Accounting standards are the rules that dictate how companies record and report financial transactions. In the United States, the Financial Accounting Standards Board (FASB) writes those rules under a framework called Generally Accepted Accounting Principles (GAAP). Most of the rest of the world follows International Financial Reporting Standards (IFRS), issued by the International Accounting Standards Board (IASB). Both standard-setters are private and independent, but their rules carry legal force because government regulators formally adopt them. The result is a common financial language that lets investors compare companies, lenders assess risk, and markets allocate capital without guessing what the numbers mean.
Who Writes the Rules
Two private-sector organizations do the heavy lifting. The FASB has served as the designated US accounting standard-setter since 1973. It is an independent, not-for-profit body based in Norwalk, Connecticut, and its rules bind public companies, private companies, and nonprofits reporting under GAAP.1Financial Accounting Standards Board. About the Financial Accounting Standards Board
The IASB develops IFRS from its London headquarters.2IFRS Foundation. Contact Us IFRS is required for all domestic listed companies in roughly 98 jurisdictions and is permitted or partially required in dozens more.3IFRS Foundation. Use of IFRS Accounting Standards by Jurisdiction The European Union, Canada, Australia, and most of South America and Africa all fall under it.
Neither board has enforcement power on its own. In the United States, the Securities and Exchange Commission (SEC) holds the statutory authority to establish accounting principles for public companies under Section 108 of the Sarbanes-Oxley Act.4Office of the Law Revision Counsel. 15 US Code 7218 – Accounting Standards Rather than writing the rules itself, the SEC recognizes FASB standards as “generally accepted” for federal securities law purposes, effectively delegating the job while keeping the right to override any standard it disagrees with.5Securities and Exchange Commission. Policy Statement – Reaffirming the Status of the FASB as a Designated Private-Sector Standard Setter Foreign regulators adopt IFRS through their own legal mechanisms.
How a New Standard Gets Made
A new accounting standard does not appear overnight. The FASB identifies a reporting issue, staff analyze it, the board votes on whether to add it to the technical agenda, then deliberates in public meetings and issues an Exposure Draft.6Financial Accounting Standards Board. Standard-Setting Process Anyone can submit a comment letter during the public comment period.7Financial Accounting Standards Board. Documents Open for Comment After digesting the feedback, the board redeliberates and issues a final Accounting Standards Update. The guiding principle throughout is that the expected benefits of the change should justify the costs of implementing it.
What GAAP Requires
GAAP is the authoritative framework for financial reporting in the United States, covering public companies, private companies, and nonprofits. Its hallmark is specificity. GAAP is often called a rules-based system because it provides detailed guidance with explicit criteria and numerical thresholds for a wide range of transactions. The idea is that clear bright lines reduce ambiguity, limit the room for creative accounting, and make it easier for auditors to verify whether a company followed the rules.
Several foundational principles run through the whole framework. The historical cost principle requires assets to be recorded at their original purchase price rather than at a subjective estimate of current market value. The matching principle says expenses should land on the income statement in the same period as the revenues they helped produce. These two ideas shape nearly every line item on a financial statement.
Revenue Recognition Under ASC 606
Revenue recognition used to be governed by a patchwork of industry-specific rules, which made it difficult to compare companies across sectors. FASB unified this area through ASC 606, which established a single five-step model: identify the contract with a customer, identify the performance obligations, determine the transaction price, allocate that price to each obligation, and recognize revenue when each obligation is satisfied. This framework applies to virtually every industry and was converged with its IFRS counterpart (IFRS 15), making revenue recognition one of the rare areas where US and international rules are functionally identical.
Lease Classification
Lease accounting under ASC 842 shows how prescriptive GAAP can get. To classify a lease as a finance lease (similar to a purchase) versus an operating lease (more like a rental), preparers apply quantitative tests. A common approach treats the lease as a finance lease if its term covers 75 percent or more of the asset’s remaining economic life, or if the present value of the lease payments equals or exceeds 90 percent of the asset’s fair value. The standard doesn’t technically mandate these bright lines, but the FASB has acknowledged them as reasonable benchmarks, and in practice they dominate how leases get classified.
Materiality
Not every accounting error triggers a restatement. GAAP relies on materiality to decide when something matters enough to affect the financial statements. The FASB follows the US Supreme Court’s definition: information is material if a reasonable investor would view it as significantly altering the total mix of information available. The FASB has declined to set a uniform quantitative threshold. There is no magic 5 percent rule. Companies evaluate both the size and the nature of a misstatement in the context of the full financial picture.
What IFRS Requires
IFRS takes a fundamentally different approach. Where GAAP prescribes detailed rules, IFRS focuses on broad principles and expects the person preparing the financial statements to exercise professional judgment when applying them to specific facts. The benefit is that preparers can reflect the economic substance of a transaction instead of forcing it into a rigid classification. The trade-off is that two companies facing similar situations might report them differently because their accountants exercised that judgment differently.
This principles-based design is deliberate. The IASB built IFRS to serve a global audience spanning legal systems, business cultures, and levels of market development. A single, highly prescriptive rulebook would be unworkable across that range. The result gives preparers more latitude and puts more pressure on auditors to evaluate whether the choices made are reasonable.
Where GAAP and IFRS Diverge
The philosophical divide between rules-based and principles-based accounting produces real, measurable differences in how companies report their finances.
Property Valuation
Under IFRS, companies can choose a revaluation model for property, plant, and equipment, carrying those assets at fair value with periodic adjustments rather than at historical cost minus depreciation.8IFRS Foundation. International Accounting Standard 16 – Property, Plant and Equipment GAAP generally prohibits upward revaluation. Once you record an asset at cost, it stays at cost (minus depreciation) unless it becomes impaired. Two identical factories owned by a GAAP company and an IFRS company can appear on their balance sheets at drastically different values.
Inventory Methods
GAAP allows the Last-In, First-Out (LIFO) method, which assumes the most recently purchased goods are sold first. In periods of rising costs, LIFO produces higher cost-of-goods-sold and lower taxable income, which is why many US companies favor it. IFRS flatly prohibits LIFO, limiting companies to First-In, First-Out (FIFO) or the weighted-average cost method. This is one of the biggest practical obstacles for a US company that might otherwise adopt IFRS: switching off LIFO can create a significant, one-time tax hit.
Research and Development Costs
Under GAAP, research and development costs are generally expensed as incurred.9Internal Revenue Service. FAQs – IRC 41 QREs and ASC 730 LBI Directive The money spent hits the income statement immediately. IFRS draws a line between research (also expensed) and development. Once a project meets specific feasibility criteria, IFRS requires development spending to be capitalized as an intangible asset and amortized over its useful life.10IFRS Foundation. IAS 38 Intangible Assets An IFRS company deep in the development phase of a new product might report higher earnings than an identical GAAP company simply because of when the costs hit the income statement.
Where Convergence Stopped
For years the FASB and IASB ran a joint convergence project aimed at narrowing these gaps. That effort produced several aligned standards, including revenue recognition (ASC 606 and IFRS 15), business combinations, fair value measurement, and consolidation. But the boards could not agree on financial instruments, leases, or insurance contracts, and the formal joint project has ended with no new topics planned. The remaining differences are now essentially permanent unless one board independently decides to revisit an area.
Simplified GAAP for Private Companies
Public companies have no choice about GAAP. Private companies technically follow GAAP too, but the FASB recognized that some of its rules impose costs on smaller businesses that their financial statement users don’t really need. In 2012 the FASB created the Private Company Council (PCC) to develop targeted simplifications within GAAP for private entities.
The most significant alternative involves goodwill. Public companies carry goodwill on their balance sheets indefinitely and test it for impairment at least annually, a process that can involve expensive valuations. Under the private company alternative, a company can instead amortize goodwill on a straight-line basis over 10 years or less, and only test for impairment when a triggering event occurs, such as deteriorating cash flows or a major market shift. Other PCC alternatives simplify hedge accounting for common interest rate swaps, allow certain intangible assets to be folded into goodwill in a business combination, and exempt common-control leasing arrangements from complex consolidation analysis. These elections are permanent and available at any time.
What Happens When Companies Get It Wrong
Accounting standards without teeth would be suggestions, not rules. In the United States, enforcement works on multiple levels.
Personal Liability for Executives
The Sarbanes-Oxley Act requires the CEO and CFO of every public company to personally certify that the financial statements fairly present the company’s financial condition. Under Section 906, an officer who knowingly certifies a false statement faces up to $1 million in fines and 10 years in prison. If the false certification is willful, the maximum jumps to $5 million and 20 years.11GovInfo. Sarbanes-Oxley Act of 2002 This personal criminal exposure is what transformed financial reporting from a back-office accounting function into a boardroom priority.
Restatements and Clawbacks
When a company discovers its previously issued financial statements contained material errors, it must restate them. A “Big R” restatement (one that makes the original filing unreliable) triggers an immediate Form 8-K disclosure and requires the company to amend its prior filings. Even a smaller “little r” correction must be addressed the next time the company files the affected financial statements.12Securities and Exchange Commission. Final Rule – Listing Standards for Recovery of Erroneously Awarded Compensation
Beyond the restatement itself, SEC Rule 10D-1 now requires every listed company to maintain a compensation clawback policy. If a restatement shows that executives received incentive-based compensation they would not have earned under the corrected numbers, the company must recover the excess, covering any payments made during the three years before the restatement.12Securities and Exchange Commission. Final Rule – Listing Standards for Recovery of Erroneously Awarded Compensation Companies that fail to enforce their clawback policy risk delisting from their exchange. Income tax accounting issues have historically ranked among the leading causes of restatements, which is why auditors scrutinize tax provisions so closely.
Sustainability Reporting
Financial accounting traditionally focuses on dollars and cents, but a parallel set of standards is emerging around sustainability and climate risk. In June 2023 the International Sustainability Standards Board (ISSB), a sister body to the IASB, issued its first two standards: IFRS S1 on general sustainability-related disclosures and IFRS S2 on climate-specific disclosures. Both draw on the recommendations of the Task Force on Climate-related Financial Disclosures (TCFD).13IFRS Foundation. Introduction to the ISSB and IFRS Sustainability Disclosure Standards
Adoption is moving quickly. As of late 2025, jurisdictions across the Americas, Asia-Oceania, and Europe, the Middle East, and Africa have publicly committed to using the ISSB standards, including Brazil, Canada, Australia, Japan, the United Kingdom, and the EU. In the United States the picture is more complicated. The SEC finalized its own climate disclosure rule in March 2024 but stayed the rule pending legal challenges and ultimately voted in 2025 to withdraw its defense of the regulation.14Securities and Exchange Commission. SEC Votes to End Defense of Climate Disclosure Rules For now, US public companies face no federal mandate for standardized sustainability reporting, though many disclose voluntarily and some face state-level requirements.