Key takeaways
What this article covers, in order:
- What GAAP means in practice
- Who sets GAAP
- The Accounting Standards Codification (ASC)
- Core ideas behind GAAP
- Worked example: GAAP versus cash basis for an annual contract
- GAAP vs IFRS
GAAP stands for Generally Accepted Accounting Principles: the rules U.S. companies follow to prepare financial statements. For businesses and not-for-profits, GAAP is set by the Financial Accounting Standards Board (FASB) and collected in one place, the FASB Accounting Standards Codification (ASC). Public companies must use it in their SEC filings; private companies use it when lenders, investors or auditors ask for it.
Below is what GAAP covers, who writes it, how it differs from IFRS, and what it changes in a small business's books, with a worked example.
What GAAP means in practice
Each word in the name tells you something:
- Generally accepted: the rules carry authority because a recognised standard setter issues them and regulators, auditors and users rely on them.
- Accounting principles: they decide when you record revenue and expenses, how you value assets and liabilities, and what you must disclose.
The goal is comparability. If two companies follow GAAP, a banker can read both sets of statements and know that revenue, inventory and debt were measured on the same basis.
Who sets GAAP
FASB, for companies and not-for-profits
The FASB is an independent, private-sector board established in 1973 and overseen by the Financial Accounting Foundation. The Securities and Exchange Commission recognises the FASB as the accounting standard setter for public companies. When the FASB changes the rules, it issues an Accounting Standards Update (ASU) that amends the Codification.
GASB, for state and local governments
State and local governments follow a separate body of GAAP written by the Governmental Accounting Standards Board (GASB), a sister board under the same foundation. When people say GAAP in a business context, they almost always mean FASB GAAP.
The Accounting Standards Codification (ASC)
Before 2009, U.S. GAAP was scattered across hundreds of FASB statements, interpretations, Emerging Issues Task Force abstracts and AICPA pronouncements. The FASB reorganised all of it into the Accounting Standards Codification, which became the single source of authoritative nongovernmental U.S. GAAP for periods ending after September 15, 2009. Anything not in the Codification (apart from SEC rules for public companies) is non-authoritative.
The ASC is organised by topic number. A few you will meet often:
- ASC 105 - the GAAP hierarchy itself
- ASC 230 - statement of cash flows
- ASC 606 - revenue from contracts with customers
- ASC 842 - leases
- ASC 958 - not-for-profit entities
Core ideas behind GAAP
You do not need to read the Codification to understand the ideas that shape most GAAP statements:
- Accrual basis: revenue is recognised when you satisfy your obligation to the customer, and expenses when they are incurred, not when cash moves.
- Matching costs to the period they relate to: prepaid insurance, depreciation and accrued wages exist so each month carries its own costs.
- Consistency: once you choose a method, such as an inventory cost formula, you apply it period after period and disclose any change.
- Disclosure: the notes to the financial statements are part of GAAP, not an optional extra.
- Conservatism in valuation: for example, receivables are reported net of an allowance for amounts you do not expect to collect, and inventory is written down when it is worth less than cost.
Worked example: GAAP versus cash basis for an annual contract
Northpeak IT, a five-person managed-services firm in Denver with a December 31 year-end, signs a 12-month support contract on October 1, 2026. The client pays the full $24,000 upfront on signing.
On a cash basis
The firm records $24,000 of revenue in October 2026, because that is when the money arrived. Its 2026 profit and loss statement shows all of it.
Under GAAP (ASC 606)
- The obligation is to provide support evenly over 12 months, so revenue is recognised as the service is delivered: $24,000 / 12 = $2,000 a month.
- On October 1, the firm records cash of $24,000 and a liability, deferred revenue (a contract liability), of $24,000.
- At the end of each month it moves $2,000 from deferred revenue to revenue.
- By December 31, 2026, it has recognised 3 x $2,000 = $6,000 of revenue.
- The balance sheet shows $18,000 of deferred revenue, which will become revenue in January to September 2027.
Same cash, same contract, but GAAP 2026 revenue is $18,000 lower than the cash-basis figure. If the firm's bank covenant requires GAAP statements, that difference matters. Note that tax rules for advance payments are separate from GAAP; your tax treatment can differ from your book treatment, which is why your CPA reconciles the two.
GAAP vs IFRS
Most of the world uses IFRS Accounting Standards, issued by the International Accounting Standards Board (IASB) in London. According to the IFRS Foundation, more than 140 jurisdictions require IFRS for all or most publicly listed companies. The United States is the notable exception: domestic public companies use U.S. GAAP, while the SEC permits foreign private issuers to file using IFRS as issued by the IASB.
The two frameworks have converged in important areas, such as revenue recognition, but real differences remain. Some examples:
- Inventory: U.S. GAAP permits the LIFO cost formula; IFRS (IAS 2) does not.
- Property, plant and equipment: IFRS allows a revaluation model that carries assets at fair value; U.S. GAAP generally requires historical cost less depreciation.
- Style: U.S. GAAP is often described as more detailed and rules-based, with industry-specific guidance; IFRS relies more on broad principles and judgment.
If your company has a foreign parent, foreign investors or plans to list abroad, you may need to report under IFRS or reconcile to it.
Does a small business have to follow GAAP?
No federal law requires a private company to use GAAP. Many small businesses keep cash-basis or tax-basis books and that is perfectly legal. You will typically need GAAP statements when:
- A bank loan agreement requires reviewed or audited GAAP financial statements
- Investors, a buyer or a board ask for them
- You are preparing to raise capital or sell the business
- You are a not-for-profit whose funders require audited statements
Private companies also have some simplified alternatives within GAAP, developed with the Private Company Council, which your CPA can tell you about.
Common mistakes
- Calling cash-basis statements GAAP. If revenue is recorded when cash arrives, the statements are not GAAP.
- Booking annual prepayments as income on day one. Under GAAP, unearned amounts sit in deferred revenue.
- Expensing large purchases immediately for book purposes. A tax write-off does not change the GAAP requirement to capitalise and depreciate long-lived assets above your capitalisation policy.
- Skipping accruals at year-end. Unbilled work, unpaid bills and earned-but-unpaid wages all belong in the period.
hellobooks< / a > -supports-gaap-ready-books">How HelloBooks supports GAAP-ready books
HelloBooks is built on double-entry accounting with an audit trail, period locking and year-end close, which are the foundations of statements an auditor can work with. Period-end closing tools handle accruals, prepayments and depreciation; the fixed assets register calculates straight-line or written-down-value depreciation; and journal entries can go through approval before posting. You can produce a profit and loss statement, balance sheet and cash flow statement (direct or indirect method) at any date. Your accountant still makes the judgment calls, such as how a contract should be recognised, but the software keeps the entries, schedules and support in one place.
