Direct costing is the product costing method under which only the variable manufacturing costs enter the cost of a unit, and the whole of fixed manufacturing overhead is charged against the period in which it is incurred rather than carried in inventory. US material more often calls it variable costing, and UK and Commonwealth material calls it marginal costing. Those are three surface forms of one method, and none of them is a statement about direct costs.
Direct Costing Is Not About Direct Costs
The name points at the wrong axis. Direct costing sorts costs by behavior, whether a cost moves when output moves, and uses that answer to decide what belongs in a unit’s cost. A direct cost is a traceability classification, an answer to which cost objective, meaning the product, contract or client engagement, a cost was incurred for. The crossing cases show these are different questions: a supervisor assigned full time to one contract is direct and fixed, while factory electricity is variable and indirect. Direct costing keeps the electricity in unit cost and sends the supervisor’s salary to the period, the reverse of what a traceability test does. That classification, and the federal wording behind it, is in direct cost.
What Goes Into a Unit
Three layers, each one a cost that moves with output, and the fourth layer that absorption costing adds is left out on purpose.
Direct costing unit cost = direct materials
+ direct labor
+ variable manufacturing overhead per unitFixed manufacturing overhead becomes a charge of the period that incurred it, the attachment question settled in period vs product cost, and the rate machinery that would otherwise put it onto units is in costing overheads.
Where It Agrees With Absorption Costing and Where It Does Not
Both methods read the same data and differ only in where fixed manufacturing overhead sits. Production equal to sales gives the same operating income under either, because the period defers no more fixed overhead into inventory than it releases from it. They part company the moment production and sales diverge.
Fixed manufacturing overhead for the period $200,000
Normal capacity, and units produced 10,000 units
Fixed overhead per unit 200,000 / 10,000 = $20
Units sold 8,000 units
Absorption costing, fixed overhead reaching income
8,000 x 20 = $160,000
Direct costing, all fixed overhead charged to the period
= $200,000
Difference, waiting in the 2,000 unsold units = $40,000For external reporting that fixed layer cannot be left out, so direct costing stays a management view and is never the basis of the reported inventory figure. The standard and the tax regulation behind that are in absorption costing.
Marginal Costing Is Not Marginal Cost
Marginal costing is another name for this method. Marginal cost is a measure, the change in total cost from one more unit, and the two travel together only because a unit’s variable cost is usually what the next unit adds.
Where a US Firm Meets It
In practice this shows up in management reporting and pricing analysis for a client, not in that client’s financial statements and not on the return. The reports it feeds are contribution format, laid out in the contribution margin income statement, and it drives the break-even work in cost volume profit analysis. A manufacturing client reporting internally on a variable basis needs fixed manufacturing overhead put back into inventory before the year-end figures and the tax computation are prepared. Pricing carries the opposite risk, since a direct costing unit cost leaves out the fixed costs of capacity that some price still has to recover.
Common Questions
Costing a unit on its variable manufacturing costs alone and treating all fixed manufacturing overhead as a cost of the period. It is an internal decision tool, also called variable costing or marginal costing.
Materials that become part of a specific product, the wages for hours worked on one job, a subcontractor hired for a single project. Those are examples of a cost type, not of this method.
A direct cost is identified with one cost objective and charged straight to it. An indirect cost serves more than one objective, so it is pooled and recovered across all of them. The test is in direct costs versus indirect.
A direct cost belongs to a single cost objective. Overhead is what is left once the direct charges have been made, recovered through a rate, and it is set out in overhead. Direct costing cuts that pool again, by behavior, keeping the variable part in unit cost.
Accountably places trained offshore accountants and tax preparers inside US CPA and EA firms, and a trial task lets a firm’s own reviewer grade real work before any client file moves.
