What is Cost Segregation?
Cost segregation is a tax strategy that allows real estate owners to accelerate depreciation deductions by reclassifying building components into shorter depreciation categories. Instead of depreciating an entire commercial building over 39 years (or a residential rental over 27.5 years), a cost segregation study identifies components that qualify for 5-year, 7-year, or 15-year depreciation under MACRS (Modified Accelerated Cost Recovery System).
The result is dramatically larger depreciation deductions in the early years of ownership, generating real tax savings that can be reinvested, used to service debt, or applied to other properties. For a \$2 million commercial property, a cost segregation study might generate \$100,000 or more in additional first-year deductions depending on the bonus depreciation rate for the year the property was placed in service.
The strategy is fully sanctioned by the IRS, which issued formal guidance in its Cost Segregation Audit Techniques Guide. The Tax Cuts and Jobs Act of 2017 amplified the benefit by allowing 100% bonus depreciation on short-lived assets placed in service from 2018 through 2022.
How This Calculator Works
This calculator uses industry-standard allocation percentages derived from engineering-based cost segregation studies published by firms such as KBKG and Engineered Tax Services. These percentages represent the typical proportion of a building's cost that qualifies for each accelerated depreciation category.
**Asset classes and typical allocation by property type:**
- **5-Year Property**: Personal property such as carpeting, specialty lighting, and removable fixtures. - **7-Year Property**: Office furniture, certain equipment, and other 7-year assets. - **15-Year Property**: Land improvements including parking lots, sidewalks, fencing, and landscaping. - **Remaining Real Property**: Structural building components depreciated over 27.5 or 39 years.
**Bonus depreciation rates by year placed in service:**
Bonus depreciation under IRC Section 168(k) allows an immediate first-year deduction for qualifying short-lived assets.
- 2018 through 2022: 100% - 2023: 80% - 2024: 60% - 2025: 40% - 2026: 20%
The calculator compares the standard straight-line depreciation schedule to the accelerated MACRS schedule with applicable bonus depreciation. The difference multiplied by your combined federal and state tax rate is the estimated tax savings.
Who Should Use This Calculator
This calculator is designed for:
- **Real estate investors** who own commercial or rental properties and want to understand the potential tax benefit before commissioning a formal study. - **Property owners** evaluating whether a cost segregation study makes financial sense for a recent acquisition or existing property. - **CPAs and tax advisors** who want a quick estimate to share with clients before engaging an engineering firm. - **Commercial real estate buyers** in due diligence who want to model the after-tax economics of a purchase.
Cost segregation is generally most beneficial for properties valued at \$500,000 or more. The tax savings on smaller properties may not exceed the cost of the engineering study required to document the reclassifications.
How to Use
1. Select your **property type** from the dropdown. The recovery period (27.5 or 39 years) is set automatically based on IRS rules. 2. Enter the **purchase price** of the property. 3. Enter the **land value**. Land is not depreciable under US tax law and must be excluded from the basis. Land typically represents 10 to 25 percent of total property value. 4. Select the **year placed in service**. This determines the applicable bonus depreciation rate, which affects how much you can deduct in year one. 5. Set your **federal marginal tax rate** using the slider. Use your marginal rate — the rate applied to your last dollar of income. 6. Set your **state tax rate**. This varies by state from 0% in states with no income tax to over 13% in California. 7. Click **Calculate Tax Savings** to see your results, including a year-by-year breakdown and 5-year cumulative savings chart.
FAQs
Q: What is a cost segregation study? A: A cost segregation study is an engineering analysis performed by a qualified professional, typically a CPA firm with engineering expertise or a dedicated cost segregation firm. It identifies and documents which components of a building qualify for shorter depreciation lives under MACRS. The IRS requires engineering-quality documentation to support reclassification, which is why a formal study is needed rather than self-allocating costs.
Q: Can I do a cost segregation study on a property I already own? A: Yes. A look-back study allows property owners to claim missed accelerated depreciation on previously acquired properties. You can file IRS Form 3115 (Application for Change in Accounting Method) to claim the cumulative benefit in a single year without amending prior returns. This is one of the most powerful applications of cost segregation for existing property owners.
Q: How much does a cost segregation study cost? A: Study fees vary based on property type, size, age, and complexity. Most commercial properties valued at \$1 million to \$5 million will see study fees in the range of \$5,000 to \$15,000. Larger or more complex properties can be \$20,000 or more. Given that typical first-year savings often exceed the study fee many times over, most properties above \$500,000 in value will show a positive ROI.
Q: Are the results from this calculator guaranteed? A: No. This calculator provides estimates based on typical industry allocation percentages. Actual results from a formal cost segregation study will differ based on the specific property, construction type, component details, and year of construction. Always consult a qualified CPA or cost segregation specialist before making tax decisions. The IRS requires documentation to support any accelerated depreciation claimed.
Q: What is bonus depreciation and how does it affect my savings? A: Bonus depreciation under IRC Section 168(k) allows taxpayers to immediately deduct a percentage of the cost of qualifying assets in the year they are placed in service. For properties placed in service from 2018 through 2022, the bonus rate was 100%, meaning the entire 5-, 7-, and 15-year component basis could be deducted in year one. The rate phases down after 2022: 80% in 2023, 60% in 2024, 40% in 2025, and 20% in 2026. After 2026, bonus depreciation is scheduled to expire unless Congress extends it.
Q: Does cost segregation apply to residential rental properties? A: Yes, though residential rental properties typically yield slightly lower reclassification percentages than commercial properties because they have fewer short-lived components. Multifamily apartment buildings can still benefit significantly, especially if they include amenity spaces, landscaping, parking areas, or specialty systems that qualify for 5-year or 15-year treatment.
Q: Does this strategy affect my state taxes? A: Many states conform to federal depreciation rules, but some states including California and New Jersey do not allow bonus depreciation or have modified MACRS conformity. Consult a state tax advisor to understand the impact in your specific state.