IRA Prevailing Wage Requirements for Solar Contractors: What You Need to Know in 2026

If your solar projects qualify for the federal Investment Tax Credit (ITC) or the Production Tax Credit (PTC), prevailing wage compliance is mandatory. It is the condition that determines whether your client claims 6% or 30% on their federal tax credit. That difference, on a $2 million project, is $480,000. On a $5 million project, it is $1.2 million.

The Inflation Reduction Act of 2022 tied the full value of clean energy tax credits to two labor requirements: paying prevailing wages and using registered apprentices. These requirements apply to solar contractors, their subcontractors, and, in some cases, their 1099 crews. Most solar companies know these rules exist. Fewer understand exactly what they require and what happens when they get it wrong.

This guide covers, in practical terms, the IRA prevailing wage requirements for solar contractors: who is covered, which rates apply, how to file, and what the apprenticeship rules actually require on the job site.

Why the IRA Prevailing Wage Rules Matter for Solar Contractors

Before the IRA, most solar projects were not subject to federal prevailing wage requirements unless they involved direct federal funding. That changed in 2022.

The IRA amended the Internal Revenue Code to add prevailing wage and registered apprenticeship (PWA) requirements to 10 of the law’s clean energy tax provisions. For solar contractors, the two most relevant are Section 48E (the Investment Tax Credit) and Section 45Y (the Production Tax Credit).

The credit structure works on a multiplier:

• Base credit: 6% of qualified project costs under Section 48E, or 0.3 cents per kilowatt-hour under Section 45Y
• Bonus credit with PWA compliance: 30% under Section 48E, or 1.5 cents per kilowatt-hour under Section 45Y

That is a 5x multiplier. The difference between meeting these requirements and failing to meet them is not marginal. It is the difference between a credit that makes a project viable and one that does not.

For projects above 1 megawatt (MW) that began construction after January 29, 2023, the PWA requirements apply by default. Small facilities with a capacity of less than 1 MW are exempt. Contractors working on larger commercial or utility-scale solar need to treat PWA compliance as a standard part of how they run a project.

What “Prevailing Wage” Means for Solar Projects

Prevailing wages are the hourly rates that the Department of Labor (DOL) establishes as the standard for each type of construction work in a given geographic area. They consist of two parts: a base hourly wage and a fringe benefit rate.

The IRA requires that all laborers and mechanics employed on the construction, alteration, or repair of a qualified solar facility be paid at least the applicable prevailing wage rates. This is similar to the Davis-Bacon Act, which applies to federally funded public works, but there are important differences.

The IRA prevailing wage definition of “employed” is broader than Davis-Bacon. Under the IRA rules, a worker is considered employed even if they would be classified as an independent contractor for tax purposes. If someone performs the duties of a laborer or mechanic on your IRA-covered solar project, they must be paid prevailing wage, regardless of how you have classified them for payroll taxes. This surprises many solar companies that rely on 1099 installation crews.

The IRA covers the taxpayer’s own employees, as well as contractors and subcontractors. Under the Davis-Bacon Act, the taxpayer’s own workers are generally excluded. Under IRA prevailing wage rules, they are included. If the project owner has their own workers on site, those workers must be paid the prevailing wage, too.

Rates are locked in at contract execution. The prevailing wage rates that apply to your project are determined at the time the prime contract is signed and are generally fixed for the life of that contract. If scope changes or new work is added, a new wage determination applies to the additional work. For open-ended contracts not tied to specific work, rates must be updated annually.

To find the applicable rates for your project, use the DOL’s wage determination database on http://SAM.gov . Search by state, county, and construction type. Solar installations typically pull rates for electrical work, general construction, and, in some cases, roofers or ironworkers, depending on the scope of work.

How to Pay Prevailing Wage Correctly

Prevailing wage rates include a base wage and a fringe benefit rate. You can satisfy the fringe component in one of two ways:

Option 1: Pay the full base wage plus make contributions to bona fide fringe benefit plans (health insurance, pension, vacation, apprenticeship training funds). The contributions must go to legitimate plans, not to the worker as extra cash in lieu of fringe.

Option 2: Pay the base wage plus an additional cash amount equivalent to the fringe benefit rate. This is called “cash in lieu of fringe” and is a compliant method, but the total hourly compensation must equal or exceed the full prevailing wage package.

If a worker performs duties that fall into multiple labor classifications on the same project, you must track time by classification and pay the applicable rate for each type of work performed. A worker who does both laborer and electrical work on the same day needs to have their time split and paid at the correct rate for each.

Certified Payroll Requirements for Solar Contractors

When your solar project is subject to IRA prevailing wage requirements, you must file certified payroll reports. The standard federal form is the WH-347, also called the Statement of Compliance.

The WH-347 must be completed weekly for each week in which work is performed on the project. It captures:

• Worker name, address, and Social Security number
• Work classification (electrician, laborer, ironworker, etc.)
• Hours worked each day and the total for the week
• Actual hourly rate paid and fringe benefit rate
• Statement of compliance signed by a company officer

Beyond filing the WH-347, the IRA requires that you maintain detailed payroll records for every worker on the project, including subcontractor and sub-tier subcontractor employees. These records must be made available to the IRS if the project is audited. The IRS can request unredacted payroll records, meaning you must hold the actual records, not just a summary.

A critical point: you cannot satisfy this recordkeeping obligation by including a clause in your subcontract that puts the responsibility on the subcontractor. The IRS Final Rule on IRA prevailing wage, published June 25, 2024, is explicit that taxpayers must collect and hold these records themselves. If a subcontractor fails to pay prevailing wage, the liability flows back to the project owner and, in practice, to the GC through contractual indemnification clauses.

The IRS introduced Form 7220 in late 2025 as the standardized attestation tool for claiming IRA credits with PWA compliance. This form requires granular data on every worker, every hour, and every wage paid across all contractors. If you cannot produce that data, your credit claim is at risk.

IRA Apprenticeship Requirements for Solar Projects

The apprenticeship component of IRA PWA has three separate requirements, all of which must be met.

1. Labor hours requirement: Registered apprentices must perform at least 15% of the total labor hours on the construction of the facility. This percentage applies across the full project, not per trade or per week. Projects that began construction in 2023 had a lower threshold of 12.5%. For any project starting construction in 2024 or later, the threshold is 15%.

2. Ratio requirement: Each contractor and subcontractor that employs apprentices must comply with the apprentice-to-journeyworker ratios established by their registered apprenticeship program or the applicable state apprenticeship agency. These ratios are typically set at 1 apprentice per journeyworker but vary by trade and state. The ratio must be maintained on a daily basis, not averaged over the project.

3. Participation requirement: Each contractor or subcontractor that has four or more workers on the project must employ at least one registered apprentice. This is a project-level headcount, not a company-level headcount. If your sub brings five workers to the site, they must have at least one registered apprentice in the crew.

Apprentices must be enrolled in a Registered Apprenticeship Program (RAP) that is approved by either the DOL Office of Apprenticeship or a state apprenticeship agency. Workers in informal training programs or pre-apprenticeship programs do not qualify.

The Good Faith Effort Exception applies when a contractor makes a written request to a registered apprenticeship program, and the request is denied or goes unanswered for five business days. If you invoke this exception, you must document the request and the response and keep that documentation in your project file. The exception only covers the specific hours for which the request was denied. You must keep requesting subsequent work periods.

The IRS and DOL expect documentation of apprenticeship compliance to be contemporaneous. Tracking apprentice ratios after the fact is not sufficient.

Penalties for Non-Compliance and How to Cure Violations

The IRA provides a cure provision for prevailing wage violations, which is useful to know because mistakes do happen on complex projects.

If you discover that prevailing wages were not paid correctly, you can cure the violation by:

• Paying each underpaid worker the difference between what they were paid and the correct prevailing wage rate
• Adding interest to the underpayment
• Paying a penalty of $5,000 per underpaid worker to the IRS

For intentional disregard of the requirements, the penalty increases to three times the underpayment amount plus $10,000 per underpaid worker. The distinction between an error and intentional disregard matters significantly, which is another reason to maintain thorough payroll records showing that you were making reasonable efforts to comply.

Apprenticeship violations have a separate cure provision with a $50 per-hour penalty for each hour that apprentices were not used as required.

What to Have in Place Before Construction Starts

The most important thing to understand about IRA prevailing wage compliance is that it begins at the start of construction, not when the project reaches a certain size or milestone.

Before your crew arrives on site, you need to:

1. Pull the applicable prevailing wage determination from http://SAM.gov  for your project’s county and work classifications.
2. Confirm that the wage determination is with the prime contract execution date to lock it in.
3. Configure your payroll system to track workers by classification and pay the correct base wage and fringe rates.
4. Post the prevailing wage notice at the job site.
5. Request apprentices from a registered apprenticeship program and confirm enrollment before work begins.
6. Set up daily tracking for apprentice-to-journeyworker ratios
7. Establish a process for collecting weekly WH-347 filings from every subcontractor on the project.

The contractors who run into problems are almost always the ones who started construction first and tried to establish compliance procedures afterward. The records the IRS asks for are generated during construction, not reconstructable from memory after the fact.

The Bottom Line

IRA prevailing wage requirements add real operational complexity to solar projects. They require a payroll system that tracks workers by classification, generates compliant, certified payroll reports, manages apprentice ratios, and collects documentation from subcontractors. That is not a one-time setup task. It runs for the life of every qualifying project.

The contractors who treat this as a standard operational process, rather than a compliance fire drill at project end, are the ones who protect their clients’ tax credits and keep their own records clean when the IRS comes looking.