Is cost segregation worth it for a small rental? It depends on five things, and for many small rentals the answer is no. A study is most likely to pay when the building is worth a lot and you can use the extra loss now. It also helps to plan on keeping the property for years.
The other two are timing and the fee. Work through all five before you pay for one.
What a cost segregation study does
When you own a rental house, you cannot deduct what you paid for it all at once. You deduct it a little each year, and that yearly deduction is called depreciation.
For a residential rental building, the IRS spreads it over 27.5 years [1]. Land is left out, because land does not wear out [1].
But a rental is not just one big thing. It also holds items that wear out faster. Appliances, carpets and furniture in a rental are 5-year property [1]. Some improvements to the land, such as fences, sidewalks and shrubs, are 15-year property [1].
A cost segregation study is a detailed report that splits the price of your property into those groups. The faster groups get deducted sooner.
You do not get more depreciation in total. You get the deductions sooner, not more of them.
A simple example with made-up numbers
Say you buy a rental for $400,000, and $80,000 of that is the land. That leaves $320,000 for the building. Spread over 27.5 years, that is about $11,600 of depreciation a year.
Now say a study finds that $50,000 of the $320,000 is carpets, appliances and outside work like the fence and the driveway. Those parts move to the 5-year and 15-year groups.
These numbers are invented to show the idea. A real study could find more or less.
Here is where the 2025 tax law matters. If you acquired the property after January 19, 2025, those faster parts may qualify for a 100% special depreciation allowance [1][2]. People often call this bonus depreciation. It covers parts with a tax life of 20 years or less, like carpets and fences [1]. You deduct their full cost in the first year, unless you choose not to take it [1].
In this example, that could mean deducting about $50,000 in year one. The other $270,000 of the building is still spread over 27.5 years, which is under $9,800 a year. So is cost segregation worth it here? A deduction that size only helps if you can actually use it.
Is cost segregation worth it? Five questions decide
1. Is the building value large enough?
The study has a fee. The extra deduction it creates has to beat that fee by a clear margin.
Land does not count, so look at the building value, not the price. A $250,000 house where the land is worth $100,000 leaves only $150,000 to work with. Ask for a written quote and an estimate of the faster deductions before you commit.
2. Can you use a big loss this year?
For many small landlords, this question decides it. Rental income is usually passive income. That means money from an activity you do not work in day to day, like most rentals. A passive loss generally cannot reduce your wages or business income [3].
There is one important exception. If you actively take part in running the rental, you can deduct up to $25,000 of rental loss against your other income [3]. The limit is lower if you are married and file separately [3]. Active participation is a lower bar than working in the rental full time. Approving tenants and setting the rent can count [3].
That $25,000 shrinks as your income rises. For every $2 your income goes over $100,000, you lose $1 of the allowance. At $150,000 or more, it is generally gone [3]. The income used here is modified adjusted gross income. That is your adjusted gross income figured without a few items, such as IRA deductions and passive rental losses [3].
So a landlord earning $180,000 in wages may get a large loss on paper from a study. That landlord may still not be able to use it this year.
The loss is not lost, because it carries forward.
Unused losses are generally allowed in full in the year you sell your entire interest in the rental. The sale must be fully taxable and to someone not related to you [3]. But a deduction you can only use years from now is worth much less than one you use today. For high earners, a study usually helps sooner only if they have other passive income to offset [3].
3. How long will you keep the property?
Faster depreciation now can mean more tax when you sell. When you sell a part you depreciated, the gain on it is generally taxed as ordinary income, up to the depreciation you took on it [1]. Ordinary income is taxed at the same rates as your wages. On the building itself, the part of your gain that comes from past depreciation is taxed at up to 25% [4].
Plan to sell in two or three years? Then much of the benefit can come back as tax at the sale. Holding for many years lets you use the money you saved for longer, so a long hold tilts the math in favor of a study.
4. When did you buy it, and is it ready to rent?
The 100% rule covers parts acquired after January 19, 2025 and placed in service after that date [1]. Placed in service means ready and available to rent, even if no tenant has moved in yet [1]. It can apply to used property, not just new property [1]. That matters if you bought an existing house.
Bought before January 20, 2025? Those parts fall under older, lower bonus rates, not the 100% rule [1]. A study can still help, though. You can usually catch up on depreciation you missed by filing Form 3115. It tells the IRS you are fixing how you depreciated the property, so you can take the missed amount in one year [1]. People call this a look-back study.
5. Is cost segregation worth it after the fee and the sale?
Here is a rough way to add it up. Estimate the extra deduction you can really use in the next few years. Multiply it by your tax rate. Subtract the study fee. Then think about the tax you may owe when you sell.
If what is left is small, a study is probably not worth it for you. If it is large, it is worth a closer look with a tax professional.
When is cost segregation worth it, and when is it not?
| A study is more likely worth it when… | A study is less likely worth it when… |
|---|---|
| The building value (not the land) is large | Most of the price is land |
| You can use the loss now, through the $25,000 allowance or other passive income | Your income is above $150,000 and you have no passive income to offset |
| You plan to hold the property for many years | You plan to sell within a few years |
| You acquired it after January 19, 2025 | You bought it long ago and have made few upgrades |
| The property has many separate parts, like appliances, flooring, fencing and paving | It is a small house with few separate parts |
Limits and risks
Behind the question “is cost segregation worth it” sits a question about timing. Even a study that pays off does not lower your total depreciation. It moves deductions earlier, and the sale can take some of the benefit back. Passive loss rules can delay the benefit for years. The rules on income limits and on what counts as passive are detailed, and your situation may have exceptions this post does not cover.
The quality of the study matters too. A good report shows how it arrived at each split. Those numbers go on your tax return, so keep the full report with your property records.
How we can help
Our cost segregation study team offers a free initial consultation and a preliminary analysis before you decide. Bring your numbers and ask us plainly: is cost segregation worth it for this rental? If you are still deciding whether to buy more rentals, our real estate tax consulting looks at the bigger plan. You can book a consultation when you are ready.
Frequently asked questions
What is cost segregation in plain words?
It is a report that splits the cost of a building into parts with shorter tax lives, so you can deduct those parts faster. Our earlier guide, Understanding Cost Segregation, walks through the basic idea.
Is cost segregation worth it if my income is over $150,000?
It can be, but usually only if you can use the loss another way. That might be passive income from other rentals, or a sale that frees up stored losses [3]. Without one of those, the loss may sit unused for years.
Does cost segregation replace my other rental deductions?
No. A study only changes how the property is depreciated. Your other rental costs are handled as before, and our list of real estate tax deductions every investor should know covers the common ones.
Is cost segregation worth it if I plan to sell soon?
Usually less so. When you sell, the gain on parts you depreciated is generally taxed as ordinary income, up to the depreciation you took [1]. A quick sale gives you little time to use the money the study saved.
Can I do a study on a rental I bought years ago?
Often, yes. If you have filed two or more returns since, the catch-up is usually made by filing Form 3115 to change your accounting method, not by amending old returns [1]. Ask your tax preparer to check that your situation fits the IRS procedure.
This article is for informational and educational purposes only. It is not tax, legal or financial advice for your situation. Tax rules change, so talk with a qualified professional before you act.
Sources
- IRS Publication 946 (2025), How To Depreciate Property: 27.5-year recovery period, land not depreciable, 5-year and 15-year property, 100% special allowance after Jan. 19, 2025, used property, placed in service, recapture as ordinary income, Form 3115
- IRS news release IR-2026-06: guidance on the additional first year depreciation deduction: permanent 100% deduction for property acquired after Jan. 19, 2025
- IRS Publication 925 (2025), Passive Activity and At-Risk Rules: passive loss rule, $25,000 allowance, active participation, phaseout, losses allowed on disposition
- IRS Topic no. 409, Capital gains and losses: 25% maximum rate on unrecaptured section 1250 gain
