Small transaction fees can change your break-even point.
Calculate the contribution that remains after variable costs and payment fees.
Contribution pays your fixed costs
The SBA's break-even framework divides fixed costs by unit contribution: price less variable cost. For a useful business model, payment fees belong in the variable-cost picture rather than disappearing from the calculation.
Compare the same offer with and without fees
Suppose monthly fixed costs are $2,000, unit price is $50, and variable unit cost is $20. With no payment fees, contribution is $30 and the minimum whole-unit break-even volume is 67 sales.
Now add a hypothetical 3% payment fee and a $0.30 flat fee, with one unit per transaction. Contribution becomes $50 − $20 − $1.50 − $0.30 = $28.20. Minimum whole-unit break-even rises to 71 sales. These fee values are examples, not a recommendation or a provider quote.
| Model | Contribution | Minimum whole units |
|---|---|---|
| No fees | $30.00 | 67 |
| Entered example fees | $28.20 | 71 |
Allocate the flat fee honestly
If the average transaction contains two units, allocate the flat fee across those two units. The model assumes that the same order mix holds as volume changes. It does not predict changes in demand or customer behavior.
Separate break-even from payback
Covering monthly costs is different from recovering a startup investment. The tool shows static payback only when modeled monthly operating profit is positive, assuming steady sales. Taxes, financing, and ramp-up are excluded.
If contribution is zero or negative, increasing volume cannot produce positive operating break-even with positive fixed costs. Review price and variable costs first. A worked example is a planning aid, not a revenue forecast.
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Before using the result
Check that fixed costs, prices and sales use the same period. Test a lower sales volume and a higher variable cost separately. A mathematically possible break-even point does not establish customer demand, available capacity or financing suitability.
Sources & review
Put the explanation to work.
Use business break-even to explore your own assumptions.
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