How to Calculate Indirect Cost in Accounting

Indirect costs are expenses that cannot be directly traced to a specific product, service, or cost object. Unlike direct costs, which are easily allocated to specific items, indirect costs require allocation methods to distribute their costs across multiple cost objects. This guide explains how to calculate indirect costs in accounting, including the formula, allocation methods, and practical examples.

What is Indirect Cost?

Indirect costs are expenses that support the operations of a business but cannot be directly assigned to a specific product, service, or cost object. These costs are often shared across multiple departments or products. Common examples of indirect costs include:

Rent and utilities
Salaries of administrative staff
Insurance
Depreciation of office equipment
Marketing and advertising expenses

Because indirect costs cannot be directly traced to a specific item, accountants use allocation methods to distribute these costs across multiple cost objects. This process helps businesses make informed decisions about pricing, budgeting, and cost control.

How to Calculate Indirect Cost

Calculating indirect costs involves two main steps: identifying the indirect costs and allocating them to the appropriate cost objects. The formula for calculating indirect cost allocation is:

Indirect Cost Allocation = (Total Indirect Cost ÷ Allocation Base) × Cost Object's Allocation Base Value

Where:

Total Indirect Cost - The total amount of the indirect expense
Allocation Base - The factor used to distribute the indirect cost (e.g., square footage, number of employees, machine hours)
Cost Object's Allocation Base Value - The specific value of the allocation base for the cost object

Steps to Calculate Indirect Cost

Identify all indirect costs for the period.
Determine the allocation base that best represents the use of the indirect cost.
Calculate the allocation rate by dividing the total indirect cost by the total allocation base.
Multiply the allocation rate by the cost object's allocation base value to determine the allocated indirect cost.

Common Allocation Methods

There are several methods for allocating indirect costs, including:

Direct Allocation - Allocating costs based on a direct relationship (e.g., square footage for rent).
Sales Allocation - Allocating costs based on sales revenue.
Activity-Based Costing (ABC) - Allocating costs based on the activities that consume resources.
Machine Hours - Allocating costs based on the number of machine hours used.

Example Calculation

Let's walk through an example to illustrate how to calculate indirect costs. Suppose a company has the following indirect costs and allocation base:

Indirect Cost	Total Cost
Rent	$12,000
Insurance	$3,000
Depreciation	$5,000
Total Indirect Cost	$20,000

The company uses square footage as the allocation base. The total square footage for the company is 10,000 sq ft. The company has two departments: Sales and Production, with the following square footage:

Department	Square Footage
Sales	3,000 sq ft
Production	7,000 sq ft

To calculate the allocated indirect cost for each department, follow these steps:

Calculate the allocation rate: $20,000 ÷ 10,000 sq ft = $2 per sq ft.
Allocate the cost to the Sales department: $2 × 3,000 sq ft = $6,000.
Allocate the cost to the Production department: $2 × 7,000 sq ft = $14,000.

The final allocation of indirect costs is as follows:

Department	Allocated Indirect Cost
Sales	$6,000
Production	$14,000

Common Mistakes to Avoid

When calculating indirect costs, it's easy to make mistakes that can affect financial reporting and decision-making. Here are some common pitfalls to avoid:

Incorrect Allocation Base - Using an allocation base that doesn't accurately reflect the use of the indirect cost can lead to incorrect allocations.
Overlooking Indirect Costs - Failing to include all relevant indirect costs can result in underallocated or overallocated costs.
Inconsistent Allocation Methods - Using different allocation methods for similar costs can make it difficult to compare costs across departments or products.
Ignoring Cost Object Changes - Not adjusting allocations when cost objects change (e.g., a department expands or contracts) can lead to inaccurate cost allocations.

To ensure accurate indirect cost calculations, regularly review and update your allocation methods, and consider using activity-based costing for more complex cost allocations.

FAQ

What is the difference between direct and indirect costs?

Direct costs are expenses that can be directly traced to a specific product, service, or cost object. Indirect costs, on the other hand, are expenses that support the operations of a business but cannot be directly assigned to a specific item. Direct costs are easier to allocate, while indirect costs require allocation methods to distribute their costs across multiple cost objects.

How do I choose the right allocation base for indirect costs?

The allocation base should be a factor that accurately reflects the use of the indirect cost. Common allocation bases include square footage, machine hours, number of employees, and sales revenue. Choose an allocation base that best represents how the indirect cost is consumed or utilized.

Can indirect costs be eliminated?

While it may not be possible to eliminate all indirect costs, businesses can often reduce them by renegotiating contracts, improving efficiency, or finding alternative cost-saving measures. Regularly reviewing indirect costs can help identify areas where expenses can be reduced or reallocated.

How often should indirect costs be recalculated?

Indirect costs should be recalculated whenever there are significant changes in the allocation base, cost objects, or indirect expenses. Regularly reviewing and updating indirect cost allocations ensures that costs are accurately reflected in financial reports and decision-making processes.