How Does Solar Depreciation Work for High Earners in 2026?

Solar depreciation lets you deduct the cost of a solar energy system over its IRS-defined recovery period, and the schedule is far more favorable than most real estate deductions. For investors in the top federal bracket, every dollar of depreciable basis can reduce taxable income at the highest marginal rate, making it one of the few remaining tools that generates large, front-loaded ordinary income deductions.

How does the MACRS schedule apply to solar property?

The IRS classifies solar energy property as 5-year property under asset class 00.3 of the Modified Accelerated Cost Recovery System (MACRS). That is dramatically shorter than the 27.5-year schedule for residential rental property or the 39-year schedule for commercial real estate. The half-year convention spreads the deductions across six calendar years:

• Year 1: 20.00%
• Year 2: 32.00%
• Year 3: 19.20%
• Year 4: 11.52%
• Year 5: 11.52%
• Year 6: 5.76%

The front-loading matters because deductions taken early deliver a higher present-value benefit than the same deductions taken years later. IRS Publication 946 covers MACRS classifications and recovery periods in full detail.

What is the correct depreciable basis after the ITC?

This is where many investors make a costly mistake. Under IRC Section 50(c), you must reduce your depreciable basis by 50% of the Investment Tax Credit claimed, not the full credit amount.

For a $1,000,000 commercial solar installation that qualifies for a 30% ITC, the math works like this:

• ITC claimed: $300,000
• Basis reduction: 50% x $300,000 = $150,000
• Adjusted depreciable basis: $850,000

Depreciating the full $1,000,000 without this adjustment can trigger recapture, back taxes, interest and penalties on audit. Always start with the adjusted basis.

A note on the ITC in 2026: The residential clean energy credit under Section 25D ended for property placed in service after December 31, 2025. Homeowners installing solar in 2026 cannot claim it. The commercial credit framework under Sections 48E and 45Y remains available for qualifying facilities, with construction start date and placed-in-service rules that depend on when your project began. See our post on commercial solar credits for high earners for more detail on the commercial side.

How does bonus depreciation change the Year 1 calculation?

Bonus depreciation is now a permanent 100% deduction for qualified property acquired after January 19, 2025. That is a significant change from the phase-down schedule described in the old version of this post, which cited 20% for 2026. Under current law, qualified solar property placed in service in 2026 may be eligible for 100% first-year expensing, though taxpayers may elect a lower rate if that produces a better outcome for their situation.

Using the $850,000 adjusted basis example with 100% bonus depreciation, the entire basis could be deducted in Year 1, subject to at-risk and passive activity rules discussed below. That is a very different result than the phased MACRS schedule alone.

Investors who face AMT exposure or who want to spread deductions across multiple years can elect out of bonus depreciation on a class-by-class basis on Form 4562. Electing out means the MACRS schedule above applies instead, which may keep taxable income in a more predictable range across years.

Can you actually use these deductions against your W-2 or business income?

This is the critical planning question. Solar depreciation losses are passive by default under IRC Section 469 if you are a passive investor. Passive losses can only offset passive income, not W-2 wages or active business income. Losses that cannot be used in the current year are suspended and carry forward until you have passive income or dispose of the asset.

The primary exception is Real Estate Professional (REP) status. To qualify, you must spend more than 750 hours per year in real property trades or businesses, and those activities must represent more than 50% of your total personal services. Investors who qualify and can also demonstrate material participation in the solar activity may be able to treat the losses as active, making them deductible against any income source in the current year.

For investors who do not qualify as real estate professionals, the deductions are not lost, they are simply deferred. Understanding your passive activity profile before you invest determines whether solar depreciation delivers immediate tax relief or future benefit. Our post on how material participation works for short-term rentals covers the participation rules in more depth.

What other strategies can increase the deduction?

Cost segregation. A qualified engineering firm can analyze a commercial solar installation at the component level, separating racking systems, inverters, wiring, monitoring equipment and disconnects that may qualify for shorter recovery periods than the standard 5-year MACRS classification. For installations of $500,000 or more, the cost of the study is typically recovered many times over through accelerated deductions. See our post on cost seg benefits for rental property owners for a look at how component-level analysis works.

Section 179 expensing. For qualifying solar property, Section 179 allows immediate expensing up to $2,560,000 in 2026, with a phase-out beginning once total qualifying property placed in service exceeds $4,090,000. Unlike bonus depreciation, Section 179 cannot create a loss, it is limited to business taxable income. For investors with sufficient business income, it can be a powerful complement to the MACRS schedule. The IRS Section 179 guidance covers the current limits and eligibility rules.

Partnership special allocations. In an LLC taxed as a partnership, depreciation allocations do not have to match each partner's ownership percentage. Under IRC Section 704(b), special allocations of solar depreciation to higher-bracket investors are permissible, provided the allocation has substantial economic effect. This concentrates the deduction benefit among the partners who derive the most value from large ordinary income offsets.

Qualified Opportunity Zone projects. Solar installations in IRS-designated Qualified Opportunity Zones can layer QOZ tax benefits on top of depreciation. Capital gains invested through a Qualified Opportunity Fund into a qualifying solar project may be eligible for gain deferral and, depending on the holding period, partial or full gain exclusion, while the underlying solar depreciation continues to generate deductions on the adjusted basis.

What mistakes do investors most often make?

Our team sees several recurring errors in solar depreciation planning:

• Skipping the ITC basis adjustment. As described above, this is the most common and most expensive error.
• Ignoring the mid-quarter convention. If more than 40% of your total depreciable property is placed in service in Q4, the mid-quarter convention applies instead of the half-year convention, which changes your Year 1 percentage.
• Assuming passive losses reduce current-year taxes. Without a path to use them, suspended losses do not reduce your bill this year.
• Overlooking state conformity. Some states do not conform to federal bonus depreciation rules. California, for example, has historically decoupled from federal accelerated depreciation. Always model state treatment separately.
• Ignoring depreciation recapture on sale. When a solar asset is sold, accumulated depreciation is subject to recapture under Section 1245 as ordinary income, not capital gain. That recapture must be modeled into the investment's total return from day one. Our post on depreciation recapture walks through how that calculation works.

Solar depreciation planning involves MACRS elections, bonus depreciation decisions, passive activity analysis, state conformity review and Form 4562 preparation. Each of those pieces interacts with the others, and the right answer depends on your full income picture for the year.