Depreciate Solar Panels on a Rental Property (2026)
Solar panels on a rental property don't ride along with the building's 27.5-year depreciation schedule, and treating them that way is the single most common mistake owners make when they add solar to an Airbnb, VRBO, or long-term rental. Classify the panels correctly and most of the cost comes off your taxes in the first year the system goes live.
- Solar panels on a rental property depreciate over 5 years under MACRS, not the building's 27.5-year schedule.
- 100% bonus depreciation applies to solar panels placed in service after January 19, 2025 under OBBBA.
- An engineering-based cost segregation study separates solar costs from the building basis and documents the deduction for your CPA.
- Claiming a federal energy credit on the panels? Reduce your depreciable basis by half the credit amount first.
- Skip the paperwork and the panels default to 27.5-year property, cutting your first-year deduction by thousands.
Why This Matters
A rental building depreciates over 27.5 years. Solar equipment does not. The IRS treats qualified solar energy property as 5-year MACRS property, the same recovery class used for a lot of the interior components an engineering-based cost segregation study pulls out of a residential rental.
That five-year classification, combined with 100% bonus depreciation for equipment placed in service after January 19, 2025 under the One Big Beautiful Bill Act, means an owner who installs a $20,000 solar array on a short-term rental in 2026 can potentially deduct the full cost that same tax year, not spread it out.
Get the classification wrong and the panels get lumped into the building's basis by default. That single filing error can cost a 37% bracket investor thousands of dollars in deductions they never claimed.
What You'll Need
- The solar installation invoice showing the itemized equipment and labor cost
- The property's placed-in-service (PIS) date and the panel system's own PIS date, if installed after the property was already a rental
- Documentation of any federal energy credit claimed on the system
- IRS Form 4562 for the depreciation election
- A CPA who will apply the study to the return
- An engineering-based cost segregation study or a documented cost allocation for the solar equipment
The Steps
1. Confirm the panels are on a qualifying rental, not a personal residence
Depreciation only applies to property used in a trade or business or held for the production of income. A solar system on a short-term rental, VRBO, or long-term residential rental qualifies. Panels on the roof of a primary residence generally do not get depreciated at all, they may instead qualify for a personal residential energy credit under separate rules. Mixed personal and rental use requires allocating the system's basis by rental-use percentage before you depreciate anything.
2. Lock down the placed-in-service date
The PIS date is the date the solar system is installed, inspected, and capable of generating power, not the date you paid the invoice. This date determines which bonus depreciation rate applies. Systems placed in service after January 19, 2025 qualify for 100% bonus depreciation under OBBBA. Systems placed in service earlier fall under the older phase-down schedule.
Common mistake: using the purchase date on the invoice instead of the interconnection or permission-to-operate date from the utility. The IRS looks at when the asset was ready and available for use.
3. Establish the correct depreciable basis
Start with the total installed cost of the system, including panels, inverters, mounting hardware, and labor. If you claimed a federal energy credit on the system, you generally must reduce the depreciable basis by half the credit amount before you calculate depreciation. Skipping this step overstates your deduction and creates a mismatch an IRS examiner will catch during an audit.
4. Classify the system as 5-year MACRS property
Solar electric generation equipment is classified as 5-year property under IRC Section 168, separate from the building's 27.5-year residential real property class. This is the classification step where most DIY depreciation schedules go wrong: without a documented cost allocation, tax software and generic depreciation worksheets will often default the entire property, including the solar system, to the 27.5-year schedule. An engineering-based cost segregation study documents which components qualify for shorter recovery periods, including solar, and produces the cost basis an examiner expects to see.
5. Apply bonus depreciation
Once the solar system is classified as 5-year property, it becomes eligible for bonus depreciation under Section 168(k). For 2026, that rate is 100% for property acquired and placed in service after January 19, 2025 under OBBBA's restored bonus depreciation rules. A $20,000 system placed in service in 2026 can generate a $20,000 first-year deduction against rental income, before any building depreciation is even calculated.
Expected outcome: the full solar basis, net of any credit-related reduction, hits Form 4562 as a current-year deduction instead of trickling out over five years.
6. Order the study before you file
A solar array installed alongside a short-term rental purchase or renovation is exactly the kind of asset an engineering-based study is built to catch. The study documents quantities, costs, and IRS-recognized classification methods for every component, solar included, so your CPA has a defensible number instead of an estimate. A typical flat-fee study runs $2,200 and takes 3 to 5 business days, with no site visit required for most residential rentals.
Get Your Solar System Classified Correctly
Flat-fee, engineering-based cost segregation studies for residential rentals.
7. Hand the report to your CPA and file Form 4562
The study is not filed with the IRS directly. Your CPA uses the documented cost allocations, including the solar system's 5-year basis and bonus depreciation amount, to complete Form 4562 and attach it to your return. If the property was purchased in a prior year and the solar system was never separately depreciated, your CPA may need to file Form 3115 to catch up the missed deduction rather than amending prior returns.
Troubleshooting
The system was installed before January 19, 2025. Bonus depreciation for property placed in service before that date follows the older phase-down schedule rather than the 100% OBBBA rate. Confirm the exact PIS date before assuming 100% applies.
The property has mixed personal and rental use. Only the rental-use percentage of the solar system's basis is depreciable. A vacation home rented 60% of the year only depreciates 60% of the solar system's cost.
The panels are leased, not owned. Leased solar equipment belongs to the leasing company, not the property owner, and the owner cannot depreciate an asset they don't own. Check the agreement before assuming the system is eligible.
No itemized cost breakdown exists. If the solar installation was bundled into a larger renovation invoice without a separate line item, a cost segregation study using engineering-based methods rather than rule-of-thumb allocation reconstructs the cost using accepted valuation techniques.
The property sells before the recovery period ends. Depreciation recapture applies to the accelerated deductions taken on the solar system, similar to recapture on any other reclassified asset. Factor this into your exit math before you sell.
Tools and Resources
- The solar installer's itemized invoice, kept with your permanent tax records
- IRS Form 4562 and its instructions for the current tax year
- An engineering-based cost segregation study covering the full property, not just the solar system
- A CPA familiar with Section 168(k) bonus depreciation and residential rental property
What to Do Next
If the solar system was added after your original cost segregation study, or if you never had a study done at all, get the property's full component breakdown documented before your CPA files this year's return. The panels are one asset class among dozens on a typical short-term rental, and separating all of them at once is more efficient than doing it piecemeal.
FAQ
Can you depreciate solar panels on a rental property?
Yes, solar panels on a rental property are depreciated as 5-year MACRS property, separate from the building's 27.5-year residential real property schedule. The system must be used in a rental or business activity, not a personal residence, to qualify.
How many years do you depreciate solar panels on a rental?
Solar electric generation equipment is classified as 5-year property under IRC Section 168. Most owners use bonus depreciation to deduct the full basis in year one instead of spreading it over the 5-year schedule.
Is solar panel depreciation 100% bonus in 2026?
Solar systems placed in service after January 19, 2025 qualify for 100% bonus depreciation under the One Big Beautiful Bill Act. Systems placed in service earlier follow the prior phase-down rates.
Do you reduce basis for the solar tax credit before depreciating?
Yes, if a federal energy credit was claimed on the solar system, the depreciable basis is generally reduced by half the credit amount before depreciation is calculated. Skipping this step overstates the deduction.
Can a cost segregation study include solar panels?
An engineering-based cost segregation study documents the solar system's cost and classification alongside other short-life components on the property. This gives a CPA a defensible basis instead of a rough estimate for Form 4562.
What IRS form is used to depreciate solar panels on a rental?
Form 4562 is used to elect and report depreciation, including bonus depreciation, on the solar system's basis. A property owner who missed depreciating solar in a prior year may need Form 3115 to catch up the deduction.
Does a short-term rental depreciate solar panels differently than a long-term rental?
The 5-year MACRS classification and bonus depreciation rules apply the same way to both. The difference shows up in how the owner uses the overall depreciation, since active short-term rental owners can use losses to offset W-2 income under the STR loophole.
What happens to solar depreciation if I sell the rental?
Depreciation recapture applies to the accelerated deductions taken on the solar system, taxed separately from the sale of the building itself. Run the recapture math before finalizing a sale price.
One Last Thing
Most owners who add solar to a short-term rental never separate the system's cost from the rest of the property, so the panels quietly ride the 27.5-year schedule for the life of the asset. Fixing that after the fact usually means a Form 3115 catch-up adjustment, not an amended return, and it can recover multiple years of missed deductions in a single filing season.