Does Cost Segregation Work on a Single-Family Rental House?

How cost segregation works on a house you rent out

A cost segregation study looks at a rental house the same way it looks at a warehouse or a medical clinic: it separates the building into the parts that are genuinely structural, the foundation, framing, roof deck, from the parts that were never built to last 27.5 years, the standard depreciation life for residential rental property. Carpet and most flooring, kitchen cabinets, appliances, decorative lighting, fencing, and the driveway all get pulled out of that long schedule and reclassified into 5-, 7-, or 15-year buckets under the method described in the IRS's own Audit Techniques Guide (Pub 5653). Property in those shorter buckets qualifies for 100% bonus depreciation under current law for property acquired after January 19, 2025, meaning the reclassified amount can be deducted in year one instead of trickling out over decades.

The house does not need to be large or expensive for this to work. It needs real components, a kitchen, floors, exterior finishes, that a study can separate out and assign a shorter life to.

One delivered study on a single-family rental

Basis delivered a study on a single-family rental in Montgomery County, Pennsylvania, built in 2013, 4,946 square feet. Here is what the engineering review found.

That ratio runs high because the fee for a residential study is small relative to the deduction the mechanics produce, not because this house is unusual. Every number in that table came from a real, delivered study, not a projection.

Where the accelerated dollars come from in a house

In a typical single-family rental, the accelerated basis breaks down across a familiar list:

• 5-year property: carpet and most flooring, cabinetry, appliances, decorative lighting, window treatments, and certain electrical and plumbing that serves specific equipment rather than the building itself.
• 7-year property: certain fixtures and furniture, when the rental is furnished.
• 15-year land improvements: the driveway or parking pad, fencing, landscaping, exterior lighting, and any patio or deck sitting on grade.
• 39/27.5-year structural: the foundation, framing, roof structure, and central HVAC. A common misconception treats a roof or a central HVAC system as fast-depreciating equipment. Both stay on the long schedule; they are structural, not personal property.

A duplex or fourplex carries a version of this same list, scaled to how many units the owner actually holds. On the Montgomery County house above, the $160,242 identified as accelerated basis is the sum of exactly this list, priced against that specific house's actual finishes, not a percentage pulled from a rule of thumb.

Long-term or short-term changes what happens to the deduction

The engineering mechanics are identical whether the house is rented by the year or by the week. What changes is which set of tax rules governs the losses the deduction can create. A house rented under a standard lease is a rental activity under section 469, and losses from it are passive by default, meaning they can only offset passive income unless the owner qualifies as a real estate professional (750-plus hours and more than half of working time in real property trades, with material participation in the rentals) or the activity qualifies as non-passive some other way.

A house whose average guest stay is 7 days or less can instead fall under the short-term rental exception in Reg. 1.469-1T(e)(3)(ii), which takes it out of the section 469 rental-activity definition entirely. From there, the owner still needs material participation, commonly measured by 500-plus hours, substantially all the participation, or 100-plus hours and more than any other individual, including a co-host or cleaner, for losses to be non-passive. Whether either path fits a given house is a fact question for that owner's CPA. What the estimate and the delivered study above show is the number the mechanics produce on the building itself.

Why a single house fits the hands-off process

Residential studies do not require a site visit or an owner homework list. The listing photos, the same photos used on Airbnb or VRBO for a short-term rental, or simple interior photos for a long-term lease, feed the component classification our engineering team runs. That is a real difference from a commercial building, where an engineer typically walks the site. A house is small enough, and photographed thoroughly enough, that photos alone carry the study.

Turnaround runs 4 to 6 weeks during tax season, typically 2 to 3 weeks in January and February. A study on a house owned for years works through Form 3115 (automatic consent, no amended returns), with the missed depreciation arriving as a single section 481(a) catch-up deduction in the current year, the mechanism behind a look-back study.

How a house's ratio stacks up, and what happens if it's questioned later

A house study runs on a much smaller basis than a commercial building, so it is worth seeing both ends of the range side by side. A real medical clinic study, engineered, not software-only, had a $1,404,500 building basis and produced $241,839 in first-year deductions on a $10,000 fee, roughly 24.2 to 1. The Montgomery County house above had a basis of $1,040,000, close in size, and produced $174,905 on a $1,295 fee, roughly 135 to 1. The dollar deduction is smaller on the house, because a house simply has fewer components than a clinic's mechanical and electrical systems. The ratio is bigger on the house because the fee for a residential engineering scope is a fraction of a commercial one.

Neither number is the point on its own; both show the same mechanic at different scales, a fixed, scope-based fee against a variable deduction. And neither study is a gray-area position: the method follows the IRS's own Audit Techniques Guide, and the underlying reclassification approach has been settled law since the IRS lost Hospital Corporation of America v. Commissioner (109 T.C. 21, 1997). If an examiner questions a delivered study years later, Basis provides full audit defense of the report, the engineers who built the classification answer the technical questions directly, while the owner's own CPA continues to represent the owner and handle the return.

Getting a number for your house

Every study is custom-priced. The $1,295 fee above is one real quote, not a rate card, and a different house, different square footage, age, finish level, will price differently. A free Preliminary Benefit Estimate models the likely first-year number for a specific house before anyone spends anything. The 60-second qualifier at /qualify starts it.

Frequently asked questions

Is cost segregation worth it on a single rental house?

Depends on the basis and the fee together. On one delivered single-family rental study, a $1,295 fee produced an estimated $174,905 in first-year depreciation, a strong multiple on a small fee. A free estimate at /qualify models the likely number for a specific house before any commitment.

How much does a cost segregation study cost on a house?

Every study is custom-priced; there is no flat fee or rate card. Recent residential fees have run in the low thousands, illustrated by a real $1,295 quote on a 4,946 square foot rental. Building size, age, and finish level all move the number.

Do the engineers need to visit the house?

No. Residential studies run on listing or interior photos alone, the same photos used on Airbnb or VRBO for a short-term rental. There is no site visit and no homework list for the owner.

Can a study run on a house I've owned for years?

Yes. A look-back study uses Form 3115 with automatic consent, so no amended returns are needed. The depreciation the house should have claimed in prior years arrives as one section 481(a) catch-up deduction in the current year.

Does the deduction lower what I owe this year?

That depends on whether the rental's losses are passive under section 469 and whether the owner meets a real estate professional test or the short-term rental material participation test. The study produces the deduction; whether it offsets other income is a question for the owner's CPA.