IFRS Vs US GAAP – Key Differences, Similarities & Examples

What Are IFRS and US GAAP?

Every company that reports to investors needs a common rulebook, so that a profit figure in one company means roughly the same thing as a profit figure in another. Two rulebooks dominate global finance.

Who Uses IFRS and Who Uses US GAAP?

The IFRS Foundation tracks how its standards are applied in each country and has published complete profiles for around 169 jurisdictions. Among those profiled, the large majority require IFRS for most or all publicly accountable companies, and a smaller group permits it. The United States is the most prominent exception. The profiles are updated over time, so check the IFRS Foundation page for the latest count.

US domestic companies listed with the SEC must report under US GAAP. Foreign private issuers listing in the US, however, may file financial statements prepared under IFRS as issued by the IASB without reconciling them to US GAAP, a rule the SEC introduced in 2007. This is why many European, Asian and Latin American companies list on US exchanges while keeping their IFRS books.

IFRS vs US GAAP – Principles vs Rules

The most quoted difference between the two systems is their style. IFRS sets out objectives and principles, then expects preparers and auditors to apply judgment to the facts. US GAAP tends to add detailed rules, bright-line thresholds and industry-specific exceptions.

What a principles-based approach means

Under IFRS, you ask whether the accounting reflects the economic substance of a transaction. The result can vary slightly between companies, yet the reasoning must be explained in the notes.

What a rules-based approach means

Under US GAAP, you often look for the specific paragraph or threshold that covers your situation. This produces more consistency and a clearer audit trail, but also a much larger body of guidance.

IFRS vs US GAAP Comparison Table

Use this table as a quick reference. Each major area is explained in more detail in the sections that follow.

Inventory – LIFO and Write-Down Reversals

Inventory is one of the clearest places where the two frameworks part ways, and it directly changes reported profit.

LIFO is not allowed under IFRS

Last-in, first-out costing is permitted under US GAAP and is popular with US companies in periods of rising prices because it lowers taxable income. IAS 2 prohibits it, so IFRS reporters choose between first-in, first-out (FIFO) and weighted-average cost.

Reversing inventory write-downs

If inventory is written down to a lower value, IFRS requires the write-down to be reversed when the value later recovers, but never above the original cost. US GAAP treats the written-down amount as the new cost basis, so there is no reversal.

Fixed Assets and Intangibles

Revaluation of property, plant and equipment

IAS 16 lets a company choose between carrying an asset class at cost less depreciation or at revalued fair value, with regular updates. Revaluation gains generally go to other comprehensive income. US GAAP does not allow upward revaluation of most fixed assets, which keeps balance sheets anchored to historical cost.

Research and development

IFRS separates research from development. Research is expensed, while development spending is capitalised once a company can show, for instance, technical feasibility, intent and ability to complete the asset, and probable future economic benefits. US GAAP expenses most research and development as incurred, with limited exceptions such as certain software costs. As a result, innovative IFRS reporters can show higher intangible assets and earlier profit than similar US GAAP reporters.

Component depreciation

IFRS requires each significant part of an asset with a different useful life, such as an aircraft engine versus the airframe, to be depreciated separately. US GAAP permits it but does not require it.

Impairment of Assets

Both frameworks require companies to write assets down when they are no longer worth their carrying amount. The method and the aftermath differ. The comparison below focuses on long-lived assets and goodwill; inventory, financial assets and other categories follow their own impairment models, and US GAAP requirements vary by asset type.

The practical effect: US GAAP can delay recognising an impairment because undiscounted cash flows set a lower bar, but once recognised, the loss is permanent. IFRS may recognise impairments sooner and gives credit if conditions improve.

Leases – IFRS 16 vs ASC 842

Both frameworks now bring most leases onto the balance sheet as a right-of-use asset and a lease liability. The income statement is where they diverge.

IFRS 16 – one model for lessees

Almost every lease is treated like a financed purchase. The lessee records depreciation on the asset and interest on the liability, so total expense is higher early in the lease and lower later. EBITDA improves because rent no longer appears as an operating cost.

ASC 842 – finance and operating leases

US GAAP keeps two lessee classifications. Finance leases look like the IFRS 16 pattern. Operating leases record a single straight-line lease cost within operating expenses, so the profit and loss effect resembles traditional rent.

Financial Instruments and Credit Losses

Classification

IFRS 9 classifies debt instruments using the company’s business model and the contractual cash-flow characteristics of the instrument. US GAAP uses a more instrument-by-instrument approach, and equity investments with readily determinable fair values generally go through profit or loss.

Expected credit losses

Under IFRS 9, a loss allowance starts at 12-month expected losses and moves to lifetime expected losses when credit risk rises significantly (the three-stage model). Under US GAAP, the CECL model in ASC 326 requires lifetime expected losses to be recognised from day one on most financial assets carried at amortised cost. For long-dated loans, CECL tends to produce larger allowances at origination.

Presentation, Cash Flows and IFRS 18

Cash flow statement classification

Under IAS 7 today, IFRS gives policy choices: interest paid can sit in operating or financing activities, interest and dividends received in operating or investing, and dividends paid in operating or financing. US GAAP is more prescriptive: interest paid, interest received and dividends received are operating cash flows, and dividends paid are financing. IFRS 18 changes the IFRS side from 2027, as explained below.

IFRS 18 changes the income statement

IFRS 18, Presentation and Disclosure in Financial Statements, was published by the IASB in April 2024 and replaces IAS 1. It applies to annual reporting periods beginning on or after 1 January 2027, with earlier application permitted and restated comparatives required. It is the largest change to how IFRS companies present performance in more than two decades.

• Defined categories and subtotals. Income and expenses are grouped into operating, investing and financing categories, with a defined operating profit subtotal.
• Management-defined performance measures. Company-specific metrics such as adjusted profit or adjusted EBITDA must be disclosed in the notes and reconciled to the nearest IFRS subtotal, with an explanation of why they are useful.
• Better grouping. Tighter rules on aggregation, disaggregation and labelling aim to stop vague “other” lines from hiding important information.
• Cash flow statement amendments. IFRS 18 amends IAS 7 so the indirect method starts from operating profit rather than profit after tax, and removes most of the interest and dividend classification options. For most entities, interest and dividends paid become financing and interest and dividends received become investing. Entities with specified main business activities, such as banks, follow the income statement category of the related item. Check local endorsement and the effective date that applies to you.

IFRS 18 changes presentation and disclosure rather than how profit is measured. It does, however, widen the presentation gap with US GAAP, which has no equivalent defined subtotals.

1. April 2024 IASB publishes IFRS 18 to replace IAS 1.
2. Preparation period Companies assess impact, update systems and plan comparatives. Local endorsement proceeds in jurisdictions that require it.
3. 1 January 2027 Mandatory effective date for annual periods beginning on or after this date, including related interim reporting.

IFRS and US GAAP Convergence

In 2002 the FASB and IASB agreed to work toward a single set of high-quality standards, and the boards later issued joint projects on revenue, business combinations and fair value measurement. That effort delivered real alignment, particularly in revenue recognition (IFRS 15 and ASC 606), but major projects on leases and financial instruments ended with different answers.

In the United States, the SEC has so far chosen to accept IFRS from foreign filers rather than require it for domestic companies. Today the boards work largely independently, and full convergence is no longer an active goal. The practical expectation is coexistence: two respected frameworks, a shrinking list of differences in some areas, and growing differences in others.

IFRS vs US GAAP – Which One Applies to Your Business?

For investors, the best habit is to read the accounting policy notes before comparing two companies. For finance teams, the best habit is to maintain a short bridge schedule that quantifies the big differences, typically inventory, leases, development costs and impairments.