Job Order Costing & Manufacturing

Cost Accounting Methodologies Overview

• Costing Spectrum:

  • Job Order Costing: Applied when products or batches are unique, distinct, or custom-ordered.

  • Process Costing: Applied in continuous, mass-production environments with homogeneous output.

  • Activity-Based Costing (ABC): Uses multi-activity drivers to refine overhead allocation.

• Cost Classifications:

  • Direct Costs: Easily traced directly to a job, comprising Direct Materials (DMDM) and Direct Labor (DLDL).

  • Indirect Costs / Manufacturing Overhead (MOH): All factory-level costs that cannot be easily traced to a specific unit (e.g., rent, utilities, supervision).

• Inventory Matching Principle: Product costs remain capitalized in inventory assets on the balance sheet until sold, at which point they are expensed as Cost of Goods Sold (COGSCOGS).

Job Order Costing Documentation & Flow

• Primary Documentation:

  • Production Order: Authorizes job production and permission to requisition materials and labor.

  • Job Cost Sheet: The main ledger tracking DMDM, DLDL, and Applied MOHMOH assigned to a specific job.

  • Bill of Materials (BOM): Standard specification of raw materials required per unit.

  • Materials Requisition Form: Formal request document to withdraw raw materials from storage.

  • Employee Time Ticket: Record tracking direct labor time spent on specific jobs.

• Inventory Account Flow:

  • Raw Materials Inventory →→ Work in Process (WIPWIP) Inventory →→ Finished Goods Inventory →→ Cost of Goods Sold (COGSCOGS).

• Uniform Capitalization (UniCap / GAAP): Mandates full absorption costing, requiring all manufacturing overhead to be capitalized into product inventory assets.

Manufacturing Overhead Application & POHR

• Predetermined Overhead Rate (POHR): Calculated prior to the fiscal period using estimated values to smooth seasonal variations:   Total Estimated MOH=Estimated Fixed MOH+(Variable MOH Rate×Estimated Allocation Base)Total Estimated MOH=Estimated Fixed MOH+(Variable MOH Rate×Estimated Allocation Base)POHR=Total Estimated MOH CostTotal Estimated Allocation Base VolumePOHR=Total Estimated Allocation Base VolumeTotal Estimated MOH Cost​

• Allocation Bases: Common drivers include Units Produced, Machine Hours, Direct Labor Hours (DLHDLH), or Direct Labor Cost (expressed as a percentage).

• Normal Costing Application:   Applied MOH=POHR×Actual Allocation Base ConsumedApplied MOH=POHR×Actual Allocation Base ConsumedTotal Job Cost=Actual DM+Actual DL+Applied MOHTotal Job Cost=Actual DM+Actual DL+Applied MOHUnit Product Cost=Total Job CostTotal Units ProducedUnit Product Cost=Total Units ProducedTotal Job Cost​

Cost-Plus Pricing & Overhead Structures

• Cost-Plus Pricing: Price is determined by adding a percentage markup to total job cost:   Selling Price=Total Job Cost+(Total Job Cost×Markup Percentage)Selling Price=Total Job Cost+(Total Job Cost×Markup Percentage)

• Plantwide vs. Departmental Rates:

  • Plantwide Rate: A single facility-wide POHRPOHR (simple, but may cause cost distortions).

  • Departmental Rates: Distinct POHRPOHR values per department based on specific activity drivers (e.g., Machine Hours in automated departments, Direct Labor Hours in manual departments).

Period-End Financial Reporting & Overhead Adjustments

• Overapplied vs. Underapplied MOH:

  • Underapplied MOH: Actual MOH>MOH> Applied MOHMOH (overhead was understated).

  • Overapplied MOH: Applied MOH>MOH> Actual MOHMOH (overhead was overstated).

• Write-Off Method: The net difference between actual and applied overhead is closed directly to COGSCOGS at period-end (debit COGSCOGS for underapplied, credit COGSCOGS for overapplied).

• Key Operational Rule: Actual MOHMOH is ignored during daily job cost tracking; it is only evaluated at period-end to calculate over/underapplication.