Basic Overhead Allocation

1. Overview of Costs

In the previous analysis of fixed and variable costs, the structure of costs within organizations was examined.
Costs can either:
- Vary with the level of business activity (sales and/or production volume).
- Remain fixed regardless of activity level.
Understanding how costs behave is essential for managers to predict cost changes based on organizational actions.
This note focuses on the information provided by an organization’s cost accounting system for managerial decision-making.
Objective: To explain how and why companies account for overhead costs differently in their financial reports.
Cost accounting systems mainly aim to trace costs for financial reporting rather than for fixed/variable distinction.
Key areas of focus:
- Inventory categories for production costs (raw materials, work-in-process, finished goods).
- Methods of collecting and assigning costs (material, labor, overhead) to production units.

2. The Flow of Costs Through Inventories

Manufacturing expenditures are recorded as assets until goods are sold.
Three Basic Inventory Classes:
1. Raw Materials Inventory:
- Holds assets that are inputs to the production process; includes purchased materials.
- Example: hard disk drives for computer assembly are considered raw even if they are completed products.
1. Work-in-Process Inventory (WIP):
- Holds goods currently undergoing manufacturing; accumulates costs assigned to goods in production.
- Essential for cost accounting, referred to as “WIP”.
1. Finished Goods Inventory:
- Holds completed products ready for sale.
- Cost assessment ceases once goods are categorized here, despite post-production costs continuing to accrue (e.g., storage, insurance).
Internal reports that summarize costs flowing through these inventories into the cost of goods sold include a Cost of Goods Manufactured and Sold Statement.
Example from Framingham Framis, Inc.:
- Month end statement: March 31, 1997
- Materials:
  - Raw materials inventory, Mar 1: $30,000
  - Purchases: $210,000
  - Cost of materials issued: $207,500
- WIP:
  - Direct labor cost for March: $100,000
  - Overhead applied: $174,000
  - Total cost in production: $631,500
  - Cost of goods finished: $401,500
- Finished Goods:
  - Finished goods inventory, Mar 1: $68,000
  - Cost of goods available for sale: $469,500
  - Cost of goods sold: $413,000
Each section of the statement tracks the cost flow into and out of related inventory accounts.

3. Collecting and Assigning Costs

Cost accounting systems operate in real-time, capturing material, labor, and overhead costs as production proceeds.
Costs must be recorded chronologically as they accumulate throughout the production process.
Primary Criteria for Allocation Methods:
1. Assign total factory costs in a given period to the products manufactured in that period.
2. Ensure that resulting assignments do not distort inventory balances or cost of goods sold.
Overhead Cost Association:
- Determining appropriate manufacturing overhead costs for inclusion in product costs is more challenging than with direct costs (materials and labor).
- Generally Accepted Accounting Principles (GAAP) provide limited guidance regarding overhead association with production.
- Key guiding criterion: each unit produced should account for its "fair share" of costs.
- Differences in overhead costing methodologies are common across organizations.

4. Overhead Cost Allocation

Overhead costs can be directly associated with specific products, which is rare. In most cases, overhead is associated indirectly through allocation bases.
Overhead Allocation Basis: Quantifiable features used for overhead cost allocation.
- Example: direct labor hours as a basis for allocating factory overhead.
Traditional overhead allocation involves two main steps:
1. Determine total "shared" overhead.
2. Divide total by the total allocation basis measurement to find the average overhead cost per basis unit (overhead allocation rate).
A single plant-wide overhead rate may be set, or departmental rates for specific areas may be computed based on perceived unique overhead costs.
Overhead allocation reasoning:
- First reasoning: costs should be associated with actual services rendered.
- Second reasoning: based on an equitable share of facilities provided (e.g., depreciation shared by departments based on utilization).

5. Understanding Overhead Costs

By definition, overhead includes all factory costs beyond direct materials and direct labor, often shared among multiple cost objects.
Overhead costs can be categorized into two types based on variance:
1. Fixed Costs: Costs remain constant regardless of production volume (e.g., building depreciation).
2. Variable Costs: Change in proportion to production levels (e.g., maintenance that increases with production).
GAAP requires that all factory overhead costs are included in inventory calculations for cost of goods sold.

6. Types of Overhead Expenditures

Three Broad Categories:
1. Indirect Materials: Materials not traced to individual products (ex. cleaning materials).
2. Indirect Labor: Labor supporting manufacturing (ex. supervisors, maintenance).
3. General Factory Overhead: All factory costs outside direct materials, direct labor, indirect materials, and indirect labor (e.g., rent, utilities, factory salaries).

7. Overhead Rate Methods

Single Plant-wide Overhead Rate: Used when products consume resources similarly.
Multiple Department Overhead Rates: Used when different products demand varying levels of overhead support.
Each subgroup of overhead is called an overhead pool,
- Associated with a common allocation base.
- Procedure includes distributing total factory costs to production departments and calculating application rates.
Caution: Allocating costs with the wrong bases can lead to misleading data (GIGO - garbage in, garbage out).

8. Actual vs. Normal Overhead Cost

Actual Cost: Overhead recorded based on actual incurred costs post-factum.
Normal Cost: Estimates used to forecast overhead related to production; computed using a predetermined overhead rate (PDOR).
- Calculation: $PDOR = rac{ ext{Total estimated annual OH}}{ ext{Total estimated annual basis}}$
After production, apply the predetermined rate to calculated activity level to find applied overhead.
- Difference between applied and actual overhead leads to either overapplied or underapplied overhead.

9. Activity-Based Costing (ABC)

ABC aims to connect overhead costs to jobs/processes more accurately through identifying cost drivers.
Cost Drivers: Elements that fundamentally impact the rise or fall of costs; treat all costs as variable in the long run.
ABC differs from traditional models in terms of:
1. Defining Cost Pools: Groups costs based on specific drivers rather than collection points.
2. Identifying Cost Objects: Tailors cost objects to respective drivers, enabling clearer insights into overhead causes.
Cost misrepresentation signals that ABC may enhance cost information reliability.
Examples of symptoms indicating a need for ABC include:
- Unpredicted customer reactions to price changes.
- Competitive focus differing from a company’s perceived gross margins.
- Unexpected budget variances despite expected shifts in product mix.

10. Summary

Cost accounting systems gather costs related to productive activities and distribute their total among units.
Unit Product Cost: After calculating total costs, dividing by common work measures yields per-unit costs.
Normal Costing: Overhead applied based on estimated overhead for the year; leads to year-end adjustments addressing over/underapplied overhead, impacting management rather than just financial reporting.
Diverse firms explore Activity-Based Cost Management (ABM) to utilize improved cost insights for effective management planning.