How to read a P&L when you're not a finance person
Once a quarter your accountant sends a PDF. You scroll to the bottom, look at one number, decide you feel broadly fine or broadly unwell about it, and file the email. The document is not hard to read — it's just never been explained to you in the order that makes sense. Here is that order, and the three checks worth running every time it lands.
What a P&L actually is
A profit and loss statement covers a period — a month, a quarter, a year. It answers one question: over that stretch of time, did more value come in than went out? That's it. Everything on the page is in service of that single subtraction.
It helps to know what it isn't, because the three main financial statements get used interchangeably by people who should know better:
- The P&L (also called the income statement, or the profit and loss account) is a film: what happened between two dates.
- The balance sheet is a photograph: what you own and owe on one specific day.
- The cash flow statement tracks money actually moving — which, as we'll get to, is a different story from profit.
If someone asks “how did we do last quarter?” they want the P&L. If they ask “what are we worth?” they want the balance sheet.
The lines, top to bottom
A P&L is read downward, and each line is the one above it minus something. Once you see that shape, the vocabulary stops mattering much. Here it is with round made-up numbers for a small services company's quarter:
- Revenue — 300,000. Everything you earned from customers. Also called turnover, sales, or the top line. It is not the same as money received.
- Cost of sales — 90,000. The costs that exist only because you delivered the work: contractors on a client project, hosting for the accounts you serve, materials. Also called COGS or direct costs. If you sold nothing next quarter, most of this would disappear.
- Gross profit — 210,000. Revenue minus cost of sales. What the core activity earns before the cost of being a company.
- Operating expenses — 180,000. The cost of existing: salaries, rent, software, insurance, marketing, accountants. Also called opex, overheads, or SG&A. These carry on whether or not you sell anything.
- Operating profit — 30,000. Gross profit minus operating expenses. This is usually the most honest line on the page, because it measures the business doing its actual job. You may see it labelled EBIT, or a close cousin called EBITDA.
- Net profit — the bottom line. Operating profit after interest, tax, and anything else unusual. For most small teams it's close to operating profit, and the gap is mostly tax.
Two derived numbers do most of the interpretive work. Gross margin is gross profit as a percentage of revenue — 70% in the example above. It tells you how much of each sale survives delivery. Net margin is net profit over revenue, and tells you how much survives everything.
The thing that confuses everyone: profit is not cash
This is the one to internalise, because it's behind almost every “the P&L says we made money, so why is the account empty?” conversation.
Most P&Ls are prepared on an accrual basis, which means revenue is recorded when it is earned, not when it is paid. Invoice a client 80,000 on 28 March and the whole 80,000 lands in the March quarter — even if the money arrives in July, even if it never arrives at all. The same runs in reverse: a bill you've received but not yet paid is already sitting in your costs.
So a profitable quarter can coincide with an alarming bank balance, and the statement isn't wrong — it's answering a different question. Profit asks whether the work was worth doing. Cash asks whether you can make payroll on Friday. A young company can fail while profitable, and the P&L will not warn you, because that's not its job.
Two practical consequences. First, a big revenue line means nothing on its own until you know how much of it has been collected — worth checking against what you've actually invoiced and been paid. Second, if you're on a cash basis instead (smaller businesses sometimes are), the opposite distortion applies: a quarter can look terrible purely because one large payment landed a few days after the cutoff.
Three checks, five minutes
You don't need to audit the thing. You need to notice when it's telling you something changed. Compare the current period against the one before it, and against the same period last year if you have it.
- Is gross margin holding? Revenue can climb while margin quietly slides — you're selling more and keeping less of each sale. That usually means discounting, projects running over, or delivery costs creeping. It is the earliest warning on the page and the one most often missed, because the top line looks great.
- Is opex growing faster than revenue? If revenue is up 10% and overheads are up 30%, you are buying growth at a rate the business isn't funding. Sometimes that's a deliberate, funded decision. It should never be a surprise.
- What is your largest single line as a share of revenue? For most small teams it's payroll. Track that percentage over time — it moves slowly, and when it moves it matters more than anything else on the page.
One more habit: read the biggest number in each section, not every number. A P&L with forty rows still only has about six that can move your quarter.
What a P&L will not tell you
It is a genuinely useful document and a badly overloaded one. Things people expect from it that are not in there:
- How long your money lasts. Runway is cash divided by burn, and neither input is on a P&L. That's a separate calculation, and the more urgent one for most early teams.
- Who owes you money. Unpaid invoices sit on the balance sheet as receivables, not here.
- Whether the trend is survivable. A P&L reports a period that has already finished. It is a rear-view mirror, and by the time a quarterly one reaches you it can be describing a situation four months old.
That last point is the real limitation. Quarterly reporting is fine for compliance and too slow for decisions. The questions that actually come up on a Tuesday — are we okay this month, can we afford this hire, did that client ever pay — need a view that's current, and the statutory statements were never designed to provide one.
Where this leaves you
Read the P&L when it arrives, run the three checks, and ask your accountant about anything that moved more than you expected — that conversation is what you're paying for, and “why did gross margin drop four points?” is a much better use of it than “how are we doing?”
Then keep something faster for the rest of the quarter. To be straight about it: Klerky does not produce a P&L, and doesn't try to — it isn't double-entry bookkeeping and it won't give you a balance sheet or a set of statutory accounts. What it does is the operating view in between: income from your invoices, spend from your real expenses and salaries, a profit snapshot, and a runway figure that moves when your costs do. If you need proper accounts, you need an accountant and a ledger, and the two work together rather than instead of each other — the comparison with QuickBooks lays out that split honestly.