Manufacturing overhead is an asset before it is an expense. The question of whether manufacturing overhead is an asset or expense has one answer under both U.S. GAAP and IFRS: indirect production costs get capitalized into inventory and sit on the balance sheet as an asset until the product sells. Only at the point of sale does that cost move to the income statement as part of Cost of Goods Sold.
What Counts as Manufacturing Overhead
Manufacturing overhead covers every production cost that isn’t direct materials or direct labor. If you can’t point to a specific unit coming off the line and trace the cost to it, the cost is overhead. These indirect costs get pooled and spread across output through an allocation process.
Three buckets fill the pool. Indirect materials are supplies consumed during production that don’t become a meaningful part of the finished product: lubricants for machinery, cleaning agents for the factory floor, disposable tools. Indirect labor is the wages of people who support production without physically building the product, like factory supervisors, maintenance crews, and quality inspectors. The third bucket is everything else inside the factory walls: depreciation on production equipment and the building, property taxes on the manufacturing facility, insurance, and the utilities powering the machinery. A single electricity bill might run both the CNC machines and the break room lights, so companies typically split shared utilities using floor space, equipment usage, or headcount.
Why It Lands on the Balance Sheet First
Accounting splits costs into two categories, and the split decides where overhead goes. Product costs attach to inventory. Period costs hit the income statement immediately. Manufacturing overhead is a product cost, which means it rides along with the physical goods until those goods are sold.
The logic is straightforward: inventory has future economic value because you expect to sell it and collect revenue. Capitalizing the full cost of creating that inventory, including overhead, keeps expense recognition aligned with the revenue it eventually generates. If you expensed all overhead the moment you paid the electric bill or cut a supervisor’s paycheck, your income statement would overstate costs in heavy-production months and understate them when shipments go out the door. Profits would swing based on production timing rather than actual business performance.
Period costs lack that future-revenue link. The CEO’s salary, corporate office rent, advertising spend, and sales commissions all support the business right now and don’t add measurable value to a physical product sitting in the warehouse. Those selling, general, and administrative expenses hit the income statement in the period they’re incurred, regardless of what happens on the factory floor.
Depreciation is the clearest illustration of the line. Depreciation on a press brake inside the factory is manufacturing overhead and gets capitalized into inventory. Depreciation on the laptops used by the accounting department is a period cost and goes straight to SG&A. Same accounting concept, different treatment, entirely because of where and how the asset is used.
This treatment isn’t optional. Both GAAP and IFRS require absorption costing for external financial reporting, meaning every unit of inventory must absorb a share of fixed manufacturing overhead, not just variable costs. Under IAS 2, the cost of inventory explicitly includes “costs of conversion,” defined as direct labor plus production overhead, both fixed and variable. The standard requires that fixed production overhead be allocated based on normal production capacity.1IFRS. IAS 2 Inventories Variable costing, which excludes fixed overhead from inventory and expenses it immediately, is a useful internal management tool, but it doesn’t meet the requirements for external financial statements under either framework.
How Overhead Moves From Asset to Expense
Overhead follows a specific path through three accounts before it ever becomes an expense.
First, overhead costs accumulate in a temporary holding account as they’re incurred throughout the period. The company then allocates these pooled costs to Work-in-Process inventory using a predetermined rate. At this stage, overhead joins direct materials and direct labor as part of the asset value of partially completed goods.
When production finishes, the total accumulated cost transfers from Work-in-Process to Finished Goods inventory. This is still an asset. The overhead is now baked into the value of completed products waiting in the warehouse, and it stays there whether those products sit for a day or six months.
Expense recognition happens only when a customer buys the product. At the point of sale, the full product cost, including its share of overhead, moves out of the Finished Goods asset account and into Cost of Goods Sold on the income statement. That’s the moment overhead finally becomes an expense, matched against the revenue from the same transaction.
When Overhead Gets Expensed Right Away
There’s an important exception. When your factory is sitting partially idle or running at abnormally low production levels, the overhead costs associated with that unused capacity are not capitalized. They go straight to expense in the current period.
The reasoning holds up once you work through it. If your plant normally produces 10,000 units per month but a supply chain disruption drops you to 3,000 units, loading all the fixed overhead onto those 3,000 units would inflate their reported cost well beyond what it normally takes to make them. Your inventory valuation would be distorted. Instead, you allocate fixed overhead based on normal capacity. The overhead attributable to the 7,000 units you didn’t produce is unallocated overhead and hits the income statement immediately as a period expense.1IFRS. IAS 2 Inventories
The same principle applies under U.S. GAAP. Abnormal amounts of wasted materials, freight, or handling costs also get expensed rather than capitalized. The test is whether the cost reflects normal production operations. If a pipe bursts and shuts down a production line for two weeks, the overhead you burned during that downtime doesn’t belong in inventory.
Non-Manufacturing Overhead Is Always an Expense
Overhead generated outside the factory never touches inventory. Selling, general, and administrative costs are period costs, recognized on the income statement the moment they’re incurred. It doesn’t matter whether you sold every unit you produced that month or nothing at all.
Selling expenses include sales team commissions, trade show costs, and advertising. General and administrative expenses cover executive compensation, corporate office rent, legal fees, and back-office operations like HR and finance. These functions keep the business running, but they don’t convert raw materials into a product, so they never get capitalized.
Where companies trip up is with costs that look like they could go either way. A quality control inspector on the factory floor is manufacturing overhead. A customer service representative handling post-sale complaints is SG&A. A warehouse storing raw materials for production might be manufacturing overhead; the same warehouse storing finished goods awaiting shipment might be a selling expense. The dividing line is always function and location relative to the production process. When in doubt, trace the cost back to whether it’s helping create the product or helping sell and administer the business.
A Different Answer for Taxes
Financial reporting isn’t the only place where overhead capitalization matters. The IRS has its own rules, and they’re often stricter than GAAP. Section 263A of the Internal Revenue Code, commonly called the Uniform Capitalization rules or UNICAP, requires manufacturers to capitalize both direct costs and a proper share of indirect costs into inventory for tax purposes.2Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses
UNICAP often catches costs that GAAP might let you expense. The IRS requires capitalization of indirect labor, officers’ compensation allocable to production, employee benefits, purchasing and handling costs, production-related insurance, and even portions of mixed service department costs like human resources or accounting staff who support manufacturing operations.
Smaller manufacturers can be exempt. Businesses that meet the gross receipts test under Section 448(c) don’t have to apply UNICAP. For tax years beginning in 2025, the inflation-adjusted threshold is $31 million in average annual gross receipts over the prior three tax years.3Internal Revenue Service. Revenue Procedure 2024-40 If your three-year average falls below the applicable limit, Section 263A does not apply.2Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses Small businesses that qualify also get a simplified inventory accounting option under Section 471(c): eligible taxpayers can either treat inventory as non-incidental materials and supplies or follow whatever method they use on their financial statements.4Office of the Law Revision Counsel. 26 USC 471 – General Rule for Inventories