If you own a rental property placed in service after 1986, there is a good chance it qualifies for a cost segregation study. That includes single-family rentals, short-term rentals, multifamily properties, and commercial real estate.
For most owners, eligibility is the easy part. The better question is whether the expected tax benefit is large enough to justify the cost of the study.
What Makes a Property Eligible?
The basic requirements are fairly straightforward.
| Requirement | What It Means |
|---|---|
| Placed in service after 1986 | Property acquired or converted to rental use since 1986 can qualify. There is no cutoff based simply on how long ago you bought it. |
| Held to produce income | This includes traditional rentals, short-term rentals such as Airbnb or VRBO properties, buy-and-hold investments, BRRRR properties, and house hacks with rented units. |
| You pay federal income tax | Cost segregation accelerates depreciation deductions. The value depends on whether those deductions can actually reduce taxable income. |
| You have depreciable basis | Land does not depreciate. The building and qualifying components do. For planning purposes, depreciable basis is often estimated at about 80% of purchase price after allocating value to land. |
| You bought the property years ago | You may still qualify. A Form 3115 accounting-method change can allow missed depreciation to be addressed without amending prior-year tax returns. |
Owning an older rental does not automatically put cost segregation off the table. In some cases, the look-back opportunity is where much of the benefit comes from.
What a $400,000 Depreciable Basis Could Look Like
Take a property purchased for approximately $500,000. Using an 80% planning assumption for depreciable basis gives us $400,000 of building basis after removing land.
Now apply a conservative 25% reclassification assumption.
| Step | Figure | How We Get There |
|---|---|---|
| Property purchase price | ~$500,000 | Starting purchase price |
| Depreciable basis | $400,000 | Approximately 80% of purchase price after estimated land allocation |
| Reclassified to shorter-life assets | $100,000 | 25% of depreciable basis moved into 5-year, 7-year, and 15-year property |
| Estimated first-year tax savings | ~$35,000 | Assumes the qualifying $100,000 is eligible for 100% additional first-year depreciation and is multiplied by a 35% marginal tax rate |
| Basis study fee | $1,795 | Report-specific audit support is included. Optional services such as look-back or renovation analysis are priced separately. |
| Estimated first-year ROI | ~19.5x | $35,000 divided by $1,795 |
In this example, the $100,000 reclassified into qualifying 5-year, 7-year, and 15-year assets can potentially be deducted in the first year rather than depreciated over those shorter recovery periods.
The 80% basis allocation, 25% reclassification rate, and 35% marginal tax rate are planning assumptions. Actual results depend on the property, its documentation, the acquisition and placed-in-service dates, and the owner's tax situation.
Short-Term Rental Owners Have One Extra Question
Short-term rentals can qualify for cost segregation. But there is another issue to resolve first. The building itself may be depreciated over 27.5 years or 39 years.
That determination depends on specific tax rules and the property's actual use. It is not determined simply by whether you advertise the property on Airbnb or VRBO.
We cover that question separately in Is your short-term rental depreciated over 27.5 or 39 years?.
Either classification can still support a cost segregation study. The classification changes the depreciation calculation.
When Cost Segregation May Not Be Worth It
A property can qualify technically and still be a poor candidate financially.
Depreciable basis is too small
Once depreciable basis falls below roughly $100,000, the projected tax savings can start getting too close to the $1,795 study fee. At that point, the economics get thin.
You cannot use the deduction
A large depreciation deduction has less immediate value if you do not have taxable income it can offset. Passive activity loss limitations can also cause deductions to be carried forward rather than used immediately.
The deduction may still have value. The timing changes.
You plan to sell soon
Accelerating depreciation today can increase depreciation recapture when the property is sold. If you expect to sell within the next year or two, that shorter holding period needs to be part of the analysis.
The property is purely personal use
Your primary residence does not qualify simply because you own real estate. The property must have depreciable business or rental use.
Most of the basis has already been depreciated
A property late in its depreciation schedule may have less remaining basis available to reclassify. There can still be an opportunity, but the numbers need to support it.
What About Audit Risk?
Cost segregation does not eliminate the need for documentation. The study should be able to show how assets were identified, classified, valued, and assigned to their appropriate depreciation lives.
Every Basis cost segregation study includes report-specific audit support in the base fee. If the IRS asks how the classifications were determined, you have the supporting study and documentation available.
The Basis 5x Check
We use a simple internal benchmark. If your projected first-year tax savings do not equal at least five times the $1,795 base study fee, we show you the numbers before you pay for the study.
For example, the calculation is shown below.
5 x $1,795 = $8,975
If the estimated first-year benefit is only $5,000 or $6,000, you should know that before ordering a study.
In the $400,000 depreciable-basis example above, the estimated $35,000 benefit is well above that benchmark.
The 5x check is not an eligibility requirement. We do not reject a property simply because it falls below the threshold. It is a decision tool.
You see the expected benefit and the cost side by side. Then you decide whether the study makes sense.
Not Sure? Run the Numbers First
You do not need to buy a cost segregation study to find out whether one is likely to make financial sense.
The Basis intake begins with a free eligibility and benefit screen. Enter the property details, purchase price, and acquisition information. The process takes about ten minutes.
You will see the estimated tax benefit next to the $1,795 study fee before deciding whether to move forward.
© 2026 Basis Cost Seg. For informational purposes only and not tax or legal advice. Benefit estimates use stated planning assumptions, including an 80% basis allocation, 25% reclassification rate, and 35% tax rate. The $35,000 first-year savings example assumes the reclassified property qualifies for 100% additional first-year depreciation. Actual results vary by property and taxpayer. Consult a qualified tax professional.
Further reading
- IRS Publication 946, How To Depreciate Property Federal guidance on depreciation methods, recovery periods, and additional first-year depreciation.
- IRS Cost Segregation Audit Technique Guide, Publication 5653 IRS examination guidance for cost segregation studies.
- IRS Form 3115, Application for Change in Accounting Method The current IRS form and instructions page for accounting-method changes.
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