Operating margin vs net margin: the two profitability numbers and which one to use when.

Operating margin is operating profit (EBIT) divided by net revenue. Net margin is net profit divided by net revenue — after interest on loans and after corporate tax. Operating margin tells you whether the shop is run well. Net margin tells you what you actually keep.

What it means

Operating margin is the operator's metric. It strips out two things you do not control day-to-day — loan interest (a decision you made when you opened) and corporate tax (a percentage the government sets) — and shows the percentage of every euro of revenue that survived the operation itself. A 12% operating margin means that for every €100 of net revenue your shop earned, €12 was left after COGS, variable costs and fixed costs were paid.

Net margin is the owner's metric. It is what survives after the bank takes its interest and the tax office takes its corporate tax. A 7% net margin on the same €100 of revenue means €7 was actually left for you, after the loan payment and the annual tax bill. The gap between operating margin and net margin is the cost of how the business is financed and taxed — not how it is run.

Both numbers use net revenue (after VAT and card fees) as the denominator, never gross. The gross-vs-net revenue post covers why this matters — using gross revenue inflates both ratios by 20-26% and quietly hides profit problems.

How to calculate each

Operating margin = EBIT ÷ Net revenue × 100
Net margin       = Net profit ÷ Net revenue × 100

Where:
  EBIT       = Net revenue − COGS − Variable − Fixed-cost slice
  Net profit = EBIT − Interest − Corporate tax

In nouz, operating margin is computed every evening from the daily close-out, because EBIT is computed every evening. Net margin is harder to surface daily because interest and corporate tax are typically known monthly or quarterly — most owners look at net margin as a year-end number, after the accountant finalises the corporate tax bill.

Worked example

A small café in Vienna with €18,000 of net monthly revenue. €1,800 of monthly EBIT. €200/month of loan interest on a €40,000 startup loan. Austrian corporate tax of roughly 23% on what is left.

The same café has a 10.0% operating margin and a 6.8% net margin. The 3.2 percentage point gap is entirely down to financing (the loan) and taxation. If the owner pays off the loan, the operating margin stays at 10% but net margin rises to about 7.7%. If the owner refinances at a higher rate, operating margin still stays at 10% but net margin falls. The operating margin tells you the shop is being run the same way — only the financing changed.

What is a healthy margin?

Across the small-shop verticals nouz tracks, operating margin typically sits around 60-75% of the gap to net margin. A few rough ranges:

The full benchmarks post goes deeper on what moves each ratio by sector. Two patterns hold across all of them: net margin is always lower than operating margin, and the gap is bigger in early years (when loan interest is heaviest) and smaller in mature years.

Why it matters

Most small-shop owners only see net margin once a year, when the accountant produces the annual return. By then, twelve months of decisions have already happened. Operating margin is the version you can track daily — it answers "is the operation healthy?" tonight, not next March. If operating margin is healthy and net margin is thin, the fix is in the financing layer. If operating margin is thin, the fix is in the operation itself.

Related concepts

• EBIT explained — the numerator of operating margin, in plain English.
• Small business profit margin benchmarks 2026 — what is typical for cafés, retail, salons and e-commerce.
• Gross vs net revenue — why margin ratios should always use net revenue.
• How to read a P&L statement — where operating and net profit sit on the page.

FAQ