Bonus Depreciation in 2026: The 40% Phase Down and What It Means for Rental Investors
Bonus depreciation is the single largest tax lever for rental investors who run cost segregation studies, and it is phasing down on a fixed schedule. 2026 is the 40% year, 2027 drops to 20%, and 2028 hits zero unless Congress acts. If you are planning a purchase and a study, the math is meaningfully different depending on which tax year the property goes into service. This post walks through the current schedule, what qualifies, how it interacts with cost seg, and what 2027 and beyond look like. For the wider playbook, start with the cost segregation pillar.
The TCJA phase down schedule
The Tax Cuts and Jobs Act of 2017 temporarily bumped bonus depreciation to 100% for qualifying property placed in service from late 2017 through 2022. Starting in 2023, the bonus rate drops 20 percentage points per year on a predefined schedule.
- 2017 through 2022: 100% bonus
- 2023: 80% bonus
- 2024: 60% bonus
- 2025: 40% bonus
- 2026: 40% bonus (the phase down paused one year due to legislative changes in 2024)
- 2027: 20% bonus
- 2028: 0% bonus unless Congress extends
The 2026 rate holding at 40% was a minor legislative win for investors. The original schedule would have put us at 20% by now. The 2028 cliff is real and not currently expected to be extended under current fiscal projections, though the landscape could change.
For rental investors running cost seg, the phase down shifts the year one impact materially. A cost seg study that pulled $100K of year one depreciation in 2022 at 100% bonus would pull about $55K to $65K today at 40% bonus, because only 40% of the short life components qualify for the immediate deduction and the rest goes on their normal 5 or 15 year schedule.
The strategy still works. The magnitude is smaller.
What actually qualifies for bonus depreciation
Bonus depreciation applies to property with a recovery period of 20 years or less. For rental real estate, that means the components a cost seg study reclassifies into 5 year and 15 year buckets, not the 27.5 year residential building shell.
5 year property. Appliances, carpet, interior removable cabinets, window treatments, certain plumbing fixtures that serve tenant personal property needs, and the like. Roughly 20 to 30% of a typical residential rental basis falls into this bucket.
15 year property. Land improvements such as fencing, parking, sidewalks, exterior lighting, landscaping, site drainage, and certain site utilities. Roughly 5 to 15% of a residential rental basis, depending on the property.
27.5 year shell. Building structure, roof, walls, foundation, plumbing within the building, electrical within the building, HVAC, and similar structural and building system components. Does not qualify for bonus depreciation.
The IRS occasionally updates what goes where in the Cost Segregation Audit Techniques Guide. Carpet, for example, clearly qualifies as 5 year personal property because it is removable and non structural. HVAC went through a recent reclassification debate and generally stays at 27.5 years. Engineers who run studies stay current on the guidance.
How bonus depreciation interacts with cost seg
Cost seg alone reclassifies components into shorter recovery periods. Bonus depreciation on top of that lets you immediately deduct a percentage of the short life assets in year one. The two work together.
Without bonus depreciation, cost seg still has value because you are depreciating 5 year components over 5 years instead of 27.5 years. That is a meaningful acceleration but the year one impact is roughly 1/5 of the reclassified amount, not the full reclassified amount.
With 100% bonus (the 2017 through 2022 era), you could deduct the entire short life reclassification in year one. Cost seg + 100% bonus was the most aggressive depreciation strategy the US tax code has ever allowed on rental real estate.
At 40% bonus in 2026, you deduct 40% of the short life reclassification in year one and the remaining 60% depreciates on its 5 or 15 year schedule. Still powerful, but half the punch of 2022.
At 0% bonus in 2028, cost seg would still work but year one impact would come only from the 1/5 or 1/15 normal depreciation on the reclassified short life components. The strategy becomes about the time value of a 5 year vs 27.5 year clock, not a first year windfall.
The 2026 purchase decision
If you are deciding whether to buy and study a property in 2026 or 2027, the bonus depreciation phase down makes a real difference.
Take a sanitized example. Purchase price around $300K, building basis around $240K after land allocation, cost seg reclassifies roughly 25% into 5 year and 10% into 15 year buckets. That is about $60K of 5 year components and $24K of 15 year components.
2026 year one depreciation with 40% bonus: 40% of $84K = $33,600 in bonus, plus first year straight line on the remaining $50,400 short life ($10K+$1,600 = ~$11.6K), plus first year straight line on the 27.5 year shell ($5,600). Total year one roughly $50K.
2027 year one depreciation with 20% bonus on the same property: 20% of $84K = $16,800 in bonus, plus first year straight line on the remaining $67,200 short life (~$15K), plus shell ($5,600). Total year one roughly $37K.
Difference: about $13K less year one depreciation in 2027 vs 2026 on the same property. At a 32% bracket, that is roughly $4K of tax timing difference. Not life changing, but real. If you are a REPS investor with large W2 income to offset, that $4K compounds into a meaningful amount when applied across a multi property year.
The honest answer: do not buy a bad deal just to capture the 2026 bonus year, but do not delay a good deal into 2027 either.
Placed in service vs purchased
Bonus depreciation applies in the tax year the property is placed in service, not the year you bought it. “Placed in service” for a residential rental means the property is ready and available for its intended use (typically when the first tenant takes occupancy or when the unit is listed and actively marketed for rent).
Practical implication: if you close in December 2026 but the unit is not actively marketed for rent until January 2027, the property is in service in 2027 and falls under the 20% bonus rate. To lock in 2026 bonus, list the unit for rent (with a real listing, not a placeholder) before December 31, 2026. Many investors miss this at year end and lose the higher bonus rate.
Rehabs follow the same logic. If you bought in November 2026 but the rehab runs through February 2027, the property is placed in service in 2027. Budget for this on year end deals.
2027 planning: the 20% year
2027 is the last year with any bonus depreciation on the schedule, assuming no extension. Several planning moves make sense for investors looking past the phase down.
Front load 2026 and 2027 acquisitions where possible. If you were going to buy three properties over 2026 to 2028, try to close and place in service the first two in 2026 and the third in 2027. Skip 2028.
Prioritize cost seg on 2026 and 2027 properties. The 2028 and beyond properties will still benefit from cost seg via the 5 year and 15 year component acceleration, but the first year impact will be much smaller without bonus depreciation.
Watch for legislative extensions. Congress extended bonus depreciation multiple times in prior decades. A new extension is possible but not assumed. Do not plan your strategy around a hypothetical extension.
Consider Section 179 where applicable. For non building improvements after the fact, Section 179 can sometimes fill the gap, though it does not replace bonus depreciation on cost seg reclassified property.
How DoorVault tracks this
Tracking which property qualifies for which bonus rate gets complicated past a few deals. DoorVault’s tax report module tags each property with its placed in service date, applicable bonus rate, and reclassified component basis, then calculates depreciation and bonus automatically each year. See also cost segregation study cost benefit for the study ROI math.
Related DoorVault resources
- Cost Segregation for Rental Property Owners: The 2026 Playbook — the full pillar guide covering math, recapture, and portfolio strategy.
- Cost Segregation Study (glossary) — plain-English definition with typical reclassification percentages.
- Cost Segregation Estimator — free first-year deduction calculator to model the 2026 bonus depreciation math.
FAQ
What is the bonus depreciation rate in 2026?
40%. Down from 60% in 2024 and 80% in 2023, the rate held at 40% for 2025 and 2026 due to legislative changes.
When does bonus depreciation expire?
2028 under current law, unless Congress extends. 2027 is the 20% year, 2028 drops to 0%.
Does bonus depreciation apply to the whole building?
No. Only to the 5 year and 15 year components that a cost segregation study reclassifies. The 27.5 year residential building shell does not qualify.
What counts as placed in service for a rental property?
Ready and available for its intended use. Typically when the unit is actively marketed for rent or the first tenant takes occupancy. Closing date is not the same as placed in service date.
Plan your 2026 moves
Model bonus depreciation on your next purchase with the depreciation calculator. For the full playbook, go back to the cost segregation pillar. Track placed in service dates and depreciation across every property at https://doorvault.app.
