Best Cost Segregation Study Providers for STR Investors in 2026
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A professional cost segregation study can accelerate tens of thousands of dollars in depreciation deductions into the first few years of ownership — potentially creating a large tax loss that offsets other income. For STR investors who qualify under the material participation rules, this is one of the most powerful tax strategies available. This guide compares the leading cost segregation providers, explains when a professional study makes economic sense, and covers a DIY alternative for smaller properties.
What Cost Segregation Does for STR Hosts
Standard depreciation depreciates a residential rental property over 27.5 years. A $400,000 building generates roughly $14,545 per year in depreciation deductions — spread over nearly three decades. Cost segregation accelerates this by reclassifying portions of the property into shorter depreciation classes:
- 5-year property: Furniture, appliances, carpeting, decorative lighting, some equipment
- 7-year property: Office furniture and fixtures
- 15-year property: Landscaping, parking areas, sidewalks, outdoor lighting, fencing
- 39-year property: Commercial building structure (not applicable for residential STR)
By reclassifying 20–40% of a property's cost into 5-year and 15-year categories, a cost segregation study can dramatically increase first-year depreciation deductions — especially when combined with bonus depreciation on qualifying property. For an STR host who materially participates, these deductions can directly offset W-2 income.
For a detailed overview of how cost segregation works for STR hosts, see our cost segregation beginner's guide.
A $750,000 STR property (with $600,000 building value) that undergoes cost segregation might reclassify $150,000 into 5-year property and $50,000 into 15-year property. With current bonus depreciation rates, this could generate $120,000+ in first-year deductions beyond standard depreciation. At a 32% combined federal/state marginal rate, that's potentially $38,000+ in year-one tax savings for a qualifying host.
Top Cost Segregation Providers Compared
| Provider | Price Range | Turnaround | Property Min. | STR Experience |
|---|---|---|---|---|
| KBKG | $5,000–$20,000+ | 4–8 weeks | $500K+ | Strong |
| Engineered Tax Services (ETS) | $4,500–$15,000 | 3–6 weeks | $500K+ | Strong |
| Cost Segregation Authority | $3,000–$12,000 | 3–5 weeks | $300K+ | Moderate |
| Madison SPECS | $4,000–$15,000 | 4–8 weeks | $500K+ | Moderate |
| Capstan Tax Strategies | $3,500–$12,000 | 3–6 weeks | $300K+ | Moderate |
Provider Profiles
KBKG
KBKG is one of the largest and most established cost segregation firms, with decades of experience and a track record of IRS-defensible studies. Their engineering-based approach includes actual site inspections and detailed asset classification at the component level. KBKG has experience with STR properties and understands the nuances of residential-use STR versus commercial STR.
Best for: High-value STR properties ($750K+) where study quality and IRS defensibility are paramount. Their studies tend to be at the higher end of the price range but are widely respected by CPAs and have a strong audit defense track record.
Engineered Tax Services (ETS)
ETS is a nationally recognized cost segregation firm that handles both residential and commercial properties. They have a strong reputation for STR properties specifically and work with many real estate-focused CPAs. Their studies are engineering-based with site inspections and are delivered in formats that work well with most tax software.
Best for: STR investors who want a nationally recognized firm with strong CPA relationships and good STR-specific experience. Turnaround is generally 3–6 weeks.
Cost Segregation Authority
Cost Segregation Authority has built a reputation for making cost segregation accessible to smaller property owners, with minimum property values as low as $300,000 in some cases. They offer both full engineering studies and lower-cost mini studies for smaller or simpler properties. Turnaround times are competitive.
Best for: STR investors with properties in the $300K–$750K range who want a professional study at a competitive price. Good option for first-time cost segregation buyers who want to understand the process.
Madison SPECS
Madison SPECS (formerly Madison Real Estate) is a well-regarded firm focused exclusively on cost segregation and related tax services. They work primarily with CPAs and tax advisors, so many STR investors come to them through their accountant. Their studies are engineering-based and IRS-defensible.
Best for: Hosts whose CPA already has a relationship with Madison SPECS. The CPA relationship model means you get a study that integrates well with your existing tax preparation workflow.
Capstan Tax Strategies
Capstan specializes in cost segregation and related tax strategies for real estate investors, with a particular focus on smaller and mid-size properties. They're known for detailed studies at competitive prices and work with both CPAs and direct investor clients. Property minimums are accessible at around $300K.
Best for: STR investors with properties in the $300K–$1M range who want an accessible minimum and detailed study quality. Good option for hosts managing their own tax strategy without a dedicated CPA relationship.
When a Professional Study Is Worth It
The general rule: a cost segregation study makes economic sense when the first-year tax savings from accelerated depreciation exceed the study cost by a meaningful margin — typically 2–5x the study fee.
| Property Value | Typical Study Cost | Estimated First-Year Benefit | Worth It? |
|---|---|---|---|
| Under $300K | $3,000–$5,000 | $3,000–$6,000 | Maybe — run the numbers |
| $300K–$750K | $3,500–$8,000 | $8,000–$25,000 | Usually yes |
| $750K–$2M | $7,000–$15,000 | $25,000–$75,000 | Yes, in most cases |
| $2M+ | $12,000–$25,000+ | $75,000+ | Yes |
A cost segregation study only creates immediate tax savings if you can deduct the resulting losses in the current year. For STR hosts, this requires material participation — typically 100+ hours in STR activities with more hours than any other person. Without material participation, cost seg losses may be suspended as passive activity losses. Confirm your participation status with your CPA before commissioning a study.
DIY Cost Segregation: When It Makes Sense
For properties under $500,000 in depreciable value, a simplified DIY cost segregation using IRS-approved methods can capture much of the benefit at minimal cost. This approach uses:
- The property appraisal or assessment records to identify the land-to-building ratio
- Component-level cost estimates based on actual purchase price allocations
- IRS Cost Segregation Audit Techniques Guide (ATG) classifications as reference
- Your CPA to review and apply the reclassification to your tax return
This approach won't capture everything a full engineering study would, but for a $400,000 property with straightforward improvements, it can still accelerate $30,000–$80,000 in depreciation into earlier years. DeductFlow can help you track the results of either approach — enter your reclassified asset values and it maintains the depreciation schedule going forward.
After the Study: Tracking Results in DeductFlow
Once your cost segregation study is complete, you'll have a detailed asset list with values assigned to each depreciation class. DeductFlow's asset tracking lets you enter these reclassified values, set the appropriate depreciation method for each class, and generate the depreciation schedule that supports your Form 4562. See our step-by-step guide to setting up cost segregation tracking in DeductFlow.
Track Your Cost Seg Results in DeductFlow
After your cost segregation study, DeductFlow tracks each asset class, generates depreciation schedules, and produces Form 4562 support for your CPA.
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Disclaimer
This article is for informational purposes and does not constitute tax, legal, or financial advice. Cost segregation is a complex tax strategy that depends on your specific property, tax situation, and material participation status. Provider pricing and turnaround times are estimates and subject to change. Always consult a qualified CPA or tax professional before commissioning a cost segregation study.