Solar IRA Tax Credits: 25D Ended, 48E Rules

Last updated: November 2026

Solar tax credits now require a project-specific timeline. A homeowner buying a new array and a business funding a commercial installation cannot use the same incentive assumptions. This guide separates the ownership decision from construction timing, labor rules and the evidence needed for bonus credits.

The 2026 Solar Tax Credit Landscape: What Changed

Section 25D ended for expenditures after December 31, 2025. Section 48E remains available for eligible investments, with new solar-specific timing and foreign-entity restrictions. Read each rule against the project facts rather than copying a previous proposal.

The Inflation Reduction Act introduced the clean electricity credit framework. Public Law 119-21, enacted July 4, 2025, subsequently changed it. The IRS guidance on the 2025 law explains that paying before the residential deadline does not preserve 25D for an installation completed later.

For commercial work, start with the current Section 48E statute and the relevant IRS notices. Some general IRS credit overview pages still display the earlier phaseout summary; the later law and project-specific guidance must govern deadline analysis.

Keep three questions separate in the project file. Who is the tax owner? What construction and service dates can the records support? Which credit conditions can the owner substantiate? A favorable answer to one cannot replace the others.

For a project already in progress, preserve the original contracts and contemporaneous records. Do not change an old commencement narrative simply to match a more favorable rule. Ask the adviser to identify the applicable guidance and explain any uncertainty in writing.

Section 25D vs. Section 48E: Side-by-Side Comparison

Ownership determines the starting point for credit analysis. The table distinguishes a personal residential claim from a business investment; it is not an eligibility certificate.

Sources: IRS guidance on 25D termination and the Section 48E statute linked above, opened November 6, 2026.

The end of 25D changes the comparison between cash purchase, financed ownership, leasing and power purchase agreements. It does not prove that a lease is cheaper. The third-party owner may qualify for a business credit, but the contract determines whether the customer receives any economic benefit.

Ask for the complete payment schedule, escalation terms, transfer conditions, maintenance scope and end-of-term options. Compare those terms against owning the system without a new 25D credit. Avoid subtracting a lessor’s tax credit from the homeowner’s purchase price as though the homeowner receives it directly.

Section 48E: How the Active Credit Works

Section 48E is an investment credit based on qualified investment in eligible facilities and energy storage. Solar generation and storage need their own property, timing and ownership analysis even when supplied under one contract.

The IRS Section 48E overview describes a 6% base rate and a higher 30% rate when the relevant conditions are met. It also identifies Form 3468 and the potential use of transferability or elective pay. Use that overview for the mechanism, with later guidance for deadlines.

Who claims it: Identify the tax owner and entity before building a financial model. The EPC contractor does not receive the customer’s credit merely because it installed the array. A residential lessor may be the tax owner, while the resident pays under a separate contract.

Which costs qualify: Keep the equipment and construction cost ledger separate from a broad turnkey quote. Have the adviser determine the eligible basis of generation equipment, storage, interconnection and shared work. Roof replacement, financing and unrelated building improvements should not enter the credit calculation simply because they appear on the same invoice.

When it is claimed: Service status is a tax question supported by completion, commissioning and readiness evidence. A signed purchase order or equipment delivery alone should not be labeled placed in service. Preserve the project’s approved date and the reasoning behind it.

Credit Rate Structure

The difference is 24 percentage points of qualified investment. For an illustrative $5 million eligible basis, that is $1.2 million. This arithmetic explains why labor compliance matters; it says nothing about whether a particular owner qualifies or can use the resulting credit immediately.

What the 48E Phase-Out Schedule Looks Like

Do not apply a generic declining credit-rate schedule to a solar bid. Construction commencement, placed-in-service timing and the applicable credit conditions must be assessed together.

For applicable solar facilities, IRS Notice 2025-42 explains the accelerated termination rule. Construction beginning after July 4, 2026 generally brings a December 31, 2027 placed-in-service deadline. A qualifying earlier start can avoid that accelerated cutoff, subject to continuity and all other requirements.

This distinction matters in November 2026: the earlier-start date has passed, but projects with later starts are not automatically disqualified. Assess whether the remaining delivery schedule can support timely service. Obtain a separate assessment for storage rather than assigning it the solar facility’s termination rule by default.

Prevailing Wage and Apprenticeship Requirements

Prevailing wage and apprenticeship, usually shortened to PWA, are separate compliance requirements for the higher credit rate unless an exception applies. A payroll rate alone cannot demonstrate apprenticeship compliance, and apprentice hours alone cannot establish wage compliance.

The IRS PWA FAQs explain wage classifications, apprentice hours, ratios and participation. Use the project’s tax and labor advisers to turn those requirements into contract clauses and a recordkeeping plan.

Prevailing Wage

Identify the relevant laborers and mechanics, work classifications and wage determinations. Assign someone to check payroll records from both the main contractor and subcontractors. Resolve classification questions before crews accumulate hours under an incorrect rate.

Retain the wage determination used, worker classifications, pay evidence, hours and any correction records. Link contractor submissions to the specific project rather than accepting a company-wide assurance. The owner needs evidence that can support the tax claim after the installation team has moved on.

Do not quote a generic wage premium or assume that compliance always adds a fixed percentage to labor cost. Compare the required rates with the actual bid staffing plan. Likewise, correction payments and penalties are not a simple 5% surcharge; ask the adviser to apply the applicable rules to the particular failure.

Apprenticeship Requirements

The IRS identifies three parts: labor hours, apprentice-to-journeyworker ratios and participation. Its published labor-hour percentages are:

These percentages do not replace the ratio and participation requirements. Keep registered program information, apprentice assignments, daily records and contractor coverage together. If relying on an exception, retain the requests and responses that the rule requires.

A claim of good-faith effort needs evidence and adviser review. A verbal statement that apprentices were unavailable is not an adequate project record. Define who sends requests, who receives replies and who checks whether another request is needed as the work changes.

Bonus Adders: Stacking Up to 70%

Bonus credits are conditional additions, not a standard discount. Screen each independently and keep unapproved bonuses out of the committed financial case.

Domestic Content Adder

The IRS domestic-content guidance describes the bonus and certification requirements. At the qualifying higher rate it can add 10 percentage points; at the base rate the increase is 2 points.

Domestic content involves separate treatment of steel or iron and manufactured products. A US distributor invoice, domestic final assembly claim or familiar brand name is insufficient by itself. Ask for evidence that matches the applicable calculation method and installed bill of materials.

The statute lists a 50% adjusted manufactured-product percentage for 2026 construction starts and 55% for starts after December 31, 2026. These percentages are not a prohibited-foreign-entity sourcing threshold. Avoid mixing the calculations in a procurement spreadsheet.

Have the adviser specify the evidence needed before accepting a substitution. A module change can affect sourcing analysis even if the nameplate capacity and electrical design remain similar. Preserve the originally approved product schedule alongside the replacement assessment.

Energy Community Adder

An eligible location can support an energy-community bonus, but geographic screening is only the first step. The exact category, qualifying area, date and supporting evidence matter. Ask the adviser to identify the applicable IRS energy-community guidance for the project.

Keep the site coordinates, relevant geographic designation and dated source evidence in the claim folder. A salesperson’s map screenshot should point to the underlying designation rather than stand alone. Do not describe entire regions as automatically eligible.

This check belongs early in project development because location evidence may be straightforward to collect then. Still, budget time for review. A bonus is not cost-free if documenting and maintaining eligibility changes the project’s work or financing requirements.

Low-Income Community Adders

The IRS low-income bonus program is an allocation program for facilities below 5 MW. It provides 10- or 20-percentage-point increases under different categories. The categories are alternatives, not separate bonuses to add together.

An application is not an award. Record the program year, award status, facility capacity and any deadlines or conditions attached to the allocation. Check the program’s service timing requirements before advancing construction or commissioning.

How Adder Stacking Works

The following is conditional arithmetic, not a prediction of a typical credit:

A project must satisfy every condition shown in its row. In particular, do not apply the last row to a large utility facility that exceeds the low-income program limit. The combined result also needs review against the owner’s actual qualified investment and tax treatment.

Present the approved case and a separate contingent-bonus case. Identify the evidence still missing and the person responsible for closing that gap. This keeps a possible bonus from becoming an unconditional promise in the customer’s financing decision.

FEOC Compliance: Separate the New Sourcing Rules

Prohibited foreign entity, or PFE, restrictions need a separate review from domestic-content bonuses. Public discussion often uses FEOC terminology, but the project file should use the definitions in the controlling law and guidance.

What Counts as a Prohibited Foreign Entity

The rules concern ownership, control and other specified relationships, not just the country printed on a product label. Do not classify a supplier solely by headquarters, branding or an assumed ownership percentage.

The IRS explanation of Notice 2026-15 identifies interim guidance for material assistance and other PFE restrictions. Ask counsel to determine which restrictions apply to the taxpayer, transaction and construction date.

How the Restriction Works

Material-assistance analysis uses its own definitions, cost ratio and substantiation requirements. The domestic-content percentage from the preceding section cannot serve as a shortcut. Do not replace missing supplier evidence with a list of supposedly safe brands.

Create an evidence register for each major equipment package. Record the exact model, manufacturer legal entity, sourcing representations, declaration date, relevant cost information and the reviewer’s decision. Keep uncertainty visible while procurement is still flexible.

Practical Equipment Implications

This is a procurement review checklist, not a compliance ranking of manufacturers. Keep the approved tax assessment attached to the installed equipment list. A purchasing substitution should trigger both engineering and tax review when relevant.

Earlier construction dates can affect which provisions apply, but they do not justify a blanket statement that a project is exempt from every foreign-entity rule. Preserve the commencement evidence and ask for a provision-by-provision conclusion.

MACRS Depreciation: Keep It Separate From the Credit

Depreciation is a deduction from taxable income, while an investment credit reduces tax under the applicable credit rules. Adding the face value of a deduction to the face value of a credit overstates the benefit.

How Solar MACRS Works

The Modified Accelerated Cost Recovery System (MACRS) determines how eligible business property is depreciated. Property classification, acquisition facts, conventions and elections affect the schedule. A solar project should not inherit a generic schedule solely because another array used it.

IRS Publication 946 discusses both changes to energy-property classifications and restored bonus depreciation. Have the accountant identify the applicable property category and acquisition date for each package, especially when a project mixes solar, storage and building work.

The ITC Basis Adjustment

The accountant should calculate the depreciable basis after the required credit-related adjustment. Keep that result separate from the credit basis and total project cost. Different numbers in those fields may be correct if the work includes ineligible costs or other adjustments.

An effective review sheet shows the gross cost, exclusions, approved credit basis, credit amount, basis adjustment and remaining depreciation basis. Every difference should trace to an invoice allocation or tax decision. Do not silently overwrite the engineering budget to make it match the tax worksheet.

Bonus Depreciation in 2026

Publication 946 describes restored 100% bonus depreciation for certain qualified property acquired and placed in service after January 19, 2025. The old blanket assumption of 20% for 2026 is therefore unsuitable. Eligibility, acquisition rules and elections still need project-specific review.

As an illustrative arithmetic example, a $100,000 deduction at an assumed 21% tax rate corresponds to $21,000 of tax reduction before other limitations. It is not a $100,000 tax payment. The owner’s adviser must determine the actual rate, usable deduction and timing.

Use a tax schedule that distinguishes deductions from cash savings. If the owner cannot use a benefit immediately, shift its modeled timing according to the adviser’s instructions rather than presenting it as money available at commissioning.

Compare the project with and without accelerated deductions if acquisition eligibility remains unresolved. Label the uncertain case and keep the underlying cost and energy assumptions the same. That makes the tax assumption’s effect visible without implying certainty.

Credit Monetization: Transfer and Direct Pay

A credit’s face value and the project’s available cash are different quantities. Transferability and elective pay offer different routes, with their own qualification and filing requirements.

Credit Transferability

The IRS transferability FAQs explain elections to transfer eligible credits. Obtain tax and transaction advice before assuming a transfer can replace an equity contribution or construction loan.

A transfer model should separate the credit face value, agreed purchase price, fees, insurance if applicable and payment timing. This guide does not publish a market discount range because executable terms depend on the actual transaction. Use a buyer indication or signed agreement and show its date.

Require a written responsibility matrix for eligibility review, registration, tax returns, transfer statements and post-closing questions. The project’s engineering team can supply equipment and commissioning records, but the transaction and tax teams must approve the election documents.

Test a delayed-closing scenario. If transfer proceeds arrive later than the equipment invoice or loan repayment, the project still needs interim funding. A nominal tax benefit cannot pay a supplier before it becomes available cash.

Direct Pay (Elective Pay)

The IRS elective-pay FAQs describe how applicable entities can treat eligible credit amounts as payments of tax. Potential users include qualifying tax-exempt organizations and governmental entities.

Do not promise an immediate grant at contract signing. The entity must satisfy eligibility, registration and return requirements, and the financing plan must account for timing. Identify who will prepare and file the claim before relying on it in a public-sector procurement.

Domestic-content requirements can reduce elective-pay amounts for some projects. Exceptions and transition guidance may apply; the IRS domestic-content page links the relevant rules. Neither project size nor foreign-made equipment alone is a complete analysis.

Ask the adviser to document the applicable exception or compliance method rather than placing an unconditional payment in the base case. Preserve any required attestation and supporting procurement records. Assign a filing owner who remains accountable after construction handover.

Section 45Y Production Tax Credit: When to Compare It With the ITC

Section 45Y is based on eligible electricity production rather than upfront investment. It deserves a separate financial comparison when the owner and facility may qualify; it is not an additional credit to add to the ITC for the same facility.

The IRS production-credit overview explains the production basis and inflation adjustment. Use the applicable published annual rate in a tax-reviewed model rather than carrying forward a stale cents-per-kWh assumption.

A generic capacity-factor threshold cannot select the better credit. Compare the eligible basis, generation forecast, degradation, curtailment, financing and tax timing. Keep the same engineering case in both models so the comparison isolates the incentive choice.

Bonuses do not work identically across the two credits. Do not copy ITC percentage-point additions into a production-credit formula or add a low-income ITC allocation to 45Y. Have the adviser verify the relevant provisions before presenting either case to an investment committee.

How Installers Can Use IRA Credits as a Sales Tool

A useful proposal explains assumptions and responsibilities without promising a tax outcome. The customer should be able to distinguish the installed price from an estimated after-tax result.

Commercial Solar Sales

Start with the engineering case: consumption, layout, modeled generation and expected operating costs. Then add tax assumptions approved for the owner. A customer with the same roof but a different entity structure may need a different financial model.

Show the gross contract price, approved eligible basis, credit scenario, depreciation assumptions and expected cash timing. Keep incentives contingent on an allocation, supplier declaration or labor review clearly labeled. Avoid a universal payback claim because tariffs, financing and operating conditions vary.

Use project financial modeling to compare consistent inputs. SurgePV supports financial modeling; tax advisers remain responsible for legal conclusions and filing positions. Software output should not be presented as IRS approval.

Third-Party Ownership for Residential

A lease or power purchase agreement separates the system owner from the household using the electricity. The owner’s potential business credit does not become a personal credit for the resident. Any customer saving comes through the agreed commercial terms and actual energy outcome.

Compare purchase and third-party options using full contract payments, escalation, utility imports, export compensation and exit terms. Describe maintenance and equipment replacement responsibilities. If the offer depends on the lessor’s credit eligibility, explain that dependence without suggesting the household receives the credit itself.

Proposal Documentation

Include the following in the financial appendix:

1. The project and owner identity used in the analysis.
2. The equipment schedule, capacity basis and design revision.
3. The gross price and tax adviser’s eligible-basis calculation.
4. Each proposed credit, its status and supporting evidence.
5. Deductions shown separately from credits and cash receipts.
6. Service timing, filing assumptions and expected benefit timing.
7. A downside case for unresolved eligibility or delayed proceeds.

Customer proposal outputs can present the engineering and financial scenario together. Keep the tax assumptions in a clearly labeled section so later reviewers can see what changed when a project revision is issued.

State Tax Credits That Stack With the Federal ITC

State and utility incentives need individual review. A rebate, renewable-energy certificate, property-tax treatment and income-tax credit are different mechanisms and should not share one generic savings line.

State program names, eligibility and available funding can change, and a residential program may not apply to a commercial owner. Open the administering agency’s current page for the exact service territory and customer type before including a benefit.

These are due-diligence categories, not a list of currently available offers. Keep the source URL, date accessed, application status and expiry conditions next to every incentive in the model.

Ask the accountant whether a payment changes qualified basis or taxable income. Do not assume that every rebate reduces basis, or that every exemption leaves federal calculations unchanged. The answer depends on the payment’s legal and tax character.

For sales use, prepare a source packet that a customer’s adviser can check. A dated award or reservation is more useful than a copied headline. If funding is uncertain, put the amount in a separate scenario and identify the decision needed before it can enter the base case.

Documentation and Filing Guide

Prepare the evidence while the work happens. Reconstructing acquisition dates, labor records and equipment substitutions after commissioning makes tax review harder.

The IRS Section 48E overview identifies Form 3468 as the investment-credit form. The tax preparer should determine the complete return package, elections and registration requirements for the owner. An EPC handover pack supplies evidence; it does not replace the tax filing.

Timeline for Claiming the Credit

Form 3468 Requirements

Use the instructions for the applicable tax year. Build a cross-reference between the return figures and the underlying cost ledger. Keep qualification, bonus and service-date evidence accessible to the person signing or preparing the return.

For domestic-content claims, retain the approved calculation and supplier documents for the installed equipment. For energy-community claims, retain the location and qualifying designation evidence. For low-income allocations, retain award conditions and the documents demonstrating that they were satisfied.

If transferring a credit or electing payment, add a separate filing checklist. Track registration, required forms, statements and deadlines. Assign each task to a named person rather than assuming the installer, accountant and finance provider are covering one another’s responsibilities.

Record Retention

Have the tax adviser set the retention period for the claim, basis, carryforwards and possible recapture exposure. A general three-year record rule is not enough to determine how long every solar-credit document should be kept.

Retain original evidence and the versions used for the filed claim. Protect access to payroll and taxpayer information. Keep an index that lets a later reviewer trace a reported number to a specific invoice, declaration or approved calculation.

The July 4, 2026 Deadline: What Installers Must Check Now

The construction-start date has passed, so the task is to assess evidence and completion plans. Do not tell every project that missed it that the credit is lost.

Under Notice 2025-42, later-starting applicable solar facilities generally need to be placed in service by December 31, 2027. Earlier starts require a valid commencement method and continuity. Have the adviser assess the specific record, including the notice’s effective-date provisions.

Physical work: The notice focuses on work of a significant nature, not a minimum spending percentage. Qualifying work may occur on site or off site under the specified contract conditions. Planning, permitting and site clearing are listed as preliminary activities and should not be relabeled as qualifying work.

Five-percent safe harbor: The notice restricts this route for its deadline analysis. It retains a path for qualifying low-output solar facilities with maximum net output no greater than 1.5 MW AC, subject to the facility and aggregation rules. It is not a general procurement shortcut for every commercial array.

Continuity: Establishing a start date is not the last step. Review continuity and any applicable safe harbor, including how delays are documented. A purchase invoice without the supporting legal and construction facts cannot settle the issue.

For each project, write a short timeline with dated evidence and unresolved questions. Ask the reviewer to identify which route applies, why it applies and what work remains necessary. If the project relies on the 2027 service deadline, include utility and commissioning dependencies in the delivery plan.

A schedule contingency should be operationally realistic. Identify the effect of equipment delays, interconnection work, inspection resubmissions and customer access. Keep a financial downside case if timely service remains uncertain rather than promising a deadline the installer cannot control.

Installer Profit Margins and the ITC’s Effect

The customer’s credit is not installer revenue. Estimate project margin from the contract price and delivery cost, with a separate view of the owner’s after-tax economics.

A potential credit may influence a buying decision, but it does not guarantee a higher close rate, larger system or shorter payback. Use the actual customer’s load, tariff, financing and eligibility. Keep commercial discounts distinct from incentives that the owner may later claim.

Price compliance work explicitly. Labor reporting, sourcing evidence, tax-support schedules and revision management require staff time. Assigning those responsibilities at contract stage makes them easier to budget and avoids disputes about who will supply the final evidence.

If a customer changes ownership structure or financing midway through delivery, reopen the financial assumptions. The engineering scope may remain similar while the tax case changes. Issue a revised proposal that identifies the changed assumptions and preserves the prior version.

Conclusion

Start with ownership and eligibility, then verify the project timeline. Apply bonus credits only after each condition has evidence, and treat deductions and monetization as separate calculations.

Before issuing a final commercial offer, get written approval of the tax assumptions and document open conditions. Compare the approved case against a delay or lost-bonus case so the customer can see the financial exposure.

For the design and proposal workflow, bring a reviewed scenario to a SurgePV demo. Keep the tax adviser’s determination attached to the financial assumptions used in the customer-facing proposal.

Frequently Asked Questions

Did the residential solar tax credit expire?

Section 25D is unavailable for expenditures made after December 31, 2025. IRS guidance says paying before that date does not preserve the credit for an installation completed afterward. Previously earned credit carryforwards are a separate filing question.

Is the commercial solar tax credit still 30%?

An eligible Section 48E investment can receive 30%, but the statutory base rate is 6%. The higher rate depends on prevailing wage and apprenticeship compliance or an applicable exception, including a facility with maximum net output below 1 MW AC.

Does missing July 4, 2026 eliminate the solar ITC?

No, missing that construction-start date does not automatically eliminate the credit. Solar facilities beginning construction afterward generally must be placed in service by December 31, 2027. Earlier starts need valid commencement evidence and continuity, alongside other eligibility requirements.

Can solar ITC bonus credits reach 70%?

A qualifying project can mathematically reach 70% by combining 30% with 10-point domestic-content and energy-community bonuses and a 20-point low-income allocation. Each condition is separate. The low-income program requires an allocation and a facility below 5 MW, so this is not a general commercial rate.

Are domestic content and prohibited foreign entity rules the same?

No, domestic-content bonuses and prohibited foreign entity restrictions use different legal tests. Domestic assembly or a supplier address alone cannot settle either question. Have the project tax adviser review the applicable sourcing calculations and supplier evidence.

Is bonus depreciation only 20% in 2026?

No, a universal 20% assumption is outdated. IRS Publication 946 describes restored 100% bonus depreciation for certain qualified property acquired and placed in service after January 19, 2025. Acquisition facts, property classification, elections and tax limitations still determine the project result.

Can a nonprofit receive a solar tax credit payment?

An eligible nonprofit may use elective pay for an eligible solar investment. Registration, filing, ownership and domestic-content rules still apply. Treat expected payment timing and eligibility as items for the organization’s tax adviser to approve before financing closes.