Material Suppliers Certified Payroll Requirements

Last Updated: October 2026

Are material suppliers subject to Davis-Bacon? In most cases, no. A company that manufactures or sells materials and delivers them to federal or federally assisted job site generally qualifies for the Davis-Bacon material supplier exemption, and its employees stay off certified payroll. 

That changes when the supplier's crew starts installing or building at the work site. Those hours are covered and must be paid at the prevailing wage and reported. 

For prime contractors and their payroll teams, the line between supplier and subcontractor decides who owes prevailing wages, who files a WH-374, and who is exposed in a compliance review. 

Table of Contents

• What Material Suppliers Certified Payroll Requirements Mean for Your Project
• The Davis-Bacon Material Supplier Exemption 
• Material Supplier vs. Subcontractor on Davis-Bacon Projects
• Davis-Bacon Off-Site Fabrication and On-Site Installation 
• How to Determine When Certified Payroll Applies 
• Common Mistakes When Classifying Material Suppliers 
• Frequently Asked Questions

What Material Suppliers Certified Payroll Requirements Mean for Your Project

Davis-Bacon requires contractors and subcontractors on covered contracts over $2,000 to pay laborers and mechanics prevailing wages for work performed on-site, and to submit weekly certified payroll to verify payment. A material supplier isn't performing construction work, so supply-only activity carries no prevailing wage or reporting obligation. Suppliers are one of several groups that falls outside Davis-Bacon coverage. 

The prime contractor is still responsible for compliance at every tier. If a vendor labeled as a supplier is installing on-site, the missing reports and any underpaid wages become the prime's problem, and the agency can withhold contract payments to cover back wages. 

Where the Current Rules Stand

The Department of Labor's 2023 rule, effective October 23, 2023, tightened coverage for suppliers and truck drivers. After contractors challenged it, a federal court in Texas vacated three provisions nationwide on June 24, 2026: 

• The provision pulling supplier operations run by contractors or subcontractors into coverage
• The expanded coverage for delivery drivers
• The provision applying Davis-Bacon by operation of law to contracts missing the required clauses. 

The rule's updated site-of-the-work definition was not part of that judgment.

The Davis-Bacon Material Supplier Exemption

A bona fide material supplier generally keeps the exemption when:

• Its work is limited to supply. Employees pick up and deliver materials and handle incidental tasks like drop-off and waiting time, but don’t install or build on-site.
• Its facility wasn’t set up for the project. The plant existed before the bid opening or, if opened later, isn’t dedicated exclusively, or nearly so, to the covered contract.
• Its facility isn’t part of the jobsite. Manufacturing doesn’t happen on the primary or a secondary construction site.

Selling to the general public is a strong signal. A plant serving many customers looks like a supplier; a plant stood up for one project looks like part of the construction. Since the June 2026 judgment, a company isn’t disqualified simply because it’s also a contractor or subcontractor on the project. What matters is the work each employee performs and where.

Material Supplier vs Subcontractor on Davis-Bacon Projects

This is dependent on what employees do and where they do it, not what a company calls itself or what the purchase order says. 

One company can be both. A steel fabricator shipping joists from its plant is a supplier; when it sends a crew to set those joists, that crew is covered. A "furnish and install" contract line is the clearest sign a vendor takes on subcontractor prevailing wage obligations for part of its scope.

Only the covered hours belong on the report, so those hours have to be tracked separately from supply time. WageIQ stores the applicable rates for each classification and surfaces prevailing wage calculations before payroll runs, so install hours are paid correctly and supply hours are excluded from the report.

Tracking supply and installation hours for the same vendor? See How WageIQ Works

Davis-Bacon Off-Site Fabrication and On-Site Installation

Fabricating prefabricated parts like precast, trusses, or ductwork at a permanent, established shop generally doesn’t make that shop part of the site of the work.

The Davis-Bacon site of the work extends beyond the primary job site. A location becomes a secondary construction site when a significant portion of the work, such as entire modules, is built there and the site was established for the contract or dedicated exclusively, or nearly so, to it for weeks, months, or more. Dedicated batch plants, borrow pits, and tool yards adjacent to the work can also count. Modules built at a temporary yard for one project would likely be covered; the same modules from a long-standing plant generally would not.

Once materials arrive, any installation or assembly at the site of the work is covered, no matter who employs the worker.

What About Delivery Drivers?

Drivers delivering for a bona fide supplier are generally not covered for delivery, drop-off, and waiting time. Drivers employed by a contractor who haul between the site and a dedicated facility, or who spread or place material on site, are covered for that time. The 2023 rule’s case-by-case test for drivers’ on-site time was vacated in June 2026, so the earlier approach applies again.

How to Determine When Certified Payroll Applies

Run through these questions during project setup, before the first payroll:

1. What does the contract say? "Furnish only" points to supplier status; "furnish and install" means part of the work is covered.
2. Where does the work happen? Primary site, secondary site, dedicated facility, or an established plant?
3. When and for whom was the facility set up? Before bid opening, serving the public, or dedicated to this project?
4. What do employees do on site? Delivery and waiting point to supplier status. Installing or assembling is covered.
5. Does state law apply? Some states go further. California, for example, extends prevailing wage to ready-mixed concrete delivery on public works, so material suppliers may be subject to prevailing wage even when Davis-Bacon doesn’t apply.
6. Is the decision documented? Keep a written determination in the project file, and flow the required clauses down to any vendor performing covered work.

Once covered scopes are identified, those hours need to land on an accurate WH-347 every week. With Managed Services, our team partners with you to generate certified payroll reports and manage submissions, while your team supplies project and payroll inputs and reviews each report.

Want a partner on certified payroll reporting? Explore Managed Services. 

Common Mistakes When Classifying Material Suppliers

• Trusting the label. A self-described supplier can still perform covered work.
• Treating mixed scopes as all-or-nothing. Supply hours are exempt; installation hours are covered.
• Missing install crews. Vendors never listed as subcontractors are the most likely to be left off certified payroll.

Frequently Asked Questions About Material Suppliers Certified Payroll Requirements

Material suppliers are generally exempt from Davis-Bacon, but only for supply work. Once a vendor installs or builds at the site of the work, or fabricates at a site dedicated to the project, those hours require prevailing wages and certified payroll. The June 2026 ruling makes now a good time to review how your team classifies vendors.

Points North gives you two ways to keep Davis-Bacon certified payroll on track: manage rates and reports in-house with WageIQ, or partner with our Managed Services team