Ask an owner what their margin is and you will often get a confident answer. Ask how it was calculated and the confidence usually fades. The number is typically sale price minus the most obvious cost, and everything else is missing.
The costs that go unrecorded
Small cash expenses are the biggest blind spot. Fuel, tea, small repairs, courier charges, an urgent purchase paid from someone's pocket. Individually trivial, and collectively often 5 to 10 per cent of turnover in a small business. They are missing from the P&L because nobody recorded them, and they are being paid from real profit.
Owner salary is the second one. If you do not pay yourself a market salary and record it as a cost, your profit figure is overstated by exactly what your own time is worth. A business that only looks profitable because the owner works free is not profitable. It is a job with extra risk.
Time is a cost in service businesses
This is where service businesses differ from traders. If a project quoted at forty hours takes seventy, your margin is roughly half what the quotation implied, and nothing in your accounts will show it. The invoice value did not change. Only the cost of delivering it did, and that cost was time nobody measured.
Businesses that track rough hours against jobs almost always find one or two clients who are consistently unprofitable. That is uncomfortable, and also extremely useful.
Bad debt is a cost, not an accident
Money invoiced and never collected is not a neutral event. It is an expense. If you write off two lakh a year, that is a two lakh annual cost, and it should be visible in your margin calculation, not treated as bad luck.
How to get closer to the truth
You do not need perfect accounting. You need three things recorded consistently: every expense including small cash ones, a notional owner salary, and rough time against jobs.
Do that for one quarter and compare the result with what you believed your margin was. The gap is usually somewhere between three and fifteen percentage points, and it is almost always in the direction you were not hoping for.
Why this matters more than growth
Growing a business with an unclear margin scales the problem. Every additional order on a thin or negative margin makes things worse while looking like progress. Knowing the real number first is what makes growth safe.
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