The Short Answer
A cost segregation study reclassifies building components from 27.5-year (residential) or 39-year (commercial) depreciation to 5-year, 7-year, and 15-year property. Combined with 100% bonus depreciation (now permanent under the One Big Beautiful Bill Act signed July 4, 2025), this can generate $50,000-$200,000+ in first-year federal deductions on a $1 million property. But New Jersey does not allow bonus depreciation and caps Section 179 deductions at $25,000 — so your NJ taxable income will be significantly higher than your federal taxable income in the early years. Understanding both sides is critical before committing to a study.
What Is Cost Segregation?
Standard depreciation treats a building as a single asset. A residential rental property depreciates over 27.5 years under IRC Section 168(c). A commercial property depreciates over 39 years. Every component — the roof, HVAC, electrical, plumbing, carpet, appliances, landscaping, parking lot — all depreciate at the same slow rate.
A cost segregation study, performed by an engineering firm, identifies components that qualify for shorter depreciation lives under the Modified Accelerated Cost Recovery System (MACRS):
| Component Category | MACRS Life | Examples |
|---|---|---|
| Personal property (Section 1245) | 5 years | Carpeting, appliances, decorative fixtures, specialty electrical, signage |
| Personal property (Section 1245) | 7 years | Office furniture, certain HVAC components, security systems |
| Land improvements (Section 1250) | 15 years | Parking lots, sidewalks, landscaping, fencing, site drainage, exterior lighting |
| Building structure (Section 1250) | 27.5 or 39 years | Structural walls, foundation, standard plumbing, standard electrical |
A typical cost segregation study reclassifies 15-40% of a building's cost to shorter-lived categories. On a $1 million commercial property, that's $150,000-$400,000 moved from 39-year to 5, 7, or 15-year depreciation schedules.
The OBBBA Game-Changer: Permanent 100% Bonus Depreciation
The Tax Cuts and Jobs Act of 2017 introduced 100% bonus depreciation under IRC Section 168(k), allowing immediate expensing of qualified property in the year it's placed in service. The OBBBA permanently restored 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025. The previous TCJA phasedown schedule (80%→60%→40%→20%→0%) was repealed. NJ still does not conform — straight-line depreciation required for NJ purposes.
The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, made 100% bonus depreciation permanent. This is the single most significant change for real estate investors using cost segregation. Property placed in service in 2026 and beyond qualifies for 100% first-year bonus depreciation on all eligible components — no phase-down, no sunset.
What This Means for Cost Segregation
Before OBBBA, the value of cost segregation was declining because bonus depreciation was phasing out. A study done in 2025 only captured 40% bonus depreciation on reclassified components. Now, the full 100% is available permanently, making cost segregation studies more valuable than they've been since 2022.
For a $1 million commercial property with 30% of costs reclassified to 5 and 7-year property and 10% to 15-year property:
| Approach | Year 1 Federal Depreciation |
|---|---|
| Standard depreciation (39-year) | ~$25,641 |
| Cost segregation WITHOUT bonus depreciation | ~$73,000 (accelerated MACRS on reclassified components) |
| Cost segregation WITH 100% bonus (OBBBA) | ~$400,000 (immediate expensing of all reclassified components) |
That's a $374,000 difference in first-year deductions between standard depreciation and cost segregation with permanent bonus depreciation. At a 37% federal rate, the first-year tax savings is approximately $138,000.
The NJ Trap: No Bonus Depreciation, $25,000 Section 179 Cap
Here is where NJ property owners get caught. New Jersey does not conform to federal bonus depreciation. Period. NJ also caps Section 179 deductions at just $25,000 (compared to $2,560,000 federally in 2026, after the OBBBA doubled the base limit).
NJ Depreciation Rules
- No bonus depreciation: NJ requires you to add back any federal bonus depreciation claimed under IRC Section 168(k). You then depreciate the property over its regular MACRS life for NJ purposes.
- Section 179 cap: NJ limits Section 179 expensing to $25,000, regardless of the federal limit. Any federal Section 179 deduction above $25,000 must be added back for NJ.
- NJ recovery: The bonus depreciation you added back on your NJ return is recovered over the remaining MACRS life of the asset. So you're not losing the deduction permanently — you're spreading it over more years.
Example: $1M Commercial Property in NJ
| Federal | New Jersey | |
|---|---|---|
| Standard 39-year depreciation | $25,641 | $25,641 |
| Reclassified to 5/7/15-year (cost seg) | $400,000 (with bonus) | Varies by MACRS schedule |
| Year 1 deduction with cost seg + bonus | ~$400,000 | ~$73,000 (no bonus, regular MACRS) |
| NJ add-back required | N/A | ~$327,000 (bonus depreciation add-back) |
| NJ recovery of add-back | N/A | Spread over remaining MACRS life |
In Year 1, your federal taxable income is $374,000 lower than it would be with standard depreciation. But your NJ taxable income is only about $47,000 lower ($73,000 accelerated MACRS minus $25,641 standard). The NJ add-back creates a situation where you owe significantly more NJ tax in the early years than your federal return would suggest.
At the top NJ rate of 10.75%, the $327,000 add-back generates approximately $35,000 in additional NJ tax in Year 1 compared to what you'd expect based on your federal return. You recover this over time as the NJ depreciation catches up, but the cash flow impact in the first few years is real and must be planned for.
When Cost Segregation Makes Sense Despite the NJ Trap
Cost segregation is still highly beneficial for NJ property owners in most cases. The federal savings vastly outweigh the NJ timing difference. But the analysis must account for both jurisdictions.
Properties Over $750,000
Cost segregation studies typically cost $5,000-$15,000 depending on property size and complexity. The breakeven point is generally around $750,000 in property value. Below that, the study cost may not be justified by the incremental savings over standard depreciation.
Rental Properties (27.5-Year to 5/7/15-Year)
Residential rental properties benefit significantly because the baseline depreciation period (27.5 years) is already shorter than commercial (39 years), meaning more of the acceleration value comes from bonus depreciation on the reclassified components.
High-Income Property Owners
If your federal marginal rate is 37% and your NJ rate is 10.75%, the net benefit of federal bonus depreciation minus NJ add-back is approximately 26.25% of the accelerated amount. On $300,000 of reclassified and bonus-depreciated components, that's a net tax benefit of approximately $78,750 in Year 1.
Properties Held for 5+ Years
The NJ add-back is recovered over the MACRS life of the reclassified components. If you sell before the NJ depreciation catches up, you don't get the full NJ benefit. Properties held for at least 5-7 years allow the NJ depreciation to substantially catch up to federal.
Cost Segregation and 1031 Exchanges
Under IRC Section 1031, you can defer gain on the sale of investment property by exchanging it for like-kind property. Cost segregation interacts with 1031 exchanges in important ways:
- Depreciation recapture: When you sell a property on which you've claimed accelerated depreciation, the reclassified Section 1245 personal property is subject to ordinary income recapture under IRC Section 1245 (taxed at ordinary rates, not capital gains rates). A 1031 exchange defers this recapture.
- Step-up on replacement property: The replacement property in a 1031 exchange inherits the deferred gain, but a new cost segregation study on the replacement property can restart accelerated depreciation on the new building's components.
- NJ 1031 rules: NJ generally conforms to federal 1031 exchange treatment, but the depreciation recovery differences mean the NJ gain calculation on a deferred exchange may differ from federal. NJ add-backs carried forward must be tracked through the exchange.
The Cost Segregation Process
Step 1: Feasibility Analysis
I review the property type, value, and acquisition date to determine if cost segregation is likely to produce meaningful savings. This initial analysis is included in our real estate tax services consultation — no charge for existing clients.
Step 2: Engineering Study
A qualified cost segregation firm (we work with several nationally recognized firms) inspects the property and reviews construction documents to classify each component. The study produces a detailed report identifying every reclassified asset, its cost, and its MACRS recovery period.
Step 3: Tax Return Integration
I integrate the cost segregation study results into your federal and NJ tax returns, including the appropriate NJ add-back schedules, depreciation recovery calculations, and Form 4562 (Depreciation and Amortization). I handle both the federal optimization and the NJ compliance — so you're not surprised by a NJ tax bill you weren't expecting.
Step 4: Ongoing Tracking
Each year, I track the federal vs. NJ depreciation basis differences, apply the correct recovery amounts, and project the remaining NJ add-back recovery schedule. This ongoing tracking is critical and is something most DIY approaches miss entirely.
Lookback Studies for Existing Properties
You don't need to have purchased the property this year to benefit. A "lookback" cost segregation study can be performed on properties acquired in prior years. Under IRS Revenue Procedure 2023-24 (automatic change in accounting method), you can claim the cumulative catch-up depreciation in a single year without amending prior returns. This is filed using Form 3115 (Application for Change in Accounting Method).
For a property purchased in 2020 with $200,000 in reclassifiable components, the lookback study would allow you to claim 5-6 years of missed accelerated depreciation in a single deduction on your 2026 return. With permanent bonus depreciation under OBBBA, the lookback becomes even more powerful.
Who Should Not Do Cost Segregation
- Properties under $500,000: The study cost ($5,000-$15,000) relative to the tax savings may not justify the investment
- Short-term holds (under 3 years): Depreciation recapture on sale may negate the acceleration benefit, especially for NJ where the add-back recovery hasn't had time to catch up
- Passive activity loss limitations: Under IRC Section 469, passive losses (including rental depreciation) can only offset passive income unless you qualify as a real estate professional under IRC Section 469(c)(7). Cost segregation accelerates deductions, but those deductions are trapped as suspended passive losses if you can't use them
- Owner-occupied primary residences: Depreciation is not allowed on personal-use property
Federal vs. NJ Depreciation Summary Table
| Item | Federal (2026) | New Jersey (2026) |
|---|---|---|
| 100% bonus depreciation (Section 168(k)) | Yes — permanent under OBBBA | No — full add-back required |
| Section 179 expensing limit | $2,560,000 | $25,000 |
| MACRS depreciation (regular) | Yes | Yes (conforms to federal MACRS schedules) |
| Cost segregation reclassification | Fully allowed | Allowed (shorter MACRS lives apply) |
| Bonus depreciation on reclassified components | Yes (100%) | No (must use regular MACRS) |
| Recovery of NJ add-back | N/A | Over remaining MACRS life of each component |
For current IRS guidance on bonus depreciation under the OBBBA, see IRS Publication 946 (How to Depreciate Property).
Why You Need a CPA for This
Cost segregation is not a DIY project. The engineering study itself is performed by specialists, but integrating the results into your federal and NJ returns, managing the NJ add-back schedules, tracking basis differences year over year, and coordinating with 1031 exchanges or future sales requires a CPA who understands both jurisdictions.
I work personally with every real estate client. I handle the calculations personally, coordinate directly with the cost segregation engineering firm, integrate the study into your returns, and handle the NJ-specific compliance that most national firms overlook.
Talk to a CPA about cost segregation for your property: Schedule a free consultation | Real estate tax services
Frequently Asked Questions
Does New Jersey allow cost segregation?
NJ allows the reclassification of building components to shorter MACRS lives (5, 7, 15 years). What NJ does not allow is bonus depreciation on those reclassified components. You can use regular accelerated MACRS depreciation rates for NJ purposes, but you must add back any federal bonus depreciation claimed under Section 168(k). The add-back is recovered over the remaining MACRS life of each asset.
How much does a cost segregation study cost?
Typical cost segregation studies range from $5,000 to $15,000 depending on property size, complexity, and type. The breakeven point for most properties is around $750,000 in value. For properties above $1 million, the first-year federal tax savings with 100% bonus depreciation typically exceeds the study cost by 10-20x or more.
Can I do a cost segregation study on a property I bought years ago?
Yes. A lookback cost segregation study can be performed on properties acquired in prior years. The cumulative catch-up depreciation is claimed in a single year using Form 3115 (Change in Accounting Method) under IRS Revenue Procedure 2023-24. You do not need to amend prior returns. This is especially valuable now that OBBBA has made 100% bonus depreciation permanent.
Does cost segregation trigger depreciation recapture when I sell?
Yes. Reclassified Section 1245 personal property (5 and 7-year assets) is subject to ordinary income recapture under IRC Section 1245 when sold. This means the depreciation you claimed is "recaptured" and taxed at ordinary income rates (up to 37% federal) rather than the 25% Section 1250 recapture rate that applies to standard building depreciation. A 1031 exchange defers this recapture. Planning for recapture at the time of the cost segregation study is essential.
How does the NJ BAIT election interact with cost segregation?
If you hold rental property through a pass-through entity (S-Corp, partnership, or LLC) that elects the NJ Business Alternative Income Tax (BAIT), the NJ depreciation add-back affects the entity's BAIT calculation. The entity pays NJ tax at the entity level on income that includes the depreciation add-back, and the owners receive a credit on their personal NJ returns. The NJ add-back mechanics are the same, but the entity-level payment and personal credit add complexity. Learn about the NJ BAIT election.
Is 100% bonus depreciation really permanent now?
Yes. The OBBBA, signed July 4, 2025, made 100% bonus depreciation under IRC Section 168(k) permanent for qualified property placed in service after September 27, 2017. There is no phase-down and no sunset date. Congress could change this in the future, but as of 2026, 100% bonus depreciation is permanent law.
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