform?

This is the forward-looking question that matters most for long-range planning, and the answer from the evidence is: possibly, in the 2030s, and the FASB is explicitly watching.

PwC's April 2025 comment letter recommended the FASB "closely follow the implementation of IFRS 18 to identify insights that could inform future US GAAP initiatives" and consider "a longer-term project on broader improvements to income statement presentation." PwC frames IFRS 18 as a standard that "aligns the income statement more closely with the statement of cash flows, introduces standardized income statement subtotals and permits disclosure of management performance measures within the financial statements", a structural reform that goes far beyond what ASU 2024-03 achieves.

The FASB's own research agenda includes a project to explore potential improvements to the statement of cash flows, which PwC recommends as a priority. If that project proceeds, it would move US GAAP closer to IFRS 18's cash-flow-aligned income statement structure. The convergence question is live and unresolved, but the direction of travel is clear enough that CFOs doing 5-to-10-year finance transformation planning should factor it in.

The practical implication: companies that invest in reclassifying expenses by nature for IFRS 18 or ASU 2024-03 are building data infrastructure that would also support a future US GAAP structural reform. That is a reasonable argument for treating the current implementation projects as strategic, not purely compliance-driven.

FAQ

Does ASU 2024-03 apply to private companies? No. ASU 2024-03 applies only to public business entities as defined in the ASC Master Glossary. Private companies, not-for-profit entities, and employee benefit plans are excluded. A private company preparing for an IPO would need to apply it when filing a registration statement such as Form S-1.

What replaces IFRS 18? IFRS 18 does not replace another income statement standard in the traditional sense. It replaces IAS 1, Presentation of Financial Statements, which governed how entities structured their primary financial statements. IFRS 18 is not a replacement for a prior income statement reform; it is the first wholesale restructuring of the P&L under IFRS since the standards were introduced.

When is ASU 2024-03 effective for private companies? ASU 2024-03 does not apply to private companies. There is no effective date for private entities. If a private company becomes a PBE through an IPO or acquisition, it would then need to comply.

What is the primary objective of ASU 2024-03? To require PBEs to disclose, in a tabular footnote, the amounts of five specified natural expense categories included in each relevant expense caption on the face of the income statement. The goal is to give investors better information about the nature of costs without changing how the income statement itself is presented.

Is there a US GAAP equivalent to IFRS 18's MPM disclosure? Not directly. IFRS 18 requires MPMs to be disclosed within the financial statements with a reconciliation to the most directly comparable IFRS subtotal. Under US GAAP, non-GAAP measures are governed by SEC Regulation G and Item 10(e) of Regulation S-K, which require reconciliation in SEC filings but not within the financial statements themselves. For cross-listed companies, the two regimes must be coordinated carefully.

Should a dual reporter adopt IFRS 18 early to align timelines? It depends on readiness. Early adoption of IFRS 18 (permitted, with disclosure of that fact) for periods beginning January 1, 2026 would mean your IFRS transition and ASU 2024-03's first annual period land in the same fiscal year, reducing the number of distinct transition periods. For companies with significant MPM identification work or ERP reclassification projects, the earlier start may be worth it. For companies still mapping their natural expense data, a 2027 adoption may be more realistic.