Overhead costs are the indirect expenses that keep a business running regardless of how much it sells: rent, utilities, insurance, office salaries, software subscriptions, and similar costs that support operations without attaching to any single product or service. Calculating them accurately lets you price work to cover what it actually takes to operate, and deducting them correctly under Section 162 of the Internal Revenue Code reduces your taxable income. Getting either step wrong produces mispriced products, distorted profit numbers, or an IRS notice.
What Counts as Overhead
The line between overhead and direct costs comes down to traceability. If you can point at a finished product or a client project and say “that expense went into this one,” you have a direct cost. Raw steel in a manufactured part, lumber in a custom cabinet, or labor hours billed to a specific engagement all qualify.
Overhead supports the environment where the work happens without belonging to any one finished item. The electricity powering your facility benefits everything produced there, but you can’t assign a meaningful slice of the bill to one unit. The same goes for the bookkeeper’s salary, the liability insurance policy, and the cleaning service. Because these costs can’t be tied to specific output, businesses spread them across production using an allocation method.
Fixed, Variable, and Semi-Variable Overhead
Overhead behaves differently as sales volume changes, and sorting your costs by that behavior makes cash flow forecasting far more reliable.
Fixed overhead stays constant regardless of activity. A commercial lease payment is the same whether you serve ten customers or a thousand in a month. Property insurance and annual software licenses work the same way.
Variable overhead rises and falls with production while remaining indirect. Shipping supplies, packaging, and the portion of the electric bill tied to running production equipment all move with output.
Semi-variable costs combine a flat base with a usage component. A business phone plan with a fixed monthly rate plus per-minute overage charges is the standard example.
Common Categories of Overhead
Most businesses group overhead into four buckets. The categories aren’t legally mandated, but they make financial statements easier to read and cost problems easier to catch.
- Administrative overhead covers legal fees, accounting services, office salaries for staff who don’t produce goods or bill clients, office supplies, and general insurance.
- Selling overhead includes advertising, marketing, sales commissions, trade show expenses, and CRM subscriptions.
- Manufacturing overhead captures depreciation on production equipment, factory rent, janitorial services for the plant floor, quality control labor, and indirect materials like lubricants or cleaning solvents.
- Technology overhead includes cloud software subscriptions, IT support, cybersecurity services, and communication platforms. Monthly subscription fees for software you access but don’t own are generally deductible as ordinary business expenses in the year you pay them, while software you purchase outright may need to be capitalized and depreciated depending on cost and useful life.
Every indirect dollar should land in one of these groups. Missing minor categories like bank service charges or small recurring subscriptions understates operating costs and inflates the profit margins you see on paper.
How to Calculate an Overhead Rate
The overhead rate converts total indirect costs into a per-unit or per-hour figure you can build into pricing. Divide total overhead by your chosen allocation base. The base is usually direct labor hours, machine hours, or direct labor dollars, whichever best reflects how the business consumes resources.
If monthly overhead totals $50,000 and your team logs 25,000 direct labor hours, the overhead rate is $2.00 per labor hour. A project requiring 500 labor hours absorbs $1,000 in allocated overhead on top of its direct material and labor costs.
This single-rate approach works for businesses with relatively uniform production. If your operation runs both labor-intensive and machine-intensive product lines, a single rate based on labor hours over-allocates overhead to labor-heavy products and under-allocates to machine-heavy ones. Prices set from those distorted numbers will be wrong in both directions.
Activity-based costing addresses this by breaking overhead into multiple cost pools, each tied to a specific activity like machine setups, purchase orders, or quality inspections. Each pool has its own rate driven by the activity that actually causes the cost. The tradeoff is complexity: identifying activities, tracking drivers, and maintaining the system takes real accounting effort, and for a business with one or two product lines running through a similar process, the added precision rarely justifies the cost.
Deducting Overhead Under Section 162
Most overhead is fully deductible in the year you pay it. Section 162 of the Internal Revenue Code allows a deduction for all ordinary and necessary expenses incurred while carrying on a trade or business, including reasonable salaries, travel expenses, and rent for property you use but don’t own.1Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses “Ordinary” means common and accepted in your industry; “necessary” means helpful and appropriate. The expense doesn’t have to be indispensable.
Rent, utilities, insurance premiums, office supplies, professional fees, and wages for non-production staff all sit squarely within this deduction. You subtract them from gross income on your business tax return, reducing income subject to tax. Sole proprietors report these on Schedule C; corporations claim them on the corporate return.
One timing rule catches people out. If you prepay an expense that covers a future period, you generally can’t deduct the full amount in the year you write the check. The IRS requires you to spread the deduction across the periods the payment actually covers.2Internal Revenue Service. Publication 538 – Accounting Periods and Methods Pay $3,000 in December for a three-year insurance policy starting July 1, and you deduct only the portion attributable to the current tax year. An exception applies to prepayments covering 12 months or less that don’t extend beyond the end of the following tax year; those can be deducted in full when paid.
When Overhead Has to Be Capitalized
Not every overhead expense is deductible immediately. When you buy equipment, furniture, or other property that will serve the business for more than a year, the IRS treats the purchase as a capital expenditure. You recover the cost through annual depreciation over the asset’s useful life rather than writing off the full amount up front.3Internal Revenue Service. Topic No. 704, Depreciation
Several rules let you accelerate or skip that spread-out treatment.
Bonus Depreciation
Federal law currently allows 100 percent bonus depreciation for qualified property acquired after January 19, 2025, meaning you can deduct the entire cost of eligible equipment and machinery in the year you place it in service.4Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System Full expensing was restored by the One, Big, Beautiful Bill Act after a phasedown that had reduced the rate to 40 percent for property placed in service during 2025. The property must be new or, in many cases, used property that is new to you, with a recovery period of 20 years or less. If you’d rather spread the deduction out, you can elect a reduced 40 percent rate for the first tax year ending after January 19, 2025.5Internal Revenue Service. Notice 2026-11 – Interim Guidance on Additional First Year Depreciation Deduction Under Section 168(k)
Section 179 Expensing
Section 179 offers another route, with dollar limits. For tax years beginning in 2026, you can expense up to $2,560,000 of qualifying purchases. The deduction phases out dollar-for-dollar once total qualifying property placed in service during the year exceeds $4,090,000.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Unlike bonus depreciation, Section 179 can also apply to certain improvements to nonresidential real property like roofs, HVAC systems, and security systems. The deduction for any sport utility vehicle is capped at $32,000.
De Minimis Safe Harbor
For smaller purchases, the de minimis safe harbor lets you expense tangible property below a set threshold without capitalizing at all. Businesses with audited financial statements can expense items costing up to $5,000 per invoice. Without audited financials, the ceiling drops to $2,500 per invoice.7Internal Revenue Service. Tangible Property Final Regulations You make the election annually on your return. It’s useful for laptops, office furniture, and small tools that clearly benefit the business for more than a year but aren’t worth putting on a depreciation schedule.
Meals, Entertainment, and Other Partial Deductions
Some overhead categories come with built-in limits that trip up owners who assume full deductibility.
Business meals are deductible at 50 percent of cost, provided you or an employee is present and the food isn’t extravagant.8Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses The meal can be with a client, potential customer, consultant, or similar business contact. Keep the receipt and note who attended and the business purpose.
Entertainment expenses are completely nondeductible. Tickets to sporting events, concerts, and golf outings can’t be written off at all, even if you discuss business during the event.9Internal Revenue Service. Tax Cuts and Jobs Act – Businesses Dues to social, athletic, or sporting clubs fall into the same nondeductible bucket. This is one of the most common areas of over-deduction, and an easy target for IRS auditors.
Home Office Overhead
If you use part of your home exclusively and regularly for business, you can deduct a portion of household overhead. The space has to be your principal place of business, a place where you regularly meet clients, or a separate structure used for business. The key word is “exclusively.” A spare bedroom that doubles as a guest room doesn’t qualify.10Internal Revenue Service. How Small Business Owners Can Deduct Their Home Office From Their Taxes
You have two calculation methods. The actual expense method requires figuring what percentage of your home’s total square footage is devoted to business, then applying that percentage to indirect household expenses like mortgage interest, insurance, utilities, repairs, and depreciation. Expenses that relate only to the business space, like painting the office, are deductible in full.
The simplified method skips the allocation math. You deduct $5 per square foot of business space, up to 300 square feet, for a maximum annual deduction of $1,500.11Internal Revenue Service. Simplified Option for Home Office Deduction The simplified method saves time but often produces a smaller deduction than the actual expense method in areas with high housing costs. Run both before choosing.
UNICAP Rules for Producers and Resellers
If your business manufactures goods or buys inventory for resale, a separate rule may block you from deducting certain overhead immediately. The uniform capitalization rules under Section 263A require you to add a portion of indirect overhead to the cost of inventory rather than expensing it currently.12Office of the Law Revision Counsel. 26 US Code 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses Costs like warehouse rent, administrative salaries tied to production, and IT support get partially re-allocated to inventory for tax purposes. You don’t lose the deduction; it shifts to the year you actually sell that inventory.
Overhead categories subject to capitalization include storage and handling, officer compensation tied to production activities, and a share of service department costs like accounting and human resources.13Internal Revenue Service. Producer’s 263A Computation Marketing, selling, and advertising costs are generally excluded.
Small businesses get a meaningful break. If your average annual gross receipts over the prior three tax years fall below the inflation-adjusted threshold in Section 448(c), you’re exempt from UNICAP entirely. The threshold is adjusted annually; check the most recent IRS revenue procedure for the current figure. Businesses below the line can deduct manufacturing and inventory-related overhead as a current expense like any other overhead.
Records You Need to Keep
Overhead deductions without documentation don’t survive an audit. The IRS requires you to keep records supporting every deduction until the statute of limitations for that return expires. In most cases that means holding receipts, invoices, bank statements, and canceled checks for at least three years after filing.14Internal Revenue Service. How Long Should I Keep Records
The retention period extends to six years if you fail to report more than 25 percent of your gross income, and to seven years if you claim a deduction for worthless securities or bad debt. For property you depreciate, keep the purchase records until the limitations period expires for the year you sell or dispose of the asset, since you’ll need the original cost basis to calculate gain or loss.
Employment tax records carry a four-year retention requirement measured from the later of the date the tax was due or the date it was paid. Because overhead often includes payroll for non-production employees, those records overlap heavily with your overhead documentation.
Penalties for Overhead Deductions Done Wrong
The IRS imposes a 20 percent accuracy-related penalty on any underpayment of tax caused by negligence or disregard of tax rules.15Internal Revenue Service. Accuracy-Related Penalty Negligence, in the IRS’s view, means failing to make a reasonable attempt to follow the tax laws. Claiming a deduction that “seems too good to be true” without checking its accuracy is one of the agency’s own examples.
The same 20 percent penalty applies to substantial understatements of income tax, defined as an understatement exceeding the greater of 10 percent of the correct tax or $5,000.16eCFR. 26 CFR 1.6662-2 – Accuracy-Related Penalty Deducting personal expenses as business overhead, expensing capital assets that should be depreciated, or ignoring UNICAP requirements can each produce understatements large enough to trigger it. The penalty is calculated on top of the additional tax owed, plus interest.