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Last reviewed September 2026

Glossary

Contribution margin

Contribution margin is what one job or customer contributes toward fixed costs after its own variable costs are paid: price minus variable cost. It answers a narrower question than gross margin, which is whether a particular piece of work is worth taking at all. Anything with a positive contribution helps pay the rent.

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The number to use when deciding whether to take the work

Not a Scorecard row. Contribution margin is a decision tool, pulled out when the team is arguing about a price, a product line or a customer nobody enjoys serving. What can sit on the weekly board is the mix: the share of jobs booked this week below an agreed price floor, owned by whoever signs off on pricing.

Companies drop work that looks unprofitable once fixed costs are spread across it, then discover the overhead did not leave with the customer. Contribution margin asks the sharper question: if this job disappears tomorrow, what money disappears with it? The answer is often smaller than the allocation suggested, and the work turns out to be worth keeping at a better price.

Worked example: A small foundry considered dropping short-run castings, which showed a loss once factory overhead was spread over them. Contribution per furnace hour was positive on every one, and the furnace sat idle three days a week. They kept the work, raised prices by eight percent, and lost two customers out of nineteen.

Sources: klipfolio.com/kpis/financial; Principles of Accounting, Volume 2: Managerial Accounting, section 3.1, OpenStax

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