Standard depreciation treats a building as one asset with one life. In reality a building is carpet, appliances, cabinetry, specialised electrical, landscaping and paving — components with much shorter useful lives. A cost segregation study performs that breakdown formally, and the effect is to pull deductions forward, sometimes dramatically. This is general information rather than tax advice; the outcome depends on your situation.
What the study does
An engineering-based analysis examines construction documents, invoices and the physical property, and allocates the purchase price across asset classes. Personal property such as appliances, carpet and certain fixtures moves to 5 or 7-year lives. Land improvements — paving, fencing, landscaping, site lighting — move to 15 years. The structural shell stays at 27.5 or 39. Typically 20–35% of a residential property’s basis reclassifies, though it varies widely by asset type.
What that is worth
On a $1,000,000 property with $800,000 allocated to the building, standard residential depreciation gives roughly $29,000 a year. If a study reclassifies $200,000 into shorter lives, a substantial portion of that becomes deductible far sooner — and where bonus depreciation applies to qualifying short-life property, a large share can be taken in the first year. The benefit is the time value of the deduction, not extra total deduction; you are accelerating, not creating.
When it pays for itself
Studies cost real money — typically several thousand dollars, scaling with property size and complexity. The rough test is whether the present value of accelerated deductions exceeds that cost, which generally needs a property basis in the high six figures or above, an intention to hold for several years, and enough taxable income for the deductions to be usable. Passive activity rules can strand deductions for investors without passive income to offset, which is the most common reason a study disappoints.
The recapture consequence
Accelerated deductions are recaptured at sale like any other depreciation, and personal property recaptured under Section 1245 can be taxed at ordinary rates rather than the 25% that applies to real property. Accelerating deductions into years when you are in a high bracket and recapturing them in a year when you are also in a high bracket can leave you worse off after fees. A 1031 exchange defers the recapture, which is part of why the two strategies pair.
How it interacts with your financing
It does not affect DSCR qualification at all — those loans underwrite rent against payment and never look at your return. It can affect conventional qualification, where income is calculated from tax returns and large paper losses cut both ways. It is also worth commissioning a study in the year you acquire or substantially improve a property rather than retroactively, though catch-up methods exist for properties already held.
Cost Segregation Study FAQ
Typically several thousand dollars, varying with property size, type and complexity. Get a free benefit estimate first — most providers will model the outcome before you commit.
Usually not. The reclassifiable basis is small relative to the study cost. It works best on larger multifamily and commercial assets.
Yes — catch-up methods allow previously unclaimed accelerated depreciation to be taken without amending prior returns. Your CPA handles the mechanics.
No. It accelerates the same total depreciation into earlier years. The benefit is the time value of money.
Accelerated depreciation is recaptured, and personal property components can face ordinary rates rather than the 25% applicable to real property. Model the exit before commissioning the study.
Not for DSCR loans, which never look at tax returns. On conventional loans, large depreciation losses affect calculated income in ways that can help or hurt.