If you own rental property and you have not looked at your depreciation strategy recently, now is the time. The One Big Beautiful Bill Act (OBBBA) restored 100% bonus depreciation permanently under IRC Sec. 168(k), eliminating the phasedown that had been cutting into investor deductions since 2023. For real estate investors running cost segregation studies, this is the single most valuable development in years.
This guide explains exactly what bonus depreciation is, what qualifies, what does not, and how you can use it alongside cost segregation to generate six-figure tax deductions in Year 1 of owning a rental property.
What Is Bonus Depreciation? (IRC Sec. 168(k))
Bonus depreciation is a federal tax provision that allows you to deduct the full cost of qualifying property in the year it is placed in service, rather than spreading that deduction over the asset's normal recovery period. Under IRC Sec. 168(k), this applies to tangible personal property and certain improvements with a Modified Accelerated Cost Recovery System (MACRS) recovery period of 20 years or less.
In practical terms: if a cost segregation study identifies $150,000 worth of 5-year, 7-year, and 15-year components inside your rental property, you can deduct the entire $150,000 in Year 1 instead of spreading it out over those recovery periods.
The History: From TCJA to the OBBBA
The Tax Cuts and Jobs Act (TCJA) of 2017 introduced 100% bonus depreciation for property placed in service after September 27, 2017 and before January 1, 2023. Congress included a scheduled phasedown:
- 2023: 80% bonus depreciation
- 2024: 60% bonus depreciation
- 2025: 40% bonus depreciation
- 2026: 20% bonus depreciation (under the old schedule)
- 2027 and beyond: 0% bonus depreciation (under the old schedule)
That phasedown created uncertainty for investors. Many delayed acquisitions or rushed closings to capture higher percentages. The OBBBA eliminated this problem entirely.
OBBBA: 100% Bonus Depreciation Is Permanent
The One Big Beautiful Bill Act restored 100% first-year bonus depreciation with no phasedown and no sunset date. Property placed in service in 2026 and every year going forward qualifies for the full deduction. This applies retroactively to property placed in service after December 31, 2022, meaning investors who took reduced bonus during the 2023, 2024, and 2025 phasedown years may be able to recover the difference.
For real estate investors, this is the green light to move aggressively on cost segregation studies and bonus depreciation planning.
What Qualifies for Bonus Depreciation
Under IRC Sec. 168(k)(2), property must meet these requirements to qualify:
- MACRS recovery period of 20 years or less. This includes 5-year property (appliances, carpeting, vinyl flooring, cabinetry), 7-year property (furniture, office equipment, certain fixtures), and 15-year property (land improvements such as driveways, sidewalks, landscaping, fencing, parking lots, and exterior lighting).
- Original use begins with the taxpayer, OR the property is acquired used and meets the "used property" rules. The TCJA expanded bonus depreciation to cover used property for the first time, as long as the taxpayer had not previously used the property and it was not acquired from a related party.
- Placed in service during the tax year. The property must actually be in use or ready for its intended purpose, not just purchased.
What Does NOT Qualify
Two major categories of rental property costs are excluded from bonus depreciation:
- The building structure itself. Residential rental buildings carry a 27.5-year recovery period under IRC Sec. 168(c). Nonresidential real property (including short-term rentals classified under IRC Sec. 168(e)(2)(B)) carries a 39-year recovery period. Both exceed the 20-year cutoff.
- Land. Land is not depreciable at all under IRC Sec. 167(a) because it does not have a determinable useful life.
This is exactly why cost segregation matters so much. Without a cost seg study, 100% of your building is depreciating over 27.5 or 39 years. With a study, 25% to 40% of the building cost gets reclassified into bonus-eligible categories.
How Bonus Depreciation and Cost Segregation Work Together
Cost segregation and bonus depreciation are two separate tax provisions that create massive value when combined:
- Cost segregation (IRC Sec. 1245 and 1250) identifies and reclassifies building components from the default 27.5 or 39 year recovery period into shorter asset classes: 5-year, 7-year, and 15-year property.
- Bonus depreciation (IRC Sec. 168(k)) then deducts 100% of those reclassified components in Year 1.
Without cost segregation, bonus depreciation has nothing to apply to (because the building itself does not qualify). Without bonus depreciation, cost segregation still accelerates deductions, but over 5, 7, and 15 years rather than all at once.
Real Example: $500,000 Rental Property
Consider a single-family rental purchased for $500,000 (excluding land value of $75,000, leaving a depreciable basis of $425,000):
| Component | Amount | Without Cost Seg (Yr 1) | With Cost Seg + Bonus (Yr 1) |
|---|---|---|---|
| 5-Year Property | $63,750 (15%) | $0 | $63,750 |
| 7-Year Property | $42,500 (10%) | $0 | $42,500 |
| 15-Year Property | $42,500 (10%) | $0 | $42,500 |
| 27.5-Year Structure | $276,250 (65%) | $10,045 | $10,045 |
| Total Year 1 Deduction | $425,000 | $15,454 | $158,795 |
The investor with cost segregation and bonus depreciation claims $158,795 in Year 1, compared to just $15,454 with straight-line depreciation alone. At a 37% marginal tax rate, that is an additional $53,036 in tax savings in the first year.
Scaling Up: $1.2 Million Property
For a larger property purchased at $1,200,000 (land: $200,000, depreciable basis: $1,000,000), a cost segregation study reclassifying 35% of the depreciable basis yields $350,000 in bonus-eligible components. At a 37% marginal rate, the Year 1 tax savings from bonus depreciation alone total $129,500. That is real cash flow that can fund your next acquisition.
Bonus Depreciation vs. Section 179: Know the Difference
Investors sometimes confuse bonus depreciation with Section 179 expensing. Both allow accelerated deductions, but the differences matter:
| Feature | Bonus Depreciation (168(k)) | Section 179 |
|---|---|---|
| Annual Dollar Cap | No cap | $1,050,000 (2026) |
| Can Create a Loss | Yes | No; limited to taxable income |
| Rental Property Eligible | Yes (with cost seg) | Limited; residential rental improvements only after 2017 |
| Phase-Out Threshold | None | Begins at $2,620,000 in placed-in-service cost (2026) |
For most rental property investors running cost segregation studies, IRC Sec. 168(k) bonus depreciation is the primary tool. Section 179 serves as a complement in specific situations but rarely replaces bonus for large-scale real estate.
Electing Out of Bonus Depreciation: IRC Sec. 168(k)(7)
Not every investor wants to take all their depreciation in Year 1. IRC Sec. 168(k)(7) allows you to elect out of bonus depreciation for any class of property placed in service during the tax year. The election is made on a class-by-class basis (all 5-year property, all 7-year property, or all 15-year property).
You might elect out if:
- You had a low-income year and expect significantly higher income in future years
- You already have enough losses from other sources to offset your current income
- You want to spread depreciation across multiple years for steadier tax planning
- You are concerned about depreciation recapture under IRC Sec. 1245 or 1250 if you plan to sell soon
This election must be made on your original, timely filed return (including extensions) for the year the property is placed in service. Once made, it is irrevocable for that tax year and class of property.
Placed-in-Service Rules
Property must be "placed in service" during the tax year to claim bonus depreciation. Under Treasury Regulation Sec. 1.167(a)-11(e)(1)(i), property is placed in service when it is in a condition or state of readiness and availability for its specifically assigned function. For rental property, this generally means the property is ready to be rented, not merely purchased.
Key timing considerations:
- Closings near year-end: If you close on December 15 and the property is move-in ready, it is placed in service in that tax year. If it needs significant renovation, it may not be placed in service until the following year.
- Renovations and improvements: Each improvement component has its own placed-in-service date. A kitchen renovation completed in March is placed in service in March, even if you bought the property in January.
- Furnished short-term rentals: Furniture, appliances, and fixtures are placed in service when the property is listed and available for guests, not when you purchase the items.
The STR Loophole Connection
Bonus depreciation becomes dramatically more powerful when paired with the short-term rental tax loophole. Here is why:
Under IRC Sec. 469, rental activities are generally passive. Passive losses can only offset passive income, not W-2 wages or business income. However, short-term rentals with an average rental period of 7 days or less are not treated as "rental activities" for purposes of IRC Sec. 469. If the STR owner also materially participates in the activity, the resulting losses are non-passive.
That means: cost segregation reclassifies components into bonus-eligible categories, bonus depreciation creates a large Year 1 loss, and the STR loophole allows that loss to offset your W-2 income, business income, or any other active income. An investor earning $400,000 in W-2 wages who purchases a $750,000 short-term rental could generate $100,000 or more in non-passive losses through this combination, saving $37,000+ in federal taxes in a single year.
For a deeper comparison of how STR and LTR properties are treated differently for tax purposes, read our STR vs LTR tax treatment guide.
Already Own Property? Use Form 3115 to Catch Up
If you purchased a rental property in a prior year and never performed a cost segregation study, you have not missed your chance. Form 3115 (Application for Change in Accounting Method) allows you to claim all missed accelerated depreciation in a single tax year through a Section 481(a) adjustment, without amending prior returns.
This catch-up provision can be even more valuable than doing cost segregation at the time of purchase, because you capture multiple years of missed deductions in one lump sum.
How AE Tax Advisors Can Help
At AE Tax Advisors, we specialize in cost segregation studies and bonus depreciation planning for real estate investors. Our advisory engagement is $7,800, which includes a comprehensive tax strategy covering cost segregation, bonus depreciation optimization, entity structuring, and ongoing planning. Cost segregation studies are available as part of our service suite, and amendment work for prior years is $2,500 per year.
Whether you are purchasing your first rental property or managing a portfolio of 20+ units, we build a depreciation strategy that maximizes your Year 1 deductions while keeping you compliant with every IRC provision. Use our cost segregation calculator to estimate your potential savings, then request your free assessment to get started.
Key Takeaways
- 100% bonus depreciation is permanent under the OBBBA. No phasedown, no sunset.
- Only property with a MACRS recovery period of 20 years or less qualifies (5, 7, and 15 year components).
- Cost segregation identifies those components; without it, your entire building depreciates over 27.5 or 39 years.
- Bonus depreciation has no dollar cap and can create losses, unlike Section 179.
- STR owners who materially participate can use bonus-driven losses to offset W-2 and active income.
- Already own property? File Form 3115 to catch up on missed depreciation in one year.