What is overhead?
Overhead is the total of all indirect business costs — expenses that keep the business running but cannot be traced directly to one specific product, customer, or service delivery. Rent, utilities, insurance, administrative salaries, and software subscriptions are the most common examples.
The key distinction that separates overhead from other costs:
- Direct costs (not overhead) — raw materials, direct labor on a specific job, packaging for a specific product. You can trace these to one unit or one customer.
- Overhead (indirect costs) — office rent, the HR manager's salary, general utility bills. These support the whole operation and can't be assigned to a single unit without using an allocation method.
Overhead matters for pricing because if you only price based on direct costs, you may generate sales volume but never cover the cost of running the business. Many small businesses fail not because of low revenue but because overhead is invisible until it isn't.
Overhead formula
In practice, you list every expense that supports the business but is not directly traceable to one product or customer, then add them up. Here is a typical monthly overhead cost stack for a service business:
Once you have total overhead, you can also express it as a rate by dividing by an allocation base — covered in the rate methods section below.
Fixed, variable, and semi-variable overhead
Splitting overhead by behaviour — how it responds to changes in activity — is essential for budgeting and forecasting. A cost that stays flat when volume doubles is very different from one that moves with production.
Knowing which category each overhead cost falls into lets you predict how total overhead changes as the business grows or contracts. Fixed costs per unit fall as volume rises — a key driver of operating leverage.
Four overhead rate methods — which allocation base to use
The overhead rate converts a lump-sum overhead total into a per-unit or per-activity figure that can be applied to individual jobs, products, or periods. The formula is the same each time — only the denominator (allocation base) changes:
Use the method that best reflects how overhead is actually consumed in your business. Inconsistent allocation bases distort job costing and lead to systematic under- or over-pricing of certain work types.
Overhead as a percentage of revenue — what's healthy?
Expressing overhead as a percentage of revenue helps benchmark cost structure across periods and against industry norms. Here is a simplified view of how a $45,000/month revenue business might look with different overhead structures:
Overhead as a percentage of revenue varies widely by industry — typically 10–25% for lean product businesses, 20–40% for service businesses, and higher for businesses with significant fixed infrastructure. What matters most is tracking it consistently over time: overhead creeping from 20% to 30% of revenue while margins stay flat is a leading indicator of a profitability problem.
Step-by-step calculation method
Worked examples
Monthly overhead total
Rent $1,800 · Utilities $250 · Insurance $150 · Software $100
✅ Total overhead = $2,300/month
Overhead rate as % revenue
Total overhead: $9,000 · Monthly sales: $45,000
🟡 20% overhead rate — include in pricing
Factory overhead total
Rent $6K · Supervision $4.5K · Utilities $1.2K · Depreciation $1.8K
✅ Manufacturing overhead = $13,500
Overhead rate per labor hour
Total overhead: $7,200 · Direct labor hours: 360
🔵 $20/hr rate — apply to each job
Common mistakes to avoid
- Mixing direct costs into overhead. Raw materials and direct labor attached to a specific job are direct costs — not overhead. Including them in overhead double-counts their impact and inflates the overhead total.
- Using inconsistent time periods. Monthly rent compared against weekly labor hours produces a meaningless overhead rate. Convert all inputs to the same period before dividing.
- Forgetting indirect cost categories. Software subscriptions, professional service retainers, owner draws classified as salary, and depreciation on shared assets are frequently missed. Run through every bank line item.
- Using a mismatched allocation base. A machine-intensive factory using direct labor hours as the allocation base will over-allocate overhead to labor-heavy jobs and under-allocate to automated ones. Match the base to how overhead is actually consumed.
- Treating overhead as unimportant because it is indirect. Indirect costs are still real costs. Overhead that creeps upward while revenue stays flat will compress margin even when direct costs are well controlled.
Frequently asked questions
What is the formula for overhead?
Total overhead = sum of all indirect business costs for the period. Overhead rate = total overhead ÷ allocation base (e.g. labor hours, units, or sales). The right allocation base depends on how overhead is consumed in your business.
What is the difference between overhead and operating expenses?
Operating expenses include all costs of running the business — both direct and indirect. Overhead specifically refers to the indirect portion: costs that cannot be traced to a single product, job, or customer. All overhead is an operating expense, but not all operating expenses are overhead.
Is direct labor an overhead cost?
Direct labor assigned to a specific job, product, or customer is a direct cost — not overhead. However, indirect labor (such as a supervisor or admin who supports the whole operation rather than one specific job) is considered overhead.
Why does overhead matter for pricing?
If you price based only on direct costs, you may generate revenue but never recover the cost of keeping the business open. Overhead must be included in pricing calculations — either as a per-unit rate or as a percentage mark-up — to ensure each sale contributes to covering total operating costs.
What is a typical overhead percentage?
It varies significantly by industry and business model. Product businesses and manufacturers typically run overhead at 10–25% of revenue. Service businesses often run 20–40% due to higher administrative and facilities costs relative to revenue. The most important benchmark is your own trend over time.