An income statement audit requires auditors to verify that every dollar of revenue and expense accurately reflects a company’s financial performance during the reporting period. For business owners and financial officers, understanding what auditors examine, and why, can reduce surprises, speed up the engagement, and strengthen the credibility of your financial statements.
Auditors do not simply scan numbers for obvious errors. They apply targeted procedures to the income statement’s major categories: revenue, cost of goods sold, and operating expenses. Each category carries its own risks for misstatement, and auditors design their testing accordingly. Knowing what to expect during an audit of financial statements helps you organize records in advance and address potential issues before they escalate.
This article breaks down the specific income statement items that draw the most auditor attention, explains the procedures they use, and offers practical guidance for audit preparation. If you are evaluating professional support, Pease Bell’s audit and assurance services team works with companies across many sectors to deliver reliable financial statement audits.
How Auditors Approach Revenue Recognition
Revenue is typically the largest line item on the income statement, making revenue recognition audit procedures a top priority. Auditors focus on whether revenue was recorded in the correct period, at the right amount, and in accordance with applicable accounting standards.
ASC 606 and the five-step revenue model
Under ASC 606 (_Revenue from Contracts with Customers_), companies follow a five-step model to determine when and how to recognize revenue. This principles-based standard, codified in the FASB Accounting Standards Codification, replaced the patchwork of industry-specific and transaction-specific revenue guidance under prior U.S. GAAP with a single framework for all contract-based revenue. Auditors pay close attention to how management applies each step: identifying the contract, determining performance obligations, allocating the transaction price, and recognizing revenue as obligations are satisfied.
Substantive testing of revenue balances
During the income statement audit, your auditor may analyze revenue-related balance sheet accounts such as accounts receivable and deferred revenue to detect over- or understatement. They also conduct substantive tests to verify the legitimacy of receivable balances recognized as revenue during the reporting period.
For complex contract sales, testing typically includes reading the contract itself and confirming that the company earned the right to recognize revenue at the reported amount. For simpler transactions, auditors review supporting documents such as invoices, bills of lading, shipping confirmations, and payment records. If your company adopted ASC 606 or has unusual revenue arrangements, expect auditors to spend additional time evaluating your revenue policies and disclosures.
Why Cost of Goods Sold Gets Heavy Scrutiny
Cost of goods sold (COGS) represents the direct costs a company incurs to produce the goods or services it sells. Because COGS directly affects gross profit, and because it often involves significant dollar amounts, auditors dedicate substantial time to verifying these costs during a financial statement audit.
Testing materials, labor, and overhead
COGS consists of three components: raw materials, direct labor, and manufacturing or production overhead. Each component requires distinct audit procedures. Auditors may review purchase orders, shipping documents, and supplier invoices to verify raw material costs. They examine employee time records and payroll data to confirm labor charges. Overhead allocation, which involves distributing indirect costs across production, requires the highest degree of professional judgment and therefore receives the closest attention.
Companies with significant production activity, such as those in manufacturing, often face the most detailed COGS testing because their cost structures combine all three components. Inventory-heavy businesses should expect auditors to trace costs from source documents through to the general ledger.
Analytical procedures for COGS
Auditors also rely on analytical procedures when testing COGS. They compare COGS as a percentage of revenue across reporting periods to identify unexpected fluctuations. If labor costs as a share of revenue shift materially from one year to the next without a clear operational explanation, it raises a red flag during the audit. Similarly, auditors use inventory balances and turnover ratios to cross-check the amount and cost of inventory consumed during the period.
These techniques follow established audit guidance. The PCAOB’s standard on substantive analytical procedures (AS 2305) directs auditors to develop expectations for recorded amounts and to investigate significant differences from those expectations. To prepare for this portion of the audit, keep detailed records of purchase orders, vendor contracts, time-tracking data, and your overhead allocation methodology. Clear documentation shortens the testing process and reduces the likelihood of follow-up inquiries.
What Auditors Look for in Operating Expenses
Operating expenses cover the costs a business incurs to support day-to-day operations: sales commissions, office supplies, rent, utilities, professional fees, insurance, and advertising, among others. While these amounts are often smaller individually than revenue or COGS, they represent a broad surface for errors and, in some cases, fraud.
Vendor approval and trend analysis
Auditors evaluate operating expenses by reviewing vendor selection and payment approval processes to determine whether reported amounts are reasonable, properly authorized, and recorded in the correct period. They also perform trend analysis, comparing operating expenses over multiple periods and as a percentage of revenue to spot anomalies that warrant deeper investigation.
Fraud-prone expense categories
Certain operating expense categories receive heightened scrutiny. Services such as advertising, consulting, and legal fees can be exploited by dishonest employees to funnel payments to fictitious vendors or inflate legitimate costs. Auditors verify these accounts by reviewing invoices, contracts, and engagement letters in detail. They also inquire about prepaid retainers and confirm that services were actually received. Strengthening the controls around these categories is a core focus of effective risk advisory services.
Attorney confirmation letters
Another important audit step involves attorney confirmation letters. Auditors send letters to a company’s outside legal counsel to assess pending litigation, claims, or assessments that may require disclosure or recognition as a liability on the balance sheet. This procedure is governed by the PCAOB standard on inquiry of a client’s lawyer (AS 2505). These inquiries help auditors evaluate whether the financial statements capture all material contingencies.
How to Prepare for an Income Statement Audit
Audit preparation is one of the most effective ways to reduce the time and cost of an engagement. Companies that organize their records before auditors arrive experience fewer delays, fewer follow-up requests, and a smoother overall process.
Organize your supporting documentation
Start by reconciling all revenue accounts and ensuring that supporting documentation, including contracts, invoices, shipping records, and customer correspondence, is readily accessible. For COGS, compile purchase orders, vendor agreements, payroll records, and a written explanation of your overhead allocation method. For operating expenses, confirm that all vendor invoices are properly approved, coded to the correct general ledger accounts, and supported by evidence that goods or services were received.
Document estimates and policy changes
Review any significant estimates, judgments, or changes in accounting policies that occurred during the reporting period. Auditors will ask about these, and having documented explanations prepared in advance demonstrates strong internal controls and management credibility.
Communicate early with your audit team
Communicate with your audit team before fieldwork begins. Discuss any unusual transactions, new revenue streams, changes in business operations, or known issues. Early communication allows auditors to plan their procedures efficiently and avoids surprises that could extend the engagement timeline. Many organizations strengthen their year-round readiness by pairing audit support with ongoing client accounting services that keep records audit-ready.
Why Income Statement Accuracy Matters Beyond the Audit
Income statement items deserve close attention not only because of their complexity but also because of their direct connection to balance sheet accounts and the potential for manipulation. Revenue overstatement inflates accounts receivable, COGS errors distort inventory values, and misclassified operating expenses can hide liabilities. Auditors understand these linkages and design their procedures to test both the income statement and its balance sheet counterparts.
For business owners, the audit is more than a compliance exercise. A clean audit opinion signals to lenders, investors, and stakeholders that the company’s financial reporting is reliable. By understanding the income statement categories auditors focus on and preparing accordingly, you position your company for a more efficient audit and stronger financial credibility.
Frequently Asked Questions
What do auditors look for on the income statement?
Auditors focus on three main income statement categories: revenue, cost of goods sold, and operating expenses. They verify that amounts are recorded accurately, in the correct period, and in compliance with applicable accounting standards. Auditors also test for unusual fluctuations, misclassifications, and potential fraud indicators.
How do auditors verify revenue recognition?
Auditors test revenue recognition by reviewing contracts, invoices, shipping documents, and payment records. They analyze accounts receivable and deferred revenue balances to confirm that revenue was earned and recorded in the correct period under ASC 606. For complex arrangements, they read the underlying contract to verify each performance obligation.
Why is cost of goods sold important in an audit?
Cost of goods sold directly affects gross profit and often represents one of the largest expenses on the income statement. Auditors verify COGS by testing raw material costs, labor charges, and overhead allocations. They also perform analytical procedures comparing COGS ratios across periods to detect anomalies.
What operating expenses do auditors scrutinize most?
Auditors give extra attention to service-based expenses such as advertising, consulting fees, and legal fees because these accounts are more susceptible to fraud. They review invoices, contracts, and retainer agreements to confirm that payments correspond to services actually received by the company.
How should you prepare for an income statement audit?
Organize supporting documentation for revenue, COGS, and operating expenses before auditors arrive. Reconcile accounts, document significant estimates or policy changes, and confirm that vendor invoices are properly approved. Communicating with your audit team early about unusual transactions or known issues helps the engagement run smoothly.
What is the connection between income statement and balance sheet auditing?
Income statement items directly affect balance sheet accounts: revenue flows to accounts receivable, COGS affects inventory, and operating expenses may create accrued liabilities. Auditors test these linkages to ensure both statements are consistent and free from material misstatement.
