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What is IFRS? International accounting standards explained

If you invest in a company listed in London, Tokyo, or Toronto, you will encounter financial statements prepared under IFRS, not GAAP. IFRS (International Financial Reporting Standards) is the accounting framework used by over 140 countries and territories. For investors who compare companies across borders or own international equities, understanding IFRS is as essential as understanding GAAP.

The key difference is philosophical: IFRS is principles-based, while GAAP is rules-based. IFRS tells you the objective and the fundamental principle; companies decide how to apply it. GAAP tells you exactly what to do in specific situations. This contrast shapes everything from how companies recognize revenue to whether they can revalue their buildings.

Quick definition: IFRS (International Financial Reporting Standards) is a set of standardized accounting rules that 140+ countries and thousands of companies use to prepare consolidated financial statements. Maintained by the International Accounting Standards Board (IASB), IFRS is principles-based and emphasizes judgment and the substance of transactions over rigid rules.

Key takeaways​

  • IFRS is the mandatory accounting framework for listed companies in the European Union, United Kingdom, Canada, Australia, and most of Asia-Pacific.
  • The International Accounting Standards Board (IASB) is an independent organization that writes and maintains IFRS.
  • IFRS is principles-based: it sets objectives and principles, then relies on companies and auditors to exercise judgment in application.
  • Major structural differences between IFRS and GAAP include inventory costing (IFRS prohibits LIFO), asset revaluation (IFRS allows it), and impairment reversals (IFRS allows them; GAAP does not).
  • US public companies are not required to use IFRS, though foreign private issuers filing with the SEC can use IFRS as filed.
  • Many multinational companies prepare consolidated statements under IFRS and then reconcile to GAAP for US filing.

1. The history and adoption of IFRS​

Before IFRS, the world had chaos. Every country had its own accounting standards. A company listed in Germany followed German rules; the same company's subsidiary in France followed French rules. This made global comparisons nearly impossible and complicated international capital flows.

The IASB was founded in 1973 (originally as the International Accounting Standards Committee, or IASC). For decades it had limited influence. But after the Asian financial crisis of 1997, regulators and investors demanded a unified global standard. In 2002, the EU passed a regulation requiring all listed European companies to use IFRS starting in 2005. This was the tipping point. If Europe was going IFRS, most of the world followed.

Today, IFRS is mandatory for listed companies in:

  • All EU member states
  • The United Kingdom
  • Canada
  • Australia
  • Japan (partially, through IFRS-equivalent standards)
  • India
  • Mexico
  • Brazil
  • South Africa
  • Most of Southeast Asia

The US is a notable exception. US SEC rules still require GAAP for domestic public companies, though foreign private issuers can file using IFRS. This is a historical anomaly: the US created the FASB and GAAP framework decades ago and has been reluctant to abandon it.

2. The IASB and the IFRS standard-setting process​

The International Accounting Standards Board (IASB) is an independent, nonprofit organization headquartered in London. It operates under the oversight of the IFRS Foundation, a nonprofit organization that governs the IASB and ensures accountability and due process.

The IASB has 14 board members from different countries and accounting backgrounds (big-firm partners, preparers, academics, and auditors). When the IASB identifies an accounting issue that needs a standard or an update, it follows a deliberative, public process:

  1. Planning: Identify the issue and decide whether to add it to the IASB's agenda.
  2. Preliminary research phase: Gather evidence on current practice and the effects of alternatives.
  3. Public discussion paper: Publish a DP outlining the issue and inviting comments.
  4. Exposure draft: Publish a proposed standard and solicit feedback (usually 120 days of public comment).
  5. Board redeliberations: The IASB discusses comments and revises the standard.
  6. Final standard: Issue the completed standard with an effective date.

The process is transparent and lengthy, often taking 3–5 years from inception to final standard. This rigor is intentional: accounting standards affect billions of dollars of capital allocation and must be well-founded.

3. IFRS as a principles-based framework​

The defining feature of IFRS is that it is principles-based. Each standard articulates an objective and a set of principles; companies and auditors then exercise professional judgment to apply those principles to specific facts and circumstances.

For example, IAS 2 (Inventory) sets the principle that inventories should be valued at the lower of cost or net realizable value. But IAS 2 does not prescribe exactly how to calculate cost. A company can use FIFO, weighted average, or specific identification. (LIFO is not allowed, but the principle—valuing at the lower of cost or NRV—is clear, and the company has judgment.)

Similarly, IFRS 15 (Revenue from Contracts with Customers, the counterpart to ASC 606) is principles-based. It defines a performance obligation, a transaction price, and satisfaction of the obligation. But it does not have industry-specific guidance like old GAAP did. Companies must interpret the principles for their industry and business model.

This approach has advantages and disadvantages:

Advantages of principles-based IFRS:

  • Flexibility: Companies can apply principles to novel or complex transactions without waiting for the IASB to write a specific rule.
  • Substance over form: The focus is on the economic reality, not whether a transaction technically meets a bright-line rule.
  • Global consistency in principle: Because the principle is clear (even if application varies), statements across countries are more conceptually aligned.
  • Evolution without rulemaking: As business evolves, companies can apply principles to new situations; the standard does not become obsolete.

Disadvantages of principles-based IFRS:

  • Uncertainty: Without detailed guidance, preparers and auditors must interpret principles, leading to disagreement and inconsistency.
  • Comparability challenges: Two companies in the same industry might apply the same principle differently.
  • Audit complexity: Auditors must evaluate whether a judgment call "fairly reflects the economic substance," which is more subjective than checking a bright-line rule.
  • Loopholes: Principle-based standards can be exploited through clever structuring (as long as the structure has economic substance).

4. The Conceptual Framework: IFRS's philosophical foundation​

Like GAAP, IFRS rests on a Conceptual Framework, a theoretical foundation that explains why IFRS exists and what principles underlie it. The IASB updated its Conceptual Framework in 2018.

The Conceptual Framework defines the objective of general-purpose financial reporting: to provide financial information about an entity that is useful to investors, creditors, and other users in making decisions. It then articulates the fundamental qualitative characteristics of useful financial information:

  • Relevance: Information is capable of influencing economic decisions.
  • Faithful representation: Information accurately depicts the economic phenomenon without bias or error.

It also lists enhancing characteristics:

  • Comparability: Information can be compared across time periods and across entities.
  • Verifiability: Independent parties can confirm the information.
  • Timeliness: Information is available in time for decision-making.
  • Understandability: Information is comprehensible to users with reasonable knowledge.

The IASB also recognizes a constraint: the benefits of providing information should outweigh the costs of providing it.

This framework is less detailed than GAAP's Conceptual Framework but more explicitly principles-focused. It makes clear that IFRS prioritizes faithful representation of economic substance.

5. The architecture of IFRS: The IAS/IFRS system​

IFRS standards are organized by number and category:

  • IAS (International Accounting Standards): Standards issued before 2001 under the old IASC framework. They are still in effect and form the backbone of IFRS. Examples: IAS 1 (Presentation of Financial Statements), IAS 2 (Inventories), IAS 7 (Cash Flow Statements), IAS 16 (Property, Plant and Equipment).
  • IFRS (International Financial Reporting Standards): Standards issued from 2001 onward under the newer IASB framework. Examples: IFRS 15 (Revenue), IFRS 16 (Leases), IFRS 9 (Financial Instruments).

There is no meaningful difference between IAS and IFRS; the naming is historical. Together, they form the complete IFRS suite.

The IASB also issues Interpretations (guidance on applying existing standards when a question is unclear) under the IFRS Interpretations Committee.

6. Revenue recognition under IFRS 15​

In 2018, the IASB issued IFRS 15 (Revenue from Contracts with Customers), aligned with GAAP's ASC 606. Both standards use a five-step model:

  1. Identify the contract.
  2. Identify performance obligations.
  3. Determine the transaction price.
  4. Allocate the price to performance obligations.
  5. Recognize revenue when (or as) a performance obligation is satisfied.

Despite the alignment, nuances remain. IFRS allows more judgment in determining whether performance obligations are satisfied over time or at a point in time. GAAP has slightly more prescriptive guidance in certain industries.

For investors, the takeaway is: IFRS 15 and ASC 606 look similar, but they are not identical. If you are comparing a US company (ASC 606) to an international company (IFRS 15), read both footnotes carefully. Revenue recognition is a leading source of earnings manipulation, and judgment matters.

7. Fixed assets and revaluation: GAAP vs IFRS divergence​

One of the starkest differences between GAAP and IFRS is the treatment of fixed assets (property, plant, and equipment).

Under GAAP, companies record fixed assets at cost and then depreciate them over their useful lives. Once an asset is on the books at cost, it stays there. Upward revaluation is not allowed (except for certain oil and gas properties under specific rules).

Under IFRS, companies can choose one of two models for fixed assets:

  1. Cost model (similar to GAAP): Record at cost and depreciate.
  2. Revaluation model: Periodically revalue the asset to its fair value (market value, appraised value, or replacement cost), with the gain or loss going to "Other Comprehensive Income" (a special equity account) or, in some cases, the income statement.

Revaluation allows a company to adjust the balance sheet to reflect current economic values. If a real estate company owns a building that cost $10 million in 1990 and is now worth $50 million, the company can revalue it on the balance sheet to $50 million. This makes the balance sheet more current but also introduces subjectivity (who determines fair value?).

For investors, this means comparing a GAAP company's balance sheet to an IFRS company's balance sheet is not apples-to-apples. The IFRS company's fixed assets might reflect current values; the GAAP company's are historical costs. This affects asset ratios, ROA (return on assets), and debt-to-equity ratios.

8. Impairment and reversal: another key difference​

Under GAAP, when a long-lived asset is impaired (loses value), the company writes it down. Once written down, GAAP does not allow the impairment to be reversed even if the asset recovers value later. This is called the "no impairment reversal" rule and is based on conservatism—once you admit a loss, you cannot take it back.

Under IFRS, impairment reversals are allowed (with limitations). If an asset was impaired and then recovers value, the company can reverse the impairment, increasing the asset value on the balance sheet and recognizing a gain. This is more faithful to economic substance: if the asset is actually worth more now, the balance sheet should reflect it.

This creates a divergence in earnings volatility. A GAAP company might show a one-time impairment charge but then hide the asset's subsequent recovery. An IFRS company would show both the impairment and the recovery, making earnings more volatile but also more transparent to economic reality.

9. Inventory costing: IFRS prohibits LIFO​

As mentioned in the GAAP article, GAAP allows LIFO (Last In, First Out) inventory costing. IFRS forbids it.

Under LIFO, companies match the most recent (highest) costs to current sales, which lowers earnings in inflationary periods and reduces taxable income. The US allows this for tax purposes, which is why many US companies use LIFO. But IFRS considers LIFO to be economically misleading because it does not match the actual flow of inventory; inventory that came in last does not actually go out last in most real-world scenarios.

This difference has enormous implications. A US company using LIFO might report lower earnings than a European company using FIFO or weighted average, even if their operations are identical. For investors comparing a US and European company, you must adjust for this.

The FASB has discussed banning LIFO but has not done so, partly due to tax complexity and industry pushback. So this difference persists.

10. Leases and liability recognition​

IFRS 16 (Leases) requires companies to recognize most leases on the balance sheet as a right-of-use asset and corresponding lease liability. This aligns with ASC 842 (the updated GAAP standard adopted in 2019).

However, IFRS 16 and ASC 842 have subtle differences in exemptions, measurement, and transition. For long-term leases, the definitions are similar, but the devil is in the details. An investor comparing lease obligations across GAAP and IFRS companies should read the lease footnote carefully.

11. Deferred tax assets and liabilities​

Both GAAP and IFRS recognize deferred tax assets and liabilities to reflect timing differences between book income and taxable income. But IFRS and GAAP differ on when a deferred tax asset can be recognized and how to measure it.

IFRS requires companies to assess the "probability" that a deferred tax asset will be realized (more uncertain). GAAP uses a "more likely than not" standard (more stringent). This affects how much deferred tax assets appear on the balance sheet.

In times of loss or uncertainty, an IFRS company might recognize more deferred tax assets than a GAAP company, making the balance sheet look stronger. Conversely, if the tax assets prove unrealizable, the IFRS company must write them down, creating a surprise loss.

12. Convergence and divergence between GAAP and IFRS​

The FASB and IASB have been working toward convergence since 2002. Some standards are now nearly identical:

  • Revenue recognition (ASC 606 and IFRS 15): Aligned, with minor differences.
  • Leases (ASC 842 and IFRS 16): Aligned, with some technical differences.
  • Financial instruments: Partially aligned (IFRS 9 and ASC 326 use different models for expected credit losses, though the results are often similar).

However, significant differences persist:

  • Inventory costing: GAAP allows LIFO; IFRS does not.
  • Fixed-asset revaluation: IFRS allows it; GAAP does not.
  • Impairment reversal: IFRS allows it; GAAP does not.
  • Development costs: IFRS allows capitalization under certain conditions; GAAP expenses them.
  • Presentation: IFRS and GAAP differ on income statement structure (classified vs unclassified expense presentation).

The SEC has discussed allowing or even requiring IFRS for US companies, but no decision has been made. Convergence continues, but full convergence is unlikely in the near term.

Real-world examples​

Nestlé and Unilever: Both are multinational companies. Nestlé (Swiss, listing in Switzerland and US) reports under IFRS. Unilever (Anglo-Dutch) also reports under IFRS. If you compare their balance sheets, both use the same principles, making comparison easier. But if you compare Nestlé to Coca-Cola (US, GAAP), you must adjust for differences in asset valuation, impairment, and inventory costing.

Siemens (German, IFRS): Siemens revalues fixed assets periodically under IFRS's revaluation model. This means its property, plant, and equipment on the balance sheet reflects more recent market values than a comparable US company would show. Its asset base and ROA calculations are thus not directly comparable to GAAP peers.

Toyota's inventory (Japanese, IFRS): Toyota uses weighted-average cost, not LIFO. This makes its gross margin and inventory accounting directly comparable to other IFRS companies but not to US LIFO peers like Ally Financial.

Common mistakes​

Mistake 1: Assuming IFRS is simpler. Principles-based does not mean simpler. IFRS requires more judgment, which means more room for disagreement and more complexity in auditing. Some GAAP rules are simpler because they are bright-line.

Mistake 2: Treating IFRS as a single standard. IFRS is a suite of 40+ standards and interpretations. A company might follow IFRS generally but apply different accounting policies within it. Always read the accounting policy footnote.

Mistake 3: Not adjusting for revaluation. If you are comparing a GAAP company's book value per share to an IFRS company's, remember that the IFRS company's equity includes revaluation adjustments. The numbers are not comparable without adjustment.

Mistake 4: Ignoring the LIFO/FIFO difference. This is material for companies in certain industries (retail, oil & gas). Always check inventory accounting method when comparing US and international peers.

Mistake 5: Assuming convergence is complete. GAAP and IFRS continue to align, but they are not identical. Major differences remain, and assuming they are the same will lead to misinterpretation.

FAQ​

Q: If I own shares in a European company, which standard applies?
A: If it is listed on a regulated market in the EU, it must use IFRS. If it also lists in the US (American Depositary Receipts, or ADRs), it will file using IFRS with the SEC (not GAAP).

Q: Can a company use IFRS for the US market and GAAP elsewhere?
A: No, not typically. If a company is a US public company (listed on NYSE, NASDAQ), it must use GAAP for SEC filings. A foreign company can use IFRS when filing with the SEC, but a US company cannot.

Q: Which is more conservative: GAAP or IFRS?
A: Neither is universally more conservative. GAAP's no-reversal rule is conservative. IFRS's revaluation model can be less conservative. GAAP's detailed rules sometimes produce more conservative results than IFRS's principles-based approach, but context matters.

Q: Does IFRS prevent fraud better than GAAP?
A: No. Fraud is fraud under either standard. A company can manipulate revenue recognition, hide liabilities, and fabricate assets under IFRS just as under GAAP. Standards do not prevent fraud; auditor skepticism and governance do.

Q: Will the US ever adopt IFRS?
A: It is unlikely in the near term. The SEC has been studying this for years. A transition would be expensive and would require congressional action. Convergence (aligning standards) is more likely than full adoption.

Q: How do I compare a GAAP company to an IFRS company?
A: Read the accounting policy footnotes carefully. Note differences in inventory, assets, impairment, and revenue recognition. Adjust for material differences (e.g., if one uses LIFO, recalculate COGS and inventory for the other). Consider whether revaluation has been used. Be cautious about ratios (ROA, ROE) that depend on asset values.

Summary​

IFRS is a principles-based accounting framework used by 140+ countries and thousands of companies worldwide. Maintained by the IASB, IFRS emphasizes professional judgment and the economic substance of transactions. Major differences from GAAP include the prohibition of LIFO, allowance of fixed-asset revaluation, and permission for impairment reversals. While the FASB and IASB have converged standards in recent years (notably revenue and leases), significant differences persist. For investors comparing companies across GAAP and IFRS territories, understanding these differences and adjusting for them is essential to avoid misleading conclusions about profitability and financial position.

Next​

GAAP vs IFRS: the big-picture differences

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