What Is IFRS?
International Financial Reporting Standards are the accounting rules written by the International Accounting Standards Board, a London-based standard setter. The framework dictates how companies recognize revenue, measure assets and liabilities, account for leases, and present their financial statements. The European Union mandated IFRS for listed companies starting in 2005, and adoption spread from there until it became the dominant reporting language outside the United States.
IFRS is generally described as principles-based, meaning it sets out broad objectives and asks preparers to apply judgment, whereas US GAAP historically leans on detailed, industry-specific rules. In practice the two systems have converged on major topics such as revenue recognition, but meaningful gaps remain, and the SEC still requires US domestic companies to report under GAAP rather than IFRS.
How IFRS Differs from US GAAP
Several differences show up constantly in analysis. IFRS prohibits LIFO inventory costing, which US GAAP allows, so a US industrial using LIFO can show different margins than an IFRS peer holding identical inventory. IFRS also permits capitalizing certain development costs once technical and commercial feasibility is demonstrated, while US GAAP expenses nearly all research and development immediately. Companies reporting under IFRS may even revalue property upward, an option GAAP does not offer.
Impairment mechanics diverge as well: IFRS allows some impairment losses to be reversed in later periods, while US GAAP treats most write-downs as permanent. Foreign private issuers listed in the US have been allowed since 2007 to file IFRS financial statements without reconciling back to GAAP, so analysts covering cross-listed names work with both frameworks side by side.
Why IFRS Matters for Analysts
Cross-border comparable company analysis is where the framework question bites hardest. If you are valuing a US retailer against European peers, differences in inventory costing and development cost capitalization can distort EBITDA and asset values before you have made a single judgment call. Good analysts adjust for the largest gaps or at least flag them when building comps.
In cross-border M&A, quality of earnings work often includes translating a target's IFRS results into the acquirer's GAAP view, and purchase agreements may specify which standard governs working capital calculations. For interviews, being able to name two or three concrete GAAP versus IFRS differences, such as the LIFO ban or development cost capitalization, signals genuine accounting fluency.
