Commercial solar · 2026–2027

Commercial Solar Tax Credits in 2026–2027: Deadlines, 48E and What Businesses Need to Know

The homeowner solar credit ending did not automatically end commercial incentives. The harder question is whether a specific business project satisfies Section 48E, construction timing, placed-in-service, labor, sourcing and documentation rules.

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Commercial solar: the 2027 deadline matters

Commercial incentives did not end with the homeowner credit.

Residential Section 25D and commercial Section 48E are different provisions. Section 25D generally ended for expenditures after December 31, 2025. Commercial solar and storage may still qualify under Section 48E, but the construction and placed-in-service dates now matter.

July 4, 2026Construction cutoff

Projects that began construction on or before this date may avoid the special 2027 termination rule if they satisfy the IRS beginning-of-construction and continuity rules.

December 31, 2027Placed-in-service cutoff

For applicable solar projects that began construction after July 4, 2026, the facility generally must be placed in service by this date to remain eligible for 48E.

Beginning a project now?

Do not assume the credit is unavailable, and do not assume it is automatic. A post-July 4, 2026 solar project may still qualify if it is placed in service by December 31, 2027 and meets all other requirements. Storage is treated separately under the statute and requires project-specific review.

48E in plain English

What a business must verify

Potential credit percentage

The base 48E investment credit is 6%. It can reach 30% when the project qualifies for the five-times increased amount. A facility below 1 MW AC may qualify for that increased amount without independently satisfying prevailing-wage and apprenticeship requirements; larger projects generally must satisfy those labor rules or another exception.

Bonus scenarios

Domestic content can add 10 percentage points when the full-rate conditions are met. An energy-community location can add 10 percentage points. The allocated low-income program can add 10 or 20 percentage points for an eligible facility below 5 MW. These bonuses are not automatic and should not be stacked in a proposal without evidence.

Solar plus storage

Qualified energy-storage technology placed in service after 2024 may qualify independently under 48E. Battery capacity, ownership, tax basis, placed-in-service timing, foreign-entity sourcing restrictions and interaction with the solar facility require separate review.

Beginning construction

Signing a contract alone does not establish beginning of construction. Notice 2025-42 generally requires physical work of a significant nature. A limited 5% safe harbor remains for a low-output solar facility not greater than 1.5 MW AC, subject to the notice and continuity requirements.

Placed in service

Generally, property is placed in service when it is ready and available for its specifically assigned function. Contract signing, permitting, equipment delivery or substantial completion may not by themselves establish this tax date.

Transfer, direct pay and depreciation

Eligible taxpayers may transfer a 48E credit for cash. Certain tax-exempt and governmental entities may use elective pay after pre-filing registration. Qualifying property may receive five-year MACRS treatment and may be eligible for bonus depreciation, but depreciation is separate from the credit and is not transferred with it.

Foreign-entity restrictions

Projects beginning construction after December 31, 2025 can lose eligibility if prohibited-foreign-entity status or material-assistance rules apply. Equipment sourcing now needs tax diligence, certifications and records, not a generic “domestic panel” statement.

No guarantee

Eligibility depends on the taxpayer, ownership, basis, technology, construction facts, labor compliance, sourcing, location, placed-in-service date, elections and filings. Tower Solar does not provide tax, accounting or legal advice.

Illustrative examples, not quotes

How project scale changes the numbers

Examples assume rooftop pricing of $1.70–$2.30/W, 1,300 kWh/kW-year, $0.15/kWh energy value and a potential 30% 48E scenario. Actual tariffs, demand charges, tax basis, bonuses and financing can materially change results.

100 kW rooftop

Project cost: $170k–$230k
Potential federal credit: $51k–$69k
Estimated net cost: $119k–$161k
Annual savings: $19,500
Simple payback: 6.1–8.3 years

250 kW rooftop

Project cost: $425k–$575k
Potential federal credit: $128k–$173k
Estimated net cost: $298k–$403k
Annual savings: $48,750
Simple payback: 6.1–8.3 years

500 kW rooftop

Project cost: $850k–$1.15M
Potential federal credit: $255k–$345k
Estimated net cost: $595k–$805k
Annual savings: $97,500
Simple payback: 6.1–8.3 years

1 MW

Project cost: $1.7M–$2.3M
Potential federal credit: $510k–$690k
Estimated net cost: $1.19M–$1.61M
Annual savings: $195,000
Simple payback: 6.1–8.3 years

Solar + battery

Project cost: Project-specific
Potential federal credit: Potentially separate 48E basis
Estimated net cost: Project-specific
Annual savings: Tariff-dependent
Simple payback: Model required

Pennsylvania · New Jersey · Florida

State and utility value must be modeled separately

Pennsylvania

Commercial projects may create Pennsylvania alternative-energy credits under AEPS, may qualify for utility-specific net metering and interconnection, and may have access to C-PACE or other financing in participating jurisdictions. Program availability and value are not guaranteed.

Pennsylvania solar guide PA forms and utility applications

New Jersey

Net-metered nonresidential projects up to 5 MW may fit the ADI side of SuSI; larger nonresidential and grid-supply projects may use competitive CSI solicitations. SREC-II values, registration timing, capacity blocks and storage treatment must be confirmed before modeling revenue.

New Jersey incentives guide NJ forms and utility applications

Florida

Qualifying solar-energy systems may receive state sales-tax treatment, while net metering and interconnection remain utility-specific. FPL, Duke Energy Florida, Tampa Electric, municipal utilities and cooperatives do not use one universal application or tariff.

Florida solar guide Florida forms and utility applications

Educational commercial estimate

Test a preliminary project

Business/property address Monthly electric bill ($) Annual electricity use (kWh, optional) Utility rate ($/kWh) Installation type Known project size (kW, optional) State Battery interest Project structure Potential credit scenario

No information is submitted when you run this estimate.

Illustrative results

100 kW preliminary system

Annual generation125,000 kWh

Project cost range$170,000–$230,000

Potential 48E scenario$51,000–$69,000

Estimated net cost$119,000–$161,000

Annual electricity savings$18,750

Simple payback6.3–8.6 years

$187,50010-year gross savings$375,00020-year gross savings$468,75025-year gross savings

Assumes 1,250 kWh per kW-year, $1.70–$2.30/W rooftop cost and no financing, maintenance, demand-charge, degradation, tax or incentive-allocation adjustment.

This is not a quote or tax-credit determination. Bonus credits require separate eligibility evidence.

No-obligation review

Request a Commercial Solar Feasibility Review

Share the basic property and energy information. Submitting this form does not obligate the business to purchase solar.

Electric-bill upload is not enabled because the current lead system does not provide secure document storage. Tower Solar can request a redacted bill after the initial review.

Commercial solar FAQ

Questions to resolve before committing capital

Does commercial solar still qualify for a federal incentive?

Potentially. Section 48E remains available for qualifying clean-electricity facilities and storage, but solar projects beginning after July 4, 2026 generally must be placed in service by December 31, 2027 and satisfy all other requirements.

Does signing a contract count as beginning construction?

No, not by itself. Notice 2025-42 generally looks for physical work of a significant nature. A limited 5% safe harbor can apply to certain solar facilities not greater than 1.5 MW AC.

What if construction begins after July 4, 2026?

The project may still qualify if it is placed in service by December 31, 2027 and satisfies every other requirement. That schedule should be tested against permitting, interconnection, equipment and construction risk.

Can a battery qualify without solar?

Potentially. Section 48E can apply to qualified energy-storage technology placed in service after 2024, subject to its own basis, ownership, sourcing and other requirements.

Is the 30% amount automatic?

No. The base rate is 6%. The increased amount can be 30% when labor rules or a qualifying exception applies. Bonus amounts require separate proof or allocation.

What does placed in service mean?

Generally, the property must be ready and available for its specifically assigned function. It is not automatically the contract, permit, delivery or payment date.

Does Tower Solar give tax advice?

No. Tower Solar provides educational estimates and project-development support. A qualified tax professional and legal adviser should verify eligibility and documentation.

Primary government sources

Rules checked against current official guidance

Last verified October 6, 2026. Tax law and agency guidance can change. Confirm the project facts with qualified tax and legal advisers before relying on a credit.