What it is, what it saves you, the rules, the catches, and what we need from you — written so nothing is hidden and nothing is a surprise later.
One-line version: A cost segregation study lets you take a large chunk of a building’s depreciation now instead of spread thinly over decades — putting cash back in your pocket sooner. It is a timing benefit, not free money, and it comes with rules and trade-offs you should understand before we begin.
Normally a building is written off (“depreciated”) very slowly — 27.5 years for residential rentals, 39 years for commercial. A cost segregation study uses an engineering analysis to break the building into smaller parts — flooring, appliances, cabinets, wiring, landscaping, parking, fixtures — that the IRS allows you to depreciate much faster, over 5, 7, or 15 years.
Faster write-off means bigger deductions in the early years, lower taxable income now, and more cash in hand today.
Bonus depreciation lets you deduct a percentage of the fast-life parts immediately in year one. The percentage is set by the year the property was first placed in service — not the year you do the study.
| Property placed in service | Bonus rate |
|---|---|
| Sept 28, 2017 – Dec 31, 2022 | 100% |
| 2023 | 80% |
| 2024 | 60% |
| Jan 1 – Jan 19, 2025 | 40% |
| After Jan 19, 2025 — new law, permanent | 100% |
The 2025 tax law (the “One Big Beautiful Bill”) restored permanent 100% bonus depreciation for property placed in service after January 19, 2025. Older buildings keep their own placed-in-service year’s rate — which, for anything placed in service in 2017–2022, is also 100%.
You do not have to do this in the year you buy. For a property you have owned for years, we do not amend old returns. Instead your CPA files Form 3115 (a change in accounting method) and takes a 481(a) catch-up adjustment — meaning all the accelerated depreciation you missed in prior years is deducted in one lump on the current year’s return.
Cost seg moves your deductions earlier; it does not erase tax. When you sell, the depreciation you took is “recaptured”:
• The fast 5/15-year parts (Section 1245) are recaptured at your ordinary income rate (up to 37%).
• The building itself (Section 1250) is “unrecaptured gain,” taxed at up to 25%.
The win is the time value of money — you hold the cash for years before paying it back. A 1031 exchange can defer recapture if you roll into another property.
Think about the tax you do not pay this year as money that would have gone to the government and you would never have seen again. Cost seg keeps it in your hands — and you put it to work controlling a large, appreciating asset. The benefit was never the deduction itself; it is the years of growth on money you would otherwise have handed over.
Leverage multiplies it. Borrow as much as you safely can: a modest down payment controls a much bigger building, you depreciate the whole purchase price — not just your cash — and you earn the appreciation on the entire asset, while the deferred tax quietly helps fund the position.§168(k)
Recapture is only owed when you sell. So the play is to not sell — trade up instead, hold for life, and let your heirs start clean:
1. Trade up with a 1031 exchange. When you are ready to move on, roll the proceeds into another like-kind property. A 1031 exchange defers both the capital gain and the building’s depreciation recapture — no tax due now. You can keep doing this into bigger and bigger buildings (“swap till you drop”).§1031
2. Hold it until you pass it on. When the property transfers to your heirs at death, their cost basis steps up to the building’s fair-market value on the date they receive it. Every dollar of deferred gain and recapture you carried — both the fast 1245 parts and the 1250 building — is permanently erased, never taxed.§1014
3. The clock resets to zero. Your heirs begin a brand-new depreciation schedule from that stepped-up value — they can run their own cost segregation study and start the entire play over, from the building’s value the day they inherit it.
The honest caveats: this only works if you hold until death — sell during life and the tax comes due. A 1031 has strict 45-day and 180-day deadlines and must run through a qualified intermediary; the fast 1245 portion needs careful structuring (recent IRS regulations treat most cost-seg components as real property, which helps); and §1031 and §1014 are current law that Congress can change. Your CPA and estate attorney build this — it is not a do-it-yourself move.
Rental losses are usually passive and can only offset passive income — not your W-2 or business income — unless you qualify as a Real Estate Professional and materially participate. If you do not qualify, the deduction is not lost; it carries forward until you have passive income or sell.
To qualify, one person must meet both tests in the same year:
• More than 750 hours in real estate trades/businesses (about 14.4 hours every week, all year), and
• More than half of all your working hours that year are in those real estate activities.
Hours that count: managing tenants, repairs/maintenance you do or directly supervise, showings, advertising, tenant screening, overseeing contractors, acquiring property. Hours that do not count: reviewing financials, market research, ROI spreadsheets, arranging financing, education and seminars. Employee hours do not count unless you own more than 5% of the employer. On a joint return, the two spouses’ hours cannot be combined to pass the tests. Keep a contemporaneous time log — the IRS audits this aggressively.
If you plan to sell soon, much of the accelerated deduction comes right back as recapture, so the net benefit is smaller. Cost seg works best when you will hold the property several years.
A study for a small multifamily typically runs about $3,000–$6,000; larger or commercial properties cost more. In most cases the first-year tax savings far exceed the study fee — but this is confirmed property-by-property, never assumed.
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This document is a plain-English education summary, not tax or legal advice. Tax law changes and every situation differs. Final numbers, eligibility, Form 3115 preparation, and how the deduction interacts with your overall return must be reviewed and signed off by your CPA or tax advisor. No specific dollar savings or audit outcome is guaranteed. © 2026 The Neuman Group.
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