Welcome to Overhead Cost Statements!
In your journey through BA2 – Fundamentals of Management Accounting, you’ve already learned that some costs are easy to track (like the wood in a table). But what about the factory rent? Or the electricity used to run the lights? These are Overheads.
In this chapter, we are going to learn the "art of sharing." Since we can’t easily pin these costs to a single product, we use a structured process called Allocation and Apportionment to make sure every department pays its fair share. Don’t worry if this seems a bit abstract at first; we’ll break it down step-by-step!
1. Understanding Cost Centers
Before we start moving money around, we need to know where it's going. In a factory, we usually have two types of "rooms" or Cost Centers:
1. Production Cost Centers: These are the departments where the products are actually made (e.g., the Assembly Room or the Machining Department).
2. Service Cost Centers: These departments don't make the product, but they help the factory run (e.g., the Maintenance Team, the Canteen, or the HR Department).
Goal: Eventually, all costs must end up in the Production Cost Centers because that’s where the products are. Products can’t "walk" into the Canteen, so we have to move the Canteen's costs to the Production rooms instead!
2. Allocation vs. Apportionment
These two words sound similar, but they mean different things in management accounting. Think of it like a pizza party:
Allocation (The "Direct Hit")
If you buy a gluten-free pizza specifically for one friend, you allocate the whole cost of that pizza to them.
In accounting, Allocation is when a cost can be clearly and 100% identified with a specific department.
Example: The salary of the manager who only works in the Assembly Department.
Apportionment (The "Fair Share")
If you buy a large pepperoni pizza for four people to share, you apportion the cost among them.
In accounting, Apportionment happens when a cost is shared by multiple departments. We have to split it using a "fair" method.
Example: Factory rent. All departments use the building, so they all share the rent cost.
Quick Review:
- Allocation: The cost belongs to one department.
- Apportionment: The cost is shared by many departments.
3. Choosing a Basis for Apportionment
How do we decide what is "fair" when sharing a cost? We use a Basis of Apportionment. This should be the most logical "driver" of the cost.
Here are the common ones you need to know for your exam:
1. Rent and Rates: Usually shared based on Floor Area (square meters). The bigger the room, the more rent it pays.
2. Light and Heat: Also usually Floor Area or Volume of the room.
3. Power: Shared based on Kilowatt-hours (kWh) or the Horsepower of the machines in that room.
4. Depreciation/Insurance of Machinery: Based on the Value of the Machinery in each department.
5. Canteen or HR Costs: Based on the Number of Employees in each department.
Memory Trick: Ask yourself, "What makes this bill go up?" If adding more people makes the bill go up (like the Canteen), use "Number of Employees" as your basis!
4. The Calculation: How to Apportion Costs
When you need to calculate the share of a cost for a specific department, use this simple formula:
\( \text{Department's Share} = \frac{\text{Total Overhead Cost}}{\text{Total Value of Basis}} \times \text{Value of Basis in that Department} \)
Example:
Total Factory Rent is \$10,000.
\nTotal Floor Area is 2,000 sq meters.
\nThe Machining Department occupies 500 sq meters.
\n\( \text{Machining Share} = \frac{\$10,000}{2,000} \times 500 = \$2,500 \)
5. Re-apportionment of Service Centers
Remember how we said products don't visit the Canteen? This means we cannot leave costs sitting in a Service Cost Center. We must re-apportion them to the Production Cost Centers.
Step-by-Step Process:
1. Primary Apportionment: Share all factory overheads (like rent) among all departments (Production + Service).
2. Secondary Apportionment (Re-apportionment): Take the total costs now sitting in the Service departments and move them into the Production departments based on how much the Production departments use those services.
Analogy: Imagine a "Cleaning Department" cost. If the Assembly room uses 70% of the cleaning time and Finishing uses 30%, we move 70% of the Cleaning Department's total costs into Assembly and 30% into Finishing. Now the Cleaning Department has a balance of zero!
6. The Overhead Analysis Sheet (OAS)
In your exam, you might see a table called an Overhead Analysis Sheet. It’s just a organized way of doing everything we just talked about. It usually looks like this:
1. List the costs (Rent, Power, etc.).
2. State the basis (Floor area, Machine value).
3. Allocate/Apportion the costs across all columns (Production and Service centers).
4. Total the columns.
5. Re-apportion the Service centers to the Production centers.
6. Final Total: Service centers should now be zero, and all costs are in the Production centers.
Common Mistakes to Avoid
- Using the wrong basis: Don't apportion Rent based on the number of employees! Always look for floor area first.
- Forgetting to re-apportion: If a question asks for the "Total overheads for Production Dept A," make sure you have added its share of the Service department costs.
- Direct Costs: Remember that Direct Materials and Direct Labor are not usually included in an Overhead Analysis Sheet unless they belong to a Service Department (this is a tricky CIMA favorite!).
Key Takeaways
- Overheads are indirect costs that must be shared.
- Allocation is for costs that belong to one department only.
- Apportionment uses a logical basis (like floor area) to split shared costs.
- Re-apportionment moves costs from Service Departments (Canteen, Maintenance) to Production Departments (Assembly, Machining).
- The Final Goal: All overheads should end up in a Production Cost Center so they can eventually be attached to the products being made.
Keep practicing these calculations! Once you get the hang of the formula, filling out an Overhead Analysis Sheet becomes like solving a fun logic puzzle.