Contract labor is work performed by an independent contractor hired to complete a specific job under an agreement, rather than by an employee on the payroll. The contractor decides how the work gets done, pays their own taxes, and receives none of the benefits or legal protections that come with employment. That single distinction, contractor versus employee, drives almost everything else about the arrangement: who owes payroll taxes, who carries the liability, who gets overtime, and who pays for health insurance.
How Contract Labor Differs from Employment
The clearest way to understand contract labor is to line it up against a traditional job.
An employee shows up when and where the employer says, uses the employer’s tools, and follows the employer’s methods. The employer withholds income tax, Social Security, and Medicare from every paycheck, pays the matching employer share, funds unemployment insurance, and carries workers’ compensation coverage. Minimum wage and overtime rules under the Fair Labor Standards Act apply. Health coverage, paid leave, and retirement contributions may come with the job.
A contractor operates differently on every one of those points. They set their own hours and methods within the bounds of the contract, generally supply their own equipment, and invoice for their work. Nothing is withheld from their payments. They owe self-employment tax on top of income tax, they aren’t covered by workers’ comp or unemployment insurance, and FLSA wage-and-hour protections don’t reach them. Benefits are their own problem.
Liability shifts too. An employer is generally on the hook for what its employees do on the job. A contractor bears responsibility for their own work, including errors, injuries, and property damage, which is why most hiring entities require contractors to carry general liability insurance and, for professional services, errors-and-omissions coverage. Workers’ compensation only covers W-2 employees, so a contractor injured on a job site has no state workers’ comp claim. Occupational accident insurance exists as a private-market substitute, but the benefits are narrower than workers’ comp and it typically doesn’t cover occupational diseases.
How a Worker Is Classified
Calling someone a contractor doesn’t make them one. Federal agencies and many states use their own tests, and the labels in a contract don’t override how the relationship actually works day to day.
The IRS Common Law Test
The IRS looks at three broad categories: behavioral control (whether the business directs what the worker does and how they do it), financial control (how the worker is paid, whether expenses are reimbursed, who supplies the tools), and the nature of the relationship (written contracts, employee-type benefits, and whether the arrangement is expected to continue indefinitely).1Internal Revenue Service. Employee (Common-Law Employee) No single factor decides it. The IRS weighs the full picture, and two arrangements that look similar on paper can come out differently based on how much real-world control the business exercises.2Internal Revenue Service. Independent Contractor (Self-Employed) or Employee?
The DOL Economic Reality Test
The Department of Labor uses a different framework under the FLSA, asking whether the worker is economically dependent on the hiring business or genuinely in business for themselves. The DOL rule that took effect in March 2024 identifies several factors, including the nature and degree of control over the work, the worker’s opportunity for profit or loss, the skill required, the permanence of the relationship, and whether the work is part of the hiring entity’s core operations.3eCFR. 29 CFR Part 795 – Employee or Independent Contractor Classification Under the Fair Labor Standards Act What actually happens on the ground matters more than what the contract says.
The ABC Test
Roughly two dozen states use a stricter standard called the ABC test, which presumes a worker is an employee unless the hiring entity proves all three prongs: the worker is free from the company’s control and direction, the work falls outside the company’s usual business, and the worker has an independently established trade or business of their own. California adopted it through the state Supreme Court’s Dynamex decision. The ABC test is harder for businesses to satisfy than the IRS or DOL tests, so companies hiring contractors in those states face a higher bar.
Requesting an Official Determination
Either the worker or the business can file IRS Form SS-8 to ask the IRS to determine the worker’s status for federal tax purposes.4Internal Revenue Service. About Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding The process takes time, but a formal ruling can prevent larger problems later.
Taxes on Contract Labor Income
Taxes are where contract labor departs most sharply from a regular paycheck. Nobody withholds anything, and the IRS expects you to pay as you go.
Self-Employment Tax
Contractors pay self-employment tax at a combined 15.3%, covering both the employer and employee shares of Social Security and Medicare. That’s 12.4% for Social Security and 2.9% for Medicare.5Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The Social Security portion applies only to the first $184,500 of net earnings in 2026.6Social Security Administration. What Is the Current Maximum Amount of Taxable Earnings for Social Security Medicare has no cap, and self-employment income above $200,000 (or $250,000 if married filing jointly) triggers an additional 0.9% Medicare surcharge on the excess.7Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
One offset: contractors can deduct half of their self-employment tax when calculating adjusted gross income. That reduces income tax but not the self-employment tax itself.5Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Quarterly Estimated Payments
Because no employer is withholding on your behalf, the IRS requires contractors to make quarterly estimated tax payments covering both income tax and self-employment tax. For 2026 the deadlines are:
- April 15, 2026: first quarter payment
- June 15, 2026: second quarter payment
- September 15, 2026: third quarter payment
- January 15, 2027: fourth quarter payment
Miss a deadline and an underpayment penalty follows. You can avoid it by paying at least 90% of your current-year tax liability or 100% of last year’s tax, whichever is smaller.8Internal Revenue Service. Topic No. 306, Penalty for Underpayment of Estimated Tax If your income swings hard from quarter to quarter, the annualized installment method lets you vary the payments instead of splitting the year into four equal amounts.9Taxpayer Advocate Service. Your Tax To-Do List: Important Tax Dates for 2026
Deductible Business Expenses
Contractors can deduct ordinary and necessary business expenses from taxable income, including home office costs, vehicle mileage for business travel, supplies, software, and professional development.10Internal Revenue Service. Credits and Deductions for Businesses Keep receipts and records. The IRS is more likely to scrutinize a Schedule C than a W-2 filer’s return.
One change to watch for 2026: the Section 199A qualified business income deduction, which let eligible self-employed individuals deduct up to 20% of qualified business income, expired at the end of 2025.11Internal Revenue Service. Qualified Business Income Deduction Unless Congress revives it, contractors will see a noticeable increase in their effective tax rate for 2026.
What the Hiring Business Owes
A business paying contract labor does not withhold income tax, Social Security, or Medicare from the payments. It doesn’t provide unemployment insurance or workers’ compensation coverage either.
What it does have to do is collect a Form W-9 from the contractor before paying them, capturing the legal name, business name, address, and taxpayer identification number.12Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification If a contractor doesn’t provide a valid TIN, the hiring entity must withhold 24% of all payments as backup withholding and send it to the IRS.13Internal Revenue Service. Backup Withholding
At year-end, the business files Form 1099-NEC for every contractor paid $600 or more, reporting the total in Box 1.14Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC Both the IRS copy and the contractor’s copy are due by January 31 of the following year. Late or inaccurate 1099s draw penalties that grow the longer the form goes unfiled.
When the Classification Is Wrong
Treating someone as a contractor when they’re really an employee is one of the more expensive mistakes a business can make, and both the IRS and the Department of Labor pursue it through audits and investigations.
An employer that misclassifies workers faces liability for unpaid employment taxes, including the employer’s share of Social Security and Medicare plus the income tax that should have been withheld. Under IRC Section 3509, the penalty rates are reduced if the business at least filed 1099s for the misclassified workers, and roughly double if it didn’t. Interest runs on the unpaid amounts back to when the taxes should have been paid.2Internal Revenue Service. Independent Contractor (Self-Employed) or Employee?
Workers on the wrong end of misclassification lose access to minimum wage and overtime protections under the FLSA, unemployment insurance, employer-sponsored health coverage, and retirement plan contributions.3eCFR. 29 CFR Part 795 – Employee or Independent Contractor Classification Under the Fair Labor Standards Act They also pay the full 15.3% self-employment tax instead of splitting the FICA obligation with an employer. A worker who believes they’ve been misclassified can file Form SS-8 with the IRS to request a formal determination or file a wage complaint with the Department of Labor.4Internal Revenue Service. About Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding