Reading a P&L like an owner
The P&L reads top-down like a story: what came in, what the goods cost, what the operation cost, what is left. The skill is knowing which lines to interrogate.
The structure
Revenue − COGS = Gross profit. Gross profit − operating expenses = Operating income. After interest, depreciation and the rest: Net income. Each subtotal answers a different question — is the trade good, is the operation lean, is the business worth it.
Three monthly questions
Is gross margin stable? A drifting margin means pricing, cost or theft. Which two expenses moved most vs last month, and why? Is net income converting to cash — check the cash flow statement beside it, because profit you never collect is fiction.
Use the comparative views
SeroBooks ships the P&L in six views — month over month and prior-year comparisons turn one report into a trend, and by-location turns a chain into accountable stores.
The number that lies most often
When gross profit looks unusually good, the cause is almost never a brilliant quarter — it is cost of goods not posting. Sales are being recorded and the purchases behind them are not, so every sale looks like pure margin. The statement is arithmetically perfect and completely misleading.
The check is quick: does the purchase side of the books show activity proportionate to the sales side? If not, start there before believing the profit.
Tax collected is not income
Sales tax you collect is money held for a government, and it belongs on the balance sheet as a liability rather than anywhere on the profit and loss. Businesses that see tax inflating their revenue line are reading a statement built on a mapping error.
The same logic applies in reverse for marketplace sellers: fees are real costs of selling, and a P&L missing them overstates profit by the entire cost of doing business.
What SeroBooks does with this
Profit and loss reads straight from the ledger for whatever period you choose, with every line drilling to the entries and documents behind it. Tax posts to its own payable accounts, never to income. Marketplace fees post from settlement journals rather than being estimated.
The Report Centre carries six P&L views — standard, detail, year-to-date, previous-year comparison, by month, by location — all from the same postings.
See it in your own numbers.
Free to start, on Windows, Mac, iPad and Android. No credit card.