Absorption Costing
A costing method that assigns all manufacturing costs, fixed and variable, to units produced, and is required for external inventory reporting.
Under absorption costing, each unit carries direct materials, direct labor, variable overhead and a share of fixed manufacturing overhead. Fixed overhead is held in inventory until the units are sold, so profit can change when production and sales differ. Financial reporting under U.S. GAAP and IFRS uses absorption costing for inventory.
Variable costing, by contrast, expenses fixed manufacturing overhead in the period incurred and values inventory at variable cost only. Managers often use it for pricing and volume decisions because it shows the contribution each unit makes.
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Open the calculator →What absorption costing includes
Under absorption costing, every unit produced absorbs a share of all manufacturing costs. That means direct materials, direct labor, variable manufacturing overhead, and a share of fixed manufacturing overhead such as factory rent, equipment depreciation and supervisor salaries.
Variable costing, the alternative, treats only variable manufacturing costs as product costs. Fixed manufacturing overhead is expensed in full in the period it is incurred. The difference sounds small, and it changes reported profit, inventory values and the signals a manager gets.
Absorption costing is required for external financial reporting under US GAAP and IFRS, because the standards value inventory at full production cost. Variable costing is used internally, since it aligns with contribution margin and cost-volume-profit analysis.
Worked example: producing more than you sell
A company produces 10,000 units and sells 8,000 at $30 each. Direct materials are $7 a unit, direct labor is $3, and variable overhead is $2, so variable manufacturing cost is $12 a unit. Fixed manufacturing overhead is $60,000. Selling and administrative costs are $2 a unit sold plus $30,000 of fixed costs.
Absorption costing spreads the $60,000 across the 10,000 units produced, so each unit carries $6 of fixed overhead and a unit costs $12 + $6 = $18.
| Absorption costing | Amount |
|---|---|
| Sales (8,000 × $30) | $240,000 |
| Cost of goods sold (8,000 × $18) | ($144,000) |
| Gross margin | $96,000 |
| Selling and administrative ($16,000 variable + $30,000 fixed) | ($46,000) |
| Net income | $50,000 |
| Variable costing | Amount |
|---|---|
| Sales (8,000 × $30) | $240,000 |
| Variable cost of goods sold (8,000 × $12) | ($96,000) |
| Variable selling (8,000 × $2) | ($16,000) |
| Contribution margin | $128,000 |
| Fixed manufacturing overhead | ($60,000) |
| Fixed selling and administrative | ($30,000) |
| Net income | $38,000 |
Same company, same sales, same costs, and net income is $50,000 under one method and $38,000 under the other. The $12,000 difference is the 2,000 unsold units × $6 of fixed overhead, which absorption costing carries in ending inventory as an asset and variable costing expenses immediately.
The next year: selling more than you make
Now suppose the following year the company produces 8,000 units and sells 10,000, using up the 2,000 units left over. Fixed overhead is still $60,000, so it is $7.50 a unit on 8,000 produced and a unit costs $12 + $7.50 = $19.50. The 2,000 older units carry $18 each. Absorption cost of goods sold is 2,000 × $18 + 8,000 × $19.50 = $192,000, and variable cost of goods sold is 10,000 × $12 = $120,000.
| Year 2 | Absorption costing | Variable costing |
|---|---|---|
| Sales (10,000 × $30) | $300,000 | $300,000 |
| Cost of goods sold | ($192,000) | ($120,000) |
| Variable selling (10,000 × $2) | ($20,000) | ($20,000) |
| Fixed manufacturing overhead expensed | included above | ($60,000) |
| Fixed selling and administrative | ($30,000) | ($30,000) |
| Net income | $58,000 | $70,000 |
This time variable costing shows the higher profit, $70,000 against $58,000. Absorption costing releases the $12,000 of overhead that was stored in the beginning inventory, and it charges it to this year. The reconciliation still holds: $70,000 + $0 in ending inventory − $12,000 in beginning inventory = $58,000. Over the two years both methods total $108,000 of income (absorption $50,000 + $58,000; variable $38,000 + $70,000). Only the timing differs.
Why profit differs, and which way
The gap comes from where fixed overhead sits when production and sales don't match. The rule is straightforward:
| Situation | Higher profit under |
|---|---|
| Production greater than sales (inventory builds) | Absorption costing |
| Production less than sales (inventory falls) | Variable costing |
| Production equal to sales | Same under both |
When production exceeds sales, some fixed overhead is deferred into inventory under absorption costing and expensed in a later period. When inventory falls, the opposite happens and earlier deferred overhead is released. A useful reconciliation: variable costing income + fixed overhead in ending inventory − fixed overhead in beginning inventory = absorption costing income. Here, $38,000 + $12,000 − $0 = $50,000.
The overproduction incentive
Because absorption costing pushes overhead into inventory, a manager measured on reported profit can improve results just by producing more than the company sells. Nothing about demand has changed, but the profit has.
In the example, if the company had produced only 8,000 units, fixed overhead per unit would be $60,000 ÷ 8,000 = $7.50, all of it would flow to cost of goods sold, and income would match variable costing at $38,000. Producing 10,000 instead adds $12,000 of profit on paper while the unsold units sit in a warehouse. The extra profit is real only if those units are later sold, and meanwhile the company has spent cash making them and now pays to store them.
Companies guard against this by tracking inventory levels next to profit, judging managers on cash and turnover as well as income, and reviewing production plans against sales forecasts. See inventory carrying cost for what that surplus costs to hold.
Absorption cost per unit changes with volume
The fixed portion of unit cost depends on how many units you produce. In the example, at 10,000 units, cost per unit is $18. If production dropped to 5,000 units, fixed overhead per unit would double to $12, and unit cost would rise to $24 although nothing about the product changed.
That makes absorption cost unstable as a basis for pricing when volume swings. Firms manage this with a predetermined overhead rate based on normal capacity, so that unit cost doesn't jump with each month's output. Any difference between the overhead applied and the overhead actually incurred is underapplied or overapplied overhead, which is adjusted at period end. Read more under predetermined overhead rate, and see the cost per unit entry for the broader picture.
When to use each method
- External reporting and inventory valuation. Absorption costing. It is what financial statements and, in most cases, auditors require.
- Break-even and volume decisions. Variable costing. Contribution margin shows how each additional unit adds to profit, which is the logic behind the break-even point.
- Special orders and make-or-buy choices. Variable cost, because fixed overhead doesn't change with the decision.
- Long-term pricing. A full cost that includes overhead, so that the price recovers fixed costs over time.
- Tax. Rules on capitalizing costs into inventory can differ from book accounting, so confirm the treatment with a tax adviser.
Common mistakes
- Including selling and administrative costs in product cost. Neither method does. They are period costs.
- Reading a profit increase as improved performance. If inventory grew in the same period, part of the gain may be deferred overhead.
- Using absorption cost for a one-off order. The fixed overhead is already spent, so the $6 per unit in the example isn't a cost of taking the order.
- Allocating overhead on an unrepresentative base. Spreading overhead by units when products use very different machine time misstates each product's cost.
- Forgetting to reconcile. When internal reports use variable costing and the financial statements use absorption, reconcile the two each period so no one is surprised by the difference.
What absorption costing can't tell you
It doesn't show which costs will change if you make one more or one fewer unit, so it is a poor guide for volume decisions. It also depends on assumptions about production volume and allocation bases. Treat absorption cost as the right number for inventory and reported profit, and use variable costing and contribution margin for decisions about volume and price. The cost per unit calculator shows both views.
Frequently asked questions
Absorption costing is a method that assigns all manufacturing costs to products: direct materials, direct labor, variable overhead and a share of fixed overhead. Selling and administrative costs are treated as period expenses.
Absorption costing includes fixed manufacturing overhead in the cost of each unit, and variable costing expenses it in the period. In the example, absorption costing gives a $18 unit cost and variable costing gives $12.
Some fixed overhead is carried in the cost of unsold units and stays on the balance sheet as inventory instead of being expensed. In the example, 2,000 unsold units hold $12,000 of fixed overhead, which is the difference between $50,000 and $38,000 of income.
Yes. US GAAP and IFRS value inventory at full production cost, so external financial statements use absorption costing. Companies often use variable costing internally for decision-making.
Absorption costing is the better base for long-term prices because it includes overhead. For special orders or when there's spare capacity, variable cost is the relevant figure, since fixed overhead won't change.
Variable costing income plus fixed overhead in ending inventory, minus fixed overhead in beginning inventory, equals absorption costing income. In the example, $38,000 + $12,000 − $0 = $50,000.