The glossary to understand and take action

Contribution margin

Difference between sales and costs that vary with the level of activity, under the management model used.

Notion comptable, fiscale ou juridique · Luxembourg Fiduciaries Editorial Team · Reviewed on

Understand the scope

Definition and points to distinguish

This margin contributes to covering fixed costs. Its rate is used, in particular, to calculate a break-even point, provided that the assumptions remain consistent over the period and volume considered. It must be distinguished from other margins relating to a different cost scope.

In your file

What this changes in practice

Contribution margin is revenue less the costs that vary with activity under the model used. It contributes to covering fixed costs and then generating a result. The fixed-variable distinction must be justified and may depend on the time horizon considered. This benchmark is used to compare scenarios, but does not replace either the full accounting margin or a cash-flow plan.

A scenario to help you understand

Educational example

A manufacturer compares two production volumes by isolating materials and other variable costs, then measures the coverage of its fixed costs.

Fictitious situation, presented to illustrate the concept.

Prepare for what comes next

Points to check

  • Définir le périmètre des coûts
  • Justifier leur comportement
  • Relier la marge au volume d’activité

The practical question

Find out more

Comment lire une marge sur coûts variables dans un exemple simple ?

Dans un exemple fictif, 100 euros de ventes et 60 euros de coûts variables donnent 40 euros de marge sur coûts variables. Ces 40 euros servent encore à couvrir les coûts fixes : ils ne représentent pas automatiquement le bénéfice. Le calcul doit préciser les coûts inclus et rester cohérent avec le volume et la période étudiés.

Connecting concepts

Terms to know as well

Continue with the concepts, contacts and procedures related to this topic.

Break-even pointThe break-even point is the level of activity at which revenue covers the costs included in the calculation model.Budget varianceDifference between an actual value and the budgeted value for the same scope and period.Financial forecastThe financial forecast translates the project's assumptions into expected results, cash flows and financing needs.Income statementThe income statement, also called the profit and loss account in Luxembourg accounts, matches income and expenses for a period.InventoryGoods tracked in the operating cycle, particularly for sale, processing or consumption in production.Balance sheetThe balance sheet presents, at a given date, the company's assets and the resources or obligations financing them.

Put it into practice

Explore further with our guides

Practical guideReading the profit and loss account: explaining business performancePractical guideBreak-even point: build a calculation and test assumptionsPractical guideBudget and actuals: analysing variances in a dashboard

Sources and verification

References consulted on 20 September 2026. Official procedures specify the applicable conditions and exceptions.

This guide explains a general process. The applicable rules depend on your situation; it does not constitute personalised advice. Report a correction.

A definition gives you a reference point. To examine your situation, clarify your question with a professional.