Sales Tax Guide · Updated November 7, 2026

Contractor Sales Tax: Materials vs. Labor

Published November 7, 2026 · Reviewed by the USA Sales Tax Calculator editorial team.

Contractors sit in an awkward sales tax position. They buy materials, add labor, and deliver a finished improvement to real property. The state may see the contractor as the final consumer of the materials, as a retailer of the materials, or as a service provider whose labor is taxable or exempt. The classification determines whether the contractor pays tax at the supply house, charges tax to the customer, or does both.

Two basic models

In a "contractor as consumer" state, the contractor buys materials as the final consumer and pays sales tax at the point of purchase. The contractor then bills the customer for the improvement without separately charging sales tax on the materials. Labor is generally not taxable because the contractor is providing a real-property improvement service rather than selling tangible personal property. In a "contractor as retailer" state, the contractor may buy materials for resale using a resale certificate and then charge the customer sales tax on the materials, and sometimes on the labor as part of the transaction.

Real property versus tangible personal property

The key distinction is whether the contractor is improving real property or selling tangible personal property. Installing a new roof, replacing a water heater, or remodeling a kitchen is generally a real-property improvement. The contractor is providing a service, and the materials become part of the realty. Selling a freestanding appliance, a piece of furniture, or a portable generator is generally a retail sale of tangible personal property. The same business can do both, so the invoice must separate the real-property contract from the retail sale.

A "time and materials" contract does not automatically change the classification. The test is the nature of the work, not the billing method. A contractor that installs a built-in cabinet is improving real property even if the invoice lists the cabinet and the labor separately. A contractor that delivers a freestanding cabinet without installation is selling tangible personal property. The contract, the scope of work, and the way the item is attached to the property all matter.

State examples

California generally treats construction contractors as consumers of materials used in real-property improvements; the contractor pays tax at the supply house and does not charge sales tax on the improvement contract. Texashas a similar consumer model for most real-property contracts, with separate rules for new construction and for contractors who fabricate items.Florida generally treats contractors as consumers of materials incorporated into real property, but it taxes certain services and has specific rules for commercial rentals.New York treats contractors as consumers of materials in capital improvements but as retailers for repair and maintenance work in some circumstances.

Washington taxes contractors as consumers of materials and also taxes retail construction services to consumers, which can produce a tax on both the materials and the labor.Illinois generally treats contractors as consumers of materials used in real-property improvements.Pennsylvania taxes contractors as consumers of materials but generally does not tax labor on real-property construction. Massachusettshas detailed rules that distinguish capital improvements from repairs and maintenance.

Resale certificates for contractors

A contractor can use a resale certificate only when the state treats the contractor as a retailer of the materials. In a consumer state, using a resale certificate for materials incorporated into real property is usually improper, because the contractor is the final consumer. In a retailer state, the contractor may buy for resale and then charge tax on the retail sale. The certificate must match the state's model and the contractor's actual role in the transaction.

Labor and service taxability

Labor is not automatically exempt. Some states tax specified services, including certain repair, maintenance, and installation services, even when the contractor is not selling tangible personal property. A state may also tax the labor portion of a mixed contract while exempting the materials, or vice versa. The invoice should identify the service, the materials, and the tax treatment of each component. If the state taxes the service, the labor line is part of the taxable base; if the state treats the contract as a real-property improvement, the labor may be outside the sales tax base.

Subcontractors and documentation

A general contractor that hires a subcontractor should obtain a certificate or documentation showing how the subcontractor treats the materials. If the subcontractor is a consumer of materials, the subcontractor pays tax at purchase and the general contractor should not be charged sales tax again on the same materials. If the subcontractor is a retailer, the subcontractor may charge tax on its retail sale. Double taxation can occur when both parties assume the other is responsible. A written certificate and a clear scope of work prevent that outcome.

A contractor's checklist

1. Classify the project as real-property improvement or retail sale.
2. Confirm whether the state treats you as a consumer or a retailer.
3. Pay tax at purchase or collect a resale certificate, but not both.
4. Separate materials, labor, and taxable services on the invoice.
5. Keep subcontractor certificates and supplier invoices.
6. Review the rule when a project crosses a state line.

The resale certificate guide explains certificates in more detail, theuse tax guidecovers purchases where no tax was collected, and thelocal tax guideexplains why the job-site address can change the rate.

Change orders and mixed contracts

A change order can change the tax treatment of a project. If the original contract is a real-property improvement and the change order adds a freestanding appliance or a retail sale, the two components may need different treatment. The invoice should separate the original contract, the change order, and any retail items. A single lump-sum invoice can hide the distinction and create a tax exposure for the contractor.

Mixed contracts are common in remodeling and commercial work. A contract may include demolition, framing, electrical, plumbing, and a retail sale of fixtures. The contractor should determine which portions are real-property improvements and which are retail sales, then apply the state's rules to each portion. If the state treats the contractor as a consumer of materials, the contractor pays tax at purchase and does not charge tax on the improvement. If the state treats the contractor as a retailer for the fixtures, the contractor may need to collect tax on that portion.

Keep the permit documents, the scope of work, and the supplier invoices with the contract. The permit and scope help show that the work is a real-property improvement, while the supplier invoices show whether tax was paid at purchase. The resale certificate guide explains the documentation for the retail portion.