10 Factors That Increase Bonus Depreciation in 2026
Bonus depreciation dropped to 40% in 2025 for most property, then jumped back to 100% under the One Big Beautiful Bill Act for anything acquired and placed in service after January 19, 2025. But the percentage is only half the equation. The other half is how much of your property actually qualifies for that accelerated treatment in the first place, and that's where these ten factors come in.
- Placed-in-service date after January 19, 2025 is the single biggest factor increasing bonus depreciation rental property outcomes.
- Furnishings and outdoor amenities in short-term rentals often reclassify at 20-45% of purchase price.
- Engineering-based studies find more short-life assets than rule-of-thumb estimates, directly raising your bonus depreciation total.
- A $2,200 flat-fee study on a $400,000 property can still surface five-figure first-year deductions.
Why this matters
Two owners can buy the same $500,000 rental on the same day and end up with wildly different first-year deductions. One gets a cursory desktop review that reclassifies 10% of the property. The other gets an engineering-based study that identifies 30% because the reviewer actually itemized the pool deck, the furniture package, and the driveway.
The difference isn't luck. It's a set of concrete factors that either expand or shrink the pool of assets eligible for the 100% bonus depreciation rate in 2026. Know these ten and you'll know exactly what to check before, during, and after your study.
What you'll need
- Closing statement or settlement sheet showing purchase price and closing costs
- Itemized list of renovation, furnishing, or improvement spend since acquisition
- Placed-in-service date documentation (certificate of occupancy, first rental listing date, or lease start)
- Photos or a walkthrough video of the property, especially outdoor amenities
- Your CPA's contact information for handoff once the study is complete
The 10 factors
1. Placed-in-service date
This is the factor with the most leverage. Property acquired and placed in service after January 19, 2025 qualifies for 100% bonus depreciation under the OBBBA bonus depreciation rules, while property placed in service earlier in 2025 was stuck at 40%. If you closed in late 2025 but didn't list the rental until 2026, the placed-in-service date, not the closing date, is what your study and your CPA need to document.
Common mistake: using the closing date instead of the actual rental-ready date, which can understate eligible bonus depreciation.
2. Purchase price allocation between land and building
Land never depreciates, so an aggressive land allocation shrinks your entire depreciable base before cost segregation even starts. A property with a 20% land allocation instead of 30% gives an engineering-based study 10% more building value to work with.
Common mistake: using the county tax assessor's land ratio, which frequently overstates land value for STR-heavy markets.
3. Renovation and remodel spend
Kitchen remodels, bathroom updates, and flooring replacements after acquisition create a second layer of assets to classify. A $60,000 renovation on a short-term rental commonly reallocates 25-40% of that spend into 5- and 15-year property, on top of whatever the original purchase reclassifies.
Expected outcome: a larger, not smaller, bonus depreciation deduction the year renovations wrap.
4. Furnishings and personal property in short-term rentals
Furniture, appliances, decor, and electronics in an actively managed Airbnb or VRBO property are typically 5-year property, fully eligible for bonus depreciation. A fully furnished 3-bedroom short-term rental can carry $30,000-$60,000 in furnishings alone.
Common mistake: lumping furnishing costs into the building basis instead of itemizing them separately, which erases this entire category.
5. Pools, hot tubs, and outdoor amenities
Swimming pools, hot tubs, fire pits, and outdoor kitchens are frequent line items in how a cost segregation study classifies a swimming pool, and they carry real weight in STR markets where amenities drive nightly rate. Classification depends on the asset's function and documentation, not a blanket rule, so a study needs specifics on installation date and use.
Why it matters: amenity-heavy STRs in vacation markets often reclassify at the higher end of that 20-45% range.
6. Land improvements
Driveways, fencing, landscaping, irrigation, and exterior lighting sit outside the building structure and commonly qualify for 15-year recovery, which is bonus-eligible. These assets are easy to miss because they don't show up as a single line item on a closing statement.
Common mistake: skipping a site walkthrough or photo review, which means land improvements never get identified at all.
7. HVAC, electrical, and plumbing tied to specific assets
Not every HVAC unit is 27.5-year property. Equipment dedicated to a specific function, like a mini-split serving a detached guest suite, can shift into a shorter recovery class depending on how it's installed and documented. This is one of the more technical calls in a study, which is why engineering detail matters more than a percentage guess.
8. Engineering-based methodology versus a rule-of-thumb estimate
A rule-of-thumb estimate applies a flat percentage across every property type. An engineering-based study itemizes actual components, room by room, which is why two studies on the same property can produce very different reclassified totals. The gap between a 15% flat estimate and a documented 30% engineering result is the difference between a modest deduction and a five-figure one.
9. Timing the study before year-end
Ordering a study in November for a property placed in service that same year gives your CPA time to apply the deduction on the current-year return instead of amending later. Waiting until March of the following year doesn't kill the benefit, but it adds friction and can push the deduction into a less favorable filing sequence.
10. Coordinating the study with the STR loophole and material participation
Bonus depreciation only offsets W-2 income for active short-term rental owners who meet material participation tests. A larger reclassified percentage means nothing against your W-2 income if the material participation hours aren't documented. The two factors compound each other: more reclassified basis plus qualifying hours equals a real offset, not just a paper loss.
Troubleshooting
Your reclassified percentage came in lower than expected. Check whether furnishings, land improvements, and renovation spend were itemized separately from the building basis, or whether they got folded into one lump number.
Your CPA says the study can't be applied this year. Confirm the placed-in-service date and whether the return has already been filed. A missed year can often be caught up using a change in accounting method on Form 3115 rather than an amended return.
You're not sure if your renovation qualifies as new basis. Renovations completed and placed in service after your original purchase generally create their own depreciable basis, separate from the original acquisition. Document the completion date.
The property was purchased mid-year and you're unsure how bonus depreciation applies. The placed-in-service date, not the purchase date, controls eligibility, and a mid-year conversion has its own documentation requirements.
You bought the property before January 19, 2025. That property is generally stuck at the lower bonus rate that applied at the time, regardless of when the study is ordered. Confirm your specific placed-in-service date with your CPA before assuming otherwise.
Tools and resources
- Cost segregation study for Airbnb and short-term rentals for a full walkthrough of the process on an actively managed rental
- Placed-in-service date and 100% bonus depreciation to confirm which side of the January 19, 2025 line your property falls on
- A settlement statement, renovation invoices, and furnishing receipts, organized by date
- Your CPA, looped in before the study starts so the reclassified categories match how the return will be filed
Get your reclassified percentage estimated
A free manual estimate shows what your property could reclassify before you order a study.
What to do next
Run the math on your own property before you order anything. Pull your purchase price, your renovation and furnishing spend, and your placed-in-service date, then compare that against the 20-45% range most residential rental studies fall into. If the numbers point toward a meaningful deduction, an engineering-based study locks in the documentation your CPA needs to defend it.
FAQ
What increases bonus depreciation the most on a rental property?
The placed-in-service date matters most because property placed in service after January 19, 2025 qualifies for 100% bonus depreciation under the OBBBA, versus 40% for property placed in service earlier in 2025. After that, furnishings, renovations, and outdoor amenities on short-term rentals drive the reclassified percentage higher.
Do furnishings count toward bonus depreciation?
Furnishings in an actively managed short-term rental are typically classified as 5-year property, which makes them bonus-depreciation eligible. A fully furnished 3-bedroom STR can carry tens of thousands of dollars in furnishings alone, separate from the building itself.
Does a swimming pool qualify for bonus depreciation?
Classification depends on the pool's function, documentation, and placed-in-service date, so it is never automatic. A study needs installation records and usage details before assigning a recovery period.
Is bonus depreciation 100% in 2026?
Yes, for property acquired and placed in service after January 19, 2025, bonus depreciation is restored to 100% under the One Big Beautiful Bill Act. Property placed in service before that date follows the phase-down schedule that applied at the time.
How much does a cost segregation study cost?
A flat-fee engineering-based study for a residential rental typically runs $2,200 and takes 3-5 business days to complete. The fee doesn't change based on how much the study ends up reclassifying.
Can renovations increase bonus depreciation after the original purchase?
Yes, renovation and remodel spend completed after acquisition generally creates its own depreciable basis, separate from the original purchase. A $60,000 remodel often reallocates 25-40% of that spend into short-life property.
Does an engineering-based study find more bonus depreciation than a rule-of-thumb estimate?
Generally yes, because an engineering-based study itemizes actual components room by room instead of applying a flat percentage across the property. The gap between a 15% flat estimate and a documented 30% result can mean tens of thousands in additional first-year deductions.
Does the STR loophole affect how much bonus depreciation helps me?
The reclassified percentage only offsets W-2 income if you meet material participation requirements for the short-term rental. A high reclassified percentage without documented participation hours doesn't produce a usable offset against W-2 income.
One last thing
The factor owners overlook most isn't the pool or the furniture package, it's the land allocation on the closing statement. A property with an inflated land value can lose 10 percentage points of depreciable basis before a single asset gets classified, and that's basis no engineering study can recover later.