Accounting principles simplified

Everyone recognizes that accounting is a numbers-driven profession: accountants dedicate countless hours a week analyzing financial data, tracking every dollar of expenses and income, and ensuring accurate reporting of a business’s or individual client’s financial health. The industry is also characterized by precise accounting principles, specialized terminology, and universally accepted standards.

Without these standardized concepts, accountants would lack an objective framework to consistently measure:

• A company’s or an individual’s tax liability
• The effect of outstanding loans and interest on net value
• Transaction types, categorized according to established reporting and accounting measures

Accountants invest years mastering rules and responsibilities in practice, memorizing key terms for certification exams, and understanding how to properly record expenses, calculate taxes, and apply agreed-upon accounting standards. Below, we’ve outlined core accounting terms, principles, and methodologies to provide you with a solid introduction to core accounting fundamentals before you dive deeper into your study materials or career path.

Basic accounting terminology

Below are the key definitions and terms you’ll hear in the accounting world constantly. Keep in mind that the examples and definitions below mostly apply to management or corporate accounting, though there are important takeaways for CPAs and tax officials who work with individual clients as well.

Accrual method of accounting

The guiding methodology for properly recording and reporting revenues and expenses on income statements and assets and liabilities on balance sheets.

Revenues are reported when they have been earned, which also adds a related asset to the company’s balance sheet (e.g., cash or accounts receivable).

Expenses are recorded when incurred, further emphasizing that financial statements are complete and accurate under the accrual method.

Amortization

Refers to the systematic allocation of the cost of an intangible asset (such as a patent or trademark) over its useful life.

Assets, liabilities, and equity

The core components of a balance sheet are assets, which are future benefits a company owns or will receive, and liabilities, which are what a company owes (such as debt and taxes).

Equity represents the residual interest in a company's assets after deducting all liabilities. It includes retained earnings and shareholder contributions. Double-entry bookkeeping ensures that both sides of the equation balance.

In short: Equity = Assets - Liabilities

Cash flow

The movement of money into and out of a company over a certain period of time. If outflows exceed inflows, then a company has a net negative cash flow.

Depreciation

The decrease in the value of an asset, often used to refer to physical capital like factory equipment, property, technology, or vehicles.

Expenses

A cost a company incurs to generate revenue, categorized as an operating cost (required for the direct function of a business) or nonoperating expenses (interest charges and other costs related to loans and borrowing).

Financial statements

Written records that convey business activities and financial performance. These can include:

• Statement of financial position
• Statement of profit or loss and other comprehensive income (OCI)
• Statement of changes in equity
• Statement of cash flows
• Notes to the financial statements

While financial tracking occurs throughout the year, statements are usually released quarterly and/or annually. Publicly traded companies are required to file their statements with the Securities and Exchange Commission (SEC) and make them publicly available.

Interest

The cost of borrowing money, expressed as a percentage rate over a given period. Interest rates may be fixed (stay the same year over year) or variable (fluctuating, often tied to the federal funds rate and market conditions).

Net income

The bottom-line profit of a business is the profit remaining after all expenses, taxes, and costs are deducted from total revenue. It is calculated as total revenue minus total expenses; if a company’s net income is negative, it means it lost money during the period.

Revenue

Gross earnings of a company are based on sales and core operations before taking out taxes, expenses, labor costs, and other expenses, also known as the “top line.”

Taxes

Values paid by individuals or companies on purchases that the federal or state governments levy. Taxes may take the form of sales tax, property tax, tariffs on foreign goods, or a Pigovian tax on harmful activities (such as a carbon tax).

Companies can also benefit from tax credits or tax abatements, which reduce their tax liability and are often used to incentivize a specific activity (for example, a construction company receiving a tax break for working on an energy-efficient project).

Essential principles, characteristics, and assumptions

The accounting principles below establish a foundational “code of conduct” for financial professionals, outlining guidelines that emphasize timeliness, accuracy, and transparency in financial reporting.

Conservatism

The conservatism principle in accounting requires that expenses and liabilities be recognized as soon as possible, even when some uncertainty exists, while revenues and assets should be recorded only when certain. This approach ensures that financial statements are transparent about potential future losses and cautious about forecasting future gains.

Consistency and comparability

Consistency and comparability are fundamental accounting principles that ensure a company applies the same accounting method or policy across reporting periods. This enables stakeholders to compare financial statements across time, improving the reliability of financial analysis.

Cost principle

According to the cost principle, all assets, liabilities, and equity investments must be recorded at their original purchase cost. This accounting principle provides objective evidence for reported amounts and supports the objectivity principle by basing values on actual transactions.

Economic entity assumption

The economic entity assumption mandates separating a company’s financial transactions from those of its owners or other businesses. Each entity should maintain distinct accounting records and bank accounts, which ensures clarity and integrity in financial reporting.

Full disclosure principle

The full disclosure principle requires that all relevant and material information be disclosed in a company’s financial statements. For example, if there are significant write-downs or complex depreciation calculations, detailed explanations must be provided to ensure transparency for investors and stakeholders.

Going concern assumption

The going concern assumption presumes that a business will continue to operate into the foreseeable future. This allows companies to defer certain expenses, such as depreciation, to later periods, in accordance with generally accepted accounting principles.

Matching principle

The matching principle is central to accrual accounting. It requires that all expenses directly related to revenue-generating transactions be recorded in the same period as the related revenues. This prevents artificial inflation of profits.

Materiality

Materiality states that all information reasonably likely to influence investors’ decisions must be thoroughly reported in financial statements. This ensures users of financial information have access to data that could impact decision-making.

Monetary unit assumption

Under the monetary unit assumption, only transactions measurable in a specific currency are included in financial statements. This prevents the inclusion of subjective or non-quantifiable estimates, such as employee expertise, maintaining the reliability of reported figures.

Quantitative characteristics:

Objectivity principle

The objectivity principle requires that all accounting information be supported by unbiased evidence and documentation, free from personal opinion. This foundational concept enhances the credibility and reliability of financial statements.

Relevance and timeliness

To ensure relevance, financial statements should be prepared and distributed promptly at the end of each accounting period. Timeliness enhances the usefulness of information, while any estimates used for expediency must be clearly disclosed.

Reliability principle

The reliability principle mandates that only transactions supported by verifiable evidence, like receipts or invoices, be recorded. This ensures that users of financial statements can trust reported figures.

Revenue recognition principle

Revenue recognition dictates that revenue be recognized in the income statement in the period it is both realized and earned, regardless of when cash is received. This provides an accurate reflection of a company’s financial performance.

Time period assumption

The time period assumption requires companies to report their financial activities over standard intervals, such as monthly, quarterly, or annually, to ensure consistency and comparability across financial reports.

Achievable’s ACCA FA course and related textbook go into further detail about the principles and characteristics listed above.

Explanation of U.S. Generally Accepted Accounting Principles (GAAP)

GAAP simply means Generally Accepted Accounting Principles, the standard rules a country uses to guide how companies prepare and present financial statements. It isn't one global standard; nearly every country has developed its own version suited to its economy and regulations. The United States uses U.S. GAAP, issued by the Financial Accounting Standards Board (FASB). It's a rules-based system, meaning it sets out detailed, specific guidance for various transactions and generally relies on historical cost. Other countries, such as the UK, Canada, and India, once had their own GAAP, though most have since adopted IFRS, the international standard, for global comparability. The U.S. remains a notable exception.

In the U.S, these accounting principles apply to publicly traded companies, government agencies, and nonprofit organizations, ensuring consistency and transparency in financial reporting.

The Financial Accounting Standards Board (FASB), a nonprofit organization, is responsible for setting and updating GAAP. To ensure compliance with these benchmarks, Certified Public Accountants (CPAs) conduct external audits of organizations’ financial statements. Any figures calculated using non-GAAP methodologies must be clearly disclosed on financial reports for accuracy and comparability.

GAAP emphasizes several core principles, each detailed above, which govern U.S. financial reporting:

• Conservatism Principle (Loss contingency rules ASC 450-20 and Asset impairment rules ASC 360)
• Consistency Principle (including Accounting changes rules 250 and Disclosure Requirements)
• Cost Principle (Asset valuation rules ASC 360)
• Economic Entity Assumption (Consolidation rules ASC 810 and Related party rules ASC 850)
• Full Disclosure Principle (Footnote rules and segment reporting rules ASC 280)
• Going Concern Assumption (Going concern assessment rules ASC 205-40)
• Matching Principle (Revenue recognition rules ASC 606 and expense recognition rules)
• Revenue Recognition Principle (including the five-step revenue recognition model in ASC 606)

Failure to adhere to generally accepted accounting principles can result in mandated restatements, legal consequences, or punitive regulatory actions, including being delisted from public trading.

International Financial Reporting Standards (IFRS)

IFRS is an acronym for International Financial Reporting Standards, developed and maintained by the International Accounting Standards Board (IASB), an independent private-sector organization based in London. Accounting standards issued by the IASB before 2007 were referred to as International Accounting Standards (IASs). IFRS/IAS are currently adopted in 169 jurisdictions worldwide, including major economies such as the European Union, the United Kingdom, Canada, India, Russia, South Korea, South Africa, and Chile. IFRS provides a globally consistent framework for financial reporting, covering a wide range of accounting topics, including revenue recognition, insurance contracts, leases, and financial instruments.

Active IFRS/IASB Standards include:

• IFRS 1: First-time Adoption of International Financial Reporting Standards
• IFRS 2: Share-based Payment
• IFRS 3: Business Combinations
• IFRS 4: Insurance Contracts
• IFRS 5: Non-current Assets Held for Sale and Discontinued Operations
• IFRS 6: Exploration for and Evaluation of Mineral Resources
• IFRS 7: Financial Instruments: Disclosures
• IFRS 8: Operating Segments
• IFRS 9: Financial Instruments
• IFRS 10: Consolidated Financial Statements
• IFRS 11: Joint Arrangements
• IFRS 12: Disclosure of Interests in Other Entities
• IFRS 13: Fair Value Measurement
• IFRS 14: Regulatory Deferral Accounts
• IFRS 15: Revenue from Contracts with Customers
• IFRS 16: Leases
• IFRS 17: Insurance Contracts
• IFRS 18: Presentation and Disclosure in Financial Statements
• IFRS 19: Subsidiaries without Public Accountability: Disclosures
• IAS 2: Inventories
• IAS 7: Statement of Cash Flows
• IAS 8: Accounting Policies, Changes in Accounting Estimates and Errors
• IAS 10: Events after the Reporting Period
• IAS 12: Income Taxes
• IAS 16: Property, Plant and Equipment
• IAS 19: Employee Benefits
• IAS 20: Accounting for Government Grants and Disclosure of Government Assistance
• IAS 21: The Effects of Changes in Foreign Exchange Rates
• IAS 23: Borrowing Costs
• IAS 24: Related Party Disclosures
• IAS 26: Accounting and Reporting by Retirement Benefit Plans
• IAS 27: Separate Financial Statements
• IAS 28: Investments in Associates and Joint Ventures
• IAS 29: Financial Reporting in Hyperinflationary Economies
• IAS 32: Financial Instruments: Presentation
• IAS 33: Earnings per Share
• IAS 34: Interim Financial Reporting
• IAS 36: Impairment of Assets
• IAS 37: Provisions, Contingent Liabilities and Contingent Assets
• IAS 38: Intangible Assets
• IAS 39: Financial Instruments: Recognition and Measurement
• IAS 40: Investment Property
• IAS 41: Agriculture

These guardrails are grounded in four fundamental principles: clarity, relevance, reliability, and comparability. The application of IFRS varies by jurisdiction; for instance, in the EU, all companies must comply with IFRS, whereas in other countries, adoption may be required only for specific types of entities, such as banks or large corporations that exceed certain thresholds.

By providing a common accounting language, IFRS enhances transparency and comparability for businesses operating across borders.

IFRS vs. U.S. GAAP

Despite the name, U.S. Generally Accepted Accounting Principles (GAAP) are more rules-based, while International Financial Reporting Standards (IFRS) are considered more principles-based. U.S. GAAP emphasizes prescriptive standards for financial reporting, detailing precisely how companies and accountants must present their financial statements, whereas IFRS allows for broader interpretation.

These frameworks also differ in how they require companies to record and report key transactions, directly affecting the consistency and comparability of financial data. Differences include the formatting of balance sheets, application of the full disclosure principle, and treatment of items such as interest, asset revaluations, inventory, intangibles, research and development expenses, liabilities, and revenue:

• Under GAAP, current assets are listed first on the balance sheet, while IFRS prioritizes non-current assets.
• Under GAAP, accounts are listed by liquidity; under IFRS, they are listed in reverse order.
• Under U.S. GAAP, interest paid, interest received, and dividends received are classified as operating activities, while dividends paid are classified as a financing activity.
• Under IFRS 18, effective for annual periods beginning on or after 1 January 2027, this flexibility is removed: interest paid and dividends paid must be classified as financing activities, while interest and dividends received must be classified as investing activities, with an exception for entities whose main business activity is investing or providing financing to customers, such as banks.
• Under U.S. GAAP, asset values generally cannot be written back up once impaired. Under IFRS, the revaluation model (IAS 16) allows property, plant, and equipment to be carried at fair value, which can exceed original cost. Upward revaluations are recognized in other comprehensive income (revaluation surplus).
• For inventory valuation, GAAP permits the FIFO (“First In First Out”), LIFO (“Last In First Out”), and weighted-average methods. IFRS does not allow LIFO, thereby supporting greater consistency and comparability for international companies.

Despite these differences, both frameworks share the fundamental objective of promoting transparency, consistency, and comparability in financial reporting to safeguard investors. The FASB and the IASB initiated convergence projects in the 2000s to align U.S. GAAP with IFRS as closely as possible. Even without an active convergence agenda today, both boards continue to collaborate informally on select issues to enhance global consistency.

Global accounting certifications such as the Certified Management Accountant (CMA) and Chartered Global Management Accountant (CGMA) designations cover both GAAP and IFRS/IAS, reflecting the importance of comparability across jurisdictions. Most U.S. CPAs, however, primarily operate under GAAP, so knowledge of these principles is necessary to practice domestically. For professionals seeking international opportunities, proficiency in IFRS is crucial, though knowing both is beneficial for all professionals.

At a glance

Accounting is often referred to as the “language of business,” serving as a fundamental skill for certified experts and all business professionals. Mastery of the core principles of financial statements, including materiality, relevance, and timeliness, is important not only for accountants but also for financial analysts, researchers, and advisors. By understanding the importance of these accounting terms and their role in the preparation and interpretation of financial statements, professionals ensure accurate and consistent financial reporting.

These foundational accounting tenets create a shared framework for understanding business operations in the U.S. and globally. While official financial reporting standards may differ slightly across countries, applying principles such as relevance and materiality ensures that metrics, such as a company’s growth and overall financial health, are reported accurately and consistently, regardless of geographic location. This knowledge enables professionals to uncover key insights, assess the impact of interest and other financial factors, and support strategic decisions that drive new ventures and investment opportunities.