Operating profit margin: the formula, what a good one is, and how to check yours

Short answer: operating profit margin = operating profit ÷ sales × 100, where operating profit is sales minus cost of sales minus operating expenses (wages, rent, vehicles, software, depreciation), before loan interest and tax. A business with £640,000 of sales and £48,000 of operating profit has an operating margin of 7.5%: out of every £100 it sells, £7.50 is left once the business has paid for everything it needs to trade. There is no single “good” figure, because a cleaning company and a software consultancy have very different costs. Three tests tell you more than any industry average: is it rising or falling against last year, does it cover what the business has to pay out after trading (interest, tax, the owners and reinvestment), and how far could sales fall before it hits zero? All three are worked through below.

The operating profit margin formula

• Operating profit = sales − cost of sales − operating expenses
• Operating profit margin % = operating profit ÷ sales × 100
• From the bottom of the Profit and Loss: operating profit = net profit before tax + interest paid − interest received − one-off gains + one-off losses

Use figures without VAT or GST, for the same period on both sides: a month, a quarter or (best) a full year. “Operating margin” and “operating profit margin” mean the same thing. Operating profit explains what goes into the profit figure itself and how it differs from EBIT and EBITDA.

Operating margin vs gross margin vs net margin

Margin	Formula	What it tells you
Gross margin	Gross profit ÷ sales	Whether your prices cover the direct cost of each job or product
Operating margin	Operating profit ÷ sales	Whether the business as a whole makes money from what it does
EBITDA margin	(Operating profit + depreciation) ÷ sales	The same before the wear on equipment; buyers and lenders often quote it
Net margin	Net profit ÷ sales	What is left for the owners after interest and tax

Gross margin is always the highest of the four, and the gap between gross margin and operating margin is your overheads as a share of sales. Types of profit follows one company down every line.

A worked example: a cleaning company in Manchester

These figures are made up. Priya owns a commercial cleaning company with 22 cleaners on the books. Here are its last two years, without VAT.

	Last year (£)	This year (£)
Sales	580,000	640,000
Cost of sales: cleaners’ wages, supplies, travel between sites	(371,200)	(416,000)
Gross profit	208,800 (36.0%)	224,000 (35.0%)
Office wages and Priya’s salary		(98,000)
Van leases and fuel		(28,000)
Rent		(14,000)
Insurance		(9,000)
Software and phones		(7,000)
Other overheads		(12,000)
Depreciation		(8,000)
Total operating expenses	(162,400)	(176,000)
Operating profit	46,400 (8.0%)	48,000 (7.5%)

This year: 48,000 ÷ 640,000 × 100 = 7.5%. EBITDA is 48,000 + 8,000 = 56,000, an EBITDA margin of 8.8%.

Test 1: is it going the right way?

Sales grew £60,000 (10.3%), but operating profit grew only £1,600 (3.4%), so the margin fell from 8.0% to 7.5%. At last year’s 8.0%, this year’s sales would have made £51,200, so the slip cost £3,200. Splitting it:

• Gross margin fell 1 point (36.0% to 35.0%). On £640,000 of sales that is £6,400 less profit. New contracts were priced tighter, and cleaners’ pay rose before the contracts did.
• Overheads fell from 28.0% of sales to 27.5%. Office costs did not grow as fast as sales, which gave back £3,200.
• 6,400 − 3,200 = £3,200, the whole gap.

That is the most useful thing a margin does: profit in pounds went up, so the year looked fine, but each £100 of work earned less. Why did my profit drop? does this split between sales, margin and overheads for any two periods.

Test 2: does it pay for what comes after trading?

Operating profit has to cover everything below it. For Priya’s company that is £6,000 of loan interest, corporation tax, the £25,000 of dividends she takes on top of her salary, and £12,000 she wants to keep each year towards replacing vans.

• After tax she needs 25,000 + 12,000 = £37,000.
• At the 19% small profits rate of UK corporation tax, that takes profit before tax of about £45,680 (37,000 ÷ 0.81).
• Add back the interest: operating profit needs to be about £51,680.
• On £640,000 of sales, that is a required operating margin of 8.1%.

This year’s 7.5% falls £3,680 short. Profit before tax is 48,000 − 6,000 = 42,000; corporation tax at 19% is 7,980; that leaves 34,020, not 37,000. Last year’s 8.0% almost covered it. A 1% price rise on the same work adds £6,400 straight to operating profit and lifts the margin to about 8.4%, enough on its own; the price increase calculator shows how many customers you could lose before a rise stops paying.

Use your own country’s tax rate. Australian base rate entities pay 25%, New Zealand companies 28%, and UK profits over £50,000 get marginal relief up to the 25% main rate, so check the rate with your accountant. For a sole trader, there is no salary in operating expenses, so the required margin has to include a wage for your own work; true profit shows how to take one off.

Test 3: how much cushion does it give?

If the cleaners’ wages and supplies go up and down with the work and the overheads do not, every £100 of lost sales loses £35 of gross profit while the £176,000 of overheads stay. Sales could fall to about £502,860 (176,000 ÷ 0.35) before operating profit reaches zero: a fall of about £137,140, or 21.4%.

A quick way to get the same figure: operating margin ÷ gross margin = 7.5 ÷ 35.0 = 21.4%. A business with a 10% operating margin and a 60% gross margin could lose only a sixth of its sales before making a loss; one with a 10% operating margin on a 20% gross margin could lose half. Losing one large contract is the usual risk for a company like Priya’s, so she also checks how much of her sales comes from her biggest customers with the customer concentration calculator. The break-even calculator does the cushion sum with your own figures.

What is a good operating profit margin?

It depends on the industry, because the split between direct costs and overheads differs so much. A labour-heavy business such as cleaning, building or haulage often runs on a single-figure operating margin and makes it up on volume. A business that sells expertise with few direct costs can, and needs to, run much higher, because its overheads are most of its costs. Industry figures you find online also mix net, operating and EBITDA margins, and most include large companies, so treat them as rough. What is a good profit margin for a small business shows how the owner’s pay changes the number, and where Australian owners can find the ATO’s free ranges for their trade.

The three tests above are more useful than any average:

1. Trend: the margin should hold or rise as sales grow. If it falls while sales grow, you are buying growth with price or with overheads.
2. Required margin: work out the margin that pays interest, tax, the owners and reinvestment, as in test 2. Below it, the business is shrinking in real terms even when it shows a profit.
3. Cushion: operating margin ÷ gross margin is the share of sales you could lose before making a loss. Under about a tenth leaves very little room for one lost customer or a bad quarter.

How to work out your operating margin in Xero

Run Accounting › Reports › Profit and Loss for the last 12 months, and compare it with the 12 months before.

1. Take Gross Profit (if it equals sales, your direct costs are not coded to Cost of Sales accounts; Xero gross profit margin shows how to fix that).
2. Take off Total Operating Expenses.
3. Add back any interest expense and one-off losses that sit inside operating expenses. In Xero’s default chart of accounts, loan interest is an expense account, so it is usually in there.
4. Leave out Other Income (interest received, grants, gains on selling equipment).
5. Divide by Total Trading Income and multiply by 100.

You can add operating profit as a summary row in the report layout editor, and a formula row can show it as a percentage of income; save the layout so it is there next time. Xero reports covers custom layouts and the other reports worth running each month. Menus change between Xero releases and regions, so search Xero Central for “report layout” if your screen differs.

Common mistakes

• Leaving loan interest in operating expenses. It makes the margin look worse than the trading is, and makes it move when you refinance, not when the business changes.
• Counting a one-off gain. Selling a van for more than its book value raises net profit once; it is not operating profit.
• Using VAT- or GST-inclusive sales. That understates the margin by a sixth at 20% VAT, and by about a tenth at 10% GST.
• Comparing a sole trader with a company. A sole trader’s operating profit is before any pay for the owner, so it looks far higher than a company’s, where the director’s salary is an expense.
• Reading one month. Annual insurance, a quiet January or a big job finishing can swing a single month by several points. Use the last 12 months, and compare each month with the same month last year.

Common questions

How do you calculate operating profit margin? Divide operating profit by sales and multiply by 100. Operating profit is sales minus cost of sales minus operating expenses, before loan interest and tax. A business with £48,000 of operating profit on £640,000 of sales has an operating profit margin of 7.5%.

What is a good operating profit margin? There is no single figure, because it depends on the industry: labour-heavy businesses often run on single figures, while businesses with few direct costs need much more. Better tests are whether your margin is holding as sales grow, whether it covers interest, tax, the owners’ pay and reinvestment, and how far sales could fall before it reaches zero.

What is the difference between operating margin and net profit margin? Operating margin is before loan interest, tax and one-off items, so it shows how the trading is doing. Net profit margin is after all of them, so it shows what is left for the owners. With no loans and nothing unusual in the year, operating margin and net margin before tax are the same.

Is operating margin the same as EBITDA margin? No. EBITDA margin adds depreciation and amortisation back, so it is always at least as high as operating margin. For a business with vans or machines, operating margin is the more honest figure, because depreciation is the real cost of wearing them out.

Why is my operating margin falling when sales are growing? Usually because the gross margin is slipping (prices not keeping up with wages or supplier costs, or new work priced too low) or because overheads are growing faster than sales. Compare the gross margin and overheads as a share of sales for the two periods to see which.

Does Xero show operating profit margin? Not on the standard Profit and Loss, which goes from Gross Profit to Net Profit. Take Total Operating Expenses off Gross Profit, add back any loan interest, leave out Other Income, and divide by Total Trading Income. A custom layout with a formula row can show it on the report.

Your margins every Monday

ReportPilot reads your Xero figures and sends a short email every Monday in plain English. It covers sales and profit against last month and the same month last year, and when cost of sales is coded in Xero and gross margin moves by 3 percentage points or more against the month before, the email says so, with what was left from every 100 of sales in each month. It also covers cash, money owed to you that is past due, and bills due soon. It asks Xero for read-only access, and there is a 14-day free trial with no card.