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When you buy or build an income property, the tax code does not treat everything you paid for as "the building." The parking lot, the sidewalks, the fencing, the landscaping, the site lighting and the storm drainage are generally land improvements, depreciated over 15 years under asset class 00.3 of Rev. Proc. 87-56, rather than the 27.5 years used for residential rental buildings or the 39 years used for commercial buildings. Because 15 years is under the 20-year ceiling in Section 168(k), land improvements qualify for bonus depreciation, and for property acquired and placed in service after January 19, 2025 that bonus is 100 percent.
The catch is that nobody gets this automatically. Your closing statement does not break out the parking lot, and your CPA's default schedule puts everything except land into one long bucket. A fully engineered and accounted cost segregation study finds those assets, measures them and moves them into the correct recovery period. Whether you can use the deduction this year is a separate question, answered by the passive loss rules below.
Land is the dirt itself. It has no determinable useful life, so it never produces a depreciation deduction, which is why the split between land and everything else deserves review. Our guide to land value allocation covers how that split is made.
Land improvements are man-made additions to the land, separate from the building, that wear out over time. These are the 15-year assets.
The building is the structure and its structural components: foundation, framing, exterior walls, roof and the permanent systems that make it function. Residential rental property runs 27.5 years, nonresidential 39.
A fourth category, personal property such as removable carpet, specialty lighting, appliances and equipment, generally runs 5 or 7 years and is usually where a study finds the largest deductions. The 15-year slice is the most overlooked part of many studies and the easiest to explain to a skeptical CPA.
Asset class 00.3 describes land improvements as items such as sidewalks, roads, canals, drainage facilities, non-municipal sewers, wharves and docks, bridges, fences, landscaping and shrubbery. On a typical income property the engineer looks for the following, where the engineering supports it.
A small multifamily building on a tight city lot may have only a short walkway and a little landscaping. A suburban apartment community, a self-storage facility, a retail center or a lakefront vacation rental can have a surprising amount of site work.
The six factors from Whiteco Industries v. Commissioner, 65 T.C. 664 (1975), decide the close calls: how the item is attached, whether it was designed to be moved and what removing it would do to the building.
Moving an asset from 39 years to 15 helps. The real change comes from bonus depreciation. Without bonus, 15-year property depreciates under the 150 percent declining balance method with the half-year convention, so a $100,000 land improvement placed in service during the year produces a $5,000 first-year deduction under the standard table. With 100 percent bonus, the same $100,000 is deducted in year one. Bonus is automatic; your CPA can elect out by asset class for a given year if your income is too low to use a large deduction.
The acquisition date controls which bonus percentage applies. Our guide to 100 percent bonus depreciation under the One Big Beautiful Bill Act explains the current law, and the date you acquired the property, rather than the date you placed it in service, decides the rate. Property acquired before January 20, 2025, or under a binding contract signed before that date, stays at the prior rate even if it was placed in service later.
One note on terminology. Land improvements are sometimes confused with qualified improvement property, or QIP, which covers certain interior improvements made by the taxpayer to an existing nonresidential building and also runs 15 years, straight-line. They share a recovery period and bonus eligibility and nothing else. A parking lot is a land improvement. A new interior tenant buildout is QIP.
The following is illustrative, and every property is different.
Kwame and Abena Mensah of Greenville, South Carolina, bought a 36-unit apartment community in January 2026 for $4,000,000. Their closing documents and county assessment supported allocating 20 percent of the price to land, or $800,000. That left a depreciable basis of $3,200,000.
Their CPA initially put the entire $3,200,000 on a 27.5-year straight-line schedule. Placed in service in January, the IRS mid-month table gives a first-year rate of 3.485 percent, or $111,520.
Then they commissioned a cost segregation study. An in-house analyst did a proper inspection, reviewed site plans and the closing statement, and measured the paving, walkways, fencing, lighting, landscaping, pool and courtyard. The study reclassified the $3,200,000 as follows:
With 100 percent bonus depreciation on the personal property and land improvements, the first-year picture changes. The $448,000 and the $384,000 can each be deducted in full, for a combined $832,000. The remaining building basis of $2,368,000 still depreciates at the 27.5-year rate, producing about $82,525 in the first year. Total first-year depreciation comes to roughly $914,525, compared with $111,520 on the original schedule.
The incremental first-year deduction is about $803,000. At a 37 percent marginal federal rate, that is roughly $297,100 of federal tax value, and the 15-year land improvement slice alone represents about $142,100 of that figure. Two limits sit on top of the arithmetic. Kwame and Abena file jointly, and the loss is passive unless one of them qualifies as a real estate professional and materially participates in the rental, or the losses have passive income to absorb. Even as a nonpassive loss, Section 461(l) caps the business loss a household can deduct against other income. For tax years beginning in 2026 the cap is $512,000 for joint filers and $256,000 for single filers, adjusted annually, so if the whole $803,000 landed as a net business loss on their 2026 return, $512,000 would be used that year and about $291,000 would carry forward as a net operating loss. The passive rules are discussed below.
Notice what is doing the work. Had the study ignored the site, the Mensah family would have left $384,000 of 15-year property sitting inside a 27.5-year schedule. It comes down to measuring what is on the ground.
Without bonus, the 15-year slice alone would have produced a first-year deduction of about $19,200 (5 percent of $384,000). Bonus turns that trickle into a single large deduction, and the election-out gives their CPA the choice.
Small properties have land improvements too. Deepa Natarajan bought a lakefront vacation home on Lake Wawasee, Indiana, in March 2026 for $1,100,000. After allocating $275,000 to the land, the depreciable basis was $825,000. The property has a long gravel and paved driveway, a freestanding stone patio, a fire pit area, perimeter fencing, mature landscaping with irrigation, outdoor lighting, and a private dock.
A cost segregation study identified roughly $96,000 of those assets as 15-year land improvements, in addition to personal property inside the home such as furniture and appliances. At a 37 percent marginal rate, the $96,000 of land improvements alone would represent about $35,520 of potential federal tax value if fully deducted in year one, compared with about $4,800 of deduction in year one if they had stayed on a standard 15-year schedule without bonus.
Whether Deepa can use that deduction depends on how the property is classified. When the average stay is seven days or less, the activity falls outside the passive "rental activity" definition, and the question becomes whether she materially participates. Longer average stays change the thresholds, and personal use of the home can reduce the deduction. Our guide to furniture, hot tubs and outdoor spaces at a short-term rental covers the rest of Deepa's property.
The closing statement does not itemize them. When you buy an existing property, the purchase price is a single number; the seller built the parking lot twenty years ago, and nobody wrote an invoice for it at closing. A preparer sets the land aside and depreciates the rest as one asset, which is a reasonable default without engineering data and leaves every 15-year asset on the long schedule. On new construction the detail hides inside the contractor's schedule of values, organized by trade rather than tax class.
The IRS has published its own view of what makes a study reliable in its Audit Techniques Guide. A fully engineered and accounted study works under the first two of the six approaches the guide describes, Approach 1 from actual cost records and Approach 2 from documented estimates reconciled to the purchase price, and it delivers a component schedule your CPA can import and the engineering support behind it, signed by credentialed professionals, which an examiner can trace line by line. The estimated study hands you a percentage with no schedule under it. Cost Seg America defends every study for as long as you own the building, no time limit, no hour cap, no additional fee, with written responses and participation in examiner calls alongside your CPA.
Often yes. If you bought or built the property in a prior year and never did a study, you can catch up on missed depreciation without amending past returns, through an automatic accounting method change on Form 3115 with a Section 481(a) adjustment in the year of change. Our guide to how a look-back study recovers missed depreciation explains the mechanics. Land improvements are often a meaningful part of a lookback because they are the oldest, most overlooked assets on the schedule, and the catch-up lands at the bonus rate of the year the property was placed in service.
The same logic applies when you replace a land improvement. Tear out and replace a parking lot, and the old pavement may still be sitting on your schedule; a documented partial asset disposition writes off its remaining basis, elected on a timely filed return for the year of the replacement. Whether the work is a deductible repair or a capital improvement follows the tangible property regulations: patching and sealcoating lean toward repair, a full replacement toward capitalization, and the facts control.
Rental real estate is generally a passive activity. Passive losses offset only passive income, and the excess is suspended and carried forward. That is the most common reason a large cost segregation deduction does not lower this year's tax bill. Four situations change the answer.
Owners who fit none of these categories still have the deduction waiting. Suspended passive losses carry forward and are released when substantially all of the activity is sold in a fully taxable transaction. One more limit: Section 461(l) caps how much net business loss a noncorporate taxpayer can deduct against nonbusiness income in a year, as the Mensah example showed. Our post on the 2026 excess business loss limit explains the cap.
Accelerated depreciation is a timing benefit, and some of it comes back at sale. Land improvements are Section 1250 property, the same broad category as the building: depreciation taken in excess of straight-line, which includes bonus, is recaptured as ordinary income, and the straight-line portion is taxed as unrecaptured Section 1250 gain at a maximum 25 percent. Five- and seven-year personal property is Section 1245 property, where gain up to the depreciation taken is ordinary income.
Several things soften the picture. A sale is an event you control. A Section 1031 exchange can defer the gain, subject to the replacement property's own mix of components, property held until death receives a step-up in basis, and a dollar of tax saved today is worth more than a dollar paid years from now. Our article on what happens to recapture when you sell walks the numbers. All of it argues for doing the math before you commit, with your CPA at the table.
Skip the study when the depreciable basis after land is under $180,000, when you plan to sell within a couple of years so that recapture arrives before the time value has done much, or when the loss would be passive with nothing to absorb it and no sale in sight. A dense urban building with no site work may also show too little in the 15-year bucket to matter on its own, though the interior personal property usually still carries the study. Properties with large sites relative to their footprint have the most: garden-style apartments with surface parking, strip centers, self-storage, motels and lakefront rentals. The free proposal is the quickest way to find out whether your numbers justify a study.
A land improvement is a man-made addition to land, separate from the building, with a determinable useful life that wears out over time. Examples include parking lots, sidewalks, fences, landscaping, site lighting, and drainage. Under Rev. Proc. 87-56, asset class 00.3, land improvements are generally depreciated over 15 years.
Generally yes. Bonus depreciation under Section 168(k) applies to property with a recovery period of 20 years or less, and land improvements run 15. For qualifying property acquired and placed in service after January 19, 2025, the bonus percentage is 100 percent. Your CPA can elect out by asset class for a tax year.
A paved parking lot is a standard example of a land improvement and is generally examined as 15-year property. The associated striping, curbs, and drainage are also commonly included. A study separates these items from any structured parking, which is generally part of the building.
Often yes. A lookback study claims the depreciation you missed through an automatic accounting method change on Form 3115, with a catch-up adjustment in the year of change and no amended returns. The bonus rate of your acquisition year applies.
Some of it. Because land improvements are Section 1250 property, depreciation taken beyond straight-line is recaptured as ordinary income, and the straight-line portion is taxed at a maximum 25 percent for non-corporate taxpayers. A 1031 exchange may defer it.
No one can promise that an audit will not happen. What a study controls is what happens if one does. Cost Seg America has stood behind its work in 125+ IRS examinations with zero losses and $0 returned.
If you own an income property, or you are about to buy one, send Jim Dougherty and his team the address, the purchase price and a site plan or a few photos of the lot. You will have a free proposal in 24 hours showing what portion of your property may belong in the 15-year bucket and what the first-year deduction looks like. Call 1-888-365-5023 or email info@costsegamerica.com, and bring your CPA into the conversation.
This article is educational and general in nature and does not constitute tax, legal, or accounting advice. The examples are illustrative and the figures guarantee nothing. Confirm your specific situation with your CPA before making any decision.
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