May 20, 2026
The short answer: The IRA prevailing wage cure and penalty framework lives in 26 CFR 1.45-7 (prevailing wage) and 26 CFR 1.45-8 (apprenticeship). Prevailing wage failures are corrected by paying each underpaid laborer or mechanic the shortfall plus interest at the section 6621 rate with 6 points substituted for 3, plus a $5,000 per worker IRS penalty (tripled to $10,000 for intentional disregard), with a 180-day deadline after IRS final determination. Apprenticeship failures are cured by an IRS-only penalty of $50 per deficient labor hour ($500 for intentional disregard), with no equivalent 180-day cutoff. Treasury finalized both regimes in T.D. 9998 on June 25, 2024.
This guide is built for compliance leads, tax counsel, EPC managers, project developers, and finance teams who need a defensible read on how to fix an IRA prevailing wage and apprenticeship (PWA) failure before it costs the bonus credit. The stakes are real. A mishandled cure can disallow the 5x credit multiplier, trigger recapture on section 48 and 48E investment credits during the 5-year post-placed-in-service window, and remove the rebuttable presumption of no intentional disregard.
The Inflation Reduction Act of 2022 (IRA) attached prevailing wage and apprenticeship requirements to the bonus multiplier on most clean energy tax credits. Congress wrote the cure architecture into the statute itself at section 45(b)(7)(B) for prevailing wage and section 45(b)(8)(D) for apprenticeship, and Treasury operationalized both in T.D. 9998, published June 25, 2024. The two operative regulations are 26 CFR 1.45-7 (prevailing wage cure) and 26 CFR 1.45-8 (apprenticeship cure), with the related recordkeeping rule at 26 CFR 1.45-12.
The defining design choice is that prevailing wage and apprenticeship use different cure mechanics. Prevailing wage is a worker-remediation regime plus a tax penalty. Apprenticeship is a tax-penalty regime plus statutory exceptions. The two systems share intentional-disregard logic and a rebuttable presumption tied to pre-examination correction, but they diverge on deadlines, deficiency procedures, and post-placed-in-service application. Understanding which regime a given failure falls into is the first step in any IRA PWA correction.
The DOL is not the enforcement body. The Department of Labor's IRA prevailing wage page makes clear that the IRA is not a Davis-Bacon Act (DBA) "Related Act." Treasury imported DBA concepts (laborer or mechanic, construction/alteration/repair, site of the work, fringe benefit crediting) but did not import DBA enforcement. IRS administers and enforces the cure framework, and the penalty payments flow to the IRS, not to DOL or to a state labor agency. Wage determinations and additional classification rulings still come from DOL, but the cure itself is a tax matter.
Adjacent compliance mechanics are covered in the related DSPTCH posts on IRA prevailing wage scope of work eligibility, IRA prevailing wage compliance basics, apprenticeship utilization, and certified payroll basics. This post focuses specifically on what to do once a failure is identified.
Under 26 CFR 1.45-7(c)(1), the taxpayer is deemed to have satisfied the prevailing wage requirement for a calendar year if it makes both required payments for each affected laborer or mechanic: (1) a correction payment to the worker covering the wage shortfall plus interest, and (2) a penalty payment to the IRS.
Correction payment formula. The correction payment equals the unpaid wages and fringe benefits plus interest. Interest is computed using the section 6621 underpayment rate with 6 percentage points substituted for the standard 3 percentage points. That effectively doubles the spread above the federal short-term rate and dramatically increases the carrying cost of a stale shortfall.
IRS penalty. The penalty is $5,000 multiplied by the number of laborers and mechanics underpaid during the relevant year. The penalty is counted per worker per year. The regulation's examples confirm that a project with underpayments spanning multiple calendar years stacks the per-worker penalty by year, even where the workers and the underlying shortfall are the same.
Intentional disregard. Under 26 CFR 1.45-7(c)(2), if the IRS determines that the prevailing wage failure was due to intentional disregard, the correction payment is increased to three times the normal correction amount and the IRS penalty becomes $10,000 per affected worker. The regulation defines intentional disregard as a knowing or willful failure and lists nonexclusive factors: whether the taxpayer promptly cured failures, whether classifications and wage rates were periodically reviewed, whether contract terms were flowed down to subcontractors, whether worker complaint procedures existed, and whether records were preserved. None of these factors alone is dispositive. They are evaluated in totality.
Rebuttable presumption. The same provision creates a rebuttable presumption of no intentional disregard if the taxpayer makes the required correction and penalty payments before receiving notice of an IRS examination with respect to the increased credit amount. That presumption is the single most valuable defensive posture available. Self-identification before audit notice converts a triple-damages scenario into a routine cure.
Workers who cannot be located. Under 26 CFR 1.45-7(c)(4), a taxpayer is deemed to have made a correction payment to an unlocatable worker if it complies with applicable state unclaimed property law and all relevant federal and state withholding and information reporting requirements. The preamble makes clear that inability to find the worker does not excuse the correction payment obligation. Escheatment is the path, not an exemption.
Apprenticeship operates on different rails. Under 26 CFR 1.45-8, a taxpayer that fails apprenticeship is still deemed compliant if it either (1) satisfies the Good Faith Effort Exception or (2) pays the apprenticeship penalty. There is no worker-back-pay component analogous to prevailing wage.
Penalty formula. The general penalty is $50 multiplied by the total labor hours for which the labor hours requirement or the participation requirement was not satisfied. For intentional disregard, the penalty rises to $500 per deficient labor hour. As with prevailing wage, the regulation lists nonexclusive intentional-disregard factors, including whether the taxpayer used an apprenticeship utilization plan, whether contractors were required to forward apprentice requests, whether contractor and subcontractor apprentice use was regularly reviewed, and whether records were preserved.
Good Faith Effort Exception. Under 26 CFR 1.45-8(d), a taxpayer is deemed to satisfy apprenticeship if it made a valid written request for qualified apprentices to at least one qualifying registered apprenticeship program and either: (1) the request was denied for reasons not caused by the taxpayer, contractor, or subcontractor, or (2) the program failed to respond within 5 business days. The exception covers only the portion of work tied to the denied or unanswered request and generally cannot extend beyond 365 days without a new request.
No 180-day cure deadline. This is the cleanest doctrinal contrast with prevailing wage. The preamble to T.D. 9998 confirms that section 45(b)(8) does not contain the 180-day-after-final-determination cure cutoff that controls prevailing wage. Deficiency procedures apply to apprenticeship penalties, which means standard notice-of-deficiency and Tax Court litigation paths are available.
Apprenticeship does not apply post-placed-in-service. The same preamble confirms that apprenticeship applies only to construction work, including alteration or repair performed during construction. Post-PIS alteration or repair does not trigger apprenticeship obligations. That means there is ordinarily no apprenticeship cure question for purely post-PIS service work, even when prevailing wage applies.
According to 26 CFR 1.45-7 and 1.45-8, a taxpayer correcting an identified PWA failure should:
(1) Calculate the wage shortfall for each affected laborer or mechanic, including fringe benefits, separated by classification and pay period. Apply the section 6621 underpayment rate plus 6 points to the shortfall from the date wages were due through the date of payment.
(2) Make the correction payment directly to each worker, document delivery, and use state unclaimed property procedures for any worker who cannot be located.
(3) Calculate the $5,000 per worker per year IRS penalty (or $10,000 if intentional disregard) and remit to the IRS together with the correction documentation.
(4) For apprenticeship failures, calculate the labor hours deficiency for both the labor hours requirement and the participation requirement using the formulas in 26 CFR 1.45-8(e). Multiply the deficient labor hours by $50 (or $500 if intentional disregard) and remit.
(5) Self-identify and cure before receiving notice of an IRS examination. That triggers the rebuttable presumption of no intentional disregard and avoids the triple correction payment exposure.
(6) Maintain the records required by 26 CFR 1.45-12, including the amount and timing of any correction and penalty payments, the supporting calculations, eligibility evidence for any waiver claimed, and remediation records.
(7) Check whether the minor and infrequent penalty waiver applies under 26 CFR 1.45-7(c)(3)(i). The penalty is waived for a worker in a calendar year if the correction payment is made by the last day of the first month following the end of the calendar quarter in which the failure occurred, and either the worker was underpaid in not more than 10% of pay periods that year or the aggregate underpayment was not greater than 5% of what should have been paid.
(8) Check whether the work was performed pursuant to a Qualifying Project Labor Agreement (QPLA) under 26 CFR 1.45-7(c)(6). If so, the prevailing wage penalty payments do not apply, provided any correction payment owed is paid on or before the date the increased credit amount is claimed.
(1) Minor and infrequent penalty waiver. Under 26 CFR 1.45-7(c)(3)(i), the $5,000 per worker penalty is waived for a calendar year if the correction payment is made by the last day of the first month following the end of the calendar quarter in which the failure occurred, and either the worker was underpaid in 10% or fewer pay periods that year or the aggregate underpayment was no more than 5% of what should have been paid. Treasury expanded the proposed 2.5% threshold to 5% in the final rule.
(2) Qualifying Project Labor Agreement (QPLA) relief. Under 26 CFR 1.45-7(c)(6) and 26 CFR 1.45-8(f), if work is performed pursuant to a QPLA meeting the regulation's minimum content conditions, the prevailing wage and apprenticeship penalty payments do not apply. The taxpayer must still make any correction payment owed by the date the increased credit amount is claimed. QPLA relief is a penalty rule, not a deemed-compliance rule.
(3) Supplemental wage determination / additional classification exception. Under 26 CFR 1.45-7(c)(5), a taxpayer that timely requested a supplemental wage determination or additional classification from DOL is not considered to have failed prevailing wage for wages paid before the DOL determination, provided the wage differential is paid within 30 days after DOL issues the determination. This prevents a failure from arising rather than curing one.
(4) Good Faith Effort Exception for apprenticeship. Under 26 CFR 1.45-8(d), a denied or unanswered written request to a registered apprenticeship program creates deemed satisfaction of apprenticeship for the affected hours, subject to the 5-business-day response requirement and the 365-day limit.
(5) Transition waivers. The general PWA final regulations waived the prevailing wage penalty for certain work performed on or after January 29, 2023 and before June 25, 2024 if the taxpayer relied on Notice 2022-61 or the proposed PWA regulations and made correction payments within 180 days of June 25, 2024. Section 48 received its own project-specific transition waiver tied to December 12, 2024 in T.D. 9998. Section 48E received a transition waiver tied to January 15, 2025 in T.D. 10024. These are distinct, source-specific transition relief rules.
The penalty schedule is layered. Prevailing wage and apprenticeship analyses run separately.
Prevailing wage correction payment. Wage shortfall plus interest at the IRC section 6621 underpayment rate with 6 points substituted for 3 points, paid to each affected laborer or mechanic.
Prevailing wage IRS penalty. $5,000 per affected worker per year under 26 CFR 1.45-7(c)(1), tripled to $10,000 per worker for intentional disregard under 26 CFR 1.45-7(c)(2).
Intentional disregard correction multiplier. Three times the normal correction payment under 26 CFR 1.45-7(c)(2). The rebuttable presumption of no intentional disregard applies if correction and penalty are paid before notice of IRS examination.
180-day prevailing wage cure deadline. Under 26 CFR 1.45-7(c)(8), once the IRS issues a final determination of failure, the cure is unavailable unless correction and penalty payments are made within 180 days. The preamble states that the 180-day period is not tolled by DOL appeals on wage determinations. If the taxpayer refuses to pay, the penalty is not assessed, but the increased credit amount is disallowed under standard deficiency procedures.
Apprenticeship penalty. $50 per deficient labor hour under 26 CFR 1.45-8(e), rising to $500 per labor hour for intentional disregard. There is no 180-day deadline. Deficiency procedures apply.
Section 48 and 48E recapture. Under 26 CFR 1.48-13 and 26 CFR 1.48E-3, if a post-placed-in-service prevailing wage failure occurs during the 5-year recapture period and is not cured within 180 days after final determination, the increased credit amount is subject to recapture. Recapture on the bonus multiplier can dwarf the underlying wage shortfall.
Penalty payment is assessed without deficiency procedures. Under section 45(b)(7) and the implementing regulation, the prevailing wage penalty is assessable and collectible without regard to deficiency procedures. The taxpayer may seek a refund of the penalty after paying. Apprenticeship penalties, by contrast, are subject to deficiency procedures and can be litigated pre-payment.
Direct IRS enforcement actions under the 2024 final regulations are still building, in part because the cure framework only became operative on January 29, 2023 for early-action projects and on June 25, 2024 for full final-rule applicability. IRS issued its PWA Frequently Asked Questions page, most recently updated June 18, 2024, as the primary public-facing channel for taxpayer guidance, including cure mechanics.
The cleanest defensive posture continues to be (1) self-identification and cure before notice of examination to lock in the rebuttable presumption of no intentional disregard, (2) contemporaneous documentation under 26 CFR 1.45-12 of correction and penalty calculations, (3) DOL-issued wage determinations matched to worker classifications, and (4) QPLA structuring where the project economics support it.
DOL Wage and Hour Division continues to pursue Davis-Bacon enforcement on federally funded projects that overlap with IRA-eligible scopes. While DOL findings do not directly impose the IRA penalty schedule, they generate the classification rulings and back-wage findings that inform later IRS assessments. Contractors who lose a DBA classification dispute on a federally funded clean energy project should expect the same classification to surface in any IRA PWA examination of the same scope.
Mistake 1: Waiting past the rebuttable presumption window. The single most valuable defensive position is the rebuttable presumption of no intentional disregard, which requires correction and penalty payments before notice of IRS examination. Self-identification two weeks before audit notice converts a $10,000-per-worker triple-damages exposure into a routine $5,000-per-worker cure. Once notice arrives, the presumption is gone.
Mistake 2: Confusing the Good Faith Effort Exception with the apprenticeship cure penalty. The Good Faith Effort Exception is a statutory exception, not a cure. It applies only where the taxpayer made a valid written request to a registered apprenticeship program and the program either denied the request for reasons not caused by the taxpayer or failed to respond within 5 business days. Verbal requests, requests sent to non-registered programs, and undocumented requests do not qualify. Once you are outside the Good Faith Effort Exception, the cure path is the $50 per deficient labor hour penalty.
Mistake 3: Treating subcontractor records as the subcontractor's problem. Treasury rejected comments suggesting that missing lower-tier subcontractor records should excuse compliance. The taxpayer is responsible under section 6001 and 26 CFR 1.45-12 for maintaining records adequate to establish compliance. Missing subcontractor data does not excuse the taxpayer's cure obligation. The fix is contractual flow-down and active record collection during the project.
Mistake 4: Missing the section 48 and 48E recapture exposure on post-PIS work. For investment-credit projects, a prevailing wage failure on a post-PIS alteration or repair during the 5-year recapture period that is not cured within 180 days after IRS final determination subjects the entire increased credit amount to recapture under 26 CFR 1.48-13. The economic risk on a 2030 inverter replacement at a 2026 PIS project is not the back wages. It is the recapture on the bonus multiplier earned at original PIS.
How do you cure an IRA prevailing wage failure?
Under 26 CFR 1.45-7(c)(1), the taxpayer pays each underpaid laborer or mechanic the wage shortfall plus interest at the section 6621 underpayment rate with 6 points substituted for 3, and pays the IRS a $5,000 per affected worker per year penalty. The cure must be completed within 180 days after IRS final determination of failure under 26 CFR 1.45-7(c)(8). Self-curing before notice of IRS examination triggers the rebuttable presumption of no intentional disregard.
What is the apprenticeship cure penalty under section 45(b)(8)?
Under 26 CFR 1.45-8(e), the penalty is $50 multiplied by the total labor hours for which the labor hours requirement or participation requirement was not satisfied. Intentional disregard raises the penalty to $500 per deficient labor hour. There is no worker back-pay component. The Good Faith Effort Exception, if available, eliminates the failure rather than curing it.
How many days does a taxpayer have to cure an IRA prevailing wage failure?
Under 26 CFR 1.45-7(c)(8), the cure must be made within 180 days after the IRS final determination of failure. The preamble to T.D. 9998 confirms that the 180-day period is not tolled by DOL wage-determination appeals. Apprenticeship has no equivalent 180-day deadline; deficiency procedures apply.
Does a Qualifying Project Labor Agreement eliminate IRA prevailing wage penalties?
A QPLA under 26 CFR 1.45-7(c)(6) eliminates the prevailing wage penalty payments and, under 26 CFR 1.45-8(f), the apprenticeship penalty payments. It does not eliminate the underlying correction payment obligation. Any correction payment must be paid on or before the date the increased credit amount is claimed. The QPLA must meet the regulation's minimum content conditions.
What is the rebuttable presumption of no intentional disregard?
Under 26 CFR 1.45-7(c)(2) and 26 CFR 1.45-8(e)(2), the taxpayer is presumed not to have acted with intentional disregard if it makes the required correction and penalty payments before receiving notice of an IRS examination of the increased credit amount. The presumption converts a potential triple-damages or $10,000-per-worker scenario back into the ordinary cure framework. The IRS can rebut the presumption, but the burden shifts.
What happens if a laborer or mechanic cannot be located for the correction payment?
Under 26 CFR 1.45-7(c)(4), the taxpayer is deemed to have made the correction payment if it complies with applicable state unclaimed property law and all relevant federal and state withholding and information reporting requirements. Escheatment is the path. Inability to find the worker does not excuse the correction payment obligation.
Does a prevailing wage failure during the section 48 5-year period trigger recapture?
Yes, if the failure is not cured. Under 26 CFR 1.48-13, a post-placed-in-service prevailing wage failure on alteration or repair during the 5-year recapture period subjects the increased credit amount to recapture if correction and penalty payments are not made within 180 days after IRS final determination. Section 48E carries the same recapture logic under 26 CFR 1.48E-3.
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