New IRS Rule Doubles Solar Depreciation for Businesses

November 29, 2025
4 min read
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Fist Solar - Solar Energy & Home Efficiency

New IRS Rule Doubles Solar Depreciation for Businesses

A recent Internal Revenue Service rule alters the financial landscape for commercial solar projects by permitting businesses to double their depreciation deductions on eligible systems. This adjustment enables companies to recover costs from solar equipment more rapidly, providing a substantial incentive for installing renewable energy solutions on commercial properties.

The rule covers various installations, such as rooftop arrays, ground-mounted arrays, and solar systems combined with energy storage. Analysts predict this development will attract more commercial entities by enhancing cash flow and shortening payback periods.

Understanding the Depreciation Adjustment

The updated guidance allows businesses to claim a greater portion of solar equipment costs in the first year of operation. Traditional depreciation timelines, which spread deductions over multiple years, now permit accelerated recovery that effectively doubles the initial deduction amount.

This builds upon the Modified Accelerated Cost Recovery System, or MACRS, already in place for renewable energy assets. Under the new provisions, the depreciable basis percentage claimed upfront increases significantly, leading to reduced taxable income and better short-term financial outcomes for project owners.

Tax experts in clean energy financing view this as a practical enhancement. Organizations gain improved tools to handle initial expenses and elevate internal rates of return, independent of other subsidies.

The Role of Depreciation in Solar Economics

Depreciation serves as a fundamental element in making commercial solar viable. Quicker capital recovery lowers the net investment cost, particularly when paired with federal tax credits, utility rebates, and power purchase agreements.

Consider a manufacturing company deploying rooftop solar: the enhanced deduction permits immediate write-off of a larger system cost share. This accelerates payback timelines and aids in securing budget approvals by minimizing long-term capital commitments.

Property owners involved in leased solar arrangements or community solar initiatives also gain advantages. The faster deductions strengthen third-party ownership structures, enabling developers to finalize agreements with greater efficiency and grow their portfolios.

Perspectives from Industry Leaders

Trade organizations praise the rule for aligning with national priorities in renewable energy and manufacturing support. The Solar Energy Industries Association notes its role in bolstering investment while fostering domestic production.

Tax specialists highlight the simplification of bonus depreciation calculations alongside tax credits. This clarity equips financial modelers with reliable parameters for projections.

Sarah Kim, a senior tax partner at an energy advisory firm, observes that the adjustment will expedite project approvals. "When companies can capture a larger deduction sooner, projects move through approval stages faster," she states. "That helps both system owners and installers maintain momentum in the commercial market."

Opportunities for Developers and Installers

Developers can leverage this rule in client pitches across industries like retail, manufacturing, logistics, and real estate. The bolstered depreciation improves return demonstrations, making solar more compelling.

Installers anticipate incentives for scaling up systems or reviving borderline sites. Revised financial projections now reach breakeven sooner, influencing choices on array sizes and storage additions.

Commercial property managers assessing solar should engage tax professionals to verify qualifications and structure deals optimally. Applicability depends on ownership types, funding methods, and local tax considerations.

Alignment with National Energy Trends

This depreciation update supports ongoing federal and state initiatives to facilitate clean energy investments. Policymakers aim to reduce hurdles for private sector participation in sustainable infrastructure.

By enhancing upfront benefits, the IRS lowers entry barriers for commercial solar. Smaller enterprises, previously constrained by cash limitations, now face more accessible economics for on-site power generation.

Financing entities will monitor shifts in demand driven by this tax treatment. Projects with superior early returns pose reduced risks, potentially unlocking innovative funding streams and broader capital availability.

Steps to Leverage the Rule

Businesses eyeing solar installations should reassess project viability with the new deductions in mind. Update financial analyses to reflect accelerated depreciation and align timelines with tax filing requirements.

Collaborate with developers to customize financing and ownership models that maximize benefits. Early integration of these provisions can optimize tax outcomes and energy savings.

For installers and developers, prioritize client education on these advantages to streamline decisions. As solar expands commercially, mastering this IRS guidance ensures competitive positioning and sustained project success.

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