Break-even analysis for small businesses: the contribution-margin view

Learn how fixed costs, variable cost and selling price determine the unit volume required to break even.

Editorial review: Oct 15, 2026 · Educational content · No sponsored recommendations

Separate fixed and variable costs

Fixed costs continue even if you sell zero units—rent, core salaries or certain subscriptions. Variable costs rise with each unit—materials, packaging, per-unit commissions or shipping. Misclassifying costs distorts the break-even point.

Contribution margin pays the fixed bills

Selling price minus variable cost is contribution margin per unit. Each sale contributes that amount toward fixed costs. After fixed costs are covered, additional contribution becomes operating profit before other items.

Discounts change break-even quickly

A small price reduction can cause a large increase in required volume when contribution margin is already thin. Model the actual average realized selling price, not just the list price.

Capacity matters

A mathematical break-even point may be impossible if your factory, staff or delivery system cannot produce that many units. Compare break-even volume with real operating capacity.

Use scenarios before commitments

Stress-test raw-material increases, price pressure and higher fixed expenses. A business with plenty of room between expected sales and break-even is generally more resilient than one operating just above it.

Related calculators