Break-even: the number most owners calculate wrong
Most break-even calculations understate the real number, usually for two specific reasons. How to work out the version that actually changes a decision.
Break-even is one of the few pieces of finance that owners genuinely remember from somewhere. It is also one of the most consistently miscalculated, and the errors run in the same direction every time: they make the business look like it needs less revenue than it does.
The textbook version is simple enough:
Fixed costs ÷ contribution margin = break-even
Both inputs are usually wrong.
Error one: using gross margin instead of contribution margin
Gross margin is whatever your accounting system happens to put above the gross profit line. Contribution margin is what one additional unit of work actually leaves behind after the costs that only exist because you did that work.
Those are different, and in a services business they are often very different. If your chart of accounts puts delivery salaries below the gross profit line — which is common, because salaried staff feel like overhead — your gross margin will look like 60% when your contribution margin is 45%.
The test is not where a cost sits in the report. It is whether the cost would exist if you turned down the work. Subcontractors, pass-through materials, payment processing, commission and delivery labour all vary with the job. Rent does not.
Delivery labour is the hard case, because a salaried person costs the same whether they are busy or not. Treat it as variable anyway. If your team is at capacity, the next job requires someone's hours, and those hours have a loaded cost whether or not the payroll number moves this month.
Error two: leaving your own salary out of fixed costs
A lot of owner-operated businesses calculate break-even against fixed costs that do not include paying the owner properly. That is not a break-even point; it is the point at which the business stops losing money while someone works for free.
Put a market salary for your role into fixed costs. Not what you currently draw — what you would have to pay somebody to do your job. If the business cannot clear that number, you have found something worth knowing, and it is better to know it deliberately than to discover it during a year you wanted to step back.
What the difference looks like
Take a services business with:
- Fixed costs of $48,000 a month, including a $10,000 market salary for the owner
- An average engagement of $6,000
- Direct delivery cost of $3,300 per engagement — loaded labour plus subcontract
Contribution margin is $2,700 per engagement, or 45%. Break-even is $48,000 ÷ $2,700, which is 17.8 — call it 18 engagements a month, or $106,667 of revenue.
Now make the two common errors. Leave the owner's salary out and fixed costs drop to $38,000, giving a break-even of 15 engagements. Use a 60% gross margin instead of the 45% contribution margin and break-even revenue drops to $80,000.
Same business, three answers: $80,000, $91,000, or $106,667 a month. The gap between the optimistic version and the real one is roughly $27,000 of monthly revenue — which is the difference between a business that is fine and a business that is quietly burning while its P&L looks acceptable.
Three versions, and when each matters
Accounting break-even
The calculation above. Useful for pricing and capacity decisions, because it tells you what a unit of work needs to contribute.
Cash break-even
The one that determines whether you survive. Start with fixed costs, then add the things that consume cash but never appear as an expense: debt principal, tax reserves, capital purchases. Subtract depreciation, which is an expense that consumes no cash.
In the example above, adding $4,200 of monthly debt principal and $3,000 of tax reserve takes fixed costs to $55,200 and cash break-even to about $122,667 — roughly $16,000 a month above the accounting figure. A business sitting between those two numbers is profitable and losing cash at the same time, which is a genuinely confusing place to be if you do not know the two numbers are different.
Owner break-even
What the business must produce to cover fixed costs, cash obligations, and the distributions you actually rely on. This is the number most owners are really asking about when they ask about break-even, and almost nobody calculates it.
The more useful framing: break-even as a date
A monthly break-even figure is a static answer to a question that moves. The version that changes behaviour is temporal: which day of the month do we cross it?
If break-even is $106,667 and you bill roughly evenly, you cross it around the 22nd. Everything before that pays for the business existing; everything after is margin. Owners who know that date tend to run the back end of the month differently — it turns an abstraction into something you can watch.
It also makes the risk legible. If you cross break-even on the 22nd, you have eight days of margin. Lose one large client and the date moves to the 27th, and you are now three days from working for nothing.
What it should change
- Discounting. At a 45% contribution margin, a 10% discount does not cost you 10%. It costs you 22% of the contribution on that job. Discount authority should be set against contribution, not revenue.
- Pricing floors. Any engagement below your contribution margin threshold makes the business busier and no better off. Knowing the floor makes those easy to decline.
- Hiring. A new fixed cost raises break-even immediately and permanently. Work out the new number before the offer, not after.
- Capacity. If break-even requires 18 engagements and the team can deliver 20, you have a 10% buffer. That is a structural fact about the business, and it is worth knowing whether it is 10% or 40%.
It moves, so recalculate it
Break-even drifts upward almost without exception. Every subscription, every raise, every lease renewal adds fixed cost, and each individual increment is too small to notice. Recalculate quarterly, and recalculate immediately after any hire or any change to your pricing or delivery model.
If you only do this once a year, the number you are working from is reliably too low, and it is too low at exactly the moment you are making commitments against it.
Run it on your numbers
The break-even calculator takes fixed costs, average deal size and direct cost, and returns the units and revenue you need. No email required.
If the answer surprises you, the usual culprit is contribution margin rather than fixed costs. That is worth chasing down properly, because the same error will be sitting inside your unit economics and your pricing.
