If you run a US accounting firm, GAAP vs IFRS comes up more in hiring and client questions than in your own filings. The two are the rulebooks companies report their finances under: US GAAP, used by US companies, and IFRS, the international standard required in more than 140 jurisdictions (IFRS Foundation). For most US practices, your work runs on US GAAP, and IFRS matters mainly at the edges.
What is GAAP?
GAAP, or Generally Accepted Accounting Principles, is the common set of accounting rules US companies follow when they prepare financial statements (Investor.gov). It is set by the Financial Accounting Standards Board (FASB) and organized in the FASB Accounting Standards Codification. Public companies that file with the Securities and Exchange Commission report under US GAAP, and most private US firms and their lenders expect it too.
What is IFRS?
IFRS, or International Financial Reporting Standards, is the global set of accounting standards issued by the International Accounting Standards Board (IASB), the standard-setter inside the IFRS Foundation (IFRS Foundation). More than 140 jurisdictions require IFRS for public companies, including the European Union, the United Kingdom, Canada, and Australia (IFRS Foundation). The United States is the major economy that has not adopted it for domestic filers.
Is GAAP vs IFRS a matter of rules or principles?
A widely cited difference between GAAP and IFRS is style: US GAAP is often described as more rules-based, while IFRS is more principles-based (Thomson Reuters). Rules-based means detailed, specific guidance for particular transactions; principles-based means broader principles that leave more room for professional judgment. In practice the line is blurry, and both frameworks mix rules and judgment, but that reputation shapes how each handles the specific areas below.
Where do GAAP and IFRS actually differ?
The frameworks agree on far more than they disagree on, but a handful of differences show up again and again, mostly in inventory, assets, and costs. The table below summarizes the ones a US firm meets most often, and the sections after it explain each.
| Topic | US GAAP | IFRS |
|---|---|---|
| Underlying style | Rules-based | Principles-based |
| Inventory costing (LIFO) | Permitted | Not permitted |
| Development costs | Expensed as incurred | Capitalized when criteria are met |
| Revaluing assets upward | Not permitted | Optional revaluation model |
| Reversing an impairment (non-goodwill) | Not permitted | Permitted if value recovers |
| Cash-flow classification | Fixed placement | More presentation choice |
How do GAAP and IFRS treat inventory?
Inventory is the classic GAAP versus IFRS difference. US GAAP lets a company value inventory using last-in, first-out (LIFO); IFRS does not allow LIFO and limits companies to first-in, first-out (FIFO) or a weighted-average method (The CPA Journal). For a client that holds real inventory, that single rule can move reported profit and taxable income, so it is worth confirming which method the client uses.
How does each standard recognize revenue?
Revenue recognition used to be a major GAAP versus IFRS gap, and it is now one of the closest-aligned areas. The FASB and the IASB issued a jointly developed revenue standard, so the core model is broadly the same under both frameworks (The CPA Journal). Differences remain in the details, but revenue is a case where the two boards genuinely converged.
Can you revalue assets upward?
Asset revaluation is an area where IFRS offers a choice that US GAAP does not. Under US GAAP, property, plant, and equipment stays on the books at historical cost less depreciation; IFRS lets a company elect a revaluation model and carry those assets at fair value (The CPA Journal). In practice many IFRS reporters keep historical cost anyway, but the option itself is a real structural difference.
Are development costs expensed or capitalized?
Research and development spending is treated differently under the two frameworks. US GAAP has companies expense most development costs as they are incurred; IFRS lets a company capitalize qualifying development costs once a project meets specific criteria (The CPA Journal). The result is that the same project can look like a cost under US GAAP and an asset under IFRS.
How are impairments and write-downs handled?
Impairment is where US GAAP and IFRS part ways on second chances. Under US GAAP, once an asset is written down the reduced amount becomes its new cost basis and is not written back up; IFRS has a company keep watching for a recovery and, for most assets other than goodwill, allows a later reversal (The CPA Journal). For a client with impaired assets, that difference changes how future periods look.
How does financial statement presentation differ?
Presentation is a subtler GAAP versus IFRS difference, but it shows up on the face of the statements. One recurring example is the statement of cash flows: US GAAP fixes where interest and dividends are classified, while IFRS gives companies more choice in how to present them (The CPA Journal). Terminology and the order of the balance sheet can differ too, which matters when you read a foreign parent's numbers.
How do provisions and contingent liabilities differ?
Provisions and contingent liabilities are recognized on different triggers under the two frameworks. US GAAP and IFRS use different thresholds for when a liability is probable enough to record, and US GAAP applies some of its provision guidance to legal obligations in particular (The CPA Journal). The effect is that a liability booked under one framework may sit in the footnotes under the other.
Where do GAAP and IFRS agree?
For all the differences, GAAP and IFRS agree on the fundamentals, and they have grown closer over time. Since 2002 the FASB and the IASB have run a formal convergence effort that narrowed many gaps, most clearly with the jointly developed revenue standard both boards issued in 2014 (The CPA Journal). The two boards also took on lease accounting together and each issued a standard in 2016, but the frameworks still diverge there, so leases remain a lingering difference rather than a full match.
Both frameworks still use accrual accounting, the same core financial statements, and the same goal of a fair, comparable picture of a company's finances. Full convergence stalled after US regulators declined to adopt IFRS for domestic filers, so real differences remain.
Standards evolve, so confirm the current treatment against the frameworks themselves and your firm's advisor before you rely on any single point.
What does GAAP vs IFRS mean for a US accounting firm?
For a US firm, the GAAP versus IFRS debate is mostly settled before it starts. Your public-company clients report under US GAAP, and your private clients and their lenders expect US GAAP or a simpler special-purpose framework (Investor.gov). IFRS shows up only at the edges, for a foreign-owned subsidiary or a client that consolidates into an overseas parent.
The standards-competence worry about offshore staff mostly misses that point. Offshore or onshore, the real question is the same: can this person prepare and review work to the US rulebook and current US tax rules? That skill is trainable and testable, and it is what a firm should actually be checking for.
Accountably places trained offshore accountants and tax preparers inside your firm, ramped on your software and SOPs, and every return passes a layered US review, preparer to senior to quality to final, before it reaches your signature. You sign; we make it signable. Since 2022 we have worked with 20+ US firms across 30+ placements.
If you carry this kind of volume, don't trust us. Test us. Run a Free 40-Hour Proof Pilot with our team: a fixed 40-hour block of your own representative work, prepared on your software and put through our full review, and graded by your own reviewer before a single client file is committed. If a placement is not the right fit in the first 30 days, we replace them free under our 30-Day Fit Guarantee. Start a Proof Pilot on your own files.
Frequently asked questions
Which is better, GAAP or IFRS?
Neither GAAP nor IFRS is objectively better; the right framework depends on where a company reports and to whom (The CPA Journal). A US company reports under US GAAP, while a company in an IFRS jurisdiction reports under IFRS. For a US firm, US GAAP is simply the operative standard.
Why doesn't the United States use IFRS?
The United States has not adopted IFRS for domestic public companies, which still report under US GAAP set by the FASB (The CPA Journal). Regulators studied a move to IFRS and, after a multi-year review, declined to require it. So US GAAP remains the reporting standard for US filers.
Can a US company use IFRS?
A US company can prepare supplemental IFRS statements, but its required US filings still follow US GAAP (Investor.gov). Foreign companies that file with the SEC as foreign private issuers may report under IFRS instead. A domestic US company, though, reports under US GAAP.
Do US private companies have to follow GAAP?
US private companies are not legally required to follow US GAAP the way SEC filers are, but most do because lenders, investors, and sureties ask for GAAP financial statements (Investor.gov). Some smaller firms use a special-purpose framework, such as tax-basis or cash-basis reporting, when GAAP is not demanded. The choice usually comes down to what the company's stakeholders require.