Solar Panel Depreciation Life: MACRS, Bonus, and Recapture

Solar panels used in a business or to produce income have a five-year depreciation life under the IRS Modified Accelerated Cost Recovery System (MACRS), no matter how long the panels physically last. For most systems placed in service in 2026, that five-year schedule is largely academic, because the One Big Beautiful Bill Act restored 100% first-year bonus depreciation for qualifying property placed in service after January 19, 2025.¹ The practical result: you write off the entire depreciable cost in year one, and the five-year classification mostly matters for recapture, basis math, and situations where bonus depreciation doesn’t apply.

What the Five-Year Classification Covers

Section 168(e)(3)(B) of the Internal Revenue Code assigns solar electric generating equipment a five-year cost recovery period.² Panels typically last 25 to 30 years in the field, but tax depreciation is not tied to useful life. Congress set the shorter recovery period as an incentive.

The five-year treatment applies to the full solar energy system: panels, inverters, wiring, and monitoring equipment. Energy storage (batteries) placed in service after December 31, 2024, also qualifies for five-year MACRS under the Inflation Reduction Act’s Provision 13703.² Solar-plus-storage installations follow the same schedule for both components.

Why Most Owners Deduct Everything in Year One

Bonus depreciation lets you deduct 100% of the depreciable cost of qualifying property in the year it’s placed in service. Under the One Big Beautiful Bill Act (Public Law 119-21), signed on July 4, 2025, that 100% rate is back for property placed in service after January 19, 2025.¹ Before the new law, the first-year percentage had already dropped to 60% in 2024 and was scheduled to fall to 20% in 2026.

A few features of bonus depreciation make it the default choice for solar:

It applies automatically. You have to affirmatively elect out of it if you don’t want it.
There’s no dollar cap.
It doesn’t require the business to have taxable income. A first-year loss from bonus depreciation can generate a net operating loss that carries forward.

Section 179 as an Alternative

Solar equipment also qualifies for the Section 179 deduction. For 2026, the maximum Section 179 deduction is $2,560,000, phasing out dollar-for-dollar once total qualifying property placed in service during the year exceeds $4,090,000.¹ The catch: Section 179 can only reduce taxable business income to zero. It can’t create a loss. If your business income is smaller than the cost of the solar system, bonus depreciation is usually the better vehicle because it has no income limitation.

Some taxpayers use Section 179 up to their taxable income limit and apply bonus depreciation to the rest. With 100% bonus depreciation on the table, that combination doesn’t add much for a solar-only investment, but it becomes relevant if the bonus percentage phases down again.

How the Investment Tax Credit Shrinks Your Depreciable Basis

If you claim the federal Investment Tax Credit on a solar system, you can’t depreciate the full purchase price. Section 50(c) of the Code requires you to reduce the depreciable basis by 50% of the credit amount.³ This is the rule most commonly missed in solar tax planning, and getting it wrong overstates the deduction.

For a $200,000 system with a 30% ITC:

ITC amount: $200,000 × 30% = $60,000 credit
Basis reduction: $60,000 × 50% = $30,000
Depreciable basis: $200,000 − $30,000 = $170,000 (85% of the original cost)

With 100% bonus depreciation, you’d deduct $170,000 in year one and receive the $60,000 credit on top of that. The Form 3468 instructions state the rule directly: “You must reduce the basis of energy property by 50% of the energy credit determined.”⁴

For systems placed in service after December 31, 2024, the applicable credit is the Section 48E Clean Electricity Investment Credit, which replaced the older Section 48 energy credit.⁵ The base rate is 6%, rising to 30% for projects meeting prevailing wage and apprenticeship requirements. The One Big Beautiful Bill Act tightened the timeline on Section 48E, and eligibility now depends on construction and placed-in-service dates. Verify current ITC availability before finalizing a 2026 tax plan.¹

The Placed-in-Service Date Controls the Year

Depreciation and the ITC both begin when the system is “placed in service,” which is not the day the panels go on the roof. The IRS considers property placed in service when it’s ready and available for its assigned function. For solar, five factors matter:

All required local, state, and utility permits and approvals have been obtained.
The installer has handed control of the system to the owner.
Critical performance tests have been completed.
The system is synchronized with the grid.
The system has begun regular power production.

No single factor is decisive, but a system that has passed final inspection and is generating power generally meets the standard. If your installation is wrapping up in late December, confirm every factor is satisfied before year-end. Miss one, and you slide into the following tax year for both depreciation and the credit.

The MACRS Schedule If Bonus Depreciation Doesn’t Apply

Elect out of bonus depreciation, or run into a future year where the bonus percentage has dropped, and the standard MACRS rules take over. Five-year property uses the 200% declining balance method, which front-loads deductions into the early years.

The half-year convention applies by default: property is treated as placed in service at the midpoint of the year, so only half a year’s depreciation is claimed in year one and the remaining half spills into year six. A five-year recovery period therefore spans six tax years on the schedule.⁶

Watch for the mid-quarter convention. If more than 40% of all depreciable property you place in service during the year lands in the final quarter (October through December), the half-year convention is replaced by mid-quarter. Since solar installations often close near year-end, this can shrink the first-year deduction on fourth-quarter systems.

Business Use Is Required

Depreciation is available only for solar systems used in a trade or business or to produce income. Systems on commercial buildings, warehouses, farms, and rental properties qualify. A system on your personal residence does not, and this isn’t a technicality you can plan around.

Homeowners who installed solar in 2022 through 2025 could claim the Residential Clean Energy Credit under Section 25D, worth 30% of the system’s cost.⁷ IRS guidance now states that this credit is not available for property placed in service after December 31, 2025, following changes made by the One Big Beautiful Bill Act.⁸

Mixed-use property gets split. If the business portion of a home occupies 15% of square footage, 15% of the solar system’s cost is eligible for depreciation and the remaining 85% is personal-use property. You can’t claim both depreciation and a personal credit on the same portion of the system.

Recapture When You Sell or Change Use

An aggressive first-year deduction isn’t free money. Two recapture rules can pull benefits back.

Section 1245 Depreciation Recapture

Solar panels are personal property for tax purposes, which puts them under Section 1245. If you later sell the system or the property it sits on at a gain, the portion of that gain attributable to depreciation you claimed is taxed as ordinary income rather than at long-term capital gains rates.⁹ On a $200,000 system where you deducted the full $170,000 basis through bonus depreciation, up to $170,000 of the eventual gain could hit at ordinary rates. That’s the trade-off for accelerated depreciation, and it surprises owners who sell the property a few years in.

ITC Recapture

The ITC has its own five-year vesting period. Dispose of the system or convert it to personal use before five full years have passed, and you owe back part of the credit on a sliding scale:¹⁰

Year 1: 100% recaptured
Year 2: 80% recaptured
Year 3: 60% recaptured
Year 4: 40% recaptured
Year 5: 20% recaptured
After five full years: no recapture

The recaptured amount is added directly to your tax for the year of disposition. Sell a system in year two after claiming a $60,000 credit, and you owe an additional $36,000. ITC recapture is reported on Form 4255.¹⁰

Where It Gets Reported

Depreciation is calculated on Form 4562, Depreciation and Amortization. Form 4562 is where you specify the five-year recovery period, elect out of bonus depreciation if you’re doing that, and make any Section 179 election.⁶ The total then flows to your business return: Schedule C for sole proprietors,¹¹ Schedule E for rental property owners,¹² Form 1120 for corporations, or Form 1065 for partnerships and multi-member LLCs.¹³

If you claim the ITC, file Form 3468 as well, and reflect the basis reduction on your Form 4562 schedule. The Form 3468 instructions require an accounting of basis in the energy property and a depreciation schedule showing remaining basis after the credit.⁴

Keep every document that supports depreciable basis and the placed-in-service date: installation contract, invoices, proof of payment, interconnection agreement, permits, and the installer’s certificate of completion. The Form 3468 instructions say records must be retained as long as their contents may become material to any tax matter.⁴ Given the five-year ITC recapture window, plan on holding the records at least seven years past the placed-in-service date.

1
Internal Revenue Service. One, Big, Beautiful Bill Provisions
2
Internal Revenue Service. Cost Recovery for Qualified Clean Energy Facilities, Property and Technology
3
Office of the Law Revision Counsel. 26 U.S. Code 50 – Other Special Rules
4
Internal Revenue Service. 2025 Instructions for Form 3468
5
National Archives. Section 45Y Clean Electricity Production Credit and Section 48E Clean Electricity Investment Credit
6
Internal Revenue Service. 2025 Instructions for Form 4562 – Depreciation and Amortization
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Internal Revenue Service. Residential Clean Energy Credit
8
Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
9
Office of the Law Revision Counsel. 26 U.S. Code 1245 – Gain from Dispositions of Certain Depreciable Property
10
Internal Revenue Service. Instructions for Form 4255 – Certain Credit Recapture, Excessive Payments, and Penalties
11
Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship)
12
Internal Revenue Service. Topic No. 414, Rental Income and Expenses
13
Internal Revenue Service. Instructions for Form 1120 (2025)