A subcontractor is an independent business that a general contractor hires to perform a specific portion of a larger project, using its own labor, tools, and judgment to deliver a defined scope of work. The general contractor runs the overall job for the project owner; the subcontractor handles a specialized piece of it, such as electrical, plumbing, structural engineering, or database development. Because the subcontractor’s agreement is with the general contractor and not the owner, the general contractor is the one who pays the subcontractor, coordinates its schedule, and answers to the owner if the work falls short.
How the Subcontracting Chain Works
Three parties sit in the typical chain. The project owner hires a general contractor to deliver the finished result. The general contractor then brings in subcontractors for portions of the work that need specialized skill, equipment, or licensing. A subcontractor on a commercial building might never speak with the property owner at all. Deadlines, quality standards, and payment all run through the general contractor’s agreement.
A subcontractor is not the same as a material supplier. A supplier sells off-the-shelf products such as lumber, pipe, or concrete to whoever orders them. A subcontractor performs part of the contract itself, producing a result tailored to the specific project. That difference matters for tax reporting, lien rights, and insurance requirements.
Subcontractor vs. Employee
The legal line between a subcontractor and an employee turns on how much control the hiring party exercises over the work. If you set your own hours, use your own tools, serve multiple clients, and decide how to get the job done, you look like an independent contractor. If someone tells you when to show up, supervises your methods, and you work exclusively for them, you look like an employee no matter what the contract says.
The Department of Labor applies an “economic reality test” that weighs several factors, including whether the worker can profit or lose money based on their own decisions, whether they have made genuine business investments such as buying equipment or marketing their services, and how much control the hiring party holds over scheduling, pricing, and work assignments.1U.S. Department of Labor. Fact Sheet 13: Employee or Independent Contractor Classification Under the Fair Labor Standards Act No single factor decides the question. A highly skilled welder still looks like an employee if they do not choose their own jobs, do not set prices, and do not use those skills to build an independent business.
Classifying someone wrong carries real consequences for the hiring company. Misclassified workers lose access to minimum wage protections, overtime pay, and employer-funded benefits like workers’ compensation and Social Security contributions.2U.S. Department of Labor. Misclassification of Employees as Independent Contractors Under the Fair Labor Standards Act The Department of Labor has made enforcement a priority, noting that businesses that misclassify also gain an unfair cost advantage over competitors who follow the rules.3Federal Register. Employee or Independent Contractor Classification Under the Fair Labor Standards Act The IRS runs its own classification analysis and can reclassify workers retroactively, triggering back taxes, penalties, and interest for the hiring firm.4Internal Revenue Service. Independent Contractor (Self-Employed) or Employee?
What Subcontractors Owe in Taxes
Because no employer withholds anything from your pay, the entire tax burden falls on you. The biggest surprise for first-time subcontractors is self-employment tax: you owe both the employee and the employer shares of Social Security and Medicare, which comes to 15.3% of your net earnings. That breaks down to 12.4% for Social Security and 2.9% for Medicare.5Internal Revenue Service. Self-Employed Individuals Tax Center The Social Security portion applies only to the first $184,500 of net earnings in 2026; Medicare has no cap.6Social Security Administration. Contribution and Benefit Base All of that sits on top of your regular income tax.
There is some relief built in. You can deduct the employer-equivalent half of your self-employment tax (7.65%) when calculating your adjusted gross income, which reduces the income tax you owe even though it does not reduce the self-employment tax itself.7Internal Revenue Service. Topic No. 554, Self-Employment Tax Subcontractors may also qualify for the Section 199A qualified business income deduction, which allows eligible pass-through businesses to deduct up to 20% of their qualified business income, subject to income limits and phase-outs that depend on your filing status and the type of business you run.
Paying Taxes Quarterly
Without an employer handling withholding, you are expected to pay taxes as you earn throughout the year. The IRS divides the year into four payment periods:8Internal Revenue Service. Estimated Tax
- January 1 through March 31: payment due April 15
- April 1 through May 31: payment due June 15
- June 1 through August 31: payment due September 15
- September 1 through December 31: payment due January 15 of the following year
You generally need to make estimated payments if you expect to owe $1,000 or more when you file your return.9Internal Revenue Service. Estimated Taxes Missing a deadline triggers an underpayment penalty based on how much you underpaid and the IRS’s published quarterly interest rate for the period you were late.10Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty You can avoid the penalty entirely if your total payments cover at least 90% of your current-year tax or 100% of last year’s tax (110% if your adjusted gross income exceeded $150,000).
1099-NEC Reporting
Any general contractor who pays you $600 or more during the tax year is required to report those payments to the IRS on Form 1099-NEC.11Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC You receive a copy, and the IRS receives one too, so your reported income needs to match. If you do not receive a 1099 for smaller jobs, you still have to report the income. The IRS requires you to file a return once your net self-employment earnings reach $400.
Failing to report and pay what you owe results in a failure-to-pay penalty of 0.5% of the unpaid amount for each month or partial month the balance remains outstanding, up to a maximum of 25%. The IRS also charges interest on top of the penalty until you pay in full.12Internal Revenue Service. Failure to Pay Penalty
Paperwork and Insurance Before You Start
Before you can set foot on a job, the general contractor will need several documents. The paperwork protects the general contractor from tax liability if something goes wrong, and it satisfies the insurance requirements flowing down from the project owner’s master contract.
EIN and the W-9
You will need an Employer Identification Number (EIN), which functions as your business’s federal tax ID. It is required for paying federal taxes, hiring employees of your own, opening business bank accounts, and applying for trade licenses.13U.S. Small Business Administration. Get Federal and State Tax ID Numbers The general contractor will also ask you to complete IRS Form W-9, which collects your taxpayer identification number and legal name so they can file your 1099-NEC accurately at year end.14Internal Revenue Service. Form W-9 (Rev. March 2024)
Hand over the W-9 promptly. If you fail to provide a correct taxpayer identification number, the general contractor is legally required to withhold 24% of every payment and send it to the IRS as backup withholding.15Internal Revenue Service. Instructions for the Requester of Form W-9 (Rev. January 2026) You would eventually get that money credited when you file your return, but in the meantime it is cash you cannot use to run your business.
Insurance and Trade Licenses
General contractors almost universally require a Certificate of Insurance before letting a subcontractor on site. At minimum, expect to carry general liability coverage and workers’ compensation for your employees. Many master contracts set minimum limits, and project owners commonly require at least $1 million per occurrence for general liability. Your policy needs to be active before you start, and you will typically need to name the general contractor (and sometimes the project owner) as an additional insured.
Trade licensing varies by jurisdiction and specialty. Electrical, plumbing, and HVAC subcontractors almost always need a current trade license issued by the state or local licensing board. Application and renewal fees for specialty licenses typically run a few hundred dollars, but the real cost of working without one is losing your lien rights and potentially facing stop-work orders or fines.
Reading the Subcontract
The subcontract spells out the scope of work, project schedule, payment terms, indemnity obligations, and change-order procedures. Read it carefully, particularly any flow-down clauses. Those provisions automatically bind you to terms from the prime contract between the general contractor and the project owner. If the prime contract requires a specific safety program, a particular insurance endorsement, or a dispute resolution process, the flow-down clause makes those your obligations too, even if the subcontract does not spell them out individually. Always request a copy of the prime contract, or at least its relevant sections, before signing. Pay attention to whether flow-down language eliminates your right to file a lien for nonpayment, or binds you to arbitration in a location that would be impractical for you.
How Subcontractors Get Paid
Payment follows a predictable path, but each step has a potential choke point that can delay your money.
Invoicing
You submit a formal invoice after completing milestones defined in the subcontract, or at regular intervals for longer projects. Monthly progress billing is common. Most subcontracts specify net-30 or net-60 payment terms, meaning the general contractor has 30 or 60 days after receiving a conforming invoice to pay. That window exists so the general contractor can verify the work meets the required quality standards before releasing funds.
On federal construction projects the timeline is tighter. Under the Prompt Payment for Construction Contracts regulation, prime contractors must pay subcontractors within seven days of receiving payment from the government.16Acquisition.GOV. 52.232-27 Prompt Payment for Construction Contracts Many states have their own prompt payment statutes for public and sometimes private projects, typically requiring payment within 30 days of invoice approval.
Lien Waivers
Before or alongside receiving payment, you will usually be asked to sign a lien waiver. That document confirms you have been paid for specified work and surrenders your right to file a mechanic’s lien against the property for that amount. Mechanic’s liens are one of the strongest protections subcontractors have, because a lien attaches directly to the property and the owner cannot sell or refinance without clearing it. That leverage is exactly why general contractors and owners want your waiver in hand the moment they pay you.
Two distinctions matter. A conditional waiver takes effect only after your payment actually clears. An unconditional waiver takes effect immediately upon signing, whether or not the check has cleared. Never sign an unconditional waiver before the money is confirmed in your account. Deadlines for filing a mechanic’s lien if you do not get paid vary by state, but windows of 60 to 120 days after you last provided labor or materials are common.
Pay-When-Paid vs. Pay-If-Paid
These two clauses sound alike but allocate risk very differently. A pay-when-paid clause is a timing mechanism: the general contractor will pay you when they get paid by the owner, but they still owe you regardless. A pay-if-paid clause is far more aggressive. It makes the owner’s payment a condition of the general contractor’s obligation to pay you at all. If the owner goes bankrupt or simply refuses to pay, a pay-if-paid clause can leave you with no legal right to collect from the general contractor.
Many states refuse to enforce pay-if-paid clauses on public policy grounds, but the law varies enough that you cannot assume yours will be thrown out. The safer move is to negotiate for pay-when-paid language whenever possible, or at minimum ensure your contract preserves your right to file a mechanic’s lien even if the owner defaults.
Retainage
Retainage is a percentage of each progress payment that the general contractor holds back until the project is substantially complete. The standard range is 5% to 10% of each invoice. That might sound small, but on a $500,000 subcontract, 10% retainage means $50,000 of your money is tied up until the entire project wraps, which could be months or years after you finish your portion. State laws often cap retainage percentages and some require the percentage to drop once the project reaches a certain completion milestone. Make sure the subcontract does not impose retainage terms harsher than what the prime contract requires.
When Payments Stop
When payments stop, your instinct might be to walk off the job. Be careful. Stopping work without contractual authorization can be treated as a breach of contract, which means you lose your right to collect what you are already owed and potentially face a claim for the cost of replacing you. Many subcontracts contain language requiring you to keep working even during payment disputes. The fix is to negotiate a stop-work clause before you sign. A typical provision allows you to suspend work if payment has not arrived within a set number of days after you performed the work; 45 days is a common threshold. Without that clause, your safer options are filing a mechanic’s lien, invoking any applicable state prompt-payment statute, or pursuing the dispute through the contract’s resolution process.
Safety on Shared Job Sites
Construction sites with multiple subcontractors create overlapping safety responsibilities, and this is where subcontractors often get caught off guard. OSHA does not limit citations to the company whose employee got hurt. Under its multi-employer citation policy, OSHA can cite any employer on a shared worksite that created a hazard, exposed workers to a hazard, was responsible for correcting it, or had overall supervisory authority over the site.17OSHA. Multi-Employer Citation Policy (CPL 2-0.124)
As a subcontractor you will most often be classified as a creating or exposing employer. If you spot a hazard you cannot fix yourself, OSHA expects you to ask the controlling employer (usually the general contractor) to correct it, warn your own workers, and take whatever protective steps are within your authority. In extreme situations involving imminent danger, the expectation is that you pull your crew off the site entirely. Failing to do any of these things makes you citable, even though the hazard is not yours. Most general contractors require subcontractors to submit a site-specific safety plan and job hazard analyses before starting work, and to keep training records available on request.