The five basic accounting principles under GAAP are revenue recognition, matching, historical cost, full disclosure, and objectivity. Together they set the rules U.S. companies follow when they record transactions and prepare financial statements. The Financial Accounting Standards Board (FASB), a private nonprofit, writes the standards, and the Securities and Exchange Commission (SEC) enforces them for publicly traded companies. The point of having shared principles is comparability: an investor, lender, or regulator reading two sets of financials should be looking at the same scorekeeping, not two different inventions.
Who Has to Follow GAAP
Any company that files financial statements with the SEC must prepare them under GAAP. Regulation S-X is blunt about it: financial statements from domestic issuers that aren’t prepared under GAAP are “presumed to be inaccurate or misleading.”1SEC.gov. Financial Reporting Manual – Topic 1 That sweeps in every company listed on a U.S. exchange and every company raising money through publicly registered securities.
Private companies aren’t compelled by federal law to use GAAP, but lenders, venture capital firms, and acquirers routinely require GAAP-compliant statements before they’ll fund anything. The Small Business Administration goes further for its supervised lenders, requiring accrual-basis books kept in accordance with GAAP and annual audits by a CPA.2eCFR. 13 CFR 120.463 – Regulatory Accounting Requirements for SBA Supervised Lenders FASB’s Private Company Council has built a few simplified alternatives into GAAP for smaller businesses, but those are adjustments within the framework, not a separate set of rules.
Revenue Recognition Principle
Revenue is recorded when the company has delivered what it promised, not when cash arrives. A landscaping business that finishes a $5,000 job in June books the revenue in June, even if payment doesn’t come in until July. Waiting for the check would make June look worse and July look better than either month actually was.
The formal framework lives in ASC Topic 606, which sets out a five-step process:
- Identify the contract, confirming both parties have agreed and payment terms are clear.
- Identify the performance obligations, meaning the distinct deliverables inside the contract.
- Determine the transaction price, including variable pieces like bonuses or discounts.
- Allocate the price across the deliverables based on their standalone value.
- Recognize revenue as each obligation is satisfied, either at a point in time or over the life of the work.
The model matters most for complex arrangements. A software company that sells a license bundled with implementation services and a two-year support plan can’t record the full contract value on signing day. Each piece is priced separately, and revenue moves onto the income statement as each obligation is fulfilled. For a straightforward retail sale, all five steps collapse into a single moment, but the logic is identical.
Matching Principle
Expenses belong in the same reporting period as the revenue they helped produce. If a company closes a $100,000 sale that generates a 5% commission, the $5,000 expense is recorded alongside the sale, not whenever the commission check clears. Separating the two would inflate profit in one period and deflate it in the next.
Inventory accounting is where matching does most of its work. When a retailer buys 1,000 units for $20,000, that spending doesn’t hit the income statement as an expense right away. It sits on the balance sheet as an asset. Only when the units sell does the cost move to the income statement as cost of goods sold. Without this, a company that bought heavily in March and sold heavily in April would look like it was hemorrhaging money one month and printing it the next.
Two adjustments keep matching working at the edges of a reporting period:
- Accrued expenses cover a service or benefit received in the current period when the invoice hasn’t arrived yet. The expense is recorded now and reversed when the bill comes in.
- Prepaid expenses cover something paid for now but used later, like a 12-month insurance policy purchased in October. Only the portion covering the current period is expensed. The rest stays on the balance sheet until the months it covers arrive.
Getting these adjustments wrong is one of the most common ways companies accidentally misstate earnings, and it’s one of the first areas auditors examine during year-end procedures.
Historical Cost Principle
Assets are recorded on the balance sheet at the price actually paid, including any costs needed to get the asset ready for use, such as shipping, installation, or site preparation. A warehouse purchased for $1 million stays on the books at $1 million even if the local real estate market surges or crashes the following year. Purchase price is objective and provable. Market valuations depend on appraisals and assumptions that reasonable parties could dispute.
This conservative approach keeps companies from inflating net worth by marking property up during boom times, and it keeps financial statements from swinging on market conditions the company doesn’t control. The trade-off is that long-held assets can drift far from current market value, which is why GAAP requires additional disclosures when the gap grows material.
Historical cost isn’t permanent in one direction: downward. When an asset loses significant value and isn’t expected to recover, GAAP requires a write-down called an impairment loss. Under ASC 360, management first checks whether the asset’s carrying amount exceeds the total undiscounted cash flows the asset is expected to generate. If it does, the company measures the impairment as the difference between carrying amount and fair value, and records that loss on the income statement. Once recorded, an impairment can’t be reversed later, even if the asset’s value recovers. The written-down figure becomes the new cost basis going forward.
Certain financial instruments, like marketable securities, are treated differently and reported at fair value. For the buildings, equipment, and machinery most businesses actually operate on, historical cost is the default.
Full Disclosure Principle
Financial statements have to include everything a reasonable investor would want to know before making a decision. The SEC’s Rule 12b-20 states that reports must contain whatever additional information is necessary to keep the required statements from being misleading.3SEC.gov. Form 10-K General Instructions The balance sheet and income statement are the starting point. The rest of the story usually sits in the footnotes.
Footnotes explain accounting methods, describe pending litigation that could create future liabilities, lay out the terms of major debt, and break down pension commitments. A potential $500,000 lawsuit settlement that could meaningfully affect cash position gets disclosed before any money changes hands. Public companies deliver most of this through their annual 10-K filings.
The gatekeeper is materiality. Not every detail warrants disclosure. The test, drawn from Supreme Court precedent, is whether a reasonable investor would view the information as “significantly altering the total mix” of what’s already available.4PCAOB. Auditing Standard 14 Appendix B – Qualitative Factors Related to the Evaluation of the Materiality of Uncorrected Misstatements That judgment turns on dollar amounts and context together. A misstatement that flips a quarterly profit into a loss is material regardless of size. So is one that trips a loan covenant or conveniently pushes executive bonuses over a payout threshold. Auditors weigh these qualitative factors alongside the raw numbers, and small-dollar misstatements tied to fraud can be material even when they look insignificant in isolation.
Objectivity Principle
Every number in the financial statements needs backup that someone outside the company could verify independently. Receipts, bank statements, contracts, and invoices form the evidence trail auditors follow when checking whether reported figures match reality. The purpose is to remove the temptation to record transactions based on optimistic estimates or self-serving assumptions.
The Sarbanes-Oxley Act of 2002 turned this principle into a legal mandate for public companies, with personal consequences for executives. Section 302 requires the CEO and CFO to sign each quarterly and annual filing, certifying that the statements are accurate and that internal controls are effective. Section 404 adds a separate requirement: management must formally assess internal controls over financial reporting every year, and external auditors must independently evaluate that assessment. These aren’t procedural formalities. Under Section 906, an executive who willfully certifies a false financial report faces fines up to $5 million and as many as 20 years in prison.
Private businesses feel the objectivity principle through recordkeeping discipline rather than SOX certifications. The IRS requires businesses to retain tax records for at least three years from the filing date, extending to six years when unreported income exceeds 25% of gross income and seven years for claims involving worthless securities or bad debt.5Internal Revenue Service. How Long Should I Keep Records Lenders performing due diligence will often ask for organized source documents going back further. If the documentation doesn’t exist, the financial statements it supposedly supports lose their credibility.
The Going Concern Assumption Behind the Five Principles
Sitting underneath all five principles is an assumption fundamental enough that it rarely gets mentioned until something goes wrong. GAAP presumes the company will continue operating for the foreseeable future. That assumption shapes how virtually every line item is valued. If the business is expected to keep running, recording a factory at historical cost minus depreciation makes sense. If the business is about to liquidate, that factory should be valued at whatever it would bring at auction, which is usually much less.
Under ASC 205-40, management must evaluate at every reporting date whether substantial doubt exists about the company’s ability to continue as a going concern for at least one year after the statements are issued.6FASB. FASB Issues Exposure Drafts on Going Concern and Subsequent Events When that doubt exists, the company must disclose it in the footnotes along with management’s plans to address the situation. If those plans don’t adequately resolve the doubt, an explicit statement to that effect is required. A going concern disclosure is a serious signal to investors and creditors, and it often triggers loan covenant reviews and accelerated due diligence.