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L.5 · INTERMEDIATE · 2 MIN

US GAAP vs. IFRS: Key Differences That Move Numbers

Most public companies outside the U.S. report under IFRS, while U.S. companies use GAAP. The two frameworks share conceptual foundations but diverge on rules that can materially change reported figures — making cross-border comparisons treacherous without adjustment.

Quiz · 5 questions ↓
§ 01
TopicU.S. GAAPIFRS
Inventory (LIFO)AllowedProhibited
R&D CostsNearly all expensed immediatelyDevelopment costs capitalized once 6 criteria met
Impairment ReversalsProhibited (one-way door)Allowed for long-lived assets (not goodwill)
LeasesOperating vs finance distinctionVirtually all finance leases (IFRS 16)
Credit LossesCECL — lifetime expected at originationIFRS 9 — 3-stage model, less front-loaded
RevenueASC 606 (5-step)IFRS 15 (5-step, substantially converged)
§ 02

The three highest-impact differences: LIFO prohibition (inflates IFRS inventory/income), R&D capitalization (deflates IFRS expenses), and impairment reversal rules (IFRS can write values back up).

§ 03
Pick a U.S. company and a non-U.S. peer in the same industry. In **Fundamentals**, compare R&D as a % of revenue and intangible asset balances.
§ 04
A U.S. semiconductor company (GAAP, LIFO) shows lower inventory and higher COGS than a Taiwanese peer (IFRS). Both have identical operations. Why?
§ 05

Before comparing a GAAP company to an IFRS peer, adjust for LIFO/FIFO differences and check for capitalized development costs. Without these adjustments, you’re comparing accounting methods, not businesses.

§ 06
A company reports under both GAAP and IFRS. Revenue: GAAP $1B, IFRS $1.05B. Why might this happen?
Five questions · AI feedback

Sit with the ideas.

You are comparing a U.S. semiconductor company (GAAP, uses LIFO) to a Taiwanese competitor (IFRS). The U.S. company has lower reported inventory, higher COGS, and lower net income. Both companies have nearly identical operations and pricing. What adjustments should you make for a fair comparison?

Why:
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