IFRS vs GAAP
IFRS (International Financial Reporting Standards) and GAAP (Generally Accepted Accounting Principles) are the two dominant accounting frameworks globally, with GAAP required for US public companies and IFRS used in over 140 countries, differing meaningfully in inventory accounting, lease classification, revenue recognition, and financial instrument treatment.
GAAP is the rules-based accounting framework developed and maintained by the Financial Accounting Standards Board (FASB) and required by the SEC for all US public companies. IFRS is the principles-based framework issued by the International Accounting Standards Board (IASB) and is mandatory or permitted in most of the rest of the world, including the European Union, UK, Canada, Australia, and most emerging markets.
The philosophical difference between the two systems runs deep. GAAP tends to be prescriptive and rule-dense, providing detailed guidance for specific transactions and industries. When a situation is covered by GAAP, companies have relatively little interpretive flexibility. IFRS, by contrast, provides broader principles and requires management to use judgment to determine the accounting treatment most faithfully representing economic substance. This creates more comparability across industries under GAAP and more judgment-based flexibility under IFRS.
Several specific differences are particularly significant for financial analysts. Under GAAP, companies may use LIFO (Last In, First Out) inventory accounting, which during periods of rising prices produces lower reported earnings and lower taxes by matching higher recent costs against revenue. IFRS prohibits LIFO entirely, requiring FIFO or weighted average. This means US companies using LIFO will show lower gross margins than IFRS-reporting counterparts, all else equal, and their LIFO reserves must be added back when comparing across systems.
Revenue recognition rules converged significantly with the joint FASB-IASB project producing ASC 606 (GAAP) and IFRS 15, which took effect for most companies in 2018. Both frameworks now use a five-step model based on identifying performance obligations and recognizing revenue as those obligations are satisfied. Remaining differences are mostly in scope and specific industry applications.
Lease accounting differs as well. Both GAAP (ASC 842) and IFRS (IFRS 16) now require operating leases to appear on the balance sheet, eliminating the prior off-balance-sheet treatment. However, IFRS 16 treats virtually all leases as finance leases from the lessee perspective (with separate interest and depreciation components), while ASC 842 maintains a distinction between operating and finance leases, with operating leases showing a single straight-line lease cost. This creates EBITDA differences between otherwise comparable US and international companies.
For cross-border investment analysis, understanding the GAAP-IFRS differences is essential when comparing valuation multiples. A US company's reported EBITDA may not be directly comparable to a European peer's without adjustments for inventory method, lease classification, and other divergences.