IRS Section 48 Energy Credit: Rates, Bonuses, and Recapture

The Section 48 energy credit is a federal investment tax credit that cuts your tax bill by 6% to more than 50% of what you spend on qualifying clean energy property, with the exact rate driven by labor practices, project location, sourcing, and community served. Before going further, confirm the credit applies to you: Section 48 generally covers projects that began construction before January 1, 2025. If construction started on or after that date and the property is placed in service after December 31, 2024, you are almost certainly under the technology-neutral Section 48E credit instead. The frameworks are nearly identical, so the rates, labor rules, bonus adders, and filing steps below carry over to 48E projects.¹²

A single project can technically qualify under both sections, but you cannot claim both for the same property. The main substantive difference is that Section 48E turns on a facility’s greenhouse gas emissions rate rather than a statutory list of eligible equipment.

What Property Qualifies

To claim the credit, property must be placed in service during the tax year, must be new (original use begins with you), and must be depreciable. The statute lists the specific categories that qualify:³

Solar energy equipment that generates electricity, heats or cools a building, or provides process heat (swimming pool heaters are excluded)
Geothermal equipment used to produce, distribute, or use energy from a geothermal deposit, up to but not including the electrical transmission stage
Qualified fuel cell and microturbine property
Small wind energy property
Combined heat and power systems
Ground-source heat pumps (construction must begin before January 1, 2035)
Waste energy recovery property
Energy storage technology, including battery systems
Qualified biogas property, including cleaning and conditioning equipment
Microgrid controllers

One restriction catches developers off guard: property cannot qualify under Section 48 if the facility’s production is already being used to claim a Section 45 production tax credit for the same tax year or any prior year.³

How the Rate Is Built: Base, Multiplier, and Bonuses

The statutory base rate is 6% of eligible cost basis. That is what your project gets if it does not meet the prevailing wage and apprenticeship requirements. Meeting those requirements multiplies the base by five, taking the credit to 30%.³⁴

Two categories get the 30% rate automatically without meeting the labor standards: projects with a maximum net output under one megawatt, and projects that began construction before January 29, 2023 (the date the IRS published its prevailing wage and apprenticeship guidance). Every other project is looking at a five-fold swing in credit value tied to labor compliance.

Three separate bonuses can stack on top.

Energy Community Bonus

A project placed in service inside an energy community earns 10 additional percentage points if it meets the labor requirements, or 2 percentage points if it does not.³ Three categories qualify: brownfield sites; census tracts (or adjoining tracts) with significant fossil fuel employment and above-average unemployment; and census tracts where a coal mine has closed since 1999 or a coal-fired generating unit has been retired since 2009. Qualifying under any one category is enough.⁵

Domestic Content Bonus

If all steel and iron components are produced in the United States and a threshold percentage of the manufactured products are domestically sourced, the credit gets another 10 percentage points (or 2 points without labor compliance).³ The manufactured-product threshold rises over time, so verify the number that applies in your placed-in-service year.

Low-Income Community Bonus

A separate allocated bonus is available for projects serving low-income communities. Four categories qualify: projects in a low-income community (10 points), projects on Indian land (10 points), qualified low-income residential building projects (20 points), and projects providing economic benefit to low-income households (20 points).⁶

Unlike the energy community and domestic content adders, this one is not automatic. You have to apply through a competitive allocation program with an annual capacity cap of 1.8 gigawatts split across the four categories. The 2026 application window opened February 2, 2026.⁷ For projects placed in service after 2024, the successor program runs under Section 48E(h), with essentially the same structure.

Stacked to the ceiling, a project that meets prevailing wage and apprenticeship rules, uses domestic content, sits in an energy community, and wins a low-income residential building allocation could reach 70% of basis. Most well-planned projects land somewhere in the 40% to 50% range.

The Prevailing Wage and Apprenticeship Rules

Almost the entire credit hinges on these, so getting them wrong is expensive. Every laborer and mechanic working on construction, alteration, or repair of the facility must be paid the prevailing wage for their job classification and location, using Department of Labor rates published on SAM.gov.⁸

The obligation continues past construction. Prevailing wages must also be paid on any alteration or repair work during the five-year recapture period after the property is placed in service. A failure during that window can trigger recapture of the increased credit amount, subject to the same cure options.

The apprenticeship requirement is separate. For projects that began construction after 2023, at least 15% of total labor hours must be performed by qualified apprentices registered in approved programs. Each contractor and subcontractor must independently meet the applicable apprentice-to-journeyworker ratio set by the Department of Labor or the state apprenticeship agency. A good-faith exception applies if you request apprentices from a registered program and the program cannot supply them.

Curing a Wage Failure

A wage shortfall does not automatically drop you to the 6% rate. You can cure it by paying each affected worker the difference between what they received and what they should have been paid, plus interest at the federal short-term rate plus six percentage points, and paying the IRS a $5,000 penalty for each worker underpaid during the year.⁴ If the IRS determines the failure was intentional, both the back-pay obligation and the penalty rise substantially.

Documentation is what makes cure work in practice. Keep payroll records for every laborer employed by you, your contractors, and your subcontractors, and expect to verify compliance annually throughout the recapture period.

Recapture During the Five-Year Window

If you dispose of the property or it stops being investment credit property within five years after it was placed in service, part of the credit is owed back. The recapture percentage steps down each year:⁹

Within one year: 100% recaptured
Within two years: 80% recaptured
Within three years: 60% recaptured
Within four years: 40% recaptured
Within five years: 20% recaptured

After five full years, the credit vests and no recapture applies.

Basis Reduction

Claiming the Section 48 credit reduces the depreciable basis of the property by 50% of the credit amount. Section 50(c) normally requires a full basis reduction equal to the credit, but a special rule for energy credits cuts that in half.⁹ If recapture occurs later, basis is increased by 50% of the recapture amount.

Lower basis means smaller annual depreciation deductions across the recovery period. In a project model, the true net tax benefit is the credit minus the present value of those lost depreciation deductions. Overlooking this adjustment is a common mistake that overstates project returns.

Turning the Credit Into Cash: Direct Pay and Transferability

The Inflation Reduction Act added two mechanisms so entities without large tax bills can still capture the credit’s value.

Direct Pay

Certain applicable entities can elect to receive the credit as a cash payment from the IRS, treated as an overpayment of tax. Applicable entities include tax-exempt organizations, state and local governments, the Tennessee Valley Authority, Indian tribal governments, Alaska Native Corporations, and rural electric cooperatives.¹⁰

Transferability

Any taxpayer that is not an applicable entity can sell all or part of the credit to an unrelated buyer for cash. Payment must be in cash. The seller does not include it in gross income, and the buyer cannot deduct it.¹¹ In practice, credits have traded in the range of $0.85 to $0.95 per dollar of credit, with pricing shaped by project risk, timing, and market conditions.

The buyer steps into the seller’s shoes for recapture. If a recapture event hits during the five-year window, the buyer owes the recapture tax, not the seller. That risk allocation is usually addressed by indemnification in the transfer agreement and is a major factor in pricing.

Filing the Claim

Two mechanical steps trip up otherwise clean claims: pre-registration and form sequence.

Pre-Filing Registration

If you plan to elect direct pay or transfer the credit, you must register each qualifying property through the IRS Energy Credits Online (ECO) portal before filing your return. Register after the property is placed in service and at least 120 days before the due date (including extensions) of the return that will report the credit.¹² The IRS issues a unique registration number for each property, and that number must appear on your return. Without it, the direct pay or transfer election is invalid.

Each entity making an election needs its own Employer Identification Number and its own ECO account. Do not use another entity’s EIN, even for closely related affiliates.¹²

Forms

Calculate the credit on Form 3468 (Investment Credit), reporting eligible basis, the applicable energy percentage, and any bonus adders. The registration number goes on this form.¹³ The result flows to Form 3800 (General Business Credit), which aggregates business credits and determines how much you can use against the current year’s tax.¹⁴ Tax-exempt entities electing direct pay generally report the credit on Form 990-T. In a credit sale, both transferor and transferee report the transaction, including the registration number and the amount transferred.

Because the pre-registration deadline, labor documentation, and bonus-eligibility determinations all have to line up before the return is filed, most developers engage a tax advisor well before the property is placed in service rather than assembling the claim at filing time.

1
Internal Revenue Service. Tax-Exempt Entities and the Investment Tax Credit (Section 48 and Section 48E)
2
Internal Revenue Service. Clean Electricity Investment Credit
3
Office of the Law Revision Counsel. 26 US Code 48 – Energy Credit
4
Internal Revenue Service. Frequently Asked Questions About the Prevailing Wage and Apprenticeship Under the Inflation Reduction Act
5
Internal Revenue Service. Frequently Asked Questions for Energy Communities
6
Internal Revenue Service. Clean Electricity Low-Income Communities Bonus Credit Amount Program
7
Department of Energy. Clean Electricity Low-Income Communities Bonus Credit Amount Program
8
U.S. Department of Labor. Davis-Bacon Wage Determinations
9
Office of the Law Revision Counsel. 26 US Code 50 – Other Special Rules
10
Office of the Law Revision Counsel. 26 US Code 6417 – Elective Payment of Applicable Credits
11
Office of the Law Revision Counsel. 26 US Code 6418 – Transfer of Certain Credits
12
Internal Revenue Service. Register for Elective Payment or Transfer of Credits
13
Internal Revenue Service. IRS Form 3468 – Investment Credit
14
Internal Revenue Service. Instructions for Form 3468