Cost Segregation: Accelerating Depreciation

Depreciation is one of real estate's quiet superpowers, but the standard schedule is slow — 27.5 years for a residential rental, 39 for commercial. Cost segregation speeds it up. By identifying the components of a building that can be depreciated over much shorter lives, a cost-segregation study front-loads your deductions into the early years of ownership, when the time value of the tax savings is greatest. For the right investor and property, it can free up substantial cash. But it isn't free of trade-offs, particularly at sale. This memo explains how it works and when it makes sense. It's general information, not tax advice.

What cost segregation is

Normally, you depreciate an entire building over a single long schedule — 27.5 years for residential rental property, 39 for commercial. But a building isn't one uniform asset; it's made of components with very different useful lives. Cost segregation is the practice of identifying those components — things like carpeting and fixtures, specialized electrical and plumbing, cabinetry, and land improvements such as landscaping and parking — and reclassifying them into the shorter depreciation lives the tax code allows, typically 5, 7, or 15 years instead of 27.5 or 39. The structural building itself stays on the long schedule, but breaking out the faster-depreciating pieces accelerates a meaningful share of your deductions.

How a cost-segregation study works

The reclassification isn't a guess; it's documented by a cost-segregation study, usually performed by specialists who combine engineering and tax expertise. They analyze the property — construction documents, costs, and often a site inspection — to allocate its cost among the various asset classes and their proper depreciation lives, producing a report that supports the accelerated deductions if the IRS ever asks. A study costs money and makes sense above a certain property value, but for larger or recently acquired/constructed properties the tax savings typically dwarf the study's cost. It can also be applied to properties bought in prior years via a "catch-up" adjustment, without amending old returns.

The bonus-depreciation interaction

Cost segregation becomes especially powerful when paired with bonus depreciation, which allows an even larger immediate write-off of qualifying shorter-life property in the year it's placed in service. The two work together: cost segregation identifies the assets eligible for the faster treatment, and bonus depreciation lets you deduct a large portion of them up front. Bonus-depreciation rules have changed repeatedly in recent years and were addressed again by the 2025 tax law, which expanded the immediate write-off — so the exact percentage available depends on current rules and when the property was placed in service. This is a moving target worth confirming with your CPA before relying on a specific figure.

Who benefits most

Cost segregation isn't for everyone. It delivers the most value to investors who can actually use large near-term deductions — typically those with significant taxable income to offset — and who own properties big enough that the accelerated deductions exceed the cost of a study. It's especially attractive in the year a property is acquired, built, or substantially renovated. It matters less for an investor with little income to shelter, a very small property, or a near-term plan to sell (since accelerating deductions you'll soon have to recapture offers less benefit). As with any tax strategy, the value depends on your specific situation — the reason to model it before commissioning a study.

The recapture trade-off

Acceleration has a cost at the back end. Because cost segregation front-loads depreciation, it increases the depreciation you'll have to recapture when you sell — and recapture is taxed at up to 25%, higher than the long-term capital gains rate. In effect, you've pulled deductions forward at your ordinary rate and may pay them back at the recapture rate later, so the benefit is partly a timing and rate-arbitrage play, valuable mainly because of the time value of money. The good news: a 1031 exchange defers that recapture along with the capital gain, and holding until death can eliminate it via a stepped-up basis. So cost segregation pairs naturally with a long-term hold-and-exchange strategy, where the accelerated deductions are enjoyed now and the recapture is deferred indefinitely.

Cost segregation and DSTs

Because a Delaware Statutory Trust is a grantor trust, each investor is treated as owning a direct, undivided interest in the underlying real estate — not a share in a partnership. That structure is what lets a DST interest qualify for a 1031 exchange, and it has a useful side effect: depreciation, including the accelerated kind, flows straight through to you on your grantor letter, just as if you owned the building directly. So cost segregation is available on DST property too — the real question is simply who orders the study.

Some DSTs come with a study already done

Many sponsors commission a cost-segregation study at the trust level before the offering closes and pass the benefit through to every investor — these are sometimes marketed as "bonus-depreciation DSTs." When a DST includes a study, you don't have to lift a finger: your pro-rata share of the accelerated depreciation simply appears on the annual grantor letter and flows onto your Schedule E. If front-loaded deductions matter to you, ask the sponsor up front whether a study has been done and request the depreciation schedule — it can materially change your year-one tax picture, so it's worth confirming before you invest.

If a DST doesn't include one, you can order your own

Not every DST comes with a study. When it doesn't, you can commission your own cost-segregation study on your fractional interest — precisely because you're treated as a direct owner of the real estate. In practice, you (or your CPA) engage a cost-segregation firm and obtain the data the study needs — the purchase price, the cost allocation, and construction details — which generally means coordinating with the sponsor or trustee for the property records. The firm then allocates your share of the basis among the shorter-life asset classes, and you claim the accelerated depreciation on your personal return. Sponsors increasingly expect these requests and many will provide the underlying data, but the study, its cost, and the filing are yours to manage.

One nuance matters more here than almost anywhere else: getting the basis right. If you entered the DST through a 1031 exchange, your basis splits in two. The carryover basis from your old property keeps depreciating on its existing schedule and generally can't be re-accelerated or bonused. But any excess basis — the additional cash you put in beyond your deferred gain — is treated as newly placed-in-service property, and it is eligible for cost segregation and for 100% bonus depreciation (made permanent for property placed in service after January 19, 2025). A direct cash investor who didn't use a 1031 has a fresh, full basis, so the entire interest is fair game. Misallocating carryover versus excess basis is the most common way these studies go wrong — firmly CPA territory.

Two final cautions. Most DST investors are passive, so the accelerated depreciation produces passive losses that offset passive income — including the DST's own distributions and your other passive income — with any excess suspended until you dispose of the interest. And, as with any cost segregation, the deductions you pull forward become recapture later — though a DST that ultimately rolls into another 1031 or a 721 exchange defers that too. You can estimate the potential first-year benefit on your share with our cost segregation calculator.

Putting it together

Cost segregation is most compelling for an investor with meaningful income to shelter, a sizable property recently acquired or built, and a plan to hold (ideally pairing it with 1031 exchanges to defer the eventual recapture). It's less compelling for small properties, investors with little income to offset, or those about to sell without an exchange. The decision turns on running the numbers: the present value of the accelerated deductions against the study's cost and the future recapture. A qualified CPA and a reputable cost-segregation firm can model that for your property — the right way to decide whether the acceleration is worth it. As always, this is general information, not tax advice.

Frequently Asked Questions

Glossary

Cost Segregation

Reclassifying building components into shorter depreciation lives to accelerate deductions.

Cost-Segregation Study

An engineering-and-tax analysis allocating a property's cost among asset classes and lives.

Bonus Depreciation

An additional first-year deduction for qualifying shorter-life property; rules changed under the 2025 tax law.

Depreciation Recapture

Tax due at sale on depreciation claimed, taxed at up to 25%; increased by cost segregation.

Excess Basis

In a 1031 exchange, the basis above the carryover amount (typically extra cash invested); treated as newly placed-in-service property eligible for cost segregation and bonus depreciation.

Grantor Letter

The substitute-1099 statement a DST issues each investor, reporting their share of income, expenses, and depreciation.

Disclosures