You have seen the headlines. Six-figure deductions. Large first-year write-offs. Real tax savings from a single study.
The question every investor asks before ordering a cost segregation study is simple: what will my actual savings be?
The honest answer is that it depends. Cost segregation delivers real, documented tax savings. The exact number depends on your property, your basis, your tax rate, and how you can use the deduction. No two results are identical.
A quick clarification on "cash back from the IRS." A cost segregation deduction reduces your taxable income. You receive an actual refund only if you already overpaid tax for the year or you claim a catch-up adjustment on a prior investment.
This article walks through three scenarios with specific numbers. You will see first-year results for a single-family rental, a multifamily property, and a commercial look-back study. You will also learn when savings come in lower than expected, why recapture matters at sale, and why even modest results can still produce a strong return.
Key Takeaways
- First-year savings depend on four variables: depreciable basis, reclassification percentage, the applicable bonus depreciation rate, and your marginal tax rate.
- The One Big Beautiful Bill Act made 100% bonus depreciation permanent only for property both acquired after January 19, 2025 and placed in service after that date. Property under a binding contract signed on or before that date stays on the phase-down schedule.
- For a look-back study, reclassified components use the bonus rate from the year the property was placed in service, not the current-year rate.
- A fully engineered study starts at $2,320 for residential property and $2,730 for commercial, with a Rapid Report option from $950. Larger properties and portfolios price above those starting points.
- A $400,000 single-family rental in these examples produces about $23,400 to $36,100 in first-year tax savings, roughly 10x to 16x the starting study fee.
- A $1.2 million multifamily property here produces about $118,500 in first-year savings, roughly 15x the study cost for a property of that size.
- Accelerated depreciation can be recaptured at sale, so weigh recapture and the passive activity loss rules before you commit.
What Determines Your First-Year Savings
Four variables drive your first-year tax savings from a cost segregation study.
The core formula estimates the savings from the reclassified, bonus-eligible portion:
Depreciable Basis × Reclassification % × Bonus Depreciation Rate × Marginal Tax Rate = First-Year Tax Savings (bonus portion)
Your total first-year deduction is usually higher. You also claim regular depreciation on the remaining building basis. The case studies below add that amount separately.
Here is what each variable means:
- Depreciable basis: Your purchase price minus land value. Only the building and its components can be depreciated.
- Reclassification percentage: The share of your depreciable basis that a study moves into shorter recovery periods of 5, 7, and 15 years (IRS Publication 946). Industry cost segregation studies typically show 20% to 30% for residential and 25% to 40% for commercial, depending on finishes and specialty systems.
- Bonus depreciation rate: The share of reclassified assets you can deduct immediately. The One Big Beautiful Bill Act restored 100% bonus depreciation permanently, but the 100% rate is a two-part test: the property must be acquired after January 19, 2025 and placed in service after that date (IRS). Property under a binding contract entered into on or before January 19, 2025 stays on the phase-down schedule even if it is placed in service later. Property placed in service earlier uses the rate from that year, such as 80% for 2023 and 60% for 2024.
- Marginal tax rate: Your highest federal bracket. An investor at 37% saves more per dollar of deduction than one at 24%.
A quick example using the formula: $600,000 depreciable basis × 28% reclassification × 100% bonus × 37% tax rate = $62,160 from the reclassified portion.
No two properties produce identical results. The formula still gives you a reliable framework for estimating yours.
Case Study 1: Single-Family Rental ($400K Purchase)
Property: $400,000 single-family rental home
Land allocation: 15%
Depreciable basis: $340,000
The study reclassifies 26% of the depreciable basis, or $88,400, into 5- and 15-year property. This includes flooring, cabinetry, appliances, light fixtures, landscaping, paving, and certain plumbing and electrical components.
First-year deductions:
- Bonus depreciation on reclassified components: $88,400
- Standard depreciation on the remaining basis ($251,600 ÷ 27.5): about $9,100
- Total first-year deduction: about $97,500
Residential rental property depreciates over 27.5 years (IRS Publication 527). The first-year figure uses a full-year amount for simplicity. The actual first-year deduction is slightly lower because MACRS applies a mid-month convention.
Tax savings:
- At the 37% marginal rate: about $36,100
- At the 24% marginal rate: about $23,400
Study cost: from $2,320 (fully engineered, residential)
Year-one return: roughly 10x to 16x the study fee.
A study starting at $2,320 generates $23,400 to $36,100 in first-year tax savings on this property. The study pays for itself many times over within the first tax year.
Is a $400,000 property too small for cost segregation?
No. Smaller properties can still produce meaningful returns. As an illustration, a $250,000 property might generate roughly $12,000 to $20,000 in first-year savings for a higher-bracket investor, depending on land allocation and finishes. Against a fully engineered study starting at $2,320, or a Rapid Report from $950, the break-even point is low. If your tax savings exceed the study fee and you can use the deduction this year, you are ahead. Run the numbers for your property.
Case Study 2: Multifamily Property ($1.2M Purchase)
Property: $1.2 million 12-unit apartment building
Land allocation: 18%
Depreciable basis: $984,000
Multifamily properties often reclassify a similar or slightly higher share than single-family rentals. Each unit repeats qualifying components such as cabinetry, appliances, fixtures, and flooring. Results still vary widely by property.
The study reclassifies 30% of the depreciable basis, or $295,200, into accelerated recovery categories.
First-year deductions:
- Bonus depreciation on reclassified components: $295,200
- Standard depreciation on the remaining basis ($688,800 ÷ 27.5): about $25,000
- Total first-year deduction: about $320,200
Tax savings at 37%: about $118,500
Study cost: about $7,500. A twelve-unit building sits well above the $2,320 starting price for a fully engineered residential study, because unit count and system complexity drive the fee.
Year-one return: about 15x on the study investment.
How you use the deduction depends on your tax status. For an investor who qualifies as a Real Estate Professional and materially participates, these losses are non-passive. The $320,200 deduction can offset W-2 or active business income. Even then, the Section 461(l) excess business loss cap limits how much you can use in one year: roughly $256,000 for a single filer and $512,000 for a married couple filing jointly in 2026, indexed annually and made permanent by the One Big Beautiful Bill Act. A $320,200 loss fits under the joint limit, but a single filer at the same numbers would be capped near $256,000, with the excess carrying forward as a net operating loss that is then subject to the 80% taxable income limitation. That cuts the tax bill by about $118,500 at a 37% rate for a filer who can use the full deduction. For passive investors, the deduction offsets passive income, and any excess carries forward under the passive activity loss rules.
The difference between standard depreciation ($25,000 per year) and the study ($320,200 in year one) is $295,200 in front-loaded deductions. That front-loading is what makes the study valuable.
Case Study 3: Commercial Retail ($2M Purchase, Look-Back Study)
Property: $2 million retail strip center, placed in service in 2023
Land allocation: 15%
Depreciable basis: $1,700,000
Prior cost segregation: None. Straight-line depreciation was claimed for three years at about $43,600 per year ($1.7M ÷ 39).
This is a look-back study. The investor has owned the property for three years and claimed only straight-line depreciation. A study identifies what should have been reclassified from the start.
The study reclassifies 32% of the depreciable basis, or $544,000, into 5- and 15-year property.
Here is a detail many articles miss. Reclassified components use the bonus rate from the year the property was placed in service. This property was placed in service in 2023. So the components qualify for the 80% bonus rate in effect that year, not the 100% rate restored for 2025 and later (IRS Publication 946).
The catch-up math, with assumptions stated:
- 80% bonus on $544,000: $435,200
- Regular MACRS on the remaining $108,800 over 5- and 15-year lives for three years: about $50,000
- Less straight-line already claimed on those components at the 39-year rate: about $42,000
- Section 481(a) catch-up adjustment: about $443,000
This entire adjustment flows through the current-year return on Form 3115. No amended returns are required.
The same Section 461(l) cap applies here. A $443,000 loss stays under the roughly $512,000 joint limit for 2026 but leaves little room for other business losses, and it exceeds the roughly $256,000 single-filer limit outright. Any excess carries forward as a net operating loss subject to the 80% taxable income limitation, so the benefit is spread across years rather than lost.
Tax savings at 37%: about $164,000, captured in the current year, assuming the loss is not limited by the excess business loss cap.
Study cost: about $8,000. Fully engineered commercial studies start at $2,730; a strip center of this size, with multiple tenant spaces and a look-back component, prices above that.
Year-one return: roughly 20x.
Look-back studies can produce some of the largest single-year deductions in real estate tax planning. They capture years of missed acceleration in one adjustment.
How long does it take to receive my refund after filing?
If you claim the deductions on your current-year return, including Form 3115 for a look-back study, the refund follows standard IRS processing. The IRS issues most refunds on e-filed returns within about 21 days (IRS). If you amend a prior-year return instead, the IRS generally takes 8 to 16 weeks to process Form 1040-X (IRS).
Don't Forget Recapture and the Passive Loss Rules
Two factors can reduce the net benefit, and honest planning accounts for both.
First, accelerated depreciation can be recaptured when you sell. Gain attributable to depreciation is taxed, and the rate depends on which bucket the asset falls into:
- 5- and 7-year personal property. Section 1245 property. All gain up to the depreciation taken is recaptured at ordinary income rates.
- 15-year land improvements such as landscaping and paving. These are Section 1250 real property, not personal property. Only depreciation claimed in excess of straight-line is recaptured as ordinary income; the remainder is unrecaptured Section 1250 gain taxed at a maximum 25%.
- 27.5- and 39-year real property. Unrecaptured Section 1250 gain, taxed at a maximum 25%.
Cost segregation front-loads deductions, so it can increase the amount subject to recapture later.
Second, the passive activity loss rules matter. If you do not qualify as a real estate professional and do not meet the short-term rental tests, your deduction may be suspended. In that case it offsets passive income or carries forward until you sell.
When First-Year Savings Are Lower Than Expected
Not every property produces six-figure savings. Setting honest expectations helps you make an informed decision.
Factors that reduce first-year results:
- High land allocation. A property with 30% land value has a smaller depreciable basis than one with 15%. Less basis means less to reclassify.
- Basic construction. Properties with minimal finish-out, simple drywall, and no specialized systems have fewer components to accelerate.
- Lower tax bracket. An investor in the 24% bracket saves $24 per $100 of deduction. An investor at 37% saves $37.
- Older properties with few remaining components. Properties that have had components replaced or removed over decades may yield less.
- A lower historical bonus rate. For a look-back study, the reclassified components use the bonus rate from the placed-in-service year. A 2024 purchase uses 60%, which is lower than the current 100% rate.
Consider a case where a study may not pay off in year one. A $300,000 property with 30% land, basic finishes, and an owner in the 24% bracket might reclassify only 18% of a $210,000 basis. That is about $37,800, or roughly $9,000 in first-year savings at 24%. That still exceeds a $2,320 study fee on paper, but if the passive loss rules suspend the deduction, none of it lands this year and the study will not pay for itself until you have passive income or sell. In that situation, wait until you can use the deduction, or skip the study.
Even modest results can still represent a strong return. A $350,000 property that produces $18,000 in first-year savings against a study starting at $2,320 delivers roughly an 8x return, provided you can use the deduction.
The goal is not to inflate promises. The goal is to run the numbers for your property and make an informed decision.
Know Your Numbers Before You Commit
The savings are real. They are also specific to your property, your basis, your tax rate, and how you can use the deduction. Do not rely on averages or marketing claims. Get your own numbers.
Ready to see your specific first-year savings? Get a free proposal from R.E. Cost Seg and find out what your property can deliver. You can also estimate your savings with our depreciation calculator.
