Cost Segregation Calculator for FREE: Estimate Your 2026 Depreciation & Tax Savings
This free cost segregation calculator estimates how much first-year depreciation a cost segregation study could unlock on your rental property and what that deduction may be worth in federal tax savings. Enter your depreciable basis, placed-in-service date, tax rate, and lease type to compare accelerated depreciation against straight-line and decide whether a full study is worth ordering.
The calculator is preloaded with a $500,000 long-term single-family rental placed in service January 15, 2025, at a 37% federal tax rate. Because that date falls before the One Big Beautiful Bill Act (OBBBA) cutoff, the example follows the earlier TCJA bonus depreciation phase-down.
As of 2026, qualified property acquired and placed in service after January 19, 2025 generally qualifies for 100% bonus depreciation, so change the date to model a newer purchase.
Estimates draw on allocation benchmarks from Maven's 5,000+ completed engineering studies and are not a substitute for a property-specific study.
Preloaded example: $500,000 Single-Family Rental, long-term lease, placed in service January 15, 2025, 37% federal bracket.
Depreciation Over The Year
Year 1 Estimated Depreciation Expense: $78,437
Year 1 Potential Tax Savings at a 37% Income Tax Rate: $18,483
Study Impact
$49,953
Est. Tax Savings
$18,483
With vs Without
$78,437 vs $28,484
Worked Example: $500,000 Single-Family Rental
The calculator above is preloaded with a $500,000 depreciable basis on a long-term single-family rental placed in service January 15, 2025, at a 37% federal tax rate. That date is before the OBBBA 100% bonus cutoff (after January 19, 2025), so the snapshot follows the earlier phase-down. Using typical SFR reallocations in Maven’s 15–25% benchmark band (13% five-year personal property, 10% fifteen-year site improvements, 77% 27.5-year real property), the estimate shows:
- Year 1 depreciation with a cost segregation study: $78,437
- Year 1 depreciation without a study (straight-line): $28,484
- Incremental study impact: $49,953
- Estimated first-year tax savings at 37%: $18,483
These figures are an illustration, not a filed depreciation schedule. To model 100% bonus depreciation under 2026 law, set the placed-in-service date to after January 19, 2025. Actual results depend on a property-specific engineering study.
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How Much Can You Save With a Cost Segregation Study?
Savings depend on four variables: your depreciable basis, how much of the building a study reclassifies into shorter-life property, the bonus depreciation rate that applies to your acquisition and placed-in-service dates, and your tax rate. Across Maven's completed studies, typical reclassification runs 15–25% of basis for single-family rentals and 25–35% for commercial buildings. Whether you can use the deduction this year also depends on the passive activity rules.
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Why Use This Cost Segregation Calculator?
What Is a Cost Segregation Calculator?A cost segregation calculator estimates how a study would split your property's depreciable basis between long-life real property (27.5 years for residential rentals, 39 years for nonresidential) and shorter-life property such as appliances, flooring, and site improvements. It then compares first-year depreciation under that split against straight-line depreciation with no study. Maven's calculator bases its allocations on typical reclassification rates from 5,000+ completed engineering studies.
Investors use it to:
How Accurate Is a Free Cost Segregation Calculator?It's accurate enough to tell you whether a study is worth pursuing, not accurate enough to file. The calculator applies typical allocation percentages to your basis, while a real study measures your building's actual components. Two properties with the same purchase price can reclassify very differently depending on age, finishes, renovations, and site work. Treat the output as a directional estimate, not a number for your return.
Factors that move your actual result away from the estimate:
- Land value. Land isn't depreciable, so the land allocation you use directly changes your depreciable basis.
- Building components. Custom finishes, extensive site work, or a recent renovation can push reclassification above the benchmark range; a basic property may land below it.
- Acquisition date. The calculator asks for a placed-in-service date, but 100% bonus depreciation requires qualified property to be both acquired and placed in service after January 19, 2025.
- Your ability to use the deduction. The estimate shows federal tax savings only and doesn't reflect passive activity limits or state income tax.
Cost Segregation Calculator vs. Full Engineering Study
For a deeper understanding of how cost segregation works step by step, check out our detailed guide here. By using this residential cost segregation calculator, investors can gain a better understanding of their potential tax savings and make informed decisions about whether a full study is worth pursuing.
How to Use the Real Estate Cost Segregation Calculator
The cost segregation real estate calculator on Maven Cost Segregation’s website is designed to be straight forward while still giving insight into the complexities of your specific scenario. Make sure to fill in all the proper details to get an accurate estimate.
Step 1: Access the Calculator
Navigate to the cost segregation calculator on our website. The tool is available for free and requires no signup or payment to generate an initial depreciation estimate.
Step 2: Enter Key Property Details
To ensure the most accurate estimate, you’ll need to input the following details:
- Property Type
Choose from residential, commercial, self-storage, or other investment property types. The classification affects depreciation schedules and asset allocations.
- Asset Class
Select the specific category of your property, such as a single-family home, condo, multifamily building, or office space. Asset class distinctions are important for IRS depreciation rules.
- Depreciable Basis
Enter the amount subject to depreciation. This is calculated as:
- Acquisition price (excluding land value)
- Plus any capital improvements (rehab costs that qualify as capital expenditures)
- Minus land value, since land itself is non-depreciable
- Placed in Service Date
The date the property was first made available for rent, not necessarily the purchase date. This is typically when the property was listed as available to tenants. Under current 2026 law, qualified property acquired and placed in service after January 19, 2025 generally qualifies for 100% bonus depreciation (OBBBA / IRS Notice 2026-11). Dates on or before January 19, 2025 follow the earlier TCJA phase-down.
- Federal Tax Rate
Select your applicable income tax rate. If unsure, refer to prior tax returns or consult with a CPA. This determines your estimated tax savings from accelerated depreciation.
- Lease Type
Choose between short-term or long-term rental. This affects the depreciation schedule, as short-term rentals are classified as non-residential and depreciate over 39 years, whereas long-term residential properties follow a 27.5-year depreciation schedule.
Step 3: Generate Calculation
Click the “Generate Calculation” button and the tool will display an estimate of your depreciation benefits. While this free cost segregation calculator provides a helpful projection, actual depreciation benefits require a detailed engineering study to ensure IRS compliance and maximum tax advantages.
For more insights into real estate tax strategies, check out our guide on how to unlock massive tax benefits with Real Estate Professional Status (REPS).
Cost Segregation Calculator Methodology & IRS Citations
Estimates follow the Modified Accelerated Cost Recovery System (MACRS) in IRC §168. Residential rental real property uses a 27.5-year recovery period; nonresidential real property uses 39 years. Personal property and land improvements identified in a cost segregation study are generally recovered over 5 and 15 years and may qualify for bonus depreciation under IRC §168(k).
Land is excluded from depreciable basis. Recovery-period definitions and conventions are described in IRS Publication 946, How to Depreciate Property. The IRS discusses acceptable cost segregation methods in its Cost Segregation Audit Techniques Guide.
Bonus depreciation after the One Big Beautiful Bill Act is addressed in IRS Notice 2026-11 (interim guidance on the permanent 100% additional first-year depreciation deduction for qualified property acquired after January 19, 2025). See also our explainer on IRS Notice 2026-11 and OBBBA bonus depreciation. This calculator uses typical percentage allocations from Maven studies; it is not a substitute for an engineering-based study.
Using This Calculator for STR Cost Segregation and Bonus Depreciation
Bonus depreciation (the additional first-year deduction under IRC §168(k)) lets owners deduct a large share of eligible 5- and 15-year property in year one instead of spreading it over the recovery period.
After January 19, 2025: The One Big Beautiful Bill Act (OBBBA) generally allows a permanent 100% bonus for qualified property acquired and placed in service after this date. IRS Notice 2026-11 is the IRS’s interim guidance on those rules, including how to apply existing Treas. Reg. §1.168(k)-2 with updated dates.
On or before January 19, 2025: Property remains under the earlier Tax Cuts and Jobs Act phase-down-for example, 60% bonus in calendar year 2024 and 40% for most 2025 property placed in service through January 19. Enter your actual placed-in-service date so the estimate uses the correct bonus percentage.
Recovery periods and MACRS conventions are in IRS Publication 946. For a walkthrough of the notice, read IRS Notice 2026-11 and how OBBBA affects 100% bonus depreciation.
Cost Segregation Studies: How Accelerated Depreciation Affects First-Year Deductions
A key benefit of cost segregation is the immediate tax impact. In the preloaded $500,000 single-family example at a 37% tax bracket, first-year depreciation with a study is $78,437 versus $28,484 without a study-about $18,483 of estimated federal tax savings. Those dollars can be reinvested into additional properties, improvements, or other priorities. Change the placed-in-service date to after January 19, 2025 to model 100% bonus under OBBBA.
The Advantage of Upfront Depreciation in Cost Segregation
A fundamental principle of cost segregation is the time value of money-a dollar saved today is worth more than a dollar saved 10 or 20 years from now. By accelerating depreciation deductions, investors can:
- Reduce taxable income in early ownership years, when cash flow is often most critical.
- Reinvest tax savings into additional properties or improvements.
- Maximize financial flexibility rather than waiting decades for the same deductions.
For a deeper dive into how cost segregation works in real-world scenarios, take a look at our case studies on cost segregation benefits to see how investors have used these strategies to reduce their tax burden.
Adjusting Your Cost Segregation for Short-Term Rentals vs. Long-Term Rentals
One of the most important factors in a cost segregation study calculator is determining whether your property qualifies as a long-term rental or a short-term rental, as this classification affects the depreciation schedule and potential tax benefits.
Long-Term Rentals: 27.5-Year Depreciation Schedule
For residential rental properties leased on a long-term basis (typically leases exceeding 30 days), the IRS assigns a 27.5-year depreciation period. This means:
- The structural components of the property depreciate evenly over 27.5 years.
- Without a cost segregation study, all assets would follow this schedule, resulting in lower annual deductions.
- With a study, certain components (like flooring, cabinetry, and land improvements) may qualify for 5-year and 15-year depreciation schedules, allowing for accelerated deductions.
Short-Term Rentals: 39-Year Depreciation Schedule
Properties used as short-term rentals (STRs) -typically those rented for an average stay of less than 30 days per guest-are classified by the IRS as non-residential real estate. This means:
- The default depreciation schedule is 39 years, rather than 27.5 years.
- Structural components depreciate over a longer period, reducing annual deductions.
- A cost segregation study becomes even more critical for STR investors, as reallocating assets into shorter life classes (5-year, 15-year) can help offset the longer structural depreciation period.
Tax Strategy Considerations for Short-Term Rentals
While STRs have a longer depreciation schedule, they also offer unique tax advantages, particularly through the short-term rental loophole. Under certain conditions, STR owners may be able to:
- Avoid passive activity loss limitations, allowing them to use depreciation deductions against W-2 or active income.
- Increase tax deductions by applying cost segregation to offset rental income in the early years of ownership.
- Combine cost segregation with material participation rules to qualify for additional tax benefits.
Investors using the free cost segregation calculator should carefully consider their rental strategy and depreciation method, as long-term vs. short-term classification significantly impacts tax planning. For a more detailed breakdown, a full cost segregation study can ensure maximum tax efficiency based on IRS regulations and individual investment goals. You can also check our blog about Overlooked Financial Benefits for Real Estate Investors.
Cost Segregation Calculator FAQ
- How does this cost segregation calculator estimate tax savings?
- The calculator applies typical life-class allocations-informed by Maven's 5,000+ completed engineering studies-to your depreciable basis, then compares MACRS accelerated depreciation (with a cost segregation study) against straight-line depreciation without a study. Estimated tax savings equal the first-year study impact multiplied by the federal tax rate you select.
- Is this calculator the same as an IRS-compliant cost segregation study?
- No. This tool provides a data-driven estimate based on typical reclassification ranges. A full cost segregation study is an engineering-based analysis of your specific property that produces IRS-compliant depreciation schedules. Use the calculator to size the opportunity; use a study to claim deductions.
- What is depreciable basis in this calculator?
- Depreciable basis is the amount subject to depreciation: acquisition price plus qualifying capital improvements, minus land value. Land itself is non-depreciable under IRS rules. See IRS Publication 946, How to Depreciate Property.
- Why do long-term and short-term rentals use different depreciation schedules?
- The IRS assigns residential rental real property a 27.5-year recovery period (IRC §168). Short-term rentals with an average stay under 30 days are generally classified as nonresidential real property and depreciate over 39 years. Cost segregation can reclassify personal property and land improvements into 5- and 15-year lives in either case.
- Does bonus depreciation change if my property was placed in service before January 20, 2025?
- Yes. Under the One Big Beautiful Bill Act (OBBBA), qualified property acquired and placed in service after January 19, 2025 generally qualifies for a permanent 100% additional first-year (bonus) depreciation deduction under IRC §168(k). IRS Notice 2026-11 provides interim IRS guidance on those rules. Property placed in service on or before January 19, 2025 remains under the earlier Tax Cuts and Jobs Act phase-down (for example, 60% bonus for calendar year 2024 and 40% for most 2025 property through January 19). Change the calculator's placed-in-service date to match your property.
- Where can I read the IRS rules this calculator follows?
- MACRS recovery periods and conventions are described in IRS Publication 946, How to Depreciate Property. Bonus depreciation after the OBBBA is addressed in IRS Notice 2026-11. Cost segregation methods are discussed in the IRS Cost Segregation Audit Techniques Guide. This calculator is an estimate, not a filed depreciation schedule.
- Can I use these calculator figures on my tax return?
- No. The figures are illustrative only and are not tax advice. Claiming accelerated depreciation requires a detailed engineering-based cost segregation study and, for a method change, may involve IRS Form 3115.
Next Steps: Get a Customized Cost Segregation Proposal
The cost segregation real estate calculator provides a useful estimate, but for a detailed and IRS-compliant analysis, a full cost segregation study is necessary. Our team at Maven Cost Segregation specializes in engineering-based studies that maximize your tax savings while ensuring full compliance.
How to Get a Free Proposal:
- Fill out a quick form with property details, purchase price, and rehab costs.
- Upload any supporting documents (e.g., Zillow/Redfin listings, property photos, Google Drive files).
- Schedule a free consultation-we’ll provide a detailed depreciation breakdown and estimated tax savings.
For questions or assistance, contact us directly-we’re here to help you make the most of your investment.
// founder
Sean Graham, CPA
Sean specializes in cost segregation, tax depreciation, and real estate tax savings. As the CPA and founder of Maven Cost Segregation: Tax Advisors, he has overseen 5,000+ engineering-based studies. This calculator page and its methodology notes were reviewed for accuracy against current IRS depreciation guidance, including IRS Publication 946 and IRS Notice 2026-11.
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