Business Financing Encyclopedia · Financial planning
Business break-even point: calculation, worked example and margin of safety
Higher revenue does not always mean higher profit. Break-even analysis shows how much you need to sell to cover costs, how a discount affects profitability and how far sales can fall before the business makes an operating loss.
27 October 2026 · Practical guide · 10 min read
What this guide covers
- Break-even formulas for revenue and units sold.
- A worked example showing how a 10% discount eliminates operating profit at the same sales volume.
- An interactive calculator for break-even revenue, margin of safety and the sales required to achieve a target profit.
What is a business break-even point?
It is the level of sales at which revenue equals the costs included in your model. Above that level, the business generates a profit; below it, a loss. You can express the threshold as revenue or as units, such as products, orders or billable hours. The SBA guide to break-even analysis explains this approach.
This article calculates an operating break-even point before interest and income tax. Revenue, costs and target profit all relate to the same month and business scope. To assess profit after interest or tax, you need to extend the model. The operating result calculated here should not be described as net income.
The threshold is useful when budgeting, reviewing prices, launching a business line or assessing resilience. It is not a universal lender requirement and does not guarantee funding approval.
Separate fixed costs from variable costs
Classify costs by how they respond to sales volume within the activity range you are analyzing. A direct cost is not necessarily variable, and an indirect cost is not necessarily fixed. The economic relationship matters more than the accounting label.
| Category | Behavior | Possible example |
|---|---|---|
| Fixed | The total stays unchanged over the period within existing capacity. | Rent, fixed salaries and depreciation of assets in use. |
| Variable | The total changes with sales volume. | Purchase cost of goods sold, packaging per order and sales commissions. |
| Mixed | Includes both fixed and variable components. | Delivery service with a subscription fee and a charge per shipment. |
| Step costs | Increase when the business moves to a higher capacity level. | An additional shift or a second warehouse above a volume threshold. |
Split mixed costs into their fixed and variable components. Model step costs separately for each capacity range. Check intermediary fees, returns and order fulfillment costs: leaving out costs that rise with sales will overstate profit.
For a profit-based model, use consistent revenue and expense recognition policies. Buying inventory is not the same as recognizing the cost of goods sold. Align tax and indirect tax treatment with the accounting basis you use; do not mix revenue on one basis with costs on another. The basic calculation below assumes no material change in inventory.
Break-even formulas and worked example
Contribution is revenue less variable costs. It first covers fixed costs; the remainder is operating profit. The contribution margin ratio is not markup: markup is measured against cost, while the contribution margin ratio is measured against revenue. Gross profit may also differ from contribution, depending on how costs are classified.
Contribution per unit = selling price − variable cost per unit.
Contribution margin ratio = (revenue − variable costs) / revenue.
Break-even units = fixed costs / contribution per unit.
Break-even revenue = fixed costs / contribution margin ratio.
Use the ratio as a decimal in the last formula: 40% = 0.40. Round required volumes up when units cannot be divided.
Consider a hypothetical business selling a single product. All amounts are in one currency and cover one month. Use your reporting currency when applying the model; no currency conversion is implied. These figures illustrate the method and are not results from an NG Finance client.
| Metric | Value | Calculation |
|---|---|---|
| Fixed operating costs | 1,200,000 | Per month |
| Price / variable cost per unit | 1,000 / 600 | Contribution per unit: 400 |
| Contribution margin ratio | 40% | 400 / 1,000 |
| Break-even volume | 3,000 units | 1,200,000 / 400 |
| Break-even revenue | 3,000,000 | 1,200,000 / 0.40 |
| Planned sales | 4,000 units | Revenue: 4,000,000 |
| Planned operating profit | 400,000 | 4,000,000 × 0.40 − 1,200,000 |
Margin of safety
This is the difference between planned or actual revenue and break-even revenue. In the example, it is 1,000,000, or 25% of planned revenue: (4,000,000 − 3,000,000) / 4,000,000. With the same underlying economics, revenue could fall by that amount before operating profit reaches zero. This is not a cash balance or a bank reserve.
Revenue required for a target profit
Required revenue = (fixed costs + target operating profit) / contribution margin ratio. To earn 600,000 under the same assumptions, the business needs revenue of 4,500,000, or 4,500 units. Check that capacity can support that volume without additional fixed costs.
How a 10% discount can eliminate profit
Reduce the price from 1,000 to 900. Variable cost remains 600 per unit and fixed costs remain 1,200,000. Contribution per unit falls from 400 to 300. At the same volume of 4,000 units, revenue is 3,600,000 and operating profit falls to zero: 4,000 × 300 − 1,200,000 = 0.
To preserve the previous profit of 400,000, the business needs to sell at least 5,334 whole units: (1,200,000 + 400,000) / 300, rounded up. That requires roughly a one-third increase in volume, rather than 10%. The discount alone does not establish that demand exists, and higher throughput may require additional spending.
Before running a promotion, compare volume, contribution, capacity and payment timing across scenarios. More sales on credit terms can also increase working capital needs.
Business break-even calculator
Enter amounts for the same period in the same currency. Variable costs are entered as a percentage of revenue. The calculator assumes a constant variable cost ratio, an unchanged sales mix and sufficient capacity. Results are before interest and income tax.
Amounts: 0 to 1 billion. Variable cost ratio: 0% to 99.99%. Change any input to update the results. Calculations are estimates; amounts are rounded to two decimal places.
Planned revenue is above break-even.
For a cost sensitivity check, increase the variable cost ratio from 60% to 65% and leave the other inputs unchanged. Operating profit falls to 200,000, break-even revenue rises to approximately 3,428,571.43 and the margin of safety falls to approximately 14.29%. This lets you assess the effect of higher purchase costs or commissions.
Putting break-even analysis to work
When you sell several products or services
Calculate total contribution for the planned sales mix and divide it by total revenue. Use that weighted contribution margin ratio to calculate the company-wide threshold. Recalculate it when the mix changes: the same revenue from different products can produce different profits. The ACCA guide to cost-volume-profit analysis discusses the limitations of a changing sales mix.
When demand is seasonal or capacity changes
Do not automatically divide annual costs by 12. Build a monthly plan that captures low-season costs and the timing of expansion. If the target sales level requires a second warehouse, recalculate break-even with that cost included. Review each critical month as well as the annual total.
When the business is profitable but short of cash
A break-even calculation does not bring customer collections, inventory purchases, debt principal repayments, capital expenditure and owner distributions into a single liquidity schedule. A profit-based model may include depreciation, which is not a current cash payment. Pair it with a 13-week cash flow forecast. Borrowing may bridge a timing gap, but it does not fix a negative contribution margin.
Checks before making a decision
- Reconcile the inputs to management accounts for several comparable periods.
- Check realized prices after discounts and actual variable costs.
- Confirm that fixed costs reflect the capacity level being modeled.
- Compare base and downside scenarios for both profit and cash flow.
- Set a review date and assign an owner to each material assumption.
Frequently asked questions
Does the method work for service businesses?
Yes. The unit can be an order, project or billable hour. Check actual utilization, variable costs and team capacity. For a mix of project types, a weighted contribution margin ratio may be more useful.
Can a business break even with zero contribution?
With positive fixed costs, there is no finite break-even point: sales do not contribute toward those costs. A negative contribution means that higher volume increases the loss if the underlying economics stay unchanged. Review pricing, costs or the product first. The calculator does not model these cases.
Why is the margin of safety negative?
Planned revenue is below break-even. The negative value measures the relative gap to that threshold; it is not a buffer for a further decline. At zero revenue, the percentage is undefined, so the calculator does not display it.
Should loan payments be included in fixed costs?
This operating model excludes interest by definition. Repayment of loan principal is not an operating expense, but it does require cash. To assess debt service, prepare a separate cash forecast that includes interest, fees and principal repayments.
What is a good margin of safety?
There is no single percentage suitable for every business. Assess it alongside seasonality, price volatility, customer concentration, cost flexibility and available liquidity.
When to bring in financial analysis support
If revenue is growing but profits remain weak, your sales mix is changing or business-unit numbers do not reconcile, start with the underlying data and business economics. NG Finance works with companies worldwide to analyze contribution margins, costs, cash flow and debt obligations.
Company financial analysis is available as a standalone service, with scope and deliverables agreed around your objectives and available data. For an initial discussion, prepare a profit and loss statement, sales by business line, a cost breakdown and a debt schedule. Any financing options depend on the country, company documentation and lender requirements.
Discuss your company's financial analysisRelated reading
Sources and review date
Reviewed on 27 October 2026. The formulas were checked against the primary educational sources below. The worked example, scenarios, calculator and practical recommendations were developed by NG Finance. They do not replace analysis based on a company's own financial data.