Contractors in the United States fall into five legal categories: general contractors, specialty trade contractors, independent contractors, subcontractors, and government contractors. The category a worker or business belongs to determines who pulls permits, who carries which insurance, who owes self-employment tax, and who can be held liable when something goes wrong. A single person can sit in more than one category at once. A self-employed electrician, for example, is both a specialty trade contractor and an independent contractor, and may also be a subcontractor on any given job.
General Contractors
A general contractor runs a construction or renovation project from start to finish. They coordinate the crews, schedule the suppliers, keep the work aligned with the architectural plans, and act as the single point of contact for the property owner. On the paperwork side, they pull building permits, schedule inspections, and keep the site in line with local safety codes.
Bonding is one of the markers that sets general contractors apart from other trades. On larger projects they are typically required to post surety bonds. A performance bond guarantees the owner that the work will be finished to spec. A payment bond guarantees that laborers, suppliers, and subcontractors on the job will be paid. For federal construction projects over $100,000, the Miller Act makes both bonds mandatory.1U.S. General Services Administration. The Miller Act
Licensing rules vary by state. Some states require a license for any project over a set dollar amount; others regulate only specific types of work. Initial and renewal fees typically run from around $50 to $800 depending on the state and license class. Every state licensing board keeps a public lookup tool where owners can confirm a contractor’s license is active and check for disciplinary history.
Insurance is the other baseline. A commercial general liability policy covers third-party bodily injury and property damage during the work, with a typical minimum of $1,000,000 per occurrence and $2,000,000 in the aggregate. Owners should ask for a certificate of insurance before work begins and confirm they are listed as an additional insured.
Specialty Trade Contractors
Specialty trade contractors work in a single technical discipline: electrical, plumbing, HVAC, roofing, carpentry, and similar fields. Where a general contractor coordinates the big picture, a specialty trade contractor does the hands-on installation and repair work. The systems they handle are tightly regulated because mistakes with wiring, gas lines, or pressurized plumbing create real safety hazards.
Most of these trades use a tiered licensing structure. A worker starts as an apprentice under a licensed professional, moves up to journeyman after passing an exam and logging enough supervised hours, and can eventually qualify as a master. Each tier carries its own scope of work. An apprentice usually cannot pull permits or work unsupervised, while a master-level plumber or electrician can design systems, supervise others, and sign off on inspections. Keeping these credentials current requires continuing education to track code changes.
Some federal certifications apply across state lines. HVAC technicians who work with refrigerants must hold EPA Section 608 certification under the Clean Air Act. The EPA requires anyone who maintains, services, or repairs equipment that could release refrigerants to pass an approved exam. Four certification types exist depending on the equipment involved, and apprentices are exempt only while working under the direct and continuous supervision of a certified technician.2US EPA. Section 608 Technician Certification Requirements
Insurance for specialty trades is tailored to the risks of the craft. A plumber carries high-limit coverage geared toward water damage claims; an electrician’s policy emphasizes fire hazard liability. These trade-specific policies sit on top of standard general liability coverage. Some trades also carry errors and omissions insurance, which covers claims from professional mistakes in design or specification.
Independent Contractors
“Independent contractor” describes a legal classification, not a trade. A freelance web developer, a self-employed plumber, and a consulting engineer can all be independent contractors. What ties them together is the legal relationship with the people paying them: the hiring party controls the result of the work but not how, when, or where the work gets done.3Internal Revenue Service. Independent Contractor Defined
How the IRS and DOL Classify Workers
The IRS looks at three broad areas when deciding whether someone is an employee or an independent contractor: behavioral control (does the company dictate how tasks are performed?), financial control (does the worker invest in their own tools and have the opportunity for profit or loss?), and the type of relationship (is there a written contract, and does the company provide benefits?). No single factor decides it. The IRS weighs the full picture of how the relationship actually operates.3Internal Revenue Service. Independent Contractor Defined
The Department of Labor uses a related but distinct framework called the “economic reality” test under the Fair Labor Standards Act. The DOL analysis focuses on whether a worker is economically dependent on the hiring company or genuinely in business for themselves. Two factors carry the most weight: how much control the worker has, and whether the worker has a real opportunity for profit or loss based on their own initiative and investment. Current DOL guidance emphasizes that actual working conditions matter more than what a contract says on paper.4U.S. Department of Labor. Fact Sheet 13 – Employment Relationship Under the Fair Labor Standards Act
Taxes and Business Structure
Independent contractors are treated as self-employed for tax purposes. Starting in 2026, businesses that pay a contractor $2,000 or more in a calendar year must report those payments on Form 1099-NEC. The prior threshold for payments made before 2026 was $600.5Internal Revenue Service. Form 1099-NEC and Independent Contractors The higher reporting threshold does not change a contractor’s obligation to report all income, including amounts below $2,000 that no one files a 1099 for.
The self-employment tax rate is 15.3%, covering both halves of Social Security (12.4%) and Medicare (2.9%).6Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax Employees split these contributions with their employer; independent contractors pay the full amount. The Social Security portion applies only to net earnings up to $184,500 in 2026.7Social Security Administration. Contribution and Benefit Base The Medicare portion has no cap, and an additional 0.9% Medicare tax applies on self-employment income above $200,000 for single filers or $250,000 for married couples filing jointly. Independent contractors can deduct the employer-equivalent half of the self-employment tax (7.65%) when calculating adjusted gross income. Because no employer is withholding, they generally need to make quarterly estimated tax payments.
Many independent contractors operate as sole proprietors by default, meaning the business and the owner are legally the same person. Every debt and every lawsuit can reach the owner’s personal accounts and property. Forming a single-member LLC creates a separate legal entity that shields personal assets from most business liabilities. The trade-off is paperwork: state formation fees, annual reports, and in some states franchise taxes.
Misclassification Risk
Getting the employee-versus-contractor classification wrong is one of the more expensive mistakes a business can make. A company that treats workers as independent contractors when they should be employees can face back taxes for income tax withholding, the employer’s share of Social Security and Medicare, plus penalties and interest. The IRS imposes additional assessments under Section 3509 for failure to withhold. Beyond taxes, misclassified workers may be owed overtime, benefits, and protections under the Fair Labor Standards Act. The IRS and DOL both actively audit for misclassification.
Subcontractors
A subcontractor works under a general contractor rather than directly for the property owner. When a general contractor wins a project to build an office complex, they hire subcontractors to handle specific portions: one company pours the concrete foundation, another frames the walls, another installs the electrical systems. The general contractor remains the single point of accountability to the owner, but the actual work flows through these secondary agreements.
Contracts between general contractors and subcontractors typically include flowdown clauses. These push the key terms of the prime contract down to the subcontractor, including quality standards, safety requirements, and project deadlines. In federal contracting, many of these flowdowns are mandatory by regulation.8Acquisition.GOV. 52.204-7 System for Award Management On private projects, the scope depends on what the parties negotiate, but a flowdown clause can bind a subcontractor to obligations they never directly agreed to, so reading the prime contract before signing matters.
Payment is where friction usually lives. Most subcontracts tie payment to the general contractor receiving funds from the owner first. A “pay-when-paid” clause is generally treated as a timing mechanism: the subcontractor will be paid, but only after the general contractor collects. A “pay-if-paid” clause is harsher and attempts to make the owner’s payment a condition for the subcontractor getting paid at all, shifting the risk of owner default. Many states refuse to enforce pay-if-paid clauses as against public policy, but enforceability varies widely.
When payment fails entirely, subcontractors have a powerful fallback: the mechanic’s lien. This is a legal claim that attaches to the property title. A subcontractor who has not been paid for labor or materials can file a lien that clouds the title and can block a sale or refinancing until the debt is resolved. Filing deadlines and procedural requirements vary significantly by state, and missing a deadline forfeits the right. Subcontractors need to know their state’s notice and filing rules from day one of a project, not after a payment dispute surfaces. One important boundary: mechanic’s liens cannot be placed on federal property, which is why the Miller Act’s payment bond exists as the substitute remedy on federal jobs.
Government Contractors
Government contractors sell goods or services to federal, state, or local agencies. The rules are substantially more complex than those for private-sector work, and compliance starts before a company even submits a bid.
Registration and Bidding
Any business that wants to bid on federal contracts must register in the System for Award Management (SAM). Registration requires a unique entity identifier, tax information validated by the IRS, a CAGE code, and representations about the company’s qualifications and compliance status. The registration must be active both at the time of the bid and at the time of award.8Acquisition.GOV. 52.204-7 System for Award Management Processing a new SAM registration can take weeks, so companies considering government work should apply well before any solicitation deadline.
The federal government also reserves a portion of contracts for small businesses through set-aside programs administered by the Small Business Administration.9U.S. Small Business Administration. Types of Contracts Competitive set-asides limit bidding to qualified small businesses when at least two could perform the work; sole-source set-asides go directly to a single business without competitive bidding.
FAR Compliance and Debarment
Federal contracts are governed by the Federal Acquisition Regulation, which sets uniform policies for how all executive agencies buy goods and services.10Acquisition.GOV. FAR Part 1 – Federal Acquisition Regulations System The FAR covers pricing, ethical standards, reporting requirements, and a long list of mandatory contract clauses, enforced through audits, investigations, and financial penalties.
The most severe consequence is debarment, which bars a company from bidding on or receiving any federal contract for a set period. The FAR authorizes debarment for fraud connected to a government contract, antitrust violations, embezzlement, false statements, willful failure to perform contract terms, and delinquent federal taxes exceeding $10,000.11Acquisition.GOV. 9.406-2 Causes for Debarment A history of unsatisfactory performance across multiple contracts can also trigger debarment.
Prevailing Wages and Bonds
Federal construction contracts over $2,000 are subject to the Davis-Bacon Act, which requires contractors and subcontractors to pay laborers and mechanics no less than the locally prevailing wage as determined by the Department of Labor. Workers must be paid at least once a week, without deductions beyond those permitted by the Copeland Act, and the applicable wage scale must be posted in a visible location at the job site.12Office of the Law Revision Counsel. 40 USC 3142 – Rate of Wages for Laborers and Mechanics The prevailing wage is not a flat national number; it varies by geographic area and job classification, so contractors need to check the specific wage determination attached to each contract.
For federal construction projects exceeding $100,000, the Miller Act requires the contractor to furnish both a performance bond and a payment bond before the contract is awarded.1U.S. General Services Administration. The Miller Act
Which Category Applies to You
The categories are not mutually exclusive, and the right question is usually which ones apply at once. The trade category (general or specialty) describes what the contractor does and determines licensing and insurance. The tax category (employee or independent contractor) describes the legal relationship with whoever is paying and determines who owes which taxes. The project role (prime contractor or subcontractor) describes where the contractor sits in the contract chain and determines payment rights and lien remedies. The customer category (private or government) determines which regulatory regime applies on top of everything else. A licensed master plumber who runs a small LLC and takes a job from a general contractor on a federal courthouse renovation is, at the same time, a specialty trade contractor, an independent contractor, a subcontractor, and a government contractor. Each label brings its own rules, and all of them apply.