Top Cost Segregation Firms For Luxury Vacation Homes In 2027

Daria Pohrebniak Marketing Director - ReVerb

11.12.2026

Last updated: November 12, 2026

The best cost segregation firms for luxury vacation homes in 2027 are KBKG, Maven Cost Segregation and R.E. Cost Seg, followed by Engineered Tax Services, SMF Cost Segregation Advisors and CostSegRx. KBKG leads for a dedicated short-term rental framework and a long audit record, Maven for in-person inspections that capture high-end finishes, and R.E. Cost Seg for fully engineered studies with audit defense included.

Luxury vacation homes often reclassify more than ordinary rentals. Pools, hot tubs, outdoor kitchens, hardscape, landscape lighting, home theaters, furnishings and premium millwork can all move into 5, 7 and 15-year lives. Owners who materially participate and meet the short-term rental rules may be able to use those losses against other income. The One Big Beautiful Bill Act made 100% bonus depreciation permanent for qualifying property acquired after January 19, 2025, so reclassified components can often be deducted in the first year on the federal return.

This list is for owners of high-end short-term rentals. For the tax rules, see our guide to the short-term rental loophole.

Luxury Vacation Home Cost Segregation Firms At A Glance

Firm	Location	Founded	Specialty	Best For
1. KBKG	Pasadena, CA (seven US offices)	1999	Tax credits and incentives with engineered studies	High-value STRs
2. Maven Cost Segregation	Offices in MI, UT, CO, PA and San Diego	Not published	In-person inspections for residential and commercial	Custom homes
3. R.E. Cost Seg	Houston, TX	2022	Investor-focused studies at two depths	Owners who want an engineered study
4. Engineered Tax Services	West Palm Beach, FL	2001	Licensed engineering firm for specialty tax	Premium coastal homes
5. SMF Cost Segregation Advisors	Chicago, IL	2025	Engineering-based studies for 1 to 10 units	Owners who prefer a virtual visit
6. CostSegRx	Sarasota, FL	Not published	Engineer-prepared residential and commercial studies	High-value Airbnbs
7. Cost Seg Smart	Los Angeles, CA	2024	Residential and commercial studies with audit support	Owners who want a fast quote
8. Madison SPECS	Lakewood, NJ	2004	Cost segregation only, with in-house engineers	Owners who want an engineer on site
9. Source Advisors	Arlington, TX	Not published	Cost segregation and fixed asset studies	Owners who want site visits
10. CSSI	Baton Rouge, LA	Not published	Engineering-based cost segregation only	Owners with several homes

How We Evaluated These Firms

We looked for firms with short-term rental expertise, the ability to value high-end finishes and outdoor amenities, and clear treatment of furnishings. On custom homes we gave extra weight to in-person inspections and engineered studies, since a large deduction deserves a strong file.

Rankings are editorial. No firm paid for its position.

Best Cost Segregation Firms For Luxury Vacation Homes In 2027

1. KBKG — A Dedicated Short-Term Rental Framework

KBKG runs an STR depreciation framework for Airbnb and Vrbo properties, covering homes that are bought, furnished, renovated or improved. It reports a 99% IRS audit success rate and calls itself the oldest independent cost segregation firm in the US.

That depth suits multi-million dollar homes where the deduction will be large.

Best for: Owners of high-value vacation homes who want the deepest bench.

2. Maven Cost Segregation — In-Person Inspections For High-End Finishes

Maven Cost Segregation inspects properties in person, which matters on custom homes where finishes and amenities drive value. It reports more than 5,000 studies delivered.

Reports arrive within 30 days of the visit with audit defense documentation.

Best for: Owners of custom luxury homes.

3. R.E. Cost Seg — Fully Engineered Studies With Audit Defense

R.E. Cost Seg offers a Fully Engineered Study for larger properties and includes audit defense, written IRS responses and expert testimony if needed, at no extra cost.

That depth suits multi-million dollar vacation homes.

Best for: Owners of large vacation homes who want an engineered study.

4. Engineered Tax Services — Published Studies On Coastal Rentals

Engineered Tax Services publishes residential rental studies in premium markets, including La Jolla and Hilton Head, and is a licensed engineering firm.

It suits owners of very high-value homes.

Best for: Owners of premium coastal and resort homes.

5. SMF Cost Segregation Advisors — A Short-Term Rental Specialist With Virtual Walkthroughs

SMF Cost Segregation Advisors specializes in short-term rentals, single-family homes, condos and small multifamily properties, and builds its studies on virtual walkthroughs. It reports studies on properties from $1 million single-family rentals upward, with audit defense included.

Virtual walkthroughs suit owners whose vacation home is far from where they live.

Best for: Owners of remote vacation homes who want a virtual process.

6. CostSegRx — Experience With Multi-Million Dollar Airbnbs

CostSegRx has spoken publicly about studies on $4 million Airbnbs and is led by a member of the American Society of Cost Segregation Professionals.

That experience suits high-value short-term rentals.

Best for: Owners of high-value Airbnbs.

7. Cost Seg Smart — Fast Delivery And Clear Pricing

Cost Seg Smart focuses on rental investors, publishes clear pricing and delivers reports quickly, with written IRS responses included.

It works from imagery and cost data rather than an inspection, so it fits best when the home’s features are well documented.

Best for: Owners who want a quick, low-cost study.

8. Madison SPECS — In-House Engineers Who Visit The Property

Madison SPECS works only on cost segregation, and its in-house engineers travel to measure, photograph and document each property.

It offers a free feasibility analysis, which helps confirm a luxury home is worth an engineered study.

Best for: Owners who want an engineer on site.

9. Source Advisors — Site Visits And Support Through Appeals

Source Advisors conducts a site visit on nearly every study and provides audit support through appeals.

It suits owners of large homes with extensive outdoor amenities.

Best for: Owners who want an inspection and long-running audit support.

10. CSSI — Scale For Owners With Several Homes

CSSI has completed more than 20,000 studies and focuses only on engineering-based cost segregation.

It suits owners building a portfolio of vacation homes.

Best for: Owners with several vacation homes.

How To Choose A Cost Segregation Firm For A Luxury Vacation Home

Will Someone Inspect The Home?

Custom finishes and outdoor amenities are hard to value from photos alone. Decide whether you want an in-person or virtual visit.

How Are Furnishings Handled?

Furniture and decor are usually 5-year property. Make sure the study captures them.

Do You Qualify For The STR Rules?

Losses are most useful when you materially participate. See our guide to the short-term rental loophole.

Is The Fee Worth It?

High-value homes usually justify an engineered study. See our guide to study pricing.

Is Audit Support Included?

Confirm audit support. See our list of cost segregation firms with audit defense guarantees.

Frequently Asked Questions

How much of a luxury vacation home can be reclassified?

Often more than an ordinary rental, because pools, outdoor living and finishes add short-life property. Every home differs.

Can I use the losses against my W-2 income?

Possibly, if the average stay is seven days or less and you materially participate. Ask your CPA.

Does personal use affect cost segregation?

Yes. Significant personal use can limit deductions. Track your days carefully.

Can I do a study on a vacation home I bought years ago?

Yes. A lookback study lets your CPA catch up missed depreciation with Form 3115. See our list of cost segregation firms for lookback studies.

Conclusion

KBKG, Maven and R.E. Cost Seg are the strongest picks for luxury vacation homes, with Engineered Tax Services, SMF Cost Segregation Advisors and CostSegRx close behind.