Is Labor an Operating Expense or Cost of Goods Sold?

Labor is cost of goods sold when the worker directly produces a product or delivers a billable service, and an operating expense when the worker supports the business in a general way that can’t be traced to a specific unit of output. That single test — whether you can tie the hours to something you sell — decides whether labor is an operating expense or cost of goods sold on your books, and it shapes your gross margin, your tax treatment, and how clearly your financials reflect the business.

Labor That Belongs in Cost of Goods Sold

Direct labor covers wages paid to employees who physically make a product or run production equipment. Under Generally Accepted Accounting Principles, those wages aren’t expensed the moment you pay them. They’re capitalized into the value of your inventory on the balance sheet and stay there until the product sells.

The matching principle is the reason. The cost of building a widget should hit the income statement in the same period as the revenue from selling that widget. If an assembly worker earns $25 per hour to make a widget, that $25 rides along in inventory value until a customer buys it. When the sale closes, the labor cost moves to COGS and is matched against the revenue it helped generate.

Service businesses have a direct-cost equivalent even though nothing physical comes off a line. Wages paid to attorneys, consultants, or engineers doing billable client work are classified as cost of services — sometimes called cost of revenue — and function the way COGS does for a manufacturer. A senior consultant billing at $300 per hour is a direct cost of revenue when that time is applied to a specific engagement. Support roles in the same firm, such as receptionists, file clerks, and office managers, stay in operating expenses.

Labor That Belongs in Operating Expenses

Indirect labor is wages you pay to people who keep the business running but don’t produce anything you sell. HR, accounting, marketing, and office management all fit here. On the income statement, these wages show up as Selling, General, and Administrative (SG&A) expenses, reducing operating income rather than gross profit.

The IRS treats these wages as ordinary and necessary business expenses under Section 162 of the Internal Revenue Code, which covers “a reasonable allowance for salaries or other compensation for personal services actually rendered.”¹ SG&A labor is fully deductible in the year you pay it, with no capitalization or amortization spreading the deduction across future years.

A useful trait of operating-expense labor is that it tends to hold steady regardless of production volume. Whether your factory ships 1,000 units or 10,000 units in a month, the HR manager’s salary is the same. Watching SG&A labor separately from production labor helps you tell whether overhead is growing in proportion to revenue or drifting out of line.

Why the Classification Matters

Putting direct labor in the wrong bucket distorts the financial picture in two directions at once. Gross margin looks higher than it really is, because production costs aren’t being subtracted from revenue. Operating income looks lower, because those same costs are pulling down line items below gross profit. In a period of heavy production and slow sales, this can make a profitable manufacturing operation look like it has an overhead problem when the real issue is inventory buildup.

The service-firm version of the same problem is easier to see when the classifications are clean. If billable staff generate revenue that comfortably exceeds their fully loaded salaries, but administrative costs are climbing faster than revenue, partners can locate the pressure point instead of guessing at it. That clarity feeds directly into hourly rates, project pricing, and hiring decisions.

Uniform Capitalization Rules for Inventory Costs

For tax purposes, Section 263A of the Internal Revenue Code reaches further than basic GAAP. It requires certain businesses to capitalize both direct and indirect costs — labor included — into the value of inventory. These uniform capitalization rules, usually called UNICAP, sweep in a share of indirect labor tied to production, such as wages for factory supervisors, quality control inspectors, and maintenance staff who support the production process.²

Small businesses are exempt. If your average annual gross receipts over the prior three years fall at or below the threshold set in Section 448(c) — a base of $25 million, adjusted upward each year for inflation — UNICAP doesn’t apply.² Above the threshold, you have to allocate a portion of direct production wages and certain indirect labor costs to inventory. Those costs sit on the balance sheet until the inventory is sold and then move to COGS.

Research and Development Labor

R&D labor runs on its own track under Section 174 of the Internal Revenue Code. From 2022 through 2024, businesses had to capitalize domestic R&D labor and amortize it over five years rather than deducting it right away.³ Starting in 2025, Congress restored immediate deductibility for domestic qualified research expenses, so those labor costs can once again be deducted in the year they’re incurred.

Foreign R&D labor still has to be amortized over 15 years. And administrative staff who only indirectly support research — payroll staff cutting checks for researchers, HR staff hiring lab employees, accountants tracking research budgets — don’t count as R&D labor.³ Only workers who perform, supervise, or directly support R&D activities qualify. Everyone else falls back into regular SG&A.

The Full Cost Behind Either Category

Whichever bucket a worker’s wages land in, the wage itself isn’t the whole cost. Payroll taxes, insurance, and benefits pile on top, and the same add-ons apply whether you’re capitalizing the labor into inventory or expensing it as SG&A.

Payroll Taxes

Every employer pays the employer share of FICA: 6.2% for Social Security and 1.45% for Medicare on each employee’s wages. Social Security tax applies only up to an annual wage base; Medicare has no cap, so the 1.45% applies to all covered wages.⁴

Federal unemployment tax (FUTA) is 6.0% on the first $7,000 of wages paid to each employee per year.⁴ Employers who pay state unemployment taxes on time can claim a credit of up to 5.4% against the federal rate, bringing the effective FUTA rate down to 0.6%.⁵ State unemployment tax rates vary by industry, layoff history, and the state where the employee works. FUTA is paid entirely by the employer and is never withheld from an employee’s wages.

Benefits and Insurance

Health insurance premiums are often the largest single benefit expense, and employer contributions to retirement plans such as 401(k) matching can add several more percentage points. Bonuses, commissions, and paid time off all contribute to the fully loaded cost of a worker.

Workers’ compensation insurance is mandatory in most jurisdictions. Premiums track the risk level of the job — a desk employee costs far less to insure than a construction worker or machine operator — and are usually expressed as a cost per $100 of payroll based on industry classification codes. The employer carries this cost; employees can’t be asked to contribute toward workers’ compensation premiums.

Overtime

Federal law requires employers to pay non-exempt employees at least 1.5 times their regular rate for hours worked beyond 40 in a workweek. Whether an employee is “exempt” depends on both job duties and salary. The Department of Labor currently enforces a minimum salary threshold of $684 per week ($35,568 per year) for executive, administrative, and professional exemptions; employees paid less than that must receive overtime pay regardless of their job duties.⁶ Overtime obligations affect both COGS budgets for production workers and operating expense budgets for non-exempt administrative staff.

Employee or Independent Contractor

Before you decide where labor sits on the income statement, you have to decide how the worker is classified in the first place. A W-2 employee brings employer FICA, federal and state unemployment taxes, and typically benefits. A 1099 contractor gets the agreed rate and nothing more. The gap can run 20% to 30% of compensation.

Misclassifying an employee as a contractor to sidestep those costs carries real consequences. The Department of Labor has stated that misclassification can deny workers minimum wage, overtime pay, and other protections under the Fair Labor Standards Act.⁷ On the tax side, the IRS can assess back employment taxes plus penalties under Section 3509 of the Internal Revenue Code. Filing 1099s for the misclassified workers keeps the penalty rates lower; not filing any information returns roughly doubles them.

The federal “economic reality” test asks whether the worker is economically dependent on you for work, which points toward employee status, or genuinely runs their own business, which points toward contractor status. Control over the work and the worker’s real opportunity to profit or lose based on their own initiative and investment carry the most weight. When a specific worker’s status is unclear, either party can file Form SS-8 with the IRS to request a formal determination.

1
Office of the Law Revision Counsel. 26 USC 162 – Trade or Business Expenses
2
Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses
3
Internal Revenue Service. Guidance on Amortization of Specified Research or Experimental Expenditures Under Section 174
4
Internal Revenue Service. Publication 15 (2026), Employer’s Tax Guide
5
Internal Revenue Service. Publication 926 (2026), Household Employer’s Tax Guide
6
U.S. Department of Labor. Earnings Thresholds for the Executive, Administrative, and Professional Exemption
7
U.S. Department of Labor. Employee or Independent Contractor Classification Under the Fair Labor Standards Act