To start a subcontractor business, you pick a legal structure, register the entity with your state and get a federal tax ID, secure the trade license and insurance your work requires, and set up a tax and bookkeeping system built around quarterly estimated payments. Learning how to start a subcontractor business is mostly about doing those steps in the right order. Skip one, or run them out of sequence, and you can lose contracts, forfeit your liability shield, or walk into penalties you never saw on the horizon. State rules vary, so treat the specific fees and deadlines below as starting points and confirm them with your own state’s agencies.
Pick a Legal Structure
Your structure decides how much personal risk you carry and how the IRS taxes you. Three options cover almost every subcontractor.
A sole proprietorship needs no formation paperwork, but your home, savings, and vehicles are exposed to every business debt and lawsuit. If a project goes sideways, creditors can reach everything you own.
A limited liability company puts a legal wall between business obligations and personal assets. It’s the most popular choice for small subcontractors because it pairs liability protection with simple tax filing. A single-member LLC is taxed like a sole proprietorship by default, so you get the shield without extra tax complexity.
A corporation offers the strongest liability shield and more tax planning options, but comes with formal recordkeeping and, for C corporations, potential double taxation. Some large government contracts require corporate form.
The protection an LLC or corporation offers only holds up if you keep business and personal finances strictly separate. Paying personal bills from the business account gives a court reason to “pierce the veil” and treat business debts as your own. That separation starts with your formation documents and runs through every financial decision you make afterward.
Register the Business
Once you’ve chosen a structure, make it official with your state and the IRS.
State Formation Documents
LLCs file Articles of Organization; corporations file Articles of Incorporation. Both go to the Secretary of State. Most states accept online filings, though mail is still an option. Filing fees run roughly $35 to $500, and processing times range from same-day electronic filings to several weeks for paper. When the state approves, you receive a certificate confirming the entity legally exists.
If you plan to operate under a name different from your legal name or your entity’s official name, file a “Doing Business As” (DBA). Without one on record, you may not be able to open a business bank account or enforce contracts under that trade name.
Registered Agent
Every LLC and corporation must designate a registered agent to accept lawsuits and government notices. The agent needs a physical street address in the state of formation and must be available during business hours. You can serve as your own agent, but subcontractors on job sites all day often hire a commercial service so nothing gets missed.
Employer Identification Number
An Employer Identification Number (EIN) is your business’s federal tax ID. Apply on IRS Form SS-4, which asks for the entity’s legal name, business structure, the responsible party’s name and Social Security number, expected number of employees, and when wages will first be paid.1Internal Revenue Service. Instructions for Form SS-4 (Rev. December 2025) Applying online through the IRS is free and issues the EIN immediately, so you can open bank accounts, apply for licenses, and file returns right away.2Internal Revenue Service. Employer Identification Number Keep the confirmation notice; prime contractors and bonding companies will ask for it.
What You Can Skip: BOI Reporting
Older guides tell you to file a Beneficial Ownership Information report with FinCEN under the Corporate Transparency Act. Under a March 2025 interim final rule, domestic entities formed in the United States are exempt.3Financial Crimes Enforcement Network. Beneficial Ownership Information Reporting Skip this step.
Get Licensed and Insured
Trade Licenses
Most states require subcontractors in skilled trades, including plumbing, electrical, HVAC, and roofing, to hold a state-issued license before performing any work. Licensing boards typically require several years of supervised experience (often four to five years for journeyman credentials) plus a passing score on a technical exam covering codes and safety. Exam fees commonly range from $100 to $500, and renewals run from about $30 to $300 depending on trade and state. Continuing education is usually part of keeping the license active.
Working without the required license is one of the fastest ways to destroy a subcontracting business. Penalties can include civil fines in the thousands, misdemeanor charges, and contracts that are unenforceable in court. If you can’t sue to collect payment because you weren’t licensed, the fine is the least of your problems.
Insurance
No established general contractor will hire you without proof of insurance, and required coverages are usually spelled out in the contract.
- Commercial general liability (CGL) covers third-party bodily injury and property damage. Most contracts require at least $1,000,000 per occurrence. This is effectively non-negotiable on commercial and government work.
- Workers’ compensation is required in nearly every state once you hire employees. It covers medical costs and part of lost wages for on-the-job injuries. Even solo operators are often required to carry it by state law or the general contractor, and if your uninsured subs get hurt, you can be on the hook for their benefits.
- Professional liability covers financial losses caused by mistakes in technical advice or design work. It matters most for engineering-adjacent trades, but contracts increasingly ask for it from specialized subs.
General contractors routinely require you to name them as an “additional insured” on your CGL policy so your coverage extends to claims arising from your work on their project. Your insurer issues a Certificate of Insurance documenting the arrangement, and you’ll produce an updated certificate for every new project. Get comfortable with this; you’ll do it constantly.
Surety Bonds
Public works projects and larger commercial jobs often require surety bonds as a financial guarantee that the work will be completed and suppliers will be paid. Performance bonds guarantee completion; payment bonds guarantee you’ll pay your suppliers and workers. Premiums for well-qualified contractors typically range from 1% to 3% of the contract value. Bonding companies review your financials, credit, and track record before issuing a bond, so building credit and keeping clean books from day one pays off.
If you’re too new to qualify, the Small Business Administration’s Surety Bond Guarantee program backs up to 90% of a surety’s losses on contracts up to $9 million, which helps small subcontractors get bonded.4U.S. Small Business Administration. Become an SBA Surety Partner
Set Up Taxes Before Your First Paycheck
Taxes are where new subcontractors get blindsided. No one withholds anything from your checks, so you owe both income tax and payroll tax yourself, on a quarterly schedule, or you pay penalties.
Self-Employment Tax
On top of federal income tax, you owe self-employment tax on your net earnings. That’s 12.4% for Social Security and 2.9% for Medicare, for a combined 15.3%.5Internal Revenue Service. Topic No. 554, Self-Employment Tax It’s double what employees pay because you cover both the employer and employee shares. The Social Security portion applies to net earnings up to $184,500 in 2026; the Medicare portion has no cap.6Social Security Administration. Contribution and Benefit Base You do get to deduct half of the self-employment tax from your adjusted gross income, which softens the blow slightly.
If your net self-employment earnings are $400 or more in a year, you file Schedule SE with your return. Sole proprietors and single-member LLCs report business income and expenses on Schedule C (Form 1040).7Internal Revenue Service. Schedule C and Schedule SE
Quarterly Estimated Payments
The IRS expects you to pay as you earn. For 2026, the deadlines are April 15, June 15, September 15, and January 15, 2027.8Taxpayer Advocate Service. Making Estimated Tax Payments These payments cover both income tax and self-employment tax.
Missing a deadline triggers an underpayment penalty calculated at the IRS’s quarterly interest rate. You avoid the penalty if your total tax owed is under $1,000, or if you’ve paid at least 90% of the current year’s tax or 100% of the prior year’s tax (110% if your AGI exceeded $150,000).9Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty The safest first-year approach is to set aside 25% to 30% of every payment you receive and make quarterly deposits.
The Qualified Business Income Deduction
Subcontractors operating as sole proprietors, LLCs, partnerships, or S corporations can deduct up to 20% of qualified business income under Section 199A.10Internal Revenue Service. Qualified Business Income Deduction The deduction was originally set to expire after 2025, but the 2025 One Big Beautiful Bill Act made it permanent. Higher earners face caps tied to W-2 wages the business pays or the value of its qualified property. Most small subcontractors sit below those thresholds and take the full 20%.
W-9s, 1099s, and Recordkeeping
Every general contractor who hires you should ask for a Form W-9 with your taxpayer identification number so they can report what they paid you.11Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification If they pay you $600 or more in a year, they send you and the IRS a Form 1099-NEC by January 31.12Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC (04/2025) If you hire subs of your own, you have the same reporting obligation.13Internal Revenue Service. Forms and Associated Taxes for Independent Contractors
Keep records of every income deposit and every deductible expense: tools, materials, vehicle mileage, insurance premiums, license fees, and home office costs. A dedicated business bank account is essential, both for cleaner books and to preserve your liability protection. Commingling funds jeopardizes the shield an LLC or corporation gives you.
Actually Operate as an Independent Contractor
Your business model depends on being classified as an independent contractor rather than an employee. The Department of Labor applies an “economic reality” test under the Fair Labor Standards Act, and the working relationship on the ground matters more than what the contract says.14Federal Register. Employee or Independent Contractor Status Under the Fair Labor Standards Act, Family and Medical Leave Act, and Migrant and Seasonal Agricultural Worker Protection Act
Two factors carry the most weight. First, control over the work: independent contractors set their own schedules, choose their own methods, and can work for multiple clients. If a GC dictates your hours, supervises your methods, and prevents you from taking other jobs, that looks like employment. Second, opportunity for profit or loss: genuine subcontractors invest in their own equipment, bid on jobs, manage costs, and can lose money on a project. Hourly pay with no financial risk points toward employee status.
Additional factors include whether the work requires specialized skills the hiring party doesn’t provide, whether the relationship is project-based or indefinite, and whether your work is integrated into the general contractor’s core production. Misclassification hits both parties with back taxes and penalties. Design the business to genuinely operate as an independent enterprise: maintain multiple clients, invest in your own tools, carry your own insurance, and control how the work gets done.
Protect Your Payments
Contract Documents
Professional subcontracting runs on written agreements. A Master Service Agreement (MSA) sets the broad terms between you and a general contractor: payment schedules, insurance requirements, indemnification, and dispute resolution. Each project is then governed by a Statement of Work (SOW) covering deliverables, timelines, and pricing.
Read every indemnification clause before signing. An “indemnify and hold harmless” provision means you cover the general contractor’s losses arising from your work, including their legal defense costs. Some contracts contain broad-form indemnification language that makes you responsible even for losses caused partly by the general contractor’s own negligence. Some states prohibit or limit these clauses; others don’t, and in those states the bill can be enormous.
Pay-When-Paid and Pay-If-Paid
Almost every subcontract ties your payment to the owner’s payment to the general contractor. The version matters. A “pay-when-paid” clause is generally read as a timing mechanism: the GC owes you, but not until they’ve been paid. A “pay-if-paid” clause shifts the entire risk of owner default onto you; if the owner never pays the GC, the GC argues they never have to pay you either. Courts and legislatures increasingly disfavor pay-if-paid clauses, and some states have banned them outright, but they still show up. Know which version you’re signing.
Mechanics Liens and Waivers
When a payment dispute erupts, your strongest tool is the mechanics lien, a legal claim against the property where you worked. Filing one gives you a secured interest that can force payment or block a sale or refinance until you’re paid. Many states require you to send a preliminary notice to the property owner within a set window, commonly 20 to 60 days from when you first provide labor or materials, to preserve lien rights. Miss that deadline and you can forfeit the ability to lien at all.
General contractors and owners will also ask you to sign lien waivers as you receive payments. A conditional waiver only takes effect once your payment actually clears; this is the safe version. An unconditional waiver takes effect immediately upon signing, whether the check bounces or not. Never sign an unconditional waiver before the money is in your account. This is where many subcontractors give away their leverage without realizing it.
Meet Safety Rules on the Job
Construction subcontractors are covered by OSHA regardless of business size. Once you have 10 or more employees, you must keep formal records of workplace injuries and illnesses under 29 CFR Part 1904.15Occupational Safety and Health Administration. Recording Covered employers also submit OSHA Form 300A electronically by March 2 each year for the prior calendar year.16Occupational Safety and Health Administration. Injury Tracking Application (ITA) Information
OSHA’s 10-hour and 30-hour outreach training courses are well known in construction but are voluntary at the federal level.17Occupational Safety and Health Administration. Training Requirements in OSHA Standards Some states and cities require outreach training on certain projects, and many general contractors require it regardless. A 10-hour course is a low-cost way to make yourself more marketable and to avoid being turned away from job sites.
Keep the Business in Good Standing
Launching is the easy part. Staying legally active takes attention to a few recurring obligations that are easy to forget until they cause problems.
Most states require LLCs and corporations to file an annual or biennial report with the Secretary of State, usually with a fee. The report itself is simple: confirm your address, registered agent, and principal members. Ignoring it isn’t. States handle delinquencies differently, from late fees to revoked good standing to administrative dissolution after two or three consecutive missed years. Administrative dissolution doesn’t erase your debts; it strips your liability protection and your legal authority to do business.
Trade licenses renew on a one-to-three-year cycle, usually with continuing education attached. Put every renewal deadline on your calendar the day the license issues. Even a brief lapse can knock you off active projects and complicate future renewals.
Local business permits from your city or county also renew annually. The fees are typically minor; the real risk is operating without one and finding out during a dispute or audit that yours has lapsed. A quarterly check of your state’s business portal, confirming entity, trade licenses, and local permits all read active, keeps small oversights from turning into contract-losing ones.