Tax

Cost Segregation Explained: Accelerating Depreciation on Real Estate

What a cost segregation study actually does, which properties and owners benefit, how permanent 100% bonus depreciation supercharges the result, the passive-loss catch, and the recapture trade-off to model before you commission one.

By Aparna Devalla, CPA4 min · 5 slidesUpdated July 26, 2026

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What a Cost Seg Study Actually Does

By default, a building depreciates slowly — 27.5 years for residential rental, 39 years for commercial — as one undifferentiated asset.
A cost segregation study is an engineering-based analysis that breaks the building into components and reclassifies qualifying ones into 5-, 7-, and 15-year MACRS classes.
Typical reclassified items: carpet and specialty flooring, cabinetry, dedicated electrical and plumbing, decorative fixtures, and land improvements like parking lots, fencing, and landscaping.
A typical study moves 15% to 40% of the depreciable basis (building cost excluding land) into the shorter classes — the mix depends heavily on property type.
The result is the same total depreciation over the property's life, taken much earlier. The value is timing: deductions now are worth more than deductions in year 30.

The 100% Bonus Depreciation Interplay

Property in the 5-, 7-, and 15-year classes is bonus-eligible. Under OBBBA (July 2025), 100% bonus depreciation is permanent for property acquired and placed in service after January 19, 2025.
That combination is the engine: everything the study reclassifies into short-life classes can generally be deducted in full in year one, not spread over even the shortened lives.
Example shape: a $1M building (excluding land) with 25% reclassified produces roughly $250K of year-one depreciation instead of a straight-line trickle.
You can also study a property bought in a prior year: a look-back study with Form 3115 takes the entire missed depreciation as a one-time catch-up adjustment in the current year — no amended returns.
Because bonus is now permanent, there is no phase-down deadline pressure — the decision is about your tax picture, not a closing window.

Who Actually Benefits

Best property types: short-term rentals, restaurants, multifamily, retail, and medical or specialty-use buildings — all carry a high percentage of short-life components. Plain warehouses and simple offices reclassify less.
Price point: studies generally pencil from around $500K of building basis (excluding land) and up. Below that, the fee and complexity eat too much of the benefit — though streamlined studies exist for smaller residential properties.
Best timing: a recent purchase, new construction, or a major renovation. The earlier in the hold, the more years the accelerated deductions have to work.
You need income for the losses to offset — this year or in the reasonably near future. A large paper loss with nothing to absorb it just sits suspended.
Planning to sell within a few years? The benefit shrinks and the recapture cost looms — cost seg rewards holders, not flippers.

The Passive-Loss Catch

Rental losses are passive by default. A big cost-seg loss can generally only offset other passive income — not W-2 wages or business income — unless an exception applies.
Exception one: real estate professional status (REPS) — more than half your working time and at least 750 hours in real property trades, plus material participation in the rental. Then rental losses go non-passive.
Exception two: the short-term rental route — average guest stay of 7 days or less plus material participation takes the activity out of the rental-passive regime entirely.
No exception? The losses are not wasted — they suspend and carry forward, offsetting future passive income and releasing in full when you sell the property.
This interplay is where cost seg marketing oversells. The study creates the deduction; your participation profile determines when you can actually use it.

Recapture, Cost vs. Benefit, and Next Steps

The trade-off at sale: gain attributable to the short-life property you rapidly depreciated is recaptured at ordinary income rates, not capital-gain rates.
Cost seg is therefore a deferral-plus-arbitrage play: you take deductions early (time value) and against ordinary rates, and repay some of it later — the longer the hold, the better the math.
A 1031 exchange at sale can carry the deferred picture forward; a step-up at death can end it entirely. Exit planning belongs in the decision.
Weigh the study fee against the net-present-value of the acceleration, not the headline year-one deduction — a good provider will model this before you engage.
Run your property through our cost segregation calculator for a first-pass estimate, then have a CPA model the passive-loss and recapture picture. Rubric Financial coordinates studies and the surrounding tax planning for real estate clients.

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Educational content — not tax, legal, or accounting advice. Confirm with a CPA before acting.

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Frequently asked questions

Is a cost segregation study worth it for my property?

As a rule of thumb, studies pencil from roughly $500K of building basis (excluding land) and up, with the strongest results on short-term rentals, restaurants, multifamily, retail, and specialty-use buildings. Weigh the study fee against the net-present-value of accelerating the deductions — not the headline year-one number — and confirm you have income, passive or otherwise, for the losses to offset.

Can I do a cost seg study on a property I bought years ago?

Yes. A look-back study paired with Form 3115 (an automatic accounting-method change) lets you take all the depreciation you missed as a one-time catch-up adjustment on your current-year return — no amended returns required. This is often the highest-impact version of cost seg, because several years of missed acceleration land in a single year.

Does 100% bonus depreciation still apply?

Yes — and it is permanent. Under the OBBBA legislation enacted in July 2025, 100% bonus depreciation applies to qualifying property acquired and placed in service after January 19, 2025, with no phase-down schedule. The 5-, 7-, and 15-year classes a cost seg study creates are bonus-eligible, which is what lets the reclassified amounts be deducted in full in year one.

Will cost seg losses offset my W-2 income?

Usually not directly. Rental losses are passive by default, so they offset passive income only — unless you qualify for real estate professional status (more than half your working time and 750-plus hours in real property trades, with material participation) or the short-term rental exception (average stay of 7 days or less plus material participation). Otherwise the losses suspend and carry forward, releasing when you sell.

What happens to all that depreciation when I sell?

Gain attributable to the short-life property you rapidly depreciated is recaptured at ordinary income rates rather than capital-gain rates. That makes cost seg a timing-and-rate play that rewards longer holds. A 1031 exchange can defer the reckoning, and a basis step-up at death can eliminate it — which is why exit plans belong in the cost seg decision from the start.

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Cost Segregation Explained: Accelerating Depreciation on Real Estate

What a Cost Seg Study Actually Does

The 100% Bonus Depreciation Interplay

Who Actually Benefits

The Passive-Loss Catch

Recapture, Cost vs. Benefit, and Next Steps

Frequently asked questions

Is a cost segregation study worth it for my property?

Can I do a cost seg study on a property I bought years ago?

Does 100% bonus depreciation still apply?

Will cost seg losses offset my W-2 income?

What happens to all that depreciation when I sell?

When (and How) to Switch From Cash to Accrual Accounting

Month-End Close Checklist for Small Businesses

Multi-State Payroll Setup for Small Businesses

Need help applying this to your business?

Cost Segregation Explained: Accelerating Depreciation on Real Estate

What a Cost Seg Study Actually Does

Frequently asked questions

Is a cost segregation study worth it for my property?

Can I do a cost seg study on a property I bought years ago?

Does 100% bonus depreciation still apply?

Will cost seg losses offset my W-2 income?

What happens to all that depreciation when I sell?

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When (and How) to Switch From Cash to Accrual Accounting

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Need help applying this to your business?