What Is Overhead Cost? Types, Calculation, and Allocation Explained

Overhead costs are the ongoing expenses required to run a business that are not directly tied to producing a specific product or delivering a specific service. Rent, utilities, insurance, and administrative salaries are all overhead — they keep the business operational but do not contribute directly to a single unit of output.

Understanding overhead is essential for pricing, profitability analysis, and budgeting. If you price your services based only on direct costs (materials and labor), you may be selling at a loss without realizing it. According to SCORE's small business research, underestimating overhead is one of the top financial mistakes that leads to small business failure.

What Counts as Overhead?

Overhead includes any expense that supports the business as a whole rather than a specific project or product. Common examples:

• Rent or mortgage on office, warehouse, or retail space
• Utilities — electricity, water, gas, internet, phone
• Insurance — general liability, property, professional liability
• Administrative salaries — office managers, HR staff, receptionists
• Accounting and legal fees — bookkeeping, tax preparation, legal counsel
• Office supplies — paper, ink, cleaning supplies
• Software subscriptions — email, project management, invoicing tools
• Depreciation — on equipment, vehicles, and furniture
• Property taxes
• Advertising and marketing — general brand marketing (not project-specific)
• Travel — general business travel (not tied to a specific client engagement)

Expenses that are directly attributable to a product or project — such as raw materials, subcontractor labor on a specific job, or shipping for a customer order — are direct costs, not overhead.

The Three Types of Overhead

Fixed Overhead

Costs that remain the same regardless of business volume. Your rent is the same whether you serve 10 clients or 100. Other examples: insurance premiums, salaried administrative staff, and annual software licenses.

Variable Overhead

Costs that increase or decrease with business activity. Shipping costs rise when you fulfill more orders. Utility bills may increase during peak production periods. Sales commissions fluctuate with revenue.

Semi-Variable (Mixed) Overhead

Costs with both a fixed base and a variable component. A phone plan might have a flat monthly fee plus per-minute charges for overages. Utility bills have a base charge plus usage-based rates.

Understanding which category each expense falls into helps with forecasting. Fixed overhead is predictable; variable overhead requires assumptions about volume; semi-variable overhead needs both.

How to Calculate Overhead Rate

The overhead rate tells you how much overhead you spend relative to your revenue or labor costs. It is essential for pricing — if your overhead rate is 35%, you need to factor that into every proposal and invoice.

Step 1: Total Your Overhead Costs

Add up all indirect costs for a given period (monthly or annually). For example:

Overhead Category	Monthly Cost
Rent	$2,500
Utilities	$400
Insurance	$350
Administrative salary	$3,800
Software subscriptions	$250
Office supplies	$150
Depreciation	$300
Total Overhead	$7,750

Step 2: Calculate the Overhead Rate

There are two common formulas, depending on what comparison is most useful:

Overhead rate as a percentage of revenue:

Overhead Rate = (Total Overhead / Total Revenue) x 100

If your monthly revenue is $25,000:

$7,750 / $25,000 x 100 = 31%

This means 31 cents of every dollar you earn goes to overhead.

Overhead rate per direct labor hour:

Overhead Rate = Total Overhead / Total Direct Labor Hours

If your team logs 500 direct labor hours per month:

$7,750 / 500 = $15.50 per labor hour

This is the amount of overhead generated by each hour of productive work. You need to account for this when setting hourly rates.

How to Allocate Overhead to Products or Projects

Knowing your total overhead is useful for big-picture analysis, but businesses that sell multiple products or services need to allocate overhead to each one to determine true profitability.

Step 1: Choose an Allocation Base

The allocation base is the activity measure you use to distribute overhead. Common bases include:

• Direct labor hours — best for service businesses and labor-intensive manufacturing
• Machine hours — best for capital-intensive manufacturing
• Direct material costs — best when material costs vary significantly between products
• Revenue — a simple approach when other bases are difficult to measure

Step 2: Calculate the Allocation Rate

Allocation Rate = Total Overhead / Total Allocation Base

For example, if total overhead is $7,750 and total direct labor hours are 500:

Allocation Rate = $7,750 / 500 = $15.50 per hour

Step 3: Apply to Each Product or Project

Multiply the allocation rate by the actual allocation base consumed by each product or project.

Example:

• Project A consumed 120 direct labor hours: 120 x $15.50 = $1,860 in allocated overhead
• Project B consumed 80 direct labor hours: 80 x $15.50 = $1,240 in allocated overhead

This reveals the true cost of each project, including its fair share of overhead — not just the direct costs.

Why Overhead Matters for Pricing

Many small businesses set prices based on direct costs plus a markup, ignoring overhead entirely. This is a common path to unprofitability.

Consider a freelance designer who charges $75 per hour. If their overhead rate is $15.50 per hour, their effective rate is really $59.50 per hour. To maintain the desired margin, they would need to either raise their hourly rate or reduce overhead.

Tracking overhead alongside direct costs in a tool like Agiled's expense management gives you the full picture of what each project actually costs, so you can price with confidence.

How to Reduce Overhead

Reducing overhead without sacrificing quality is one of the fastest ways to improve profitability:

• Negotiate leases — renegotiate rent at renewal or consider a smaller space if remote work reduces your need for office space.
• Audit subscriptions — cancel software and services you no longer use. According to Gartner research, the average business wastes 25-30% of its software spend on unused or underutilized licenses.
• Consolidate tools — instead of paying for separate invoicing, project management, CRM, and time tracking subscriptions, use an integrated platform that covers multiple functions.
• Review insurance — shop your insurance annually to ensure competitive rates.
• Automate administrative tasks — reduce the hours spent on manual bookkeeping, data entry, and scheduling.

Tracking Overhead Over Time

Overhead is not a one-time calculation. Review it monthly or quarterly to catch cost creep early. Tracking your overhead rate over time shows whether your business is becoming more or less efficient as it grows.

A rising overhead rate relative to revenue is a warning sign. A declining rate means you are scaling efficiently — generating more revenue without proportionally increasing your indirect costs.

Related Articles:

• How to Calculate Manufacturing Overhead Costs
• How to Calculate Assets
• How to Track Your Small Business Expenses
• Fixed Cost and Variable Cost