A contract of service is an employment agreement; a contract for service is an agreement to hire an independent contractor for a specific result. That single distinction decides who withholds taxes, who carries workplace protections, and who absorbs the financial risk of the work. In the United States, the label written across the top of the document doesn’t control the answer. Both the IRS and the Department of Labor look past the paperwork to how the work actually gets done, and they can reach different conclusions about the same worker.
The Core Difference
Under a contract of service, the worker becomes part of the business. They show up at the employer’s location, follow internal policies, use company tools, and report to a manager who directs not just what gets done but how. The role is usually ongoing and existed before this particular person filled it. The employer sets the schedule, provides training, and takes on the obligations that come with hiring: withholding taxes, paying into unemployment and workers’ compensation, and complying with federal labor protections.
Under a contract for service, someone is hired to deliver a specific result. The client cares about the outcome, not the process. A freelance developer building a website or a consultant restructuring a supply chain typically works this way. They pick their own hours, use their own equipment, and decide their own approach. The engagement has a clear endpoint, and the contractor generally takes on other clients at the same time. They also absorb the financial risk. If the job takes longer than expected or materials cost more than planned, that loss belongs to the contractor.
Two signals separate the arrangements more than any other. First, integration: is the worker embedded in the business or delivering to it from outside? Second, risk: does the worker stand to lose money if the work goes badly, or are they paid the same either way?
How the IRS Decides Which One You Actually Have
The IRS evaluates three categories of evidence to determine whether a worker is an employee or an independent contractor.1Internal Revenue Service. Worker Classification 101: Employee or Independent Contractor
- Behavioral control: does the business direct how the work is done, including methods, sequences, tools, and training?
- Financial control: who provides supplies, are expenses reimbursed, and can the worker realize a profit or suffer a loss?
- Type of relationship: are there written contracts, employee-type benefits like insurance or a pension, and is the work ongoing or tied to a specific project? Is the work a core part of the business?
No single factor decides it. The IRS weighs the full picture, and the right to control the work matters even when the employer doesn’t actually exercise that control day to day.2Internal Revenue Service. Employee (Common-Law Employee)
How the Department of Labor Decides
The Department of Labor applies a separate framework when the question is whether a worker qualifies as an employee under the Fair Labor Standards Act. Rather than focusing narrowly on control, the DOL asks whether the worker is economically dependent on the employer or genuinely in business for themselves. Six factors guide that analysis: the worker’s opportunity for profit or loss, each side’s investments in the work, the permanence of the relationship, the nature and degree of control, how integral the work is to the employer’s main business, and the skill and initiative the worker brings.3U.S. Department of Labor. Fact Sheet 13: Employment Relationship Under the Fair Labor Standards Act
The IRS and DOL tests overlap heavily, but they don’t always reach the same conclusion for the same worker. A business can be in compliance with one agency and out of compliance with the other.
What Each Side Pays and Reports
When You Hire an Employee
Employer and employee split payroll taxes. Each pays 6.2 percent for Social Security and 1.45 percent for Medicare, or 7.65 percent per side.4Internal Revenue Service. Topic No 751, Social Security and Medicare Withholding Rates Social Security tax applies only to earnings up to $184,500 in 2026.5Social Security Administration. Contribution and Benefit Base The employer withholds the employee’s share from each paycheck, remits both halves along with federal income tax withholding, and reports the year on Form W-2.
Employers also pay federal unemployment tax at 6.0 percent on the first $7,000 of each employee’s wages. Employers who pay state unemployment tax on time and in full can claim a credit of up to 5.4 percent, dropping the effective FUTA rate to 0.6 percent.6Internal Revenue Service. Topic No 759, Form 940, Employers Annual Federal Unemployment Tax Act (FUTA) Tax
When You Hire an Independent Contractor
You withhold nothing. No income tax, no Social Security, no Medicare, no FUTA. If you paid a contractor $600 or more during the year for services in your trade or business, you report the total on Form 1099-NEC.7Internal Revenue Service. Reporting Payments to Independent Contractors The contractor handles their own tax obligations. That cost shift makes contractors look cheaper on paper, and it is exactly why misclassification is tempting and expensive.
Contractors themselves owe self-employment tax of 15.3 percent on their net earnings: 12.4 percent for Social Security and 2.9 percent for Medicare, effectively covering both the employer and employee shares.8Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) Earnings above $200,000 (or $250,000 for married couples filing jointly) trigger an additional 0.9 percent Medicare tax.9Internal Revenue Service. Topic No 560, Additional Medicare Tax Because no one withholds along the way, contractors make quarterly estimated tax payments on April 15, June 15, September 15, and January 15 of the following year, generally required when they expect to owe $1,000 or more for the year.10Internal Revenue Service. Estimated Tax
Protections Employees Have and Contractors Don’t
The Fair Labor Standards Act requires employers to pay at least the federal minimum wage of $7.25 per hour and time-and-a-half overtime for any hours worked beyond 40 in a workweek. Many states set higher minimums, but the federal floor applies to employees everywhere.11U.S. Department of Labor. Wages and the Fair Labor Standards Act12U.S. Department of Labor. Family and Medical Leave Act13U.S. Department of Labor. Employee Eligibility – elaws – Family and Medical Leave Act Advisor
Employees are also generally covered by their employer’s workers’ compensation insurance and build eligibility for unemployment benefits when work ends through no fault of their own. None of these protections extend to independent contractors. Someone working under a contract of service has a safety net. Someone under a contract for service is building one from scratch.
What Misclassification Costs
The federal penalties for treating an employee as an independent contractor are calculated as percentages of unpaid taxes rather than flat per-worker fines. When an employer misclassifies a worker and fails to withhold employment taxes, the IRS imposes reduced-rate liability of 1.5 percent of wages paid for income tax withholding, plus 20 percent of the employee’s share of Social Security and Medicare taxes that should have been withheld.14Office of the Law Revision Counsel. 26 USC 3509 – Determination of Employers Liability for Certain Employment Taxes
Those rates double if the employer also failed to file the required 1099 forms: 3 percent of wages for income tax and 40 percent of the employee’s FICA share. The employer who skipped the 1099 paperwork tends to be the same employer who wasn’t tracking payroll carefully to begin with, which is where misclassification gets expensive fast.
The Department of Labor can add civil money penalties of up to $2,515 per violation for repeated or willful failures to pay proper minimum wages or overtime, which are the violations that typically surface when a misclassified worker files a complaint.15U.S. Department of Labor. Civil Money Penalty Inflation Adjustments
Penalties stack. A company that misclassified ten workers over three years faces back taxes, interest, and penalties across every worker for every year, and courts can order the employer to pay all the benefits those workers should have received, including overtime, health insurance contributions, and retirement plan matching.
If You’re Not Sure Which Contract You Have
Either the business or the worker can file IRS Form SS-8 to request an official determination of the working relationship for federal tax and withholding purposes. The form asks detailed questions about how the work is performed, and the IRS issues a ruling.16Internal Revenue Service. About Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding
Businesses that have been treating workers as contractors can also seek protection under Section 530 of the Revenue Act of 1978. That safe harbor shields a business from back employment taxes if three conditions are met: the business filed all required 1099 forms consistently treating the worker as a non-employee, it never treated anyone in a substantially similar role as an employee after 1977, and it had a reasonable basis for the classification. A reasonable basis can come from a prior IRS audit that didn’t reclassify the workers, published court decisions or IRS rulings, or a longstanding practice in the industry.17Internal Revenue Service. Worker Reclassification – Section 530 Relief
Section 530 is interpreted in the business’s favor, but only when the paperwork was clean from the start. A business that never filed 1099s for a worker it claimed was independent has already failed the first requirement. Getting classification right early is cheap. Fixing it retroactively is not.