Treat tax eligibility as a separate review
Federal law changed in July 2025. A solar quote or a product’s ability to generate electricity does not establish tax eligibility. Ownership, project timing, the applicable credit and the taxpayer’s circumstances all need review. This page summarizes the deadlines supplied for this guide, not every condition of the law or the administrative guidance that may apply.
Keep the financial decision separate from the equipment decision. A system can be appropriate for a roof even where a federal credit is unavailable. Equally, an available program does not make an unsuitable roof suitable. Ask a tax professional to evaluate the project, and ask the installer and engineer to evaluate the building and system. ArcEdge supplies and supports solar systems; it does not provide tax advice.
Residential: the 25D deadline
The Section 25D residential clean energy credit ended for expenditures after December 31, 2025. A homeowner planning a project in October 2026 should not budget on the assumption that the former residential credit remains available for new expenditures. Do not reuse an older savings estimate without checking which rules it assumed.
How expenditures and project dates are treated is a question for a tax professional using current guidance. This page does not determine eligibility for a prior project or advise on filing a return. Keep invoices and project records so that the adviser can assess the facts. Do not assume paying a deposit or selecting equipment establishes a particular tax treatment.
Commercial: the 48E timing conditions
For solar, the Section 48E clean electricity investment credit is available only for projects that began construction by July 4, 2026, or that are placed in service by the end of 2027. These are alternative timing conditions, not a statement that every project meeting a date qualifies. Other eligibility requirements still apply.
Beginning construction and being placed in service have tax meanings that must be evaluated using current guidance. A planning meeting, purchase order or anticipated completion date should not be treated as proof on its own. Ask the adviser which records establish the project’s timing and what happens if the schedule changes. Commercial ownership does not automatically guarantee that a credit can be claimed.
Foreign-content restrictions
Additional foreign-content restrictions apply. Those restrictions need a project-specific review of the equipment, supply chain and applicable rules. A general country-of-design or manufacturing statement is not enough to determine credit eligibility. This page makes no claim that any ArcEdge product satisfies the requirements for a particular tax credit.
Before assuming a commercial credit in the budget, ask the adviser what documentation is needed from the equipment suppliers and project team. Confirm whether the current rules affect eligibility and how they apply to the planned expenditure and service dates. Do not substitute a marketing description or an older project’s tax treatment for that review.
State, utility and local programs
State, utility and local incentives vary widely, as do net metering and billing rules. The DSIRE database is a useful starting point for finding programs in the project’s location. Follow its links to the responsible program administrator and verify the current terms, available funding and application sequence. A database entry is not a guarantee that a particular project is eligible.
Commercial depreciation may also affect project economics, but its treatment depends on the taxpayer and current rules. Utility export credit and electricity charges can matter even without a tax incentive. Build a financial model using the actual tariff and realistic generation assumptions. Have the tax professional review incentive and depreciation assumptions before relying on the model to commit to a project.
Frequently asked questions
Is the old residential credit available for new 2026 expenditures?
The 25D credit ended for expenditures after December 31, 2025. Confirm your own situation with a tax professional.
Are the 48E dates enough to guarantee eligibility?
No. The timing conditions and additional requirements, including foreign-content restrictions, require professional review.
Where can I look for local programs?
Start with DSIRE at dsireusa.org, then confirm the rules with the relevant program administrator and utility.