Break-Even Analysis: The Number Every Small Business Owner Should Know
Ask a struggling business owner how many sales they need each month simply to cover costs, and a surprising number don't know. It's the most clarifying number in small business, it takes ten minutes to work out, and it turns vague anxiety about whether things are working into a specific, checkable target.
The short version
- Break-even units = Fixed costs ÷ (Price − Variable cost per unit)
- The denominator is your contribution margin — what each sale contributes toward fixed costs.
- Fixed costs don't change with sales volume; variable costs are incurred per sale.
- Raising price lifts contribution margin directly, which lowers break-even faster than cutting costs usually can.
Splitting your costs correctly
Everything hinges on classifying costs properly, and this is where most people go wrong.
Fixed costs stay the same whether you sell ten units or a thousand: rent, salaries for permanent staff, insurance, software subscriptions, loan payments, accounting fees, your own base draw.
Variable costs are incurred per sale: materials, the wholesale cost of goods, payment processing fees, packaging, outbound shipping, sales commission, per-unit direct labour.
Some costs are genuinely mixed — utilities, part-time hourly staff whose hours flex with demand. Split them if you can estimate the split sensibly; if not, treat them as fixed. That errs toward a conservative break-even, which is the safer direction to be wrong in.
Worked example: a small print shop
Fixed costs per month: rent $2,200, insurance $150, software $120, equipment lease $530, owner's base draw $2,000 = $5,000.
Per custom t-shirt: price $35, variable cost $17.72 (blank, ink, press labour, processing, packaging).
Contribution margin = $35 − $17.72 = $17.28 per shirt (49.4% of price).
Break-even = $5,000 ÷ $17.28 = 290 shirts per month, or about $10,150 in revenue.
That's roughly 13 shirts per working day. Now the owner has something concrete to check the business against every single day, rather than waiting for a monthly bank balance to deliver bad news.
Run your own numbers, including a target profit on top of break-even.
Open the break-even calculatorBreak-even for a target profit
Break-even means covering costs — a business that only breaks even is a job that pays nothing extra. To find the volume for an actual profit, add the target to fixed costs:
Units = (Fixed costs + Target profit) ÷ Contribution margin
Our print shop wanting $3,000 monthly profit above the owner's draw: ($5,000 + $3,000) ÷ $17.28 = 463 shirts. That's the real target. Break-even is the floor; this is the goal.
Using it to make decisions
Should I raise prices?
This is where contribution margin shows its power. Raise the shirt price from $35 to $39 — an 11% increase. Contribution margin goes from $17.28 to $21.28, up 23%. Break-even drops from 290 shirts to 235.
You could now lose 19% of your customers and still be no worse off. Because the price increase falls entirely into contribution margin while variable cost is unchanged, modest price rises have leverage that's hard to match by any other means.
Can I afford to hire?
A part-time employee at $2,000/month raises fixed costs to $7,000. New break-even: $7,000 ÷ $17.28 = 405 shirts — 115 more per month than before, about 5 extra per working day. The question becomes concrete: will this hire enable at least 115 additional shirts a month, or free up enough of your time to produce them? That's answerable in a way that "can I afford someone?" never is.
Is this equipment worth buying?
Equipment usually raises fixed costs while lowering variable ones. A $500/month press that cuts variable cost from $17.72 to $14.50: fixed becomes $5,500, contribution margin becomes $20.50, break-even = 269 shirts. Lower than the current 290, so it pays off — but only if you reliably sell above roughly that level. Below it, the higher fixed cost hurts more than the savings help. This is operating leverage, and it's why capital investment is risky for businesses with volatile sales.
Should I take this large discounted order?
Once fixed costs are already covered by your regular sales, any order priced above variable cost adds profit. A 200-shirt order at $24 each looks bad against a $35 list price, but contributes ($24 − $17.72) × 200 = $1,256 straight to the bottom line — provided it doesn't displace full-price work or reset customer expectations. That last caveat matters: repeated discounting teaches clients your real price.
Break-even for service businesses
The unit is a billable hour or a project. Say a consultant with $3,500 in monthly fixed costs (office, software, insurance, professional fees) bills $95/hour with $10/hour of direct costs. Contribution margin is $85. Break-even: 3,500 ÷ 85 = 42 billable hours per month.
The critical adjustment for service businesses is that billable hours are far fewer than working hours. Sales, admin, quoting, invoicing and unpaid revisions typically consume 40–50% of the week. Forty-two billable hours may well require 80 hours of actual work — which is exactly why hourly rates that seem high compared to salaries often aren't.
The mistakes that matter
- Forgetting to pay yourself. If your own living costs aren't in fixed costs, your break-even is fiction. A business that can't cover the owner's income isn't breaking even — it's subsidised by you.
- Understating variable costs. Payment processing, breakage, returns and shipping are quietly significant. Missing them inflates contribution margin and hides the real break-even.
- Treating it as a one-time exercise. Rent rises, suppliers reprice, wages change. Recalculate at least twice a year.
- Assuming a single product mix. With varied products, calculate a weighted average contribution margin based on your actual sales mix, or run break-even per product line.
- Confusing profit with cash. Break-even is an accounting concept. You can pass break-even and still run out of money if clients pay slowly — which is why invoicing discipline matters as much as pricing.