Manufacturing Overhead

Manufacturing overhead, also called factory overhead, is the pool of indirect production costs a plant incurs that cannot be economically traced to a specific unit, job, or work order. It sits alongside the two direct costs of production, direct materials and direct labor, and together those three buckets make up total manufacturing cost. Typical overhead line items include factory rent and property taxes, depreciation on machines and tooling, electricity and other utilities consumed on the floor, indirect labor such as supervisors, material handlers, and quality inspectors, maintenance and repair, factory supplies, and machine consumables. Manufacturing overhead and factory overhead are fully interchangeable terms; some shops also call it burden or shop burden.

Because overhead cannot be matched to a part the way a steel blank or an hour of CNC time can, it has to be allocated. Cost accountants pool the estimated overhead for a period and spread it across production using an allocation base that correlates with how the cost is consumed, most commonly machine hours, direct labor hours, or direct labor dollars. A predetermined overhead rate is computed at the start of the period by dividing estimated total overhead by the estimated total base, for example 12 dollars of overhead per machine hour. As jobs run, that rate is applied to each job's actual hours so every part absorbs a fair share of plant cost. At period end, applied overhead is compared to actual overhead; the difference is the over- or under-applied variance, which gets analyzed and reconciled into cost of goods sold.

On the shop floor, overhead is where standard costs quietly succeed or fail. Cost engineers set work-center rates that bundle machine depreciation, floor space, and supervision into an hourly burden, and those rates flow into every quote and every job-cost roll-up. A WorkCell deployment captures the raw drivers automatically: the MES and shop-floor terminals log machine hours and labor clock-ins, the scheduling engine tracks capacity utilization and run time, and the accounting module holds the overhead GL pools. Multiplying logged hours by the burden rate applies overhead to each work order in real time rather than waiting for a month-end spreadsheet.

Manufacturing overhead matters because it is usually the least visible and most distorting chunk of product cost. Misallocated burden makes high-volume parts look artificially expensive and low-volume specials look cheap, which corrupts pricing, margin analysis, and the make-versus-buy decision. Accurate overhead absorption underpins inventory valuation on the balance sheet, gross-margin reporting, and quoting discipline. It ties directly into job costing, total manufacturing cost, and cost of goods sold, and the cleaner the shop-floor data feeding it, the more trustworthy every downstream financial number becomes.