A subcontract is a legally binding agreement in which a prime contractor hires another company or individual to perform a defined portion of a larger project the prime contractor has already agreed to deliver. The arrangement creates a chain: the project owner hires a prime contractor, and the prime contractor delegates specialized work to one or more subcontractors. You see subcontracts most often in construction, government procurement, IT development, and manufacturing, but any industry that layers specialized expertise uses them.
The Three Parties and How They Connect
Every subcontracting arrangement involves three roles. The project owner (sometimes called the client or awarding agency) pays for the finished product. The prime contractor signs the main contract with the owner and takes responsibility for delivering the entire project. The subcontractor signs a separate agreement with the prime contractor to handle one slice of the work: pouring foundations, writing code, fabricating components, and so on.
The subcontractor answers to the prime contractor, not to the project owner. Even though the subcontractor’s work ultimately benefits the owner, the two have no direct contractual relationship. On federal projects, the prime contractor is responsible for vetting every subcontractor’s qualifications, and the government can separately evaluate a subcontractor’s fitness when the stakes justify it.1Acquisition.GOV. FAR 9.104-4 Subcontractor Responsibility
When the Chain Goes Deeper
Large projects often extend past a single layer. A prime contractor hires a first-tier subcontractor, who hires a second-tier subcontractor (sometimes called a sub-subcontractor), and the chain can keep going. Each tier has a contract only with the party directly above it. A second-tier electrical subcontractor has no agreement with the prime contractor or the owner. On federal contracts, the prime contractor still bears overall responsibility and must ensure lower-tier subcontractors comply with required contract clauses.2U.S. Small Business Administration. Prime and Subcontracting
Why the Owner and Subcontractor Can’t Sue Each Other Directly
The legal principle behind this is privity of contract. Only the parties who signed the same agreement can enforce it. The owner signed with the prime contractor. The subcontractor signed with the prime contractor. Owner and subcontractor never signed anything together, so neither can directly sue the other for breach.
Two consequences follow. If the subcontractor’s work is defective, the owner’s recourse runs through the prime contractor, who then pursues the subcontractor. And if the owner stops paying, the subcontractor cannot chase the owner directly for the shortfall; the subcontractor’s claim is against the prime contractor. That gap is why payment bonds and lien rights matter so much — without them, a subcontractor can be left exposed when a prime contractor runs into trouble.
Core Terms Inside a Subcontract
A handful of provisions do most of the work in any subcontract. Vague drafting in any of them is where disputes start.
Scope of Work
The scope spells out exactly what the subcontractor is responsible for delivering: which tasks, which materials, which quality standards, and which portions of the project are explicitly outside the subcontractor’s responsibility. A well-drafted scope prevents the most common dispute, which is one side calling work “extra” while the other insists it was always included.
Payment Terms
Payment clauses define when and how the subcontractor gets paid. Two structures dominate construction and deserve attention:
- Pay-when-paid: The prime contractor must pay the subcontractor within a set number of days after receiving payment from the owner. This sets timing but does not eliminate the prime contractor’s obligation to pay. On federal construction contracts, the Prompt Payment Act sets that window at seven days.3Office of the Law Revision Counsel. 31 USC 3905 – Payment Provisions Relating to Construction Contracts
- Pay-if-paid: The subcontractor gets paid only if the owner actually pays the prime contractor. If the owner goes bankrupt or refuses to pay, the subcontractor absorbs the loss. A growing number of states either refuse to enforce these clauses or have banned them outright.
On federal construction projects, a prime contractor who misses the seven-day window owes interest to the subcontractor at the rate set by the Secretary of the Treasury. The same obligation cascades down between a first-tier subcontractor and a second-tier firm.3Office of the Law Revision Counsel. 31 USC 3905 – Payment Provisions Relating to Construction Contracts
Schedule and Liquidated Damages
The subcontract ties the subcontractor’s work to milestones that sync with the overall timeline. Missing a milestone can delay the whole project, so many subcontracts include liquidated damages: a pre-agreed daily charge the subcontractor owes for each day of delay. Courts enforce liquidated damages only when they reflect a reasonable estimate of actual harm, so the daily figure has to bear some relationship to real downstream cost rather than functioning as a penalty.
Retainage
Retainage is the portion of each progress payment the prime contractor withholds until the work is finished. It operates as a financial guarantee that the subcontractor will complete the job and correct any defects. On federal construction contracts, retainage can run up to 10 percent of approved amounts and must be released promptly once all contract requirements are met.4Acquisition.GOV. FAR 52.232-27 Prompt Payment for Construction Contracts Many states cap retainage at 5 percent on private projects. Either way, subcontractors need to budget for the cash-flow gap, because that money can sit tied up for months.
Flow-Down Provisions
A flow-down provision pushes obligations from the prime contract into the subcontract. If the owner requires certain safety standards, wage rules, or reporting procedures, the prime contractor uses flow-down language to make those same requirements binding on every subcontractor.
The practical result is that a subcontractor can be bound by terms in a document they never signed. A prime contract may require compliance with federal prevailing-wage rules under the Davis-Bacon Act, for example, and the flow-down clause makes that the subcontractor’s obligation as well.5U.S. Department of Labor. Fact Sheet 66C – The Davis-Bacon and Related Acts: Labor Standards Clauses and Subcontract Agreements The same can apply to dispute resolution, environmental protections, insurance requirements, and reporting.
Before signing, ask for a copy of the prime contract or at least the sections being flowed down. Broad language like “all terms and conditions of the prime contract shall apply” can bind you to obligations you have never read. Where possible, negotiate which specific clauses flow down and which don’t apply to your scope.
How Subcontractors Get Paid When Things Go Wrong
Because privity isolates the subcontractor from the project owner, several mechanisms exist to keep subcontractors from being left unpaid when something breaks higher up the chain.
Payment Bonds on Federal Projects
On federal construction contracts over $150,000, the Miller Act requires the prime contractor to post a payment bond equal to the full contract price.6Acquisition.GOV. FAR Subpart 28.1 – Bonds and Other Financial Protections The bond guarantees payment to every subcontractor and material supplier. If the prime contractor doesn’t pay, the subcontractor can file a claim directly against the bond.7Office of the Law Revision Counsel. 40 USC 3131 – Bonds of Contractors of Public Buildings or Works
Timing is strict. A first-tier subcontractor with a direct contract with the prime can file a bond claim without prior notice. A second-tier subcontractor must give written notice to the prime contractor within 90 days after the last day of work or materials supplied. Regardless of tier, any bond claim must be filed within one year of that last day.8Office of the Law Revision Counsel. 40 USC 3133 – Rights of Persons Furnishing Labor or Material Miss either deadline and the right to recover can be lost permanently.
For federal contracts between $35,000 and $150,000, the contracting officer selects alternative payment protections, which may include a payment bond or take another form.6Acquisition.GOV. FAR Subpart 28.1 – Bonds and Other Financial Protections
Mechanic’s Liens on Private Projects
On private construction projects, an unpaid subcontractor can file a mechanic’s lien against the property itself. The lien gives the subcontractor a legal claim on the real estate, which pressures the owner to resolve the payment dispute even though no direct contract exists between them.
Lien rights come with strict notice and filing deadlines that vary by state. Most states require a preliminary notice early in the project to preserve lien rights, and the actual lien has to be filed within a window that ranges from roughly 60 days to one year after the work ends. Missing the preliminary notice deadline can eliminate lien rights entirely, which makes it one of the most commonly forfeited protections in the industry.
Changes and Early Termination
Change Orders
Projects rarely unfold exactly as planned, and change orders are the formal way to adjust the subcontract when scope, schedule, or conditions shift. For subcontractors, documentation is everything. Work performed outside the original scope without a written change order is notoriously hard to get paid for. Most well-drafted subcontracts require written notice within a specified number of days of identifying extra or changed work, describing what changed, how it affects cost and schedule, and which contract items are involved.9Acquisition.GOV. FAR 52.243-7 Notification of Changes A subcontractor who simply does the extra work and invoices later usually loses that fight.
Termination for Cause vs. Convenience
Subcontracts can end before the work is done, and the reason determines what the subcontractor can recover. A termination for cause (also called termination for default) happens when the subcontractor fails to perform. The subcontractor may owe damages and forfeits the right to payment for incomplete work.
A termination for convenience lets the prime contractor end the subcontract for business reasons unrelated to performance. The subcontractor can typically recover costs for completed work, reasonable wind-down expenses, and settlement costs, but generally not anticipated profit on the work never performed. The financial gap between the two outcomes can be substantial.
Insurance and Indemnification
Subcontracts routinely require the subcontractor to carry specific types and minimum amounts of insurance before starting work. Common requirements include commercial general liability, business automobile liability, and workers’ compensation at statutory limits. Minimums vary, but general liability policies of $1 million per occurrence and $2 million in aggregate are a common baseline for commercial projects.
Beyond insurance, subcontracts frequently include indemnification clauses requiring the subcontractor to cover the prime contractor’s losses caused by the subcontractor’s negligence. A limited indemnification clause only covers losses caused by the subcontractor’s own fault. A broader version can require the subcontractor to cover losses even when the prime contractor was partially at fault. Several states prohibit or limit broad-form indemnification in construction contracts, so enforceability depends on jurisdiction.
Watch also for waiver-of-subrogation clauses, which prevent the subcontractor’s insurer from suing other project parties to recoup a paid claim. The waiver keeps losses with the insurance that covers them instead of pulling every party into litigation.
Subcontractor or Employee?
Whether a worker is actually a subcontractor or an employee in a subcontractor’s clothing is a question the IRS takes seriously, and getting it wrong creates real financial exposure. The IRS uses common-law rules, and the central question is control: if the hiring party controls not just what work gets done but how it gets done, the worker is likely an employee, regardless of what the contract calls them.10Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
A legitimate subcontractor generally operates as an independent business, serves multiple clients, controls their own methods and schedule, and provides their own tools. Someone who works exclusively for one company, follows that company’s procedures, and uses its equipment starts to look much more like an employee. Either the worker or the hiring firm can file IRS Form SS-8 to request an official determination when the classification is unclear.11Internal Revenue Service. Instructions for Form SS-8
Starting with the 2026 tax year, any business paying a subcontractor $2,000 or more during the year must report those payments on Form 1099-NEC. The threshold increased from $600, so businesses used to the old rule need to update their accounting.12Internal Revenue Service. Publication 1099 General Instructions for Certain Information Returns (2026) Misclassifying an employee as a subcontractor can trigger back taxes, penalties, and liability for unpaid employment taxes, benefits, and workers’ compensation premiums, with consequences escalating if the IRS concludes the misclassification was intentional.