How to Read a Profit and Loss Statement (And Why Every Small Business Owner Should)

A profit and loss statement is one of those things most small business owners know they should understand, but few actually sit down and learn to read properly. It often gets filed away with the tax return or glanced at once a year when the accountant sends it over.

That’s a missed opportunity. Your P&L is the clearest snapshot of how your business is actually performing — not how busy you feel, not how much revenue is coming in, but whether the whole operation is making money or losing it.

Here’s how to read one, in plain English.

What is a profit and loss statement?

A profit and loss statement — also called an income statement or a P&L — summarises your business income and expenses over a specific period. That period might be a month, a quarter, or a full financial year. In Australia, the financial year runs from 1 July to 30 June, so your annual P&L will typically cover that window.

The purpose is simple: it tells you whether your business made a profit or a loss during that period. Revenue minus expenses equals your bottom line.

It’s one of the three core financial statements every business should be producing, alongside the balance sheet (what you own and owe at a point in time) and the cash flow statement (how money moved in and out). The P&L is the one most small business owners find most intuitive, because it answers the most basic question: did we make money?

The structure of a P&L

Most profit and loss statements follow the same basic structure. Once you understand the sections, you can read any P&L — whether it’s from your accounting software, your bookkeeper, or the ATO’s template.

Revenue (or income). This is the top line. It includes everything your business earned from its normal operations during the period — sales of goods, fees for services, recurring subscriptions, whatever your business does to generate income. It does not include GST collected, loans received, or money from selling assets. Those are separate.

Cost of goods sold (COGS). If your business sells physical products, this section captures the direct costs of producing or purchasing those goods. Materials, manufacturing costs, freight — anything directly tied to delivering what you sell. Service businesses might not have a COGS section, or it might be small (subcontractor costs, for example).

Gross profit. Revenue minus COGS gives you gross profit. This number tells you how much money you’re making from your core business activity before you pay for all the overhead. If your gross profit margin is thin, it doesn’t matter how many sales you make — there’s not enough left to cover everything else.

Operating expenses. These are the costs of running the business that aren’t directly tied to producing your product or service. Rent, utilities, wages, insurance, software subscriptions, marketing, professional fees, depreciation — the day-to-day costs of keeping the lights on. In Australia, this is also where you’ll see your super guarantee contributions for employees.

Operating profit (or EBIT). Gross profit minus operating expenses gives you your operating profit, sometimes called earnings before interest and tax. This tells you how profitable the core business operations are, before financing costs and tax obligations.

Net profit (the bottom line). After subtracting interest on any loans and your income tax expense, you arrive at net profit. This is the number everyone jumps to — and it matters — but the sections above it tell you much more about what’s actually happening in the business.

What to look for when reading your P&L

Knowing the structure is step one. Knowing what to look for is where it gets useful.

Revenue trends. Is your revenue growing, flat, or declining? Compare your P&L across multiple periods — month over month, quarter over quarter, year over year. A single period’s P&L is a snapshot. Multiple periods show you the trajectory.

Gross profit margin. Divide your gross profit by revenue. If you’re a product business and your margin is 30%, that means 70 cents of every dollar goes straight to producing what you sell. Track this over time. If it’s shrinking, your costs are rising faster than your prices — and that’s a problem worth catching early.

Expense creep. Operating expenses have a way of growing quietly. A new subscription here, a hire there, slightly higher rent. Compare your operating expenses as a percentage of revenue across periods. If that percentage is climbing while revenue is flat, profitability is being squeezed.

The gap between gross profit and net profit. A healthy gross margin paired with a thin or negative net profit means your overhead is too high relative to your output. Either you need to grow revenue or cut operating costs — and the P&L tells you exactly where the money is going.

One-off items. Sometimes a P&L looks bad because of a one-off event — a large equipment purchase, a legal settlement, a bad debt write-off. Similarly, a P&L might look great because of a one-time windfall. Identify these and mentally adjust for them to get a clearer picture of ongoing performance.

Common mistakes small business owners make

Only looking at the bottom line. Net profit is important, but it doesn’t tell you why. Two businesses can both show $50,000 net profit with completely different stories — one might have strong margins and low overhead, the other might have massive revenue but costs eating almost all of it. The journey through the P&L matters as much as the destination.

Not reviewing frequently enough. An annual P&L is a history lesson. A monthly P&L is a management tool. If you only look at your P&L once a year at tax time, you’re finding out about problems months after they started. Review monthly, or at minimum quarterly.

Confusing profit with cash. Your P&L might show a healthy profit, but that doesn’t mean the cash is in your bank account. Revenue is recorded when you earn it (when you invoice), not necessarily when the money arrives. If your clients take 60 days to pay, your P&L might show profit while your bank account shows a different story. This is why you need both a P&L and a cash flow statement.

Ignoring it altogether. The most common mistake of all. Many small business owners never look at their own P&L — they leave it entirely to their accountant. Your accountant can prepare it, but you should be able to read it and understand what it’s telling you. It’s your business.

How often should you produce a P&L?

At minimum, quarterly. Ideally, monthly. If you’re using accounting software that connects to your bank feeds and keeps your transactions categorised, generating a P&L takes seconds — the data is already there.

Monthly P&Ls let you spot trends early, catch problems before they compound, and make decisions based on current data rather than gut feel. They’re also useful when talking to your accountant, applying for finance, or planning for the next quarter.

Making your P&L work harder

A P&L on its own is useful. A P&L compared to previous periods is more useful. A P&L compared to a budget is most useful of all.

If you set a budget at the start of the financial year — expected revenue, target expenses, planned profit — you can compare each month’s actual P&L against the budget. The variances tell you exactly where things are going better or worse than planned, and give you time to adjust.

This doesn’t need to be complicated. Even a simple comparison of last month’s actuals against your budget can surface insights that change how you run the next month.

The bottom line

Your profit and loss statement is one of the most powerful tools you have as a business owner. It’s not just for your accountant or the ATO — it’s for you. Learn to read it, review it regularly, and use it to make decisions. The businesses that stay healthy are the ones whose owners know their numbers.