K‑IFRS 1118 in Korea, Implementation Guide for Foreign Companies (2026)

Last updated: April 27, 2026

This K‑IFRS 1118 Korea implementation guide 2026 is written for CFOs, finance directors and in‑country controllers at foreign‑invested companies preparing for the most significant change to Korean financial statement presentation in over a decade. In April 2026 the Financial Supervisory Service (FSS) released pre‑disclosure guidance outlining what preparers must communicate to investors ahead of the transition to K‑IFRS No. 1118, the Korean localisation of IFRS 18 Presentation and Disclosure in Financial Statements. Early adoption is permitted for accounting years beginning on or after 1 January 2026, while mandatory application takes effect for periods beginning on or after 1 January 2027.

Foreign subsidiaries that rely on Korean statutory accounts for group consolidation, regulatory filings and tax compliance face a compressed preparation window, this guide provides the step‑by‑step roadmap, sample disclosure language and practical checklists needed to stay ahead.

Executive Summary, What Foreign Companies Must Do Now

• Assess impact immediately. K‑IFRS 1118 redefines operating profit, introduces mandatory disclosure of management‑defined performance measures (MDPMs) and restructures the income statement into three new categories, operating, investing and financing. Every entity reporting under K‑IFRS must restate comparative periods and update internal KPI definitions.
• Prepare for FSS pre‑disclosure. Following the FSS guidance issued in April 2026, listed companies and large unlisted entities are expected to disclose, in advance of mandatory adoption, how the new standard will affect their financial statements. Preparers should begin drafting narrative and quantitative reconciliations now.
• Coordinate with parent groups and tax advisers. Reclassifications under K‑IFRS 1118 do not, by themselves, change taxable income, but they may trigger tax authority queries and require updates to transfer‑pricing documentation. Foreign subsidiaries must ensure local statutory packs reconcile cleanly with group reporting packs under the parent’s IFRS 18 timeline.

What Is K‑IFRS 1118? Key Changes to Financial Statement Presentation

K‑IFRS 1118 is the Korean adoption of IFRS 18, issued by the Korean Accounting Standards Board (KASB) to replace K‑IFRS 1001 (Presentation of Financial Statements). Its objective is to standardise profit presentation so that investors receive more comparable, decision‑useful information across companies and industries.

The core changes fall into three areas:

• Structured income statement. The statement of profit or loss must now present three defined categories, operating, investing and financing, with required subtotals for operating profit and profit before financing and income taxes. This replaces the previous approach where the definition and placement of operating profit varied by entity.
• Defined operating profit. Operating profit is residually determined: it includes all income and expenses that are not classified as investing or financing. Certain items previously buried within operating profit (e.g., share of profit of associates, fair‑value gains on non‑operating investments) must now be reclassified to the investing category.
• Management‑defined performance measures (MDPMs). Where companies use non‑GAAP measures such as “adjusted EBITDA” or “core operating profit” in public communications, K‑IFRS 1118 requires those measures to be disclosed in the notes with a reconciliation to the nearest K‑IFRS‑defined subtotal.
• Enhanced disaggregation. Entities must disaggregate line items more granularly, guided by the standard’s new “useful grouping” principle, and provide clearer labelling so that mixed‑function expenses are transparent.

In practical terms, a Korean income statement prepared under the old standard might show a single “operating profit” line that included equity‑method gains on associates. Under K‑IFRS 1118, that same line must exclude those gains, they move to the investing category, potentially lowering the reported operating profit figure while leaving net income unchanged.

Effective Dates and Early Adoption, Timeline of K‑IFRS 2026 Korea Obligations

Effective Dates: Mandatory and Early Adoption

The KASB published the final text of K‑IFRS 1118 alongside implementation guidance and an updated taxonomy aligned with the IFRS Foundation’s Korean‑language IFRS Taxonomy for IFRS 18.

Regulator Guidance Issued April 2026, What It Requires Now

In April 2026 the FSS issued pre‑disclosure guidance directing listed companies and significant unlisted entities to begin communicating the expected impact of K‑IFRS 1118 to investors well before mandatory adoption. The guidance, reported by the Seoul Economic Daily and other Korean financial press, specifically asks preparers to:

1. Quantify the expected change to operating profit and other key subtotals.
2. Explain the primary drivers of any reclassification (e.g., equity‑method income, foreign‑exchange gains, fair‑value movements).
3. Describe changes to accounting policies and the approach to MDPMs.

Industry observers expect that companies failing to provide adequate pre‑disclosure will face increased scrutiny during the first statutory audit cycle under the new standard.

K‑IFRS 1118 Impact on Operating Profit, Calculation, Classification and Examples

New Measurement and Classification Rules

The K‑IFRS impact on operating profit is the single most visible change for financial statement users. Under the new standard:

• Operating profit is a residual. All income and expenses default to the operating category unless the standard specifically assigns them to investing or financing.
• Investing category absorbs share of profit or loss of associates and joint ventures, gains and losses on disposal of non‑current assets, income from investments not related to core operations, and fair‑value gains or losses on financial assets held for non‑operating purposes.
• Financing category captures interest income and expense (for non‑financial entities), foreign‑exchange gains and losses on financing activities, and the unwinding of discount on provisions.

Worked Example, Manufacturing Company

In this example the manufacturer’s operating profit margin falls from 22.6 % to 18.0 %, not because underlying performance has changed, but because K‑IFRS 1118 reclassifies equity‑method income and FX gains out of operating profit. Profit before tax remains identical.

Worked Example, Services Company

A technology services subsidiary with minimal associate investments but significant interest income from cash deposits would see a smaller shift. If ₩ 5 billion of interest income currently sits within operating profit, K‑IFRS 1118 reclassifies it to financing, reducing operating profit by that amount. Services entities with few non‑operating items may experience marginal changes, but the disclosure burden, particularly for MDPMs, remains the same.

Reconciliation: Legacy Operating Profit to K‑IFRS 1118 Operating Profit

Every entity must prepare a reconciliation bridge in its notes. Industry observers expect that preparing this bridge early, even before mandatory adoption, will be viewed favourably by auditors and the FSS during the pre‑disclosure phase.

Korea Financial Statement Disclosures 2026, Requirements and Sample Footnotes

Mandatory Disclosure Checklist

K‑IFRS 1118 introduces a layered disclosure framework. At minimum, preparers must disclose:

• Accounting policy changes. A description of the transition from K‑IFRS 1001 to K‑IFRS 1118, the classification approach adopted, and the date of initial application.
• Quantitative reconciliation. A line‑by‑line reconciliation from previously reported operating profit to K‑IFRS 1118 operating profit for at least one comparative period.
• MDPMs. Where management uses non‑GAAP measures in earnings releases, investor presentations or MD&A, those measures must appear in the notes with a clear reconciliation to the closest K‑IFRS subtotal.
• Disaggregation basis. Disclosure of how operating expenses have been disaggregated (by nature, by function, or a combination) and why the chosen approach provides useful information.
• Reclassification drivers. A narrative explaining the most significant items reclassified out of operating profit and into the investing or financing categories.

Sample Disclosure Language

Note for foreign investors: Where a company’s investor base includes non‑Korean speakers, the FSS disclosures under K‑IFRS should also be made available in English. This is particularly relevant for foreign subsidiaries whose parent groups require English‑language statutory accounts for consolidation.

FSS Expectations for Pre‑Disclosure

The April 2026 FSS guidance emphasises that pre‑disclosure should not be a cursory statement. Regulators expect preparers to explain the magnitude and direction of changes to key subtotals, identify the top three to five reclassification drivers, and describe how investor communications will be updated. Early indications suggest that the FSS will monitor compliance with pre‑disclosure expectations through its regular review programme for financial statements.

Statutory Reporting Checklist for Foreign‑Owned Subsidiaries in Korea

Foreign subsidiary reporting in Korea requires coordination across multiple stakeholders. The following checklist covers the critical workstreams for a K‑IFRS 1118 transition:

1. Gap analysis. Map current income statement line items to the K‑IFRS 1118 three‑category structure; identify every item requiring reclassification.
2. Chart of accounts update. Amend the local chart of accounts and ERP mapping tables to accommodate new subtotals and categories; ensure the general ledger can produce both legacy and new‑format trial balances during the transition period.
3. Group reporting pack reconciliation. Align local statutory packs with the parent entity’s IFRS 18 reporting pack; document any permanent differences arising from Korean regulatory adjustments.
4. Comparative restatement. Prepare restated comparatives for at least one prior period; validate that the net income remains unchanged after reclassifications.
5. MDPM governance. If the local entity or its parent uses management‑defined performance measures, establish a governance process for defining, calculating and reconciling those measures in the notes.
6. Auditor engagement. Notify the Korean statutory auditor of the transition timeline and agree on the scope of work for restatement review; confirm whether early adoption triggers a change in the auditor’s report wording.
7. Board and governance approval. Secure board approval for the change in accounting policy; minute the board resolution before the first reporting period under K‑IFRS 1118.
8. Regulator pre‑disclosure (if applicable). Prepare and file pre‑disclosure materials in line with FSS guidance; retain documentation of the narrative and quantitative analysis provided.
9. Tax and TP review. Coordinate with the tax team to assess whether reclassifications affect benchmarking data, segmental reporting or intercompany pricing documentation.
10. English‑language disclosures. Where required by the parent, prepare English translations of key statutory notes and reconciliations.

Tax and Transfer‑Pricing Implications, What to Watch

Corporate Tax Returns, Permanent Differences vs Accounting Changes

K‑IFRS 1118 is a presentation and disclosure standard; it does not create new recognition or measurement requirements. As a result, the reclassification of items between operating, investing and financing categories should not, in itself, change the computation of taxable income under the Korean Corporate Tax Act. Existing temporary and permanent differences remain unchanged.

However, because the Korean National Tax Service (NTS) reviews financial statements as part of its assessment process, changes to the appearance and magnitude of operating profit may prompt questions during tax audits. Preparers should retain clear documentation showing that the reclassifications are presentation‑only and do not alter the tax base.

Transfer Pricing and Management KPIs, Documentation Concerns

Transfer‑pricing documentation routinely relies on operating profit margins as the tested‑party indicator. When K‑IFRS 1118 reclassifies items that were previously within operating profit, the entity’s TP benchmarking ratios may shift. Early indications suggest that the NTS and Korea’s TP examination teams will expect taxpayers to explain any year‑on‑year changes in profitability indicators that arise from the standard change rather than from changes in transfer‑pricing policy.

Practical steps include:

• Updating the local TP file to state that operating profit is now measured under K‑IFRS 1118 and reconciling to prior‑year figures.
• Reviewing the choice of profit‑level indicator (PLI) in the TP documentation to confirm it remains appropriate under the new classification.
• Coordinating with the parent group’s TP team so that the same PLI definition is used across jurisdictions that have adopted IFRS 18.

Early Adoption of K‑IFRS 1118, Pros and Cons for Foreign Groups

Foreign parent companies whose Korean subsidiaries report under K‑IFRS face a strategic decision: adopt K‑IFRS 1118 early for the 2026 financial year, or wait for mandatory application in 2027. The right answer depends on three factors.

• Group alignment. If the parent has already adopted IFRS 18 for its consolidated accounts beginning 1 January 2026, early adoption in Korea eliminates reconciliation differences and simplifies group reporting.
• Investor expectations. Listed Korean subsidiaries or entities with Korean institutional investors may benefit from early adoption to demonstrate transparency and alignment with global best practice. The KCMI’s research on adoption timing notes that capital‑market participants favour comparability.
• Systems and resource readiness. Early adoption compresses the timeline for chart‑of‑accounts changes, auditor coordination and disclosure drafting. Entities with limited local finance teams may prefer the additional year to prepare.

Decision flowchart:

1. Has the parent adopted IFRS 18 for 2026? → If yes, early adoption is strongly recommended for alignment.
2. Is the Korean entity listed on the KRX or subject to FSS review? → If yes, early adoption enhances pre‑disclosure credibility.
3. Are local systems and audit resources ready? → If no, delay to 2027 but begin preparation immediately.

K‑IFRS 1118 Korea Implementation Guide 2026, Practical Roadmap (90 / 180 / 360 Days)

Each phase should include a formal sign‑off checkpoint. Assign a single project lead within the Korean finance team who acts as the liaison between the local statutory auditor, the parent’s group reporting function, and external tax advisers.

Common Pitfalls and Controls to Avoid Restatements and Regulator Queries

Based on implementation experience across similar IFRS transitions, the following pitfalls are most likely to arise during the K‑IFRS 1118 adoption:

• Inconsistent KPI definitions. Using a different definition of “operating profit” in the MD&A versus the statutory financial statements creates confusion and regulatory risk. Align all external communications to the K‑IFRS 1118 definition.
• Missing reconciliations. Failing to provide a quantitative bridge from legacy operating profit to the new operating profit is the single most common disclosure deficiency flagged by auditors in early adoption scenarios.
• English disclosure gaps. Foreign subsidiaries that provide only Korean‑language statutory notes leave their parent group without the documentation needed for consolidation and investor queries.
• Late auditor engagement. Waiting until year‑end to discuss the transition with the statutory auditor compresses review timelines and increases the risk of audit qualifications.
• Overlooking TP documentation. Entities that update their financial statements but not their TP local files face queries during the next NTS examination cycle.
• Insufficient board documentation. The change in accounting policy requires a board resolution; entities that fail to minute this properly may face governance queries from both auditors and regulators.

Reporting Obligations by Entity Type, Comparison Table

Appendix, Worked Examples and Downloadable Resources

The following resources support the practical implementation steps outlined in this K‑IFRS 1118 Korea implementation guide 2026:

• Statutory reporting checklist (Excel). A downloadable 10‑item checklist covering gap analysis through to final filing, with owner assignments, milestone dates and sign‑off columns, contact the editorial team for access.
• Sample disclosure templates. Three ready‑to‑adapt footnote templates (listed company, unlisted entity, foreign subsidiary) reflecting the sample language provided in the disclosure section above.
• Worked example spreadsheets. Two industry‑specific models (manufacturing and technology services) showing the reclassification bridge from legacy to K‑IFRS 1118 operating profit, including margin impact calculations.

These resources are designed to accelerate the transition for foreign‑owned subsidiaries and should be tailored to each entity’s specific circumstances in consultation with Korean accounting and tax advisers.

Sources

1. Seoul Economic Daily, FSS Issues Disclosure Guidelines Ahead of New Accounting Standard
2. Korea Accounting Standards Board (KASB), Standards and Implementation Materials
3. PwC Korea (Samil PwC), K‑IFRS 1118 Technical Brief
4. IFRS Foundation, Korean IFRS Taxonomy for IFRS 18
5. Korea Capital Markets Institute (KCMI), Research on K‑IFRS 1118 Adoption Timing
6. PwC Korea, K‑IFRS 1118 Implementation Seminar (April 2026)
7. Asia Economy (Asiae), Coverage of FSS K‑IFRS Guidance
8. Newsis, K‑IFRS 1118 Regulatory Update