This article provides a general overview for informational purposes. Specific tax-credit eligibility and compliance requirements should be evaluated based on the facts of each project and applicable IRS, Treasury, and Department of Labor guidance.
- PWA compliance can significantly increase federal clean energy incentives. For many investment credits, meeting the requirements can increase the credit from 6% to 30% of eligible project costs.
- The taxpayer claiming the credit is ultimately responsible for compliance, even when contractors and subcontractors perform the work.
- Prevailing wage requirements apply to covered laborers and mechanics during qualifying construction, alteration, and repair work.
- Apprenticeship compliance generally involves three tests: labor hours, apprentice-to-journeyworker ratios, and employer participation.
- Good Faith Effort documentation can provide relief when a project properly requests apprentices but cannot obtain them.
- Prevailing wage obligations may continue after a project is placed in service, particularly for covered alteration and repair work.
- Recordkeeping is essential. Projects should maintain payroll, wage determination, worker classification, apprenticeship, ratio, and correction records.
- Form 7220 may be required when claiming increased credit or deduction amounts based on PWA compliance.
- PWA should be managed throughout construction, not reconstructed after the project is complete.
- Early compliance planning can protect a substantial portion of the project’s tax benefits and reduce the risk of penalties, credit loss, or recapture.
Federal clean energy incentives can provide significant financial benefits for renewable energy, energy storage, energy efficiency, manufacturing, and other energy projects. For many of these incentives, however, the amount available depends heavily on compliance with federal Prevailing Wage and Apprenticeship requirements, commonly referred to as PWA Requirements.
For many investment-based credits, satisfying PWA requirements can increase the credit 5X from 6% to 30% of eligible project costs. Similar 5X increases apply to several production credits and deductions.
These requirements were established through the Inflation Reduction Act of 2022 and clarified through final Treasury Regulations issued in June 2024. Subsequent legislation, including the One Big Beautiful Bill Act (OBBBA), changed the availability and timing of several clean energy incentives but generally did not eliminate the underlying PWA framework.
For taxpayers, developers, contractors, and project owners, PWA compliance should therefore be considered early in project planning rather than addressed only when the tax credit is filed.
Clean Energy Incentives Subject to PWA Requirements
The incentives most encountered in commercial clean energy projects are summarized below. In most cases, meeting PWA requirements increases the base incentive by approximately five times. Limited exceptions may allow certain projects to receive the increased amount without satisfying PWA, as discussed later in this article.
| Technology / Program | Section | Current Status | PWA Requirement | Multiplier | Base Incentive | Increased Incentive |
|---|---|---|---|---|---|---|
| Solar | 48E / 45Y | Active, subject to OBBBA wind/solar timing requirements | Prevailing Wage + Apprenticeship | 5× | 48E: 6%; 45Y: 0.3¢/kWh | 48E: 30%; 45Y: 1.5¢/kWh, before inflation adjustment |
| Wind | 48E / 45Y | Active, subject to OBBBA wind/solar timing requirements | Prevailing Wage + Apprenticeship | 5× | 48E: 6%; 45Y: 0.3¢/kWh | 48E: 30%; 45Y: 1.5¢/kWh, before inflation adjustment |
| Geothermal Heat Pumps | 48 | Active | Prevailing Wage + Apprenticeship | 5× | 6% | 30% |
| Geothermal Electricity Generation | 48E / 45Y | Active | Prevailing Wage + Apprenticeship | 5× | 48E: 6%; 45Y: base production credit | 48E: 30%; 45Y: 5× base production credit |
| Battery Energy Storage | 48E | Active | Prevailing Wage + Apprenticeship | 5× | 6% | 30% |
| Thermal Energy Storage | 48E | Active | Prevailing Wage + Apprenticeship | 5× | 6% | 30% |
| Energy Efficient Commercial Buildings | 179D | Available only if construction began by June 30, 2026 | Prevailing Wage + Apprenticeship | Approx. 5× | 2026: $0.59–$1.19/sf | 2026: $2.97–$5.94/sf |
| Carbon Oxide Sequestration | 45Q | Active | Prevailing Wage + Apprenticeship | 5× | $17/metric ton for certain captured carbon and $36/metric ton for direct air capture | $85/metric ton for certain captured carbon and $180/metric ton for certain direct air capture |
| Clean Hydrogen | 45V | Active, subject to applicable construction deadline | Prevailing Wage + Apprenticeship | 5× | Up to $0.60/kg statutory base depending on lifecycle emissions | Up to $3.00/kg, before inflation adjustment |
| Clean Fuel Production | 45Z | Active through 2029 | Prevailing Wage + Apprenticeship | 5× | Generally $0.20/gal or $0.35/gal for SAF, multiplied by the applicable emissions factor | Generally $1.00/gal or $1.75/gal for SAF, multiplied by the applicable emissions factor |
| Fuel Cells | 48E | Active | Prevailing Wage + Apprenticeship | 5× | 6% | 30% |
| Advanced Energy Projects | 48C | Active for projects receiving existing allocations | Prevailing Wage + Apprenticeship | 5× | 6% | 30% |
| Existing Nuclear Generation | 45U | Active | Prevailing Wage only | 5× | Base production credit | Increased production credit; no apprenticeship requirement |
| Alternative Fuel / EV Charging Infrastructure | 30C | No credit for property placed in service after June 30, 2026 | Prevailing Wage + Apprenticeship | 5× | 6% for depreciable property | 30%, subject to statutory caps |
OBBBA Key Impacts
- Energy Efficiency: OBBBA terminated Section 179D for property whose construction begins after June 30, 2026.
- Solar and Wind: OBBBA also created accelerated termination rules for applicable solar and wind facilities under Sections 45Y and 48E. Solar and wind facilities beginning construction after July 4, 2026 generally must be placed in service by December 31, 2027 to qualify.
Exceptions to PWA Requirements
PWA should not be treated as a universal requirement for every project receiving an increased credit.
Certain credits provide exceptions, most notably for:
- Qualifying facilities that began construction before January 29, 2023; and
- Certain qualified facilities with a maximum net output of less than one megawatt.
The one-megawatt exception does not apply uniformly to every incentive. For example, there is no corresponding one-megawatt exemption for Section 179D. Project owners should therefore evaluate the specific credit rather than assuming that every project under 1 mW is exempt from PWA.
Prevailing Wage Requirements
A taxpayer claiming an increased credit or deduction must ensure that laborers and mechanics employed by the taxpayer, contractors, and subcontractors are paid wages at rates not less than the applicable prevailing wage during covered construction, alteration, and repair work.
The taxpayer claiming the credit retains ultimate responsibility for compliance even where contractors and subcontractors employ the workers performing the construction.
Determining the Applicable Wage Rate
Prevailing wage determinations are issued by the U.S. Department of Labor and published through https://sam.gov/
The appropriate wage determination depends on factors including:
- Geographic location;
- Type of construction;
- Worker classification; and
- Timing of the applicable construction contract.
Worker classifications should reflect the work being performed rather than simply an employee’s internal job title.
The applicable wage generally consists of both a basic hourly wage and a required fringe benefit amount. Employers may satisfy the fringe portion through eligible bona fide benefits, cash payments, or a combination of the two.
Who Is a Laborer or Mechanic?
As defined in 29 CFR 5.2 the term laborer or mechanic “includes at least those workers whose duties are manual or physical in nature (including those workers who use tools or who are performing the work of a trade), as distinguished from mental or managerial. The term “laborer” or “mechanic” includes apprentices, helpers, and, in the case of contracts subject to the Contract Work Hours and Safety Standards Act, watchpersons or guards. The term does not apply to workers whose duties are primarily administrative, executive, or clerical, rather than manual.”
Importantly, simply classifying an individual as an independent contractor for payroll or employment-tax purposes does not necessarily remove that individual’s work from PWA. Coverage depends on the nature of the work and the PWA definitions. This issue can also arise with temporary staffing companies and other supplemental labor arrangements. Projects should evaluate the actual work being performed rather than relying exclusively on contractual worker classifications.
Routine Maintenance vs. Alteration or Repair
Prevailing wage requirements can extend beyond original construction for several credits. However, the rules generally distinguish alteration and repair from routine maintenance.
Routine maintenance intended to keep a facility operating—such as recurring inspections, cleaning, calibration, and replacement of limited-life items such as filters—generally does not constitute alteration or repair.
Whether more substantial work constitutes repair or alteration depends on the facts and circumstances.
This distinction becomes particularly important for owners of solar, storage, geothermal, and other facilities that have continuing prevailing-wage obligations after the project is placed in service.
How Long Does Prevailing Wage Apply?
The post-construction prevailing-wage period varies by incentive.
| Credit / Deduction | Post-Construction Prevailing Wage Period |
|---|---|
| 48 / 48E | 5 years beginning on the placed-in-service date |
| 45 / 45Y / 45V | Generally 10-year credit period |
| 45Q | 12 years after placed in service |
| 45Z | Applies during the applicable credit period under its specific rules |
| 30C / 45L / 48C / 179D | No separate post-PIS alteration/repair PW requirement |
| 45U | Prevailing wage applies to covered alteration and repair; original construction is not subject to the 45U PW requirement |
For Sections 48 and 48E, failure to satisfy prevailing wage requirements during covered alteration or repair work within the five-year period can also create recapture implications for the increased credit.
Key Insight: PWA compliance cannot always end when the EPC contractor leaves the project. Owners should establish procedures for identifying covered repair and alteration work during the applicable compliance period.
Correcting Prevailing Wage Failures
The regulations provide a mechanism to preserve the increased credit when underpayment is discovered.
Generally, the taxpayer must:
- Make a correction payment to the affected worker; and
- Pay an applicable penalty to the IRS.
Correction Payment
The worker must generally receive:
- The difference between the wages actually paid and the required prevailing wage; plus
- Interest calculated using the applicable Section 6621 underpayment methodology, modified by substituting six percentage points for three percentage points in the applicable rate calculation.
IRS Penalty
The standard prevailing-wage penalty is generally:
$5,000 × each laborer or mechanic who was underpaid during the applicable period.
If the IRS determines that the failure resulted from intentional disregard, the correction payment can increase to three times the wage shortfall and the IRS penalty can increase to $10,000 per affected laborer or mechanic.
Regular compliance review, prompt corrections, contractual PWA provisions, worker notification, and appropriate recordkeeping are among the facts considered when evaluating intentional disregard.
IRS Penalty Waiver
The $5,000 penalty can be waived for certain relatively small and promptly corrected failures.
Generally, the correction must be made no later than the last day of the first month following the calendar quarter in which the failure occurred, and either:
- The failure occurred in fewer than 10% of the worker’s pay periods during the applicable calendar year; or
- Total underpayments were not more than 5% below the required prevailing wage amount.
The regulations also contain relief associated with qualifying Project Labor Agreements.
Apprenticeship Requirements
For most PWA-covered incentives, satisfying apprenticeship requirements requires compliance with three separate tests:
- Participation Requirement
- Labor Hours Requirement
- Ratio Requirement
Participation Requirement
The Participation Requirement applies at the contractor level.
Each taxpayer, contractor, or subcontractor that employs four or more individuals performing covered construction, alteration, or repair must employ at least one qualified apprentice.
Key Insight: A project cannot satisfy the Participation Requirement simply because apprentices are present elsewhere on the overall project. Each contractor and subcontractor reaching the applicable worker threshold must evaluate its own requirement.
Labor Hours Requirement
For projects beginning construction on or after January 1, 2024, qualified apprentices must perform at least 15% of total covered labor hours.
The Labor Hours Requirement measures qualified apprentice hours against total construction, alteration, and repair labor hours, and is tracked at the Project-level.
Ratio Requirement
Qualified apprentices must work within the applicable apprentice-to-journeyworker ratio established by the registered apprenticeship program. These ratios are evaluated on a daily basis.
For example, if a program allows two apprentices for each journeyworker and a contractor has three apprentices working with only one journeyworker, not all apprentice hours will qualify toward the Labor Hours Requirement.
Key Insight: Apprentices must be paid the full prevailing wage for any hours they work that fails to meet the Ratio Requirement. Paying an apprentice full prevailing wage can address a wage issue associated with an improper ratio, but it does not automatically convert the hour into a qualified apprenticeship hour for purposes of satisfying the 15% Labor Hours Requirement.
Good Faith Effort Exception
Qualified apprentices are not always available in sufficient numbers or in every trade and geographic market.
The Good Faith Effort Exception provides important protection where the contractor properly requests apprentices from a registered apprenticeship program but cannot obtain them.
A compliant request generally must be submitted in writing to a registered apprenticeship program that:
- Operates within the geographic area of the project;
- Trains apprentices in the applicable occupation; and
- Normally places apprentices with employers.
The request must contain sufficient detail concerning the workers, hours, dates, location, and occupations requested.
If the apprenticeship program denies the request—or does not respond within five business days—the Good Faith Effort Exception may apply to the portion of the request that could not be filled.
Importantly, the exception is not indefinite. A denied or unanswered request generally provides relief only for the period identified in the request and for no more than 365 days. Additional requests are required for longer periods.
Projects should therefore treat apprentice requests as formal compliance documents rather than informal workforce inquiries.
Apprenticeship Cure Provision
Where the apprenticeship requirements are not satisfied and the Good Faith Effort Exception does not apply, the taxpayer may generally cure the failure through a payment to the IRS.
The standard penalty is:
$50 × the number of labor hours by which the applicable apprenticeship requirement was not satisfied.
For example, assume a project has 10,000 covered labor hours and is subject to the 15% requirement. The project would generally need 1,500 qualifying apprentice hours.
If only 1,300 qualified hours were completed and no Good Faith Effort Exception applies to the remaining hours, the shortfall would be 200 hours:
200 hours × $50 = $10,000 apprenticeship cure payment.
Intentional disregard can result in substantially greater penalties.
Recordkeeping and Reporting
PWA compliance is ultimately a documentation exercise as much as a labor requirement.
Taxpayers must maintain records sufficient to demonstrate that prevailing wage and apprenticeship requirements were satisfied.
Relevant records can include:
- Worker names and identifying information;
- Employer and subcontractor information;
- Labor classifications;
- Hours worked by classification;
- Base wages and fringe benefits paid;
- Applicable wage determinations;
- Construction contracts;
- Registered apprenticeship program documentation;
- Daily apprentice-to-journeyworker ratios;
- Apprentice requests and responses;
- Good Faith Effort documentation;
- Correction payments; and
- Applicable IRS penalty payments.
An accurately completed DOL Form WH-347 can be used as part of the documentation and is considered a best practice.
PWA and Davis-Bacon Are Related, but Not Identical
IRA PWA uses prevailing wage rates, worker classifications, and other concepts derived from the Davis-Bacon framework. However, a project subject to IRA PWA is not necessarily subject to the full Davis-Bacon and Related Acts contracting and reporting framework.
A project receiving separate federal funding may independently trigger Davis-Bacon requirements.
For purposes of tax-credit compliance, project teams should determine which labor requirements apply rather than assuming that IRA PWA and Davis-Bacon compliance are interchangeable.
Form 7220 and Tax Filing
The IRS has introduced Form 7220, Prevailing Wage and Apprenticeship Verification and Corrections, as part of the tax reporting process for taxpayers claiming increased credit or deduction amounts based on PWA compliance.
Form 7220 reports information concerning prevailing wages, apprenticeship compliance, Good Faith Effort claims, and applicable correction or penalty payments.
A separate Form 7220 generally must be filed for each applicable facility claiming an increased amount through PWA compliance.
Projects qualifying for an increased amount exclusively through the one-megawatt exception generally are not required to file Form 7220 solely for PWA.
Managing PWA Compliance During Construction
The taxpayer claiming the incentive remains ultimately responsible for demonstrating compliance. A contract provision requiring a contractor to comply with PWA does not, by itself, transfer that responsibility away from the taxpayer.
For that reason, PWA is best managed as an ongoing construction-compliance process rather than a tax-filing exercise performed after completion.
A practical compliance structure generally includes:
Determine the applicable requirements before construction.
Identify the credit, available exceptions, wage determination, labor classifications, apprenticeship percentage, and post-PIS requirements.Incorporate requirements into contracts.
EPC and contractor agreements should address prevailing wage, apprenticeship participation, required records, subcontractor flow-down provisions, corrective actions, and cooperation with compliance reviews.Collect payroll and apprenticeship information throughout construction.
Waiting until the end of a project can make missing documentation or worker underpayments substantially more difficult to resolve.Review compliance regularly.
Quarterly review is specifically relevant under the IRS intentional-disregard framework. For active construction projects, more frequent payroll review may be appropriate.Track apprenticeship compliance separately.
Projects should monitor total labor hours, qualified apprentice hours, daily ratios, Participation Requirements, and Good Faith Effort requests throughout construction.Correct issues promptly.
Early correction can reduce penalties and provide stronger support that any failure was inadvertent rather than intentional.Maintain a final compliance package.
At completion, the taxpayer should be able to demonstrate how prevailing wages and apprenticeship requirements were satisfied across the taxpayer, contractor, and subcontractor workforce.Plan for post-PIS requirements.
For credits such as 48 and 48E, procedures should remain in place to identify covered alteration and repair work during the five-year post-PIS prevailing-wage period.
PWA Compliance Is a Project-Level Risk
For many clean energy projects, PWA compliance is directly tied to a significant portion of the federal incentive.
A $10 million project eligible for a Section 48E investment credit, for example, may be looking at a difference between a $600,000 base credit and a $3 million increased credit before considering other potential bonus credits.
That makes prevailing wage and apprenticeship compliance more than a payroll issue. It is a material component of the project’s tax-credit strategy, contracting strategy, documentation process, and financial risk management.
Clean Energy Help works with project owners, contractors, developers, nonprofits, municipalities, and other organizations to establish and manage Prevailing Wage and Apprenticeship compliance programs. Support can include determining project requirements, wage and classification analysis, contractor onboarding, payroll and apprenticeship tracking, Good Faith Effort documentation, correction analysis, Form 7220 support, and development of a final PWA compliance package.
For projects relying on federal clean energy incentives, establishing the compliance process early can be significantly easier than trying to reconstruct it after construction is complete.