International Accounting Standards (IAS) are the original set of global financial reporting rules, first issued in 1973, that dictate how companies prepare and present their financial statements. Ten countries’ professional accounting bodies created them to fix a practical problem: investors could not compare companies across borders because every country measured revenue, inventory, and depreciation differently. Today IAS sit inside the broader International Financial Reporting Standards (IFRS) framework maintained by the International Accounting Standards Board (IASB), and more than 140 jurisdictions require or permit their use.
Where IAS Came From
The International Accounting Standards Committee (IASC) was formed in 1973 through an agreement among professional accounting bodies from Australia, Canada, France, Germany, Japan, Mexico, the Netherlands, the United Kingdom, Ireland, and the United States. Its job was to develop a common set of financial reporting rules and push for their acceptance worldwide. Before the standards existed, a company reporting profits in Germany might look unprofitable under Japanese rules simply because the two countries measured inventory, revenue, or depreciation on different bases.
Over 27 years, the IASC issued a numbered series (IAS 1, IAS 2, and so on) covering the presentation of financial statements, employee benefits, foreign currency transactions, and much else. The standards did not replace national rules overnight, but they gave regulators and stock exchanges a reference point they could adopt or align with.
How IAS and IFRS Fit Together
The difference between IAS and IFRS is mostly naming and timing. Standards issued before 2001 kept their “IAS” labels and numbering. Everything issued afterward by the IASB carries an “IFRS” designation. Both function as one framework: when a company says it reports under IFRS, it applies whichever IAS and IFRS standards touch its operations.
Several original IAS still carry weight. IAS 1 remains the foundational standard for how companies structure their financial statements.1IFRS Foundation. IAS 1 Presentation of Financial Statements IAS 2, governing inventory accounting, is another the IASB continues to maintain.2IFRS Foundation. IAS 2 Inventories Others have been superseded. The old lease standard, IAS 17, was replaced by IFRS 16 in 2019, which required companies to put nearly all leased assets and the corresponding liabilities on their balance sheets rather than disclose them in footnotes.3IFRS Foundation. New Standard on Leases Now Effective The old revenue standard, IAS 18, was replaced by IFRS 15, a converged standard developed jointly with the U.S. Financial Accounting Standards Board.4FASB. IASB and FASB Issue Converged Standard on Revenue Recognition
The IASB’s broad strategy is to replace the older, rule-heavy IAS with newer, more principle-based IFRS over time. The number of active IAS has shrunk as replacements are issued, and the surviving ones get periodically amended to stay consistent with evolving IFRS concepts.
What IAS 1 Requires in a Set of Financial Statements
IAS 1 sets the baseline for what a “complete set of financial statements” looks like. Any company reporting under IFRS must present all of the following:1IFRS Foundation. IAS 1 Presentation of Financial Statements
- A statement of financial position: assets, liabilities, and equity at the reporting date (often called a balance sheet).
- A statement of profit or loss and other comprehensive income covering revenues, expenses, and gains or losses during the period. Companies can present this as one combined statement or split it into two.
- A statement of changes in equity showing how shareholders’ equity moved from the start to the end of the period.
- A statement of cash flows, broken into operating, investing, and financing activities.
- Notes explaining accounting policies, assumptions, and other details that help a reader understand the numbers.
The standard also requires comparative figures from the prior period so users can see trends. When a company changes an accounting policy retroactively, it must add an extra balance sheet from the beginning of the earliest comparative period.
Who Sets and Interprets the Standards Today
In 2001 the IASC was restructured into the IASB, which held its first official meeting in April of that year. The reorganization created an independent standard-setting body under the IFRS Foundation, a nonprofit responsible for governance, funding, and public accountability. The goal was to insulate standard-setting from political pressure and industry lobbying.
The IASB has 14 members chosen for a mix of technical expertise and geographic diversity.5IFRS Foundation. International Accounting Standards Board They develop new standards (now labeled IFRS), amend the legacy IAS that remain in force, and interpret how standards apply in practice. The Board publishes discussion papers and exposure drafts, invites public comment from regulators, auditors, companies, and investors, and conducts field testing before issuing anything. A final standard requires at least 9 members voting in favor.6IFRS Foundation. Due Process Handbook The high threshold makes it harder for any narrow interest to push through a rule that lacks broad support.
When companies handle the same transaction inconsistently, the IFRS Interpretations Committee reviews the issue and either publishes guidance on how existing standards apply or recommends that the IASB amend the standard.7IFRS Foundation. IFRS Interpretations Committee These interpretations are binding and carry the same weight as the standards themselves.
Sitting behind the individual standards is the Conceptual Framework for Financial Reporting, which defines what assets, liabilities, equity, income, and expenses mean and sets out the qualities that make financial information useful. The Framework is not itself a standard; when a specific IAS or IFRS conflicts with it, the standard wins.8IFRS Foundation. Purpose and Status of the Conceptual Framework
Where the Standards Are Used, and Where They Aren’t
More than 140 jurisdictions now require or permit IFRS Accounting Standards, and the IFRS Foundation maintains profiles for 169 jurisdictions tracking how each one applies them.9IFRS Foundation. Who Uses IFRS Accounting Standards The European Union mandated IFRS for the consolidated financial statements of all publicly traded companies starting in 2005.10IFRS Foundation. Use of IFRS Standards by Jurisdiction – European Union Australia, Canada, South Africa, and many other major economies have followed.
The United States is the notable holdout. Domestic companies file under U.S. Generally Accepted Accounting Principles (GAAP), overseen by FASB, and the SEC has not permitted domestic issuers to switch to IFRS.11U.S. Securities and Exchange Commission. Work Plan for the Consideration of Incorporating International Financial Reporting Standards Foreign companies that list shares in the U.S. as foreign private issuers can file IFRS financial statements without reconciling to U.S. GAAP, a rule adopted in 2007.12U.S. Securities and Exchange Commission. Acceptance From Foreign Private Issuers of Financial Statements Prepared in Accordance With International Financial Reporting Standards Many U.S.-headquartered multinationals also use IFRS internally for management reporting because it simplifies consolidating subsidiaries in IFRS jurisdictions.
The two frameworks agree on many fundamentals, but a few technical differences still affect how the same transaction shows up on the statements. Inventory is the most cited: IFRS prohibits the last-in, first-out (LIFO) method, while U.S. GAAP permits it. LIFO assigns the cost of the most recently purchased inventory to the cost of goods sold, which reduces reported profits and tax bills during periods of rising prices. IFRS bans it because it can leave stale inventory values on the balance sheet and complicates cross-border comparison. Revenue recognition, on the other hand, is largely converged: IFRS 15 and ASC Topic 606 share a nearly identical five-step model.4FASB. IASB and FASB Issue Converged Standard on Revenue Recognition Lease accounting saw a similar joint effort, though the final standards diverged: IFRS 16 uses a single on-balance-sheet model, while the U.S. equivalent (ASC 842) retains a distinction between operating and finance leases on the income statement.13IFRS Foundation. IFRS 16 Effects Analysis
A Lighter Version for Smaller Companies
Not every company needs the full weight of IFRS. The IASB publishes a separate standard, the IFRS for SMEs Accounting Standard, designed for companies without public accountability, meaning they do not trade shares or debt on a public market and do not hold assets in a fiduciary capacity like a bank or insurer. It drops topics that don’t apply to typical smaller companies, offers fewer accounting policy options, simplifies recognition and measurement rules, requires far fewer disclosures, and is written in plainer language.14IFRS Foundation. The IFRS for SMEs Accounting Standard
Practical differences include lease accounting (SMEs still classify leases as operating or finance rather than using the right-of-use model in IFRS 16), borrowing costs (always expensed rather than capitalized), and goodwill (amortized over its useful life, capped at ten years when that life can’t be reliably estimated, instead of the annual impairment testing required under full IFRS). The IASB updated the standard in February 2025, with the new edition effective for reporting periods beginning on or after January 1, 2027, and early adoption permitted.14IFRS Foundation. The IFRS for SMEs Accounting Standard
Switching to IFRS for the First Time
Companies moving from a national accounting framework to IFRS follow IFRS 1, which governs the transition. The standard requires an opening IFRS balance sheet at the “date of transition,” the starting point of the earliest comparative period the company will present. In that opening balance sheet, the company must recognize all assets and liabilities that IFRS requires, remove any that IFRS does not permit, and reclassify items where IFRS categorizes them differently than the old rules did.15IFRS Foundation. IFRS 1 First-time Adoption of International Financial Reporting Standards
The first IFRS financial statements must include at least three balance sheets, two income statements, two cash flow statements, and two statements of changes in equity, along with reconciliations showing how equity and profit or loss changed between the old rules and IFRS.15IFRS Foundation. IFRS 1 First-time Adoption of International Financial Reporting Standards The reconciliations force a company to quantify every difference between its old accounting and IFRS, giving investors a clear picture of what changed and why.