When cost segregation is not worth it

Written by Landon RoseLast updated 2026-10-07Pending review by a Certified Cost Segregation Professional

A cost segregation study usually isn't worth it when you can't use the extra loss this year (it's passive and you have no passive income), the building basis is small (roughly under $200,000), or you plan to sell within a year or two. In those cases the fee can exceed the real benefit. If none of those apply, a study often pays for itself many times over.

1. The loss would just sit there (passive activity rules)

Depreciation creates a loss on paper. If your rental is a passive activity and you have no other passive income, that loss is usually suspended and carried forward. It isn't lost, but it doesn't cut this year's tax. Short-term rentals with an average guest stay of 7 days or less, where you materially participate, are generally not treated as passive under the regulations. That's why cost seg is popular with Airbnb owners. If you don't meet those tests, talk to your tax professional before paying for a study.

2. The building is inexpensive

On a property with $150,000 of building basis, a typical 15–35% reclassification is $22,500–$52,500. At a 24% bracket that's about $5,400–$12,600 of tax deferred, before the fee. It can still work, but the margin is thin. Try your numbers in the calculator.

3. You're selling soon

When you sell, depreciation on 5- and 15-year property is generally recaptured as ordinary income. You still get the time value of the deduction, but a quick sale shrinks it. Planning a 1031 exchange changes the math, so ask your CPA.

4. Your income is already low this year

A deduction is worth your marginal rate. If you're in a 10–12% bracket this year, or already have large losses, the benefit may be better saved for a higher-income year. A catch-up study done later (via Form 3115) can still claim it.

5. It's your personal residence

Depreciation only applies to property used in a business or held for producing income. A primary home with an occasional rental generally doesn't qualify for a full study.

6. You bought in a phase-down year and can't use the loss

Property acquired in 2023 or 2024 gets 80% or 60% bonus depreciation, not 100%. The study still accelerates deductions, just less of them up front.

7. You only need a rough number

If you just want to see whether it's worth exploring, a free estimate is enough to start. Pay for a full study only when you're ready to file with it.

A five-minute check

Three yeses usually means a study is worth a closer look.

Sources

This article is general information, not tax advice. Confirm how it applies to you with your tax professional.

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