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Guide · Break-Even

Contribution Margin Income Statement: Format and Example

Build a contribution margin income statement, see how it differs from the traditional gross-profit format for the same month, and use it to answer what-if questions about volume.

By PriceAndProfit Editorial Updated 3 min read

On this page
  1. The format
  2. Worked example: one month, two formats
  3. Answering a what-if question

A contribution margin income statement sorts the costs of a period by behavior instead of by function. All variable costs — production and selling alike — come first and are subtracted from sales to give the contribution margin. Fixed costs come after, and what remains is operating income. It is an internal management report: the statements a business files or shows to lenders use the traditional format, but the contribution format is the one that answers "what happens if we sell more, or less?"

The format

  1. Sales

    Units sold × price per unit.

  2. Less variable costs

    Units sold × variable cost per unit, including variable selling costs such as fees, shipping and commissions.

  3. Contribution margin

    Sales minus variable costs, often shown with its ratio to sales.

  4. Less fixed costs

    Fixed production overhead plus fixed selling and administrative costs for the period.

  5. Operating income

    Contribution margin minus fixed costs, before interest and income taxes.

Worked example: one month, two formats

A hypothetical small manufacturer sells 2,000 units at $40. Each unit carries $14 of variable production cost and $6 of variable selling cost. Fixed production overhead is $15,000 for the month and fixed selling and administrative cost is $6,000. Everything produced this month is sold, so there is no change in inventory.

The same month in both formats
Contribution formatAmountTraditional formatAmount
Sales $80,000 Sales $80,000
Variable production costs −$28,000 Cost of goods sold ($28,000 variable + $15,000 fixed) −$43,000
Variable selling costs −$12,000 Gross profit $37,000
Contribution margin (50%) $40,000 Selling and administrative ($12,000 variable + $6,000 fixed) −$18,000
Fixed costs ($15,000 + $6,000) −$21,000
Operating income $19,000 Operating income $19,000

Both columns reach the same $19,000, but they show different middle lines. Gross profit of $37,000 mixes a fixed cost ($15,000 of overhead) into cost of goods sold and leaves a variable cost ($12,000 of selling cost) below it. The contribution margin of $40,000 contains every variable cost and nothing else, so it moves exactly in step with volume.

Answering a what-if question

Suppose sales rise 10% to 2,200 units at the same price and costs. In contribution format the answer is immediate: contribution rises 10% to $44,000, fixed costs stay at $21,000, and operating income becomes $23,000 — up $4,000, or 21%. Trying the same with the traditional statement by scaling gross profit 10% would give $40,700, minus selling and administrative costs scaled the same way, and the answer would be wrong because part of each cost line is fixed. With $21,000 of fixed costs and a 50% ratio, break-even sales are $42,000, or 1,050 units.

Two boundaries are worth keeping. When production and sales differ, the traditional (absorption) statement carries part of the fixed overhead in inventory, so its operating income can differ from the contribution format for the same month. And classify each cost by how it actually behaves in your business, splitting mixed costs first; a cost left in the wrong group shifts the contribution margin and every what-if built on it.

Method references: OpenStax: Explain Contribution Margin; SEC: Beginners' Guide to Financial Statements. Checked October 26, 2026. All figures are hypothetical.

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