Rental Property Tax Write-Offs to Review Before Year-End 2026
Year-end is when rental property tax write-offs either get captured or get left on the table for good. December 31 is a hard line: purchases, upgrades, and elections that miss the deadline wait a full year to matter on your return.
- Reviewing rental property tax write offs before year end can capture depreciation, repairs, and mileage deductions that expire on December 31.
- 100% bonus depreciation applies to residential rental property placed in service after January 19, 2025 under the OBBBA - buy or close before year end to use it.
- A cost segregation study commonly reclassifies 20-45% of a property's value into 5, 7, or 15-year assets, accelerating depreciation you'd otherwise wait decades for.
- Repairs completed and paid for in 2026 deduct in 2026; work started but not finished waits until next year.
- Short-term rental owners tracking material participation hours need those logs finalized before year end, not reconstructed in April.
Why this matters
Most rental owners treat tax planning as a spring activity, handled after the year already closed. By April, the deductions available to you are whatever already happened in the prior 12 months. There's no going back to add a cost segregation study to a property you placed in service ten months ago and expect the full first-year benefit if you never scheduled it.
The One Big Beautiful Bill Act (OBBBA) restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025. That single change means every 5, 7, and 15-year asset a cost segregation study identifies can be deducted in full in year one, instead of phasing in at 40% or 60% under the older schedule. If you're a high W-2 earner using the short-term rental loophole to offset active income, timing that reclassification before December 31 changes what you owe on this year's return, not next year's.
What you'll need
- Closing statement or settlement documents for any property purchased in 2026
- Receipts and invoices for repairs, renovations, or furnishing purchases made this year
- A log of days rented and personal-use days for any short-term rental
- Material participation hour logs if you're using the STR loophole against W-2 income
- Prior-year depreciation schedule from your CPA or tax software
- A cost segregation study if you haven't ordered one for a property acquired or renovated this year
The steps
1. Pull your full list of 2026 property activity
Start with every residential rental property you owned or acquired during 2026, including partial-year ownership. This accomplishes one thing: it stops you from missing a property that closed in March and never made it onto your CPA's radar for planning purposes.
List the closing date, purchase price, and any renovation dollars spent post-closing. Properties placed in service after January 19, 2025 qualify for 100% bonus depreciation under OBBBA, so the placed-in-service date on each property matters more than the purchase date alone.
Common mistake: treating "purchased" and "placed in service" as the same date. A property bought in August but not rent-ready until October has an October placed-in-service date, which is what depreciation calculations actually use.
2. Separate repairs from improvements
Repairs (a water heater replacement, a patched roof section) deduct in full the year you pay for them. Improvements (a new roof, a full kitchen remodel) get capitalized and depreciated over time, unless a cost segregation study reclassifies pieces of that improvement into shorter recovery periods.
Go through every invoice from 2026 and flag which bucket each expense falls into. This single sorting exercise is where a lot of owners either overstate current-year deductions or miss ones they're entitled to.
Common mistake: capitalizing something that actually qualifies as a repair under the de minimis safe harbor, which caps out at $2,500 per item for taxpayers without an applicable financial statement.
3. Decide if a cost segregation study makes sense this year
If you acquired, built, or substantially renovated a residential rental in 2026, a study is worth running before you file. An engineering-based study typically reclassifies 20-45% of a property's depreciable basis into 5, 7, and 15-year categories instead of the standard 27.5-year residential schedule.
Run the numbers: on a $500,000 rental with 25% of value reclassified, that's roughly $125,000 moved into short-life assets. At 100% bonus depreciation, that entire $125,000 becomes a first-year deduction. For an investor in the 37% bracket, that's around $46,000 off this year's tax bill, assuming sufficient passive income or STR loophole qualification to use it.
Check the first-year cost segregation checklist before you order, so you have documents ready and don't lose days to back-and-forth.
Common mistake: waiting until January to order a study for a property placed in service in 2026, assuming it can still apply to this year's return. It can, through an amended return or Form 3115, but that's a heavier lift than getting it done before you file.
4. Confirm your bonus depreciation percentage
Bonus depreciation is not one flat number across every year. Property placed in service after January 19, 2025 gets 100% under OBBBA. Property placed in service earlier in 2025, before that date, may fall under the prior phase-down schedule. Get this date right before you assume a deduction size.
Read through the details on 100% bonus depreciation for 2026 cost segregation if your placed-in-service date is close to the cutoff, since a few weeks either direction changes the math meaningfully.
Common mistake: applying 100% bonus depreciation to a property placed in service in early 2025 without checking which side of January 19 it lands on.
5. Finalize your STR loophole documentation
If you're using the short-term rental loophole to offset W-2 income, the IRS wants two things: average stay under seven days (or under 30 with substantial services) and material participation, usually more than 100 hours and more than any other individual involved with the property. Both need contemporaneous logs, not a reconstruction in April.
Before December 31, total your hours for the year. If you're short of the 100-hour threshold, you may still have time to log qualifying activities like guest communication, cleaning coordination, or maintenance calls before the calendar closes.
Common mistake: logging hours after the fact from memory. Examiners look for contemporaneous records, and a reconstructed log built in tax season carries much less weight.
6. Check mileage and home office deductions
If you drive to your rental for maintenance, showings, or guest turnover, those miles are deductible at the current IRS standard mileage rate. Pull your mileage log now while the year's trips are still fresh, rather than trying to rebuild a year of driving from memory.
If you manage the property from a dedicated home office space, confirm the square footage and exclusive-use requirement are still accurate for 2026 before you claim the deduction again.
Common mistake: assuming mileage to and from a personal residence you also rent out short-term counts the same as mileage to a separate investment property. The personal-use days on that property change how those miles get treated.
7. Review land improvements and furnishings separately
Driveways, landscaping, fencing, and outdoor lighting depreciate on a 15-year schedule when identified separately from the building itself. Furniture and appliances for a furnished short-term rental typically fall into 5 or 7-year categories.
See how to depreciate land improvements after cost segregation for the specific categories examiners expect documented separately from the building's basis.
Common mistake: lumping land improvements into the building's 27.5-year depreciation schedule instead of breaking them out, which leaves years of accelerated deductions unclaimed.
Troubleshooting
Problem: You closed on a property in December and can't get a study done before year-end filing. A study can still apply to the 2026 tax year even if it's completed in January, as long as the property was placed in service in 2026. Turnaround on a flat-fee engineering-based study is typically 3-5 business days once documents are in, so there's often more runway than owners assume.
Problem: Your material participation hours are under 100. Look for STR-related tasks you may have skipped logging, like coordinating with a cleaner, sourcing replacement furnishings, or handling guest issues remotely. If you genuinely fall short, the loophole may not apply this year, and that's worth confirming with your CPA before you assume a deduction that isn't there.
Problem: You're not sure if a $2,500 repair should be capitalized. The de minimis safe harbor generally allows expensing items under that threshold per invoice or item, but consistency with your prior elections matters. Flag it for your CPA rather than guessing.
Problem: You inherited or converted a personal residence to a rental mid-year. Your depreciable basis usually starts at the lower of your adjusted basis or fair market value on the conversion date, not your original purchase price.
Problem: You own the property through an LLC with partners. Reclassified depreciation from a cost segregation study needs to be allocated according to the partnership agreement, not split evenly by default.
Tools and resources
- Cost segregation checklist for first-year rental owners
- How much a cost segregation study costs
- Your 2026 closing statements and repair invoices, organized by property
- A mileage log app or spreadsheet updated through December
- Your CPA's current depreciation schedule for each property
Order your flat-fee study before year-end
$2,200 flat fee, 3-5 business day turnaround, no site visit required.
What to do next
Once your write-offs are sorted, the next document to get in front of your CPA is the study itself, if you've ordered one. Read through how the OBBBA changed bonus depreciation for rental property so your CPA has the full context on why this year's numbers look different from 2023 or 2024 filings.
FAQ
What rental property tax write offs should I review before year end?
Review repairs versus improvements, mileage logs, material participation hours for the STR loophole, and whether a cost segregation study makes sense for any property placed in service in 2026. Each has a December 31 cutoff that affects this year's return specifically.
Is bonus depreciation still 100% in 2026?
Yes, for residential rental property acquired and placed in service after January 19, 2025 under the One Big Beautiful Bill Act. Property placed in service before that date may fall under a different phase-down percentage.
How much does a cost segregation study cost?
A flat-fee engineering-based study for residential rental property runs $2,200 with no site visit required. Turnaround is typically 3-5 business days once your documents are submitted.
Can I still get a cost segregation study done before I file?
Yes, if your property was placed in service during 2026 and you submit documentation before your filing deadline. The 3-5 business day turnaround leaves room even for late-year closings.
What percentage of a rental property gets reclassified in a cost segregation study?
Studies commonly reclassify 20-45% of a property's depreciable basis into 5, 7, and 15-year asset categories. The exact percentage depends on the property's amenities, construction, and documentation.
Do I need 100 hours to qualify for the short-term rental loophole?
Material participation generally requires more than 100 hours and more time than any other individual involved with the property, alongside average guest stays under seven days. Contemporaneous logs matter more than the total hour count alone.
Are repairs deductible the same year I pay for them?
Yes, repairs are generally deductible in the year paid, while improvements get capitalized and depreciated over time. The distinction depends on whether the work restores versus betters or adapts the property.
What happens if I miss the December 31 deadline for a deduction?
Most write-offs tied to a specific tax year can't be added retroactively without an amended return or Form 3115 for missed depreciation. It's cleaner to capture what you can before the calendar year closes.
One last thing
The placed-in-service date, not the closing date, is what determines your bonus depreciation percentage under OBBBA. Two rentals closed a week apart in early 2025, one before January 19 and one after, can land on completely different depreciation schedules for the exact same type of property.