What it means
A manufacturer buys inputs, applies labour and equipment, and sells something worth more than the parts it started with. That sounds simple, but it creates an accounting problem that service businesses never face: at any moment the company owns partly finished goods whose cost has to be tracked and valued.
Manufacturing accounting splits product costs into three buckets. Direct materials are the physical inputs traceable to the product, direct labour is the wages of people who build it, and manufacturing overhead covers everything else in the factory, such as machine depreciation, factory rent, supervision and utilities.
Costs outside the factory, such as sales commissions and head office salaries, are period costs and are expensed straight away. Inventory moves through three stages: raw materials, work in progress, and finished goods.
Cash is consumed at the first stage and only recovered when a finished item is sold and collected, which is why manufacturers are usually far more working-capital hungry than software or consulting businesses. The measure that matters most to operations is capacity utilisation, because factory overhead is largely fixed.
Running a plant at 90% of capacity spreads that overhead across many more units than running it at 55%, so unit costs fall sharply as volume rises. This is also why manufacturers are tempted to overproduce, since building inventory temporarily flatters reported profit by parking overhead in the balance sheet.
Modern manufacturing spans a wide range of models, from vertically integrated plants that make almost everything in house to contract manufacturers that build to another company's design. Many businesses that describe themselves as brands own no factories at all and outsource production entirely, which converts a large block of fixed cost into a variable purchase price.
In practice
Real-world examples.
Example
A food producer buys $1.2 million of ingredients and packaging in a year and finishes the year with $180,000 of half-mixed batches in work in progress. Its accountant confirms that the labour and factory overhead absorbed into those batches sits on the balance sheet, not in the profit and loss account.
Example
An electronics start-up decides not to build a plant and signs with a contract manufacturer at $38 per unit. It swaps an estimated $4 million of factory investment for a fully variable cost, which protects cash but leaves it with a thinner margin per unit.
Example
A packaging firm running at 55% capacity absorbs $2 million of annual factory overhead across 400,000 units, or $5 per unit. After winning a contract that lifts volume to 800,000 units, the same overhead falls to $2.50 per unit and the gross margin improves without any change in selling price.
Formula
Calculation
The core manufacturing calculation is cost of goods manufactured: Cost of Goods Manufactured = Opening Work in Progress + Direct Materials Used + Direct Labour + Manufacturing Overhead - Closing Work in Progress.
Take a fictional furniture plant for one quarter. Direct materials used are $300,000, direct labour is $180,000, and manufacturing overhead is $120,000, so total manufacturing costs for the period are $300,000 + $180,000 + $120,000 = $600,000.
Opening work in progress was $40,000 and closing work in progress is $60,000. Cost of goods manufactured is therefore $40,000 + $600,000 - $60,000 = $580,000. If the plant completed 29,000 chairs in the quarter, the average manufactured cost per chair is $580,000 / 29,000 = $20.00, and that $20 stays in finished goods inventory until each chair is actually sold.Case study
Seen in the real world.
Consider Brightmoor Tools, an illustrative and entirely fictional maker of garden equipment. Brightmoor's factory carried $2.4 million of annual overhead and produced 120,000 units a year, so each unit absorbed $20 of overhead on top of $34 of materials and labour, giving a manufactured cost of $54 against an average selling price of $80.
Demand softened and sales fell to 90,000 units, but the production manager kept the line running at 120,000 to keep unit costs looking healthy. Reported gross profit held up because 30,000 units of overhead-laden inventory moved onto the balance sheet rather than through the profit and loss account, yet cash fell by roughly $1.6 million as materials were bought for goods nobody had ordered.
The finance director eventually cut output to match demand, which pushed the overhead absorbed per unit from $20 to $26.67 and made the reported margin look worse before it looked better. The illustrative point is that manufacturing profit and manufacturing cash can move in opposite directions, and inventory is where the two part company.
Watch out
Common mistakes.
- Treating all factory spending as an immediate expense. Direct materials, direct labour and factory overhead attach to inventory and only hit profit when the goods are sold.
- Assuming higher production always improves profitability. Building goods nobody has ordered consumes cash and simply defers the overhead into inventory.
- Including selling and administrative costs in manufacturing overhead. Only costs incurred inside the production facility belong there, and mixing them in distorts unit cost.
Questions
People also ask.
What is the difference between cost of goods manufactured and cost of goods sold?
Cost of goods manufactured is the cost of items finished in the period, while cost of goods sold is the cost of items actually sold, which differs whenever finished goods inventory changes.
Why do manufacturers need so much working capital?
Cash goes out for materials, labour and overhead long before a customer pays, so money is tied up across raw materials, work in progress, finished goods and receivables at the same time.
Is contract manufacturing cheaper than owning a plant?
It is usually cheaper in cash terms at low volume because it avoids fixed investment, but at high volume an owned plant can produce at a lower unit cost.
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