Profit and loss statement: reading the report that says whether you made money

A profit and loss statement — also called an income statement, or just the P&L — summarises what a business earned and what it spent over a period, and ends with the difference. It covers a stretch of time, which is what separates it from the balance sheet: the balance sheet is a photograph of one moment, the profit and loss statement is a recording of what happened between two moments.

It is the report owners look at most and understand least, largely because the bottom line gets all the attention while the useful information sits in the structure above it.

How a profit and loss statement is built

The layout is a sequence of subtractions, and each stage answers a different question.

• Revenue — what you earned from customers in the period, whether or not they have paid yet.
• Cost of sales — the costs that exist because of those specific sales: materials, the goods themselves, delivery, direct labour, per-transaction fees.
• Gross profit — revenue minus cost of sales. What is left to run the business with.
• Operating expenses — the costs of existing rather than of selling: salaries, rent, software, insurance, marketing, professional fees.
• Operating profit — gross profit minus operating expenses. The result of the trade itself.
• Interest, tax and anything unusual — financing and one-off items that are not about how well you trade.
• Net profit — what actually remains.

The most common mistake in a small-company P&L is putting costs in the wrong band. If delivery charges sit in operating expenses, gross margin looks better than it is and every pricing decision based on it is wrong. The test is simple: would this cost exist if you had made no sales at all? If yes, it is an operating expense.

What each line tells you

Gross margin — gross profit as a percentage of revenue — is the number that matters most, because it is the one you can act on. A falling gross margin means either your prices are drifting down, your costs are drifting up, or your sales mix has shifted towards work that pays less. Those are three different problems with three different fixes, and none of them are visible from net profit.

Operating expenses are worth reading as a proportion of revenue rather than in absolute terms. Costs that grow in step with revenue are usually fine. Costs that grow while revenue is flat are the ones to look at, and they tend to accumulate quietly — subscriptions, small recurring services, an extra tier on something.

Profit is not cash

This is the part that catches people out, and it is worth being blunt about. A profit and loss statement can show a healthy profit while the bank account empties, because profit is recorded when work is done and cash moves when someone pays. A month where you invoice NOK 300,000 and collect NOK 80,000 is a good month on the P&L and a difficult one in reality.

The same works in reverse: buying stock drains cash without touching the P&L until the stock sells. So does repaying a loan. If the P&L and the bank balance are telling different stories, both are usually right and you need the cash flow view as well.

Reading one in five minutes

1. Compare the period against the one before it and against the same period last year, not against zero.
2. Look at gross margin as a percentage first, before any absolute figure.
3. Scan operating expenses for lines that moved by more than a fifth, and find out why.
4. Check revenue recognition: is anything in here that has not actually been delivered?
5. Check for one-off items sitting in the middle of the statement, where they distort the trend.
6. Read the net profit last, as a check on the story the lines above already told.
7. Write one sentence explaining the biggest change. If you cannot, the categorisation needs work rather than the business.

Where it goes wrong

Most unreadable profit and loss statements are unreadable for the same reason: too many categories, invented one at a time as transactions arrived. Fifty expense accounts do not give you more insight than fifteen; they give you the same insight spread too thin to notice. Consolidate anything you would never make a decision about separately.

The other frequent problem is inconsistency across periods. If something moved from one category to another halfway through the year, the comparison is meaningless and nobody remembers the change happened. Rename or restructure at a period boundary, and write down that you did.

Producing it without a fight

The statement itself is arithmetic. Everything difficult happens earlier, in categorisation, in cut-off, in whether the underlying records are complete. Ettex Books keeps the ledger behind it, so the profit and loss statement is generated from the transactions rather than rebuilt in a spreadsheet each period, and prior periods stay comparable once locked.

What it will not do is file anything or tell you what your tax position is. Statutory formats, filing requirements and the treatment of specific items differ by country and by company size, and those rules govern — not the on-screen layout. For anything where the answer changes what you owe, ask your accountant rather than a template.

Read the profit and loss statement from the top: margin first, expenses as a proportion, net profit last. And never mistake it for a cash position.