Burden in accounting is the collection of indirect costs a business absorbs to employ workers and operate production facilities beyond direct wages and raw materials. It covers payroll taxes, workers’ compensation, benefits, paid time off, rent on the plant, equipment depreciation, utilities, indirect labor, and similar overhead. Businesses track burden because pricing that only covers direct costs quietly loses money on everything the direct costs don’t touch. A burden rate translates that overhead into a per-hour or per-unit figure you can attach to specific jobs.
What Labor Burden Includes
Labor burden is every cost of employing someone beyond base pay. The biggest mandatory piece is payroll tax under the Federal Insurance Contributions Act. Employers pay 6.2% of each employee’s wages toward Social Security and 1.45% toward Medicare.1Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates The Social Security portion applies only to the first $184,500 of wages in 2026, so the per-employee cost caps once wages cross that line.2Social Security Administration. Contribution and Benefit Base Medicare has no earnings cap; the 1.45% applies to every dollar.
Federal unemployment tax is next. The statutory rate is 6.0% on the first $7,000 of each employee’s annual wages.3Internal Revenue Service. Topic No. 759, Form 940 – Employers Annual Federal Unemployment (FUTA) Tax Return Most employers get a 5.4% credit for paying state unemployment tax on time, cutting the effective federal rate to 0.6%. That credit shrinks if your state has borrowed from the federal unemployment trust and failed to repay within the allowed window.4Internal Revenue Service. FUTA Credit Reduction State unemployment taxes stack on top of the federal obligation, and employer rates typically run from near zero to around 10% depending on state and claims history.
Workers’ compensation insurance is mandatory in nearly every state.5U.S. Department of Labor. Workers’ Compensation Premiums swing hard by industry risk. An office worker might cost $0.20 per $100 of payroll while a construction or manufacturing employee can run several dollars per $100, making workers’ comp one of the more volatile pieces of the calculation.
Then come voluntary benefits: employer-paid health premiums, retirement contributions such as 401(k) matches, and paid time off. PTO is easy to overlook because it never arrives as an invoice. You pay full wages and full burden on hours where nothing is produced. An employee at $25 per hour with three weeks of paid vacation costs roughly $3,000 in base wages alone for those idle hours, before the taxes and benefits accruing on top.
What Factory Burden Includes
Factory burden is the cost of running the physical space and equipment where production happens. It splits into two groups that behave very differently as output changes.
Fixed Factory Costs
Fixed costs stay roughly level whether you make 100 units or 10,000. Rent or mortgage on the production facility, property taxes, and insurance on the building and equipment all sit here. Depreciation on heavy machinery is another major fixed cost; most companies spread it evenly across the equipment’s useful life, so the monthly charge doesn’t move with volume. Together these costs form a floor of overhead the business pays regardless of how busy the shop is.
Variable Factory Costs
Variable costs rise and fall with output. Electricity, gas for furnaces, lubricants, and consumables like sandpaper or cutting fluid all climb as the line runs more hours. Maintenance and repair tend to be semi-variable: there is a baseline for scheduled upkeep, and breakdowns get more frequent the harder equipment runs. Salaries for indirect labor such as plant supervisors and quality inspectors also belong in factory burden. They don’t assemble products, but production can’t happen without them.
How to Calculate a Burden Rate
A burden rate turns a pool of indirect costs into a per-unit or per-hour figure you can attach to jobs. The formula is straightforward:
Burden Rate = Estimated Indirect Costs รท Estimated Allocation Base
Start by gathering every indirect cost into one pool for the period, usually a fiscal year. Pull the labor burden from payroll records and the factory burden from the general ledger, add them together, and you have your numerator.
The allocation base is where judgment enters. For labor-heavy operations, direct labor hours make sense because overhead tracks how many hours the team is on the floor. For capital-intensive shops where machines do the heavy lifting, machine hours are the better base. Some businesses split overhead into multiple pools with different bases: utility costs might track machine hours while quality control tracks labor hours. The choice matters more than most people realize. A poor base spreads costs unevenly and can make one product line look profitable while another looks like a loser, when reality is the reverse.
Why Companies Use Estimates
Waiting for actual year-end numbers means you can’t price jobs, quote customers, or evaluate profitability until the books close months later. A predetermined rate assigns overhead to each job in real time. The tradeoff is that estimates are never exact, which produces a variance to reconcile at year-end.
Applying the Rate to a Job
Once the rate is set, applying it is multiplication. A rate of $20 per direct labor hour on a 50-hour job pushes $1,000 of overhead onto that job. Combined with direct materials and direct labor already tracked, that gives you the full production cost, which is the number that matters for pricing.
A worked example: a furniture shop estimates $120,000 in indirect costs for the year and expects 6,000 direct labor hours. The burden rate is $20 per labor hour. A dining table taking 15 hours of direct labor absorbs $300 in overhead. If the wood costs $200 and the direct labor costs $375, the full production cost is $875. Without the burden allocation the shop might think the table costs $575 and price it at $700, congratulating itself on a margin that doesn’t exist.
Over-Applied and Under-Applied Burden
Because the rate uses estimates, applied overhead almost never matches actual overhead. The gap has to be reconciled before the books close.
If you applied more than you spent, the overhead is over-applied. Cost of goods sold is overstated, and an adjusting entry reduces it by the excess. If actual costs exceeded what you applied, the overhead is under-applied. Cost of goods sold is understated, and the adjusting entry increases it.
Most companies push the whole year-end adjustment into cost of goods sold. When the variance is large, some firms split it across work in process, finished goods inventory, and cost of goods sold in proportion to each account’s balance. Persistent under-application often signals that the allocation base or the cost estimates need updating for the next cycle.
Burden in Service Businesses
Burden is not just a manufacturing concept. Any business that bills for labor, from consulting firms to HVAC contractors, needs its burdened labor rate to price work profitably. The math is the same: add every indirect cost of employing someone to their base wage, then divide by billable hours.
A field technician earning $25 per hour might actually cost $38 to $42 per hour once payroll taxes, workers’ comp, health insurance, vehicle costs, and paid time off are layered in. A company billing $50 per hour thinking it doubles the $25 wage has a real margin closer to $8. Service businesses that skip this math consistently underprice, particularly during growth phases when overhead climbs faster than revenue.
The difference from manufacturing is where the burden lands. There is no inventory to capitalize costs into, so service burden flows straight to the income statement as a period cost.
Where Burden Lands on the Financial Statements
For manufacturers, burden costs follow the products they’re attached to. While a product sits in the warehouse, its share of absorbed overhead is capitalized into the inventory value on the balance sheet, held as an asset rather than recognized as an expense. When the product sells, its full cost, including the allocated burden, moves to cost of goods sold on the income statement.
This is different from period costs like marketing, executive salaries, and general administration, which hit the income statement immediately regardless of production or sales. The distinction affects two numbers investors and lenders watch closely: gross profit margin, which reflects production efficiency including burden, and total asset value, which includes overhead embedded in unsold inventory.
IRS Rules on Capitalizing Indirect Costs
How you handle burden in the books is not purely an internal choice. Section 263A of the Internal Revenue Code, known as the uniform capitalization rules, requires businesses that produce or acquire property for resale to capitalize direct costs and their proper share of indirect costs into inventory.6Office of the Law Revision Counsel. 26 U.S. Code 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses In practice, the IRS will not let you deduct factory rent, equipment depreciation, utilities, indirect labor, insurance, and similar overhead as a current expense when those costs relate to production. They have to be folded into inventory cost and deducted only when the inventory sells.7Internal Revenue Service. Publication 538, Accounting Periods and Methods
The list of costs the IRS requires you to capitalize maps closely to the labor and factory burden categories above. It includes indirect labor, officer compensation, pension and benefit expenses, workers’ comp, depreciation on production equipment, rent, property taxes, utilities, repairs, insurance, and quality control, among others.8eCFR. 26 CFR 1.263A-1 – Uniform Capitalization of Costs
Smaller businesses get a break. If your average annual gross receipts over the prior three tax years don’t exceed $32 million, the inflation-adjusted threshold for 2026, you are exempt from Section 263A entirely.9Internal Revenue Service. Revenue Procedure 2025-32 Below that line you have more flexibility in how you treat indirect costs for tax purposes. Above it, your burden accounting has to satisfy the IRS capitalization rules or you risk having deductions disallowed on audit.