The complete guide to net profit and the income statement
What is net profit?
Net profit, also called net income or the bottom line, is the amount a business has left after every cost has been paid: the product itself, the people who sold it, the building it was sold from, the interest on the loans that financed it, and the tax owed on the result. It is the single most important number on the income statement because it is the only one the owner can actually keep, reinvest or distribute. A business can grow revenue every quarter and still go bankrupt if net profit is negative — revenue pays nobody's bills.
How to read an income statement
An income statement is a structured story that starts with all the money that came in and ends with what is left for the owner. It is read top to bottom in this order: Revenue minus Cost of Sales gives you Gross Profit. Subtract Operating Expenses and you get EBITDA. Subtract Depreciation, Amortization and Interest and you get Operating Profit. Subtract Tax and you get Net Profit. Each level tells you something different: gross profit measures product economics, EBITDA measures the trading business, operating profit measures the asset-financed business, and net profit measures what is yours to keep.
Revenue: where it all starts
Revenue is the total value of goods and services delivered to customers, net of returns and discounts and before sales tax (VAT or GST). For most retailers and restaurants this is dominated by one line — over-the-counter sales — but the calculator above breaks it out so you can track delivery income, service income, commission income, rental income and miscellaneous income separately. Keeping revenue streams distinct matters because they often have very different margin profiles: a coffee shop's in-store sales might run a 70% gross margin while its third-party delivery sales run closer to 35% after commissions and packaging.
Cost of Sales and the inventory equation
Cost of Sales (often called Cost of Goods Sold or COGS) is the landed cost of the product that was actually sold. For a business that holds inventory the formula is Opening Stock + Purchases + Freight + Packaging + Production − Closing Stock. The closing stock is subtracted because it has not yet been sold; it is sitting on the shelf at the end of the period and will become next period's opening stock. Get this wrong and your gross profit will swing wildly between months even if the underlying business is steady. The single most common mistake is forgetting inbound freight — a product that costs $10 from the supplier and $0.40 in freight has a true landed cost of $10.40, and a year of unaccounted freight can quietly drain a full margin point.
Gross profit: the health of the product
Gross profit is the cleanest measure of product economics. It is what you have left after paying for the thing you sold, before any store-level cost. The percentage version — gross margin — is what category managers and buyers obsess over because it is comparable across stores, periods and competitors. A 1-point lift in gross margin in a $5m-revenue retailer is $50,000 of profit that drops straight to the bottom line, because none of the operating costs change. That is why pricing, mix and shrink control matter so much.
Operating expenses: running the business
Operating expenses are everything it costs to run the store after the product is on the shelf. The calculator above splits them into eight groups so you can see where the money actually goes: labour, occupancy, store operating, marketing, transport, administration, plus dedicated buckets for restaurant-specific (food waste, kitchen supplies, gas) and retail-specific (shrinkage, damages, markdown) costs. In most service businesses labour is the biggest line by far; in most retailers occupancy and labour run neck and neck. If any single category is consuming more than a third of total operating expenses, it is the place to focus improvement effort.
EBITDA and operating profit
EBITDA is gross profit minus operating expenses. It strips out financing decisions (interest), asset depreciation policies and tax, leaving a clean view of the trading business. It is the number most often quoted in business valuations because it lets a buyer compare two businesses that own vs lease their equipment, or carry different amounts of debt. Operating profit then puts depreciation, amortization and interest back in. The gap between EBITDA and operating profit tells you how capital-intensive and how indebted the business is — a wide gap is a warning that reported earnings are flattered by ignoring real economic costs.
Tax and net profit
Tax is calculated on operating profit at the corporate rate (27% in South Africa, 21% federal in the US, 25% headline in the UK, with variations everywhere — adjust the rate in the calculator). Subtract tax and you arrive at net profit, the bottom line. Net profit margin (net profit ÷ revenue) is the headline efficiency metric of the whole business. A 5% net margin sounds modest but in a $10m supermarket is $500,000 of distributable profit; the same margin in a $1m coffee shop is $50,000 — barely a living wage for the owner. Always read margin and dollar profit together.
Retail profit benchmarks
For a typical bricks-and-mortar retailer: gross margin 22–35% (supermarkets at the low end, specialty retail and pharmacy at the high end), labour 10–18% of sales, occupancy 4–10%, marketing 1–4%, EBITDA 6–12% and net profit 2–6%. Online and omnichannel retailers look different — gross margins often higher, but delivery and marketing costs an order of magnitude larger. Benchmark against your own segment, not retail as a whole.
Restaurant profit benchmarks
Restaurants are famously tight: food cost 28–35% of sales, beverage cost 18–25%, labour 25–35%, occupancy 6–10%, with the holy grail being a combined food-and-labour (the “prime cost”) of 60% or under. EBITDA in a healthy independent restaurant lands at 8–15%, with net profit of 3–9% after rent, depreciation and tax. Anything below 3% is a sign the menu needs re-engineering or the rent renegotiated.
Small-business profit benchmarks
For most SMEs across hospitality, services and trades, EBITDA in the 10–20% band is healthy and net profit in the 6–12% band is good. Pure-service businesses (consulting, agencies, professional services) can sustain net margins north of 20% because they carry no inventory and minimal fixed assets. Distribution and wholesale typically run thinner — 1–4% net — because volume, not margin, is the model.
How to use the calculator above
Pick the preset closest to your business — Retail Store, Restaurant, Coffee Shop, Hardware Store, Pharmacy, E-Commerce, Wholesale or Custom — and the form pre-fills with realistic numbers you can edit. Type your real revenue and cost lines into the expandable sections; the right-hand income statement, the KPI dashboard at the top, the business health score, the recommendations and the charts all update live. When you are done, use the toolbar to Save the model to your device, Share a link with your numbers pre-filled, or export to PDF, Excel or CSV for your accountant or board.
Five common P&L mistakes
- Forgetting owner salary. If the founder is working full time and not drawing a market-rate salary, the business is subsidising itself and net profit is overstated.
- Mixing tax-inclusive revenue with tax-exclusive cost. Always reconcile both sides on the same basis or your gross margin will appear inflated by the tax rate.
- Skipping depreciation. Equipment, fit-out and vehicles wear out. Depreciation is the accounting recognition of that fact. Ignore it and you will be surprised when it is time to replace the espresso machine or the delivery van.
- Treating shrink as “just a bit of waste”. Shrink, damages and markdowns can easily eat 3–5 points of gross margin. Use our Waste Calculator to size it properly.
- Looking only at margin %. A 60% margin on a slow-moving SKU can be worth less than an 18% margin on a fast mover. Always pair margin with stock turn and dollar profit.
Related tools
- Gross Profit Calculator — zero in on the GP and GP% layer.
- Retail Margin Calculator — convert markup to margin and price products to target.
- Staff Productivity Calculator — drill into the labour ratio.
- Waste Calculator — quantify how shrink and waste hurt the bottom line.