GAAP vs IFRS Differences You Need to Know for the CPA Exam

The CPA exam tests your knowledge of both U.S. GAAP and IFRS, and questions about the differences between the two frameworks appear regularly on the FAR section. The good news is that the exam focuses on a relatively narrow set of high-profile differences rather than requiring encyclopedic knowledge of every IFRS standard. If you know the key areas where the frameworks diverge, you can handle these questions efficiently and pick up points that many candidates leave on the table.

This guide covers the most frequently tested GAAP vs. IFRS differences, explains why they matter, and provides a practical framework for approaching comparison questions on exam day.

The Big Picture: Rules-Based vs. Principles-Based

The most fundamental difference between GAAP and IFRS is philosophical. U.S. GAAP is often described as rules-based, meaning it provides detailed, specific guidance for a wide range of transactions. IFRS is considered principles-based, providing broader standards that require more professional judgment in application. This distinction underlies many of the specific differences you will encounter.

On the exam, you will not be asked to debate which approach is better. Instead, you need to know the practical consequences: IFRS tends to have fewer bright-line tests, more room for judgment, and in some cases permits accounting treatments that GAAP does not allow.

Inventory Differences

Inventory is one of the most commonly tested areas for GAAP vs. IFRS comparison.

LIFO: GAAP permits LIFO; IFRS prohibits it. This is one of the most frequently tested differences on the exam.
Inventory write-downs: Under GAAP, inventory write-downs are permanent for companies using LIFO or retail methods (lower of cost or market). Under IFRS, all inventory write-downs can be reversed if the value subsequently recovers, up to the original cost.
Cost formulas: Both frameworks permit FIFO and weighted average. GAAP also permits LIFO and specific identification. IFRS permits FIFO, weighted average, and specific identification but not LIFO.

Revenue Recognition

Revenue recognition has largely converged between GAAP (ASC 606) and IFRS (IFRS 15). Both use the same five-step model for recognizing revenue from contracts with customers. However, some differences remain in application guidance:

GAAP provides more detailed implementation guidance, including industry-specific guidance that IFRS does not have.
The treatment of licensing arrangements has some differences in how the frameworks define functional vs. symbolic intellectual property.
Presentation differences exist for contract assets and contract liabilities on the balance sheet.

For the CPA exam, the key takeaway is that the core revenue model is the same, but GAAP tends to provide more prescriptive rules for edge cases.

Lease Accounting

Lease accounting saw major changes under both ASC 842 (GAAP) and IFRS 16, but the two standards took different approaches.

Lessee accounting under GAAP: ASC 842 requires lessees to classify leases as either finance leases or operating leases. Both types go on the balance sheet, but they produce different income statement patterns. Finance leases have front-loaded expense through separate interest and amortization; operating leases have straight-line total expense.
Lessee accounting under IFRS: IFRS 16 essentially treats all leases as finance leases for the lessee. There is a single model with no operating lease classification. This produces front-loaded expense for almost all leases under IFRS.
Lessor accounting: Both frameworks maintain the operating vs. finance lease distinction for lessors. The lessor models are broadly similar.

Exam tip: The exam frequently tests the lessee classification difference. Remember that IFRS has one model (finance-type) while GAAP has two (finance and operating).

Property, Plant, and Equipment

Several differences exist for long-lived tangible assets:

Revaluation: IFRS permits the revaluation model, where PP&E can be reported at fair value with changes going to a revaluation surplus in other comprehensive income. GAAP only permits the cost model, so PP&E is always reported at historical cost less accumulated depreciation and impairment.
Component depreciation: IFRS requires component depreciation, where significant parts of an asset with different useful lives are depreciated separately. GAAP permits but does not require component depreciation.
Impairment: GAAP uses a two-step approach with an undiscounted cash flow recoverability test followed by a fair value measurement. IFRS uses a one-step approach comparing carrying amount to recoverable amount (the higher of fair value less costs to sell and value in use). Notably, IFRS allows impairment reversals for assets other than goodwill; GAAP does not.

Financial Statement Presentation

The way financial information is presented on the face of the financial statements differs between the two frameworks.

Balance sheet: GAAP typically lists assets in order of liquidity (most liquid first). IFRS often lists assets in reverse liquidity order (least liquid first), though this is not strictly required.
Income statement: GAAP requires a single-step or multi-step income statement format. IFRS does not prescribe a specific format but requires certain minimum line items. IFRS also prohibits the classification of items as extraordinary, while GAAP eliminated extraordinary items with ASU 2015-01.
Statement of changes in equity: IFRS requires a separate statement of changes in equity. Under GAAP, this information can be presented in the notes or as a separate statement.

Intangible Assets and Goodwill

Development costs: IFRS requires capitalization of development costs when specific criteria are met (technical feasibility, intent to complete, ability to use or sell, etc.). GAAP generally expenses research and development costs as incurred, with the notable exception of software development costs under ASC 985 and ASC 350-40.
Goodwill impairment: GAAP uses a quantitative impairment test comparing the fair value of the reporting unit to its carrying amount. IFRS tests goodwill at the cash-generating unit level and can reverse impairments of CGUs but not goodwill specifically.

Other Notable Differences

Contingencies: GAAP uses the terms "probable, reasonably possible, and remote" for loss contingencies. IFRS uses "probable, possible, and remote" but defines probable as "more likely than not" (greater than 50%), while GAAP's probable is generally interpreted as a higher threshold (around 75-80%).
Borrowing costs: Both frameworks require capitalization of borrowing costs for qualifying assets, so this area has largely converged.
Investment property: IFRS has a separate category for investment property with the option to use fair value measurement. GAAP has no separate investment property category.

How GAAP vs. IFRS Is Tested on the Exam

The CPA exam typically presents GAAP vs. IFRS questions in two ways. The first is a direct comparison: "Under IFRS, how would this transaction be treated differently than under GAAP?" The second is an application question set in an IFRS context: "An entity reporting under IFRS should record this transaction as..." Both formats reward the same knowledge, so focus on understanding the specific differences rather than memorizing abstract rules.

The highest-yield differences to memorize are:

LIFO is prohibited under IFRS.
IFRS allows revaluation of PP&E and intangible assets; GAAP does not.
IFRS allows reversal of impairment losses (except goodwill); GAAP does not.
IFRS has one lease model for lessees; GAAP has two.
IFRS requires capitalization of development costs when criteria are met; GAAP expenses them.

Think CPA Makes GAAP vs. IFRS Manageable

Keeping GAAP and IFRS differences straight requires focused review and practice. Think CPA organizes these differences by topic so you can study them in context rather than trying to memorize a disconnected list. With targeted practice questions that mirror how the CPA exam actually tests these comparisons, you can build the recall you need without the overwhelm.

Final Thoughts

GAAP vs. IFRS questions are predictable points on the CPA exam. The exam returns to the same core differences repeatedly, so a targeted review of inventory, leases, PP&E, impairment, and development costs will cover the vast majority of what you will see. Learn the differences in context, practice applying them, and these questions will become some of your easiest on exam day.