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Cost segregation

A study that reclassifies parts of a building from 39-year or 27.5-year property into shorter-lived categories, accelerating depreciation.

What is Cost segregation?

A study that reclassifies parts of a building from 39-year or 27.5-year property into shorter-lived categories, accelerating depreciation.

Why it matters on your return

For real estate investors with new or recently purchased property, front-loaded depreciation can create large paper losses in the first years, though passive activity rules limit who can use them against other income.

Example

A $1,000,000 rental building would ordinarily depreciate about $36,000 a year. A study identifies $250,000 of 5- and 15-year property, producing a first-year deduction several times larger with bonus depreciation.

Is a cost segregation study worth it on a small property?

Usually not below a few hundred thousand dollars of building value; the study cost outweighs the benefit. It depends on your marginal rate and whether you can use the losses.

Last reviewed September 15, 2026. Tax rules change; confirm current law before acting.

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