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Break-even analysis estimates the sales level at which total revenue equals total cost. At break-even, the business is not generating an operating profit under the assumptions used, but it is covering the costs included in the calculation.
Fixed costs
Fixed costs are costs that do not change directly with sales volume over the period being analyzed. Examples can include rent, some salaries, insurance, and certain software subscriptions.
Variable costs
Variable costs rise or fall with units sold or services delivered. Examples can include product cost, transaction fees, packaging, shipping tied to sales, or direct materials.
Contribution margin
The amount left from each sale after variable cost is the contribution margin.
Contribution margin per unit = selling price − variable cost per unit.
That contribution first covers fixed costs; sales beyond break-even can contribute to profit, assuming the cost structure holds.
Example in units
Suppose a business has:
- $6,000 monthly fixed costs,
- $50 selling price per unit, and
- $20 variable cost per unit.
Contribution margin is $30 per unit. Break-even volume is:
$6,000 ÷ $30 = 200 units.
Under these assumptions, selling 200 units covers the modeled fixed and variable costs.
Break-even in sales dollars
SBA also expresses break-even in sales dollars using contribution margin. A common form is:
Break-even sales = fixed costs ÷ contribution margin ratio.
The contribution margin ratio equals contribution margin per unit divided by selling price per unit.
Why break-even is useful
- Testing whether a price supports the cost structure.
- Estimating how much sales volume is needed.
- Comparing alternative pricing or cost scenarios.
- Evaluating whether fixed-cost expansion is realistic.
- Preparing lender or investor planning materials.
Why the calculation can mislead
Break-even analysis assumes the inputs are reasonably stable. Real businesses may have multiple products, discounts, changing input costs, capacity limits, seasonal demand, step-fixed costs, and semi-variable expenses.
The SBA notes that break-even is an estimate and should not be treated as a perfect prediction of accounting results.
Multiple products make the math harder
If a business sells products with different contribution margins, the sales mix matters. Selling more low-margin items can raise the number of units required to cover fixed costs even when total unit volume looks strong.
Do not confuse break-even with cash break-even
Accounting break-even and cash needs can differ because loan principal, equipment purchases, receivables, inventory timing, taxes, and depreciation can affect cash differently from income-statement profit.
A practical scenario process
- Calculate a base case.
- Test a lower sales price.
- Test higher variable costs.
- Test higher fixed costs.
- Stress-test a lower sales volume.
- Review the result alongside a cash-flow forecast.
Continue learning
Visit the Business & Entrepreneurship hub and read Cash Flow Explained.
Sources & methodology
This article is educational and does not replace individualized accounting, tax, or financial advice.
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Sources, dates, and methodology matter.
EconomicHQ prioritizes primary sources for consequential financial and economic claims and identifies reporting periods for changing information. This article is educational and does not provide individualized financial, investment, tax, legal, or credit advice.