Overhead costs are ongoing, indirect operational expenses required to maintain business operations that cannot be directly attributed to a specific product, service, or cost unit. Unlike direct project or production spending, overhead costs support commercial activity across an organisation as a whole.
In financial management, tracking overhead expenses helps finance teams price contracts accurately and safeguard sustainable operational margins.
What are overhead costs?
In managerial and financial accounting, overhead costs encompass every indirect expense required to keep an organisation functioning. If you run an accountancy practice, manufacturing plant, or distribution firm, your rent, administrative payroll, commercial insurance, and software licences are all overheads. They do not increase or decrease on a single customer invoice, yet the organisation cannot operate without them.
For UK businesses, overheads are recorded through the general ledger and assigned to specific departments using a cost centre structure. From a statutory perspective, HM Revenue and Customs (HMRC) evaluates these expenses under Section 54 of the Corporation Tax Act 2009. To qualify as an allowable deduction against taxable trading profits, revenue overheads must be incurred wholly and exclusively for the purposes of the trade. If an expense serves a dual personal and commercial purpose, it is disallowed unless an identifiable business proportion can be quantified.
Types of overhead costs
Businesses frequently categorise overheads into three main groups based on how spending behaves as operational activity changes:
Fixed overhead costs
Common operating expenses include commercial property rent, local council business rates, annual insurance premiums, audit fees, and core administrative salaries. Because fixed overheads do not adjust automatically during trading downturns, monitoring them relative to revenue is vital for working capital stability.
Variable overhead costs
Variable overhead costs are indirect expenses that increase or decrease in aggregate with the volume of output or operational activity. Examples of variable overhead costs include electricity consumed by factory machinery and consumable factory supplies that fluctuate with production activity. When operational activity increases, aggregate variable overhead spending rises, and when activity slows, it declines.
Semi-variable overhead costs
Semi-variable overhead costs, often called mixed costs, combine a baseline standing charge with a variable usage component. Examples of semi-variable overhead costs include commercial utilities (such as electricity and gas) and telephone services. In these contracts, an organisation pays a fixed fee to maintain the service connection alongside additional charges based on actual consumption.
Common examples of overhead costs
Every business incurs indirect expenses to maintain its day-to-day operations. Depending on the company's operating model, common examples include:
- Commercial premises rent, local business rates, and building insurance
- Office power, heating, and central telecommunications
- Essential software licences, accounting systems, and IT support
- General administrative payroll, legal retainers, and audit fees
- Plant maintenance and factory equipment depreciation
Managing overheads remains a consistent priority for finance leaders facing shifting economic conditions. According to the British Chambers of Commerce Cost Stack Calculator, domestic policy-driven costs for an illustrative UK mid-sized SME increased by more than 70% since 2016 (British Chambers of Commerce). When cumulative overhead pressures rise, finance teams must carefully balance cost discipline against the operational investments needed to support trading.
Overhead costs vs direct costs
Understanding how indirect overheads differ from direct costs is vital for accurate financial management. Direct costs relate directly to producing specific goods or delivering specific client projects, such as raw materials and dedicated subcontractor fees. These expenditures typically form part of cost of goods sold (COGS) on your profit and loss statement.
Overhead costs, by contrast, support commercial operations as an overarching whole. Rather than attaching to an individual job or product, they represent the ongoing expenses required to maintain business infrastructure.
Attribute | Direct costs | Overhead costs |
|---|---|---|
Operational focus | Specific deliverables or production units | Shared across ongoing commercial operations |
P&L classification | Incurred within cost of goods sold | Incurred within operating expenses |
Examples | Raw materials, project subcontractors | Office rent, business rates, central IT |
For statutory financial reporting under UK GAAP (FRS 102), specific rules govern whether manufacturing overheads may be absorbed into inventory valuations. Entities should consult published accounting standards or their statutory auditor for detailed accounting treatment.
How to calculate overhead costs
Finance teams evaluate indirect overheads through several practical methods to monitor operational efficiency and price commercial work accurately.
1. Overhead rate relative to turnover
A widely used benchmark compares total indirect operating costs against total sales revenue over a trading period. Tracking this proportion helps leadership understand how much revenue is absorbed by commercial infrastructure before covering direct costs or yielding an operating profit.
2. Direct-cost overhead rate for project bidding
Contractors and service businesses often assess indirect overheads relative to direct project costs to ensure shared expenses are recovered across billable work. Under this approach, a business calculates an indirect cost percentage across its historic or budgeted cost base and applies that markup to project estimates, ensuring individual contracts contribute toward general business overheads before profit is added.
3. Overhead absorption rate (OAR) for manufacturing
In manufacturing cost accounting, entities calculate a predetermined absorption rate to allocate indirect factory expenses across production lines using an operational activity driver:
Overhead Absorption Rate = Budgeted production overheads / Budgeted activity level (e.g. machine hours)
For example, if a manufacturing business budgets £200,000 in factory production overheads and plans for 50,000 machine hours, the OAR is £4.00 per machine hour. If an operational run utilises 48,000 actual machine hours, £192,000 of overhead is absorbed into production inventory.