The income statement (also called the P&L, for profit and loss) reports revenue, expenses, and the resulting net income for a specific period — one of the core reports defined throughout our accounting glossary. A month, a quarter, a year. The balance sheet is a point-in-time snapshot. The income statement covers a span of time and resets each year.
The income statement always covers a period. "Income statement for the month ended March 31" means the report shows every revenue and expense transaction with a March date. "Income statement for the year ended December 31" covers the full calendar year.
In QBO, the period is set at report generation time via the date picker. Run for any custom range: last week, MTD, QTD, YTD, prior year, prior quarter. The report recalculates from the underlying general ledger data.
The structure of the income statement is simple at the top level. Total revenue minus total expenses equals net income. Net income is positive when the business is profitable. It's negative when the business is losing money. Everything else in the report is a sub-detail of how the business got from revenue to net income.
At year-end, every revenue account and every expense account closes to zero. The resulting net income (or loss) rolls into Retained Earnings on the balance sheet. The next year starts with all revenue and expense accounts at zero.
This is why the income statement is a "temporary" report. It covers a defined period, then resets. The balance sheet, by contrast, carries forward indefinitely. Retained Earnings keeps growing or shrinking. Cash keeps moving. See the trial balance closing process for the mechanics.
The income statement is a period report showing revenue, expenses, and net income for a defined timeframe. It's also called the P&L (profit and loss). The format runs top-down: revenue → cost of goods sold → gross profit → operating expenses → operating income → other income/expense → net income.
Two different reports answer two different questions:
Both pull from the same general ledger but show different slices. Most monthly closes generate both. The balance sheet ties to the P&L through Retained Earnings. Net income from the P&L flows into Retained Earnings on the balance sheet at year-end.
A standard P&L runs top-down through six or seven sections.
Revenue is the topmost line. Total sales, service revenue, or product revenue for the period. Most small businesses have a single revenue account. Some break revenue out by line of business (Services Revenue, Product Sales, Subscription Revenue). The number that drives every other ratio on the report.
Cost of Goods Sold (COGS) is the direct cost of producing what you sold. For a product business, COGS is inventory cost: what the units cost to make or buy. For a service business with billable contractors, COGS might be the 1099 contractor payments that delivered the service. Pure service firms with W-2 labor often skip COGS entirely.
The accounting principle: only direct costs go in COGS. Overhead (rent, admin salaries, marketing) belongs in operating expenses, not COGS.
Gross profit is revenue minus COGS. Gross margin is gross profit as a percentage of revenue. Both numbers reveal pricing power and unit economics. How much profit the business makes on each dollar of sales before overhead.
A SaaS business often has 75-90% gross margin. A retail business might run 30-50%. A general contractor might run 15-25%. The right benchmark depends entirely on the industry.
Operating expenses (opex) are the costs of running the business that aren't direct cost of sales. Salaries, rent and utilities, software subscriptions, marketing, professional fees. In QBO, these are usually 15-40 different expense accounts depending on chart of accounts detail.
Opex tells you the cost of the operational machine. Excessive opex relative to revenue means too many people, too much real estate, or too much overhead. Lean opex with good gross margin means a healthy business.
Operating income is gross profit minus operating expenses. It's the profit from running the core business, before interest, taxes, and one-off items. This is the number that matters for evaluating operational efficiency. A business can have great revenue and bad operating income if its cost structure is broken.
Below operating income, the P&L adds non-operational items:
These are separated from operating income because they're not part of the core business performance. A loan-funded business has interest expense. That doesn't mean the operations are broken. Separating it on the P&L lets readers evaluate operations without that noise.
Net income is the bottom line. What's left after every revenue and expense item. Positive net income means the business made money in the period. Negative means it lost money. This is the number that closes to Retained Earnings on the balance sheet at year-end.
Sample P&L for a small services firm, March:
Line | Amount
Service Revenue | $42,000
Cost of Services (contractors) | $12,000
Gross Profit | $30,000
Salaries | $14,000
Rent | $2,400
Software Subscriptions | $1,200
Marketing | $1,800
Professional Fees | $800
Other Operating Expenses | $1,500
Total Operating Expenses | $21,700
Operating Income | $8,300
Interest Expense | $400
Net Income | $7,900
Gross margin: $30K / $42K = 71%. Operating margin: $8.3K / $42K = 20%. Net margin: $7.9K / $42K = 19%.
A consulting firm with W-2 employees and no contractor labor may not show COGS at all. The labor cost is in Salaries (operating expense) rather than COGS. The choice is partly accounting convention. Some bookkeepers split labor between billable (COGS) and non-billable (opex). Others put all labor in operating expenses.
GAAP doesn't strictly require a COGS line for service businesses, so the practice varies. What matters is consistency. Pick a treatment and apply it the same way every period.
A bookkeeper reading the P&L pulls insight from each section.
Compare current-period revenue to prior periods. Month-over-month growth tells you about trend momentum. Year-over-year growth corrects for seasonality. A flat revenue line for six months is a flag. Either the business has plateaued or there's a billing issue (invoices not going out, AR not being booked correctly).
Gross margin compression (gross margin trending down quarter over quarter) usually means one of two things. Prices are dropping (competitive pressure or unsold inventory discounted). Or COGS is rising (input cost inflation, contractor rate increases). Either is worth investigating before it spreads further down the income statement.
Operating income reveals whether the business model works at scale. A business can have growing revenue and shrinking operating income if costs are scaling faster than sales. The opposite, flat revenue but expanding operating margin, usually means cost discipline is improving even when sales aren't.
Net income is the residual after every line item. It's the most-cited number but the least diagnostic. By the time you're at the bottom line, every problem and every win has been baked in. Operating income is usually a better diagnostic for operating performance. Net income is what flows to the balance sheet.
Rough gross margin benchmarks:
Use these as starting reference points, not standards. The actual benchmark for any specific business depends on size, geography, and pricing strategy. A healthy SaaS business at 60% gross margin probably has cost-of-revenue inefficiencies. One at 85% has very efficient operations or is under-investing in service infrastructure.
A single-period P&L tells you what happened. Comparative P&L tells you whether what happened is normal.
Compare the current month to the prior month. Month-over-month catches near-term changes. A marketing campaign that drove revenue, a one-time expense that distorted opex, a cost cut that's starting to flow through. Useful for tactical decisions and short-term diagnostics.
Compare the current month to the same month last year. Year-over-year corrects for seasonality. A retailer's December revenue is meaningless without comparison to last December. A tax CPA firm's April revenue is misleading without prior April. YoY is the right comparison for businesses with seasonal patterns.
A common-size P&L shows every line as a percentage of revenue. Salaries 33% of revenue. Rent 6% of revenue. Marketing 4% of revenue. This is the comparison that survives across business sizes. A $500K business and a $5M business can be compared on the same dimensions when expressed as percentages of revenue.
The common-size P&L is also the right tool for benchmarking against industry norms. Industry research databases publish operating ratios as percentages of revenue, not absolute dollars.
Year-over-year can hide a deteriorating trend if the prior year was equally bad. A business that's been losing 5% MoM for six months might still show flat YoY if the same pattern existed last year. Always run both comparisons.
Conversely, MoM can over-react to a single bad month. A 30% MoM revenue drop might just be that the prior month had a one-time large project complete. YoY gives the longer-term picture.
In QBO, the path is "Reports → Profit and Loss → Customize → Periods comparison." Select "Previous period" for MoM or "Previous year" for YoY. The report renders side-by-side columns with $ change and % change. Save the configuration for monthly close to avoid re-customizing every period.
Standard P&L gives one view of the business. Custom P&L splits it.
Class tracking (an Essentials and Plus feature in QBO) lets you tag every transaction with a "class." Typically a service line, business unit, or revenue stream. The same chart of accounts is used across classes. The class is an additional dimension.
A small agency might use classes for "Brand Strategy," "Web Development," and "Retainer Clients." Every revenue and expense transaction gets tagged with one of those three. The P&L by Class report renders each class in its own column, so the agency can see profitability by service line.
Location tracking is similar but tracks geography or division instead of service line. A multi-location restaurant uses location tracking for each restaurant. A two-state services firm uses it for each state. The Profit and Loss by Location report shows each location's standalone P&L.
QBO Plus supports both class and location tracking simultaneously. QBO Essentials only supports class. QBO Simple Start supports neither.
Class tracking helps when the business has multiple revenue streams or service lines that should be evaluated separately. Location tracking helps when the business has geographic or divisional separation. Some businesses use both.
The trade-off: class and location tagging adds time at transaction entry. Every Invoice, Bill, and Expense needs the right tag. If the categorization is sloppy, the custom P&L is unreliable. The discipline cost is real, but the resulting analytical capability is significant.
A digital agency with two service lines, "Web" and "Marketing," tags every transaction. The P&L by Class report shows:
Without class tracking, the agency owner sees only the consolidated P&L and assumes both lines are equally profitable. With class tracking, they can see Marketing has higher margin and Web carries more direct labor risk.
Three mistakes show up over and over.
A laptop purchase ($2,400) booked to Computer Expense rather than capitalized as Fixed Assets inflates current-period expense and skips depreciation entirely. This understates operating income by the full purchase price in year one and overstates it in subsequent years. The IRS de minimis safe harbor ($2,500 per item without an applicable financial statement) does provide some flexibility. Items below the threshold can be expensed directly. Anything above should be capitalized.
The fix is to recategorize the original transaction to Fixed Assets, set up the depreciation schedule, and let it flow correctly going forward.
Borrowing $50,000 from a bank isn't revenue. It's debt. The journal entry is debit Cash, credit Loan Payable. Both balance sheet accounts. The P&L doesn't move. If the loan is mistakenly booked as revenue, the P&L is overstated by $50K and the balance sheet is missing the liability.
Cleanup: reverse the revenue, post the loan to a new Loan Payable account, and re-run the P&L. The accrual vs cash accounting framework applies to loans the same way as to other transactions.
For sole proprietors and partnerships, owner draws are not a business expense. They're equity reductions. Debit Owner's Equity, credit Cash. If draws are booked to "Owner Compensation" or similar expense account, the P&L is understated and the books look less profitable than they really are.
For S-corps, the situation is different. Owner-employees should be on payroll for reasonable comp, and additional distributions are equity (not expense). For C-corps, dividend distributions are also equity. The right treatment depends on entity type.
Quick reference for owner pay treatment:
Each entity type has its own rules. Misclassifying owner pay produces a wrong P&L and wrong tax outcomes. When in doubt, confirm with a CPA before year-end close.
Growthy is bookkeeping software, not a CPA firm. This content is educational, not professional advice. Full disclaimer.
Related: Accounting & Bookkeeping Glossary, Trial Balance: What It Is, How to Read It, and What to Do When It's Off, Accrual vs Cash Accounting: Which Method and Why It Matters
Free during alpha. Read-only access. You review every sync.
CPA firm partner who got tired of watching bookkeepers click categorize 500 times a day. Built Growthy to fix it.
View all articles →Growthy is dedicated to helping businesses of all sizes make informed decisions. We adhere to strict editorial guidelines to ensure that our content meets and maintains our high standards.
Undeposited Funds is the QBO holding account where customer payments sit between receipt and bank deposit. It exists so a single bank statement deposit can match multiple customer payments. Here's how to use it correctly and clear stuck balances.
Uncategorized Expense is QuickBooks Online's catchall for transactions imported but never assigned to a real category. A clean book has $0 in this account. Here's how to recategorize what's there and prevent new ones from landing.
The trial balance lists every GL account with its debit or credit balance, proving total debits equal total credits. Here's how to read it, and the troubleshooting framework for when it doesn't balance.