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A car wash, a gas station or a convenience store is mostly equipment and pavement wrapped around a small building, and a fully engineered and accounted cost segregation study will usually move 25 percent to 35 percent of the depreciable basis, the high end of the range, into 5-, 7- and 15-year classes that take 100 percent bonus depreciation when the property was acquired and placed in service after January 19, 2025. The catch comes first: the loss only helps if it can reach your return. If you lease the site to an operator, the loss is passive. If you run the wash yourself, you have to materially participate. If you rent it to your own operating company, the self-rental rule traps the loss until you group the two activities. Settle that with your CPA, then order the study.
Curtis is a dentist in Fargo, North Dakota. In March 2025 he closed on an express tunnel car wash on 13th Avenue South for $3,000,000, with the county assessment putting 20 percent of the value in land. His depreciable basis was $2,400,000. The settlement statement did not break the price into parts, and his CPA did what most preparers do with a commercial building: all $2,400,000 onto a 39-year schedule, $48,792 of depreciation in the first year, about $61,500 a year after that.
In October he asked the question that changed the picture. He had bought a 120-foot conveyor, a tunnel of brushes, mitters and blowers, a chemical dosing system, a water reclaim plant, sixteen vacuum stalls under a canopy, two pay stations and a lot designed to stack forty cars. Why was he depreciating all of it like a brick wall? He was right to ask. A conveyor is not a roof. The code draws that line, and a study is the engineering work that draws it on paper.
Under MACRS, nonresidential real property is depreciated over 39 years and land is never depreciated. Tangible personal property, which is the equipment and the electrical and plumbing that exist to serve it, is recovered over 5 or 7 years. Land improvements such as paving, curbing, site lighting, fencing and drainage are recovered over 15 years. Those classes come from the code, the regulations, Revenue Procedure 87-56 and forty years of court decisions. The courts separate Section 1245 property from Section 1250 property with the six factors from Whiteco Industries, and the IRS describes what a supportable study looks like in its Audit Techniques Guide, Publication 5653.
Bonus depreciation is what makes the sorting worth real money now. The One Big Beautiful Bill Act, signed July 4, 2025, restored 100 percent bonus for qualifying property acquired and placed in service after January 19, 2025 and made it permanent. Qualifying property is property with a recovery period of 20 years or less, which is every class a study creates except the building. Used property qualifies if you had not used it before and bought from an unrelated party. The acquisition date can turn on the date of a binding contract rather than the closing, under Notice 2026-11. Placed in service is the day the property is ready for its intended use, which may come after the closing.
The business is the equipment. Here is how a tunnel site breaks down, with each item decided on the facts.
Wash equipment and tunnel systems. The conveyor, brush and mitter curtains, high-pressure arches, blowers, chemical dosing and the controls that run them are machinery used to wash cars, examined as 5-year property under asset class 57.0 where the engineering supports it. In-bay automatics and self-serve bays have their own versions.
Water reclaim and treatment. Reclaim tanks, filtration, pumps and the specialized piping that connects them to the wash equipment exist to serve the equipment rather than the building. The restroom plumbing and the domestic water service stay with the building.
Vacuum islands and customer equipment. Central vacuum turbines and the arches and hoses they feed, pay stations, point-of-sale, mat cleaners and vending. The vacuum canopy and the electrical to it get their own analysis; the canopy is often a land improvement and the dedicated circuits are often personal property.
Dedicated electrical, trenches and pads. Power distribution, motor control centers and circuits that exist only to run the wash equipment, and the equipment pads, trenches and pits that function as part of the machinery, are examined as personal property. The main service and the general lighting stay with the building.
Site work. Paving, curbing, striping, the stacking lanes, site lighting, fencing, the pylon sign structure, storm drainage and landscaping are examined as 15-year land improvements. A wash sits on a lot built for vehicle flow, and the site work is often a quarter of the price.
The building. The tunnel structure, roof, exterior walls, foundation, general HVAC and restrooms stay at 39 years. A study still carves out removable finishes and specialty lighting inside it.
A fueling site has a different mix and the same logic.
Dispensers, point-of-sale and payment systems are equipment, examined as 5- or 7-year property.
Refrigeration and food service. Walk-in coolers, reach-in cases, fountain and coffee equipment and the kitchen in a site with a quick-service counter. A store with a restaurant inside carries a lot of this.
Underground tanks, piping and the fuel canopy. The hardest calls on the site. Tanks and product piping that exist to store and move fuel are examined as equipment where the facts support it; the canopy is often a land improvement or structure depending on how it is built and what it is attached to. This is where the study earns its fee, with the Whiteco factors applied item by item instead of a blanket assumption.
Site work. Fueling sites have the highest ratio of pavement to building of any retail property, and all of it is examined as 15-year.
Store interior. Gondola shelving, removable finishes and non-structural partitions are personal property or short-life interior components depending on the design.
Environmental remediation at a fuel site has its own deduction and capitalization rules outside cost segregation. Have your CPA handle it separately and make sure the same dollars are not counted twice.
This example is illustrative. The percentages are hypothetical, the federal marginal rate is 37 percent, and the property was placed in service in March, where the mid-month convention gives a first-year 39-year rate of 2.033 percent.
| Class | Share of basis | Amount | First-year depreciation |
|---|---|---|---|
| 5-year equipment and dedicated systems | 25 percent | $600,000 | $600,000 (100 percent bonus) |
| 15-year land improvements | 10 percent | $240,000 | $240,000 (100 percent bonus) |
| 39-year building | 65 percent | $1,560,000 | $31,715 (2.033 percent) |
| Total | 100 percent | $2,400,000 | $871,715 |
First-year depreciation with the study is $871,715. Without it, $48,792. The additional deduction is $822,923, and at 37 percent that is $304,482 of federal tax, if the loss can reach his return. The 35 percent reclassified is the top of the 20 to 35 percent range, which is where equipment-heavy washes tend to land; some come in lower. One more number matters even in the best case. Curtis and his wife file jointly, so if the loss were nonpassive, Section 461(l) would let $626,000 of it offset their wages and practice income in 2025 ($313,000 single, adjusted annually), with the remaining $196,923 carried forward as a net operating loss.
Arturo's LLC bought a fueling and convenience site in Dunn, North Carolina for $2,000,000 in March 2025, with $500,000 allocated to land and $1,500,000 of depreciable basis: eight dispensers, a canopy, tanks and piping, a 3,200 square foot store with a walk-in cooler and display cases, and a large lit lot. Without a study, first-year depreciation is $30,495. With one, assume 20 percent to 5- and 7-year property ($300,000), 15 percent to land improvements ($225,000) and 65 percent to the building ($975,000, which produces $19,822). First-year depreciation is $544,822, an additional $514,327 over the default schedule. Arturo runs the store himself and materially participates, he and his wife file jointly, and after the store's own profit the net business loss sits under the $626,000 joint cap under Section 461(l) for 2025. Fuel sites land in the middle of the range because the building and the canopy carry more of the price.
A large deduction turns into cash only when the loss can reach your return. That depends on how you hold the site and what you do there, and these properties hit the rules in distinctive ways.
You operate the wash. An owner-operated car wash is a trade or business rather than a rental. The passive test is material participation, usually more than 500 hours in the year, and the real estate professional rules do not come into it. Curtis, with a dental practice, cannot get to 500 hours; his loss is passive unless he can meet one of the other tests in the material participation rules.
You lease the site to an operator. Now it is a rental, and the loss is passive unless you are a real estate professional with more than 750 hours and more than half your working time in real property trades, and you materially participate in the rental. Spouses cannot combine hours.
You rent it to your own operating company. The self-rental rule treats net rental income as non-passive but leaves a net rental loss passive, so the study's loss cannot touch the operating profit unless you make a grouping election treating the two as one activity. The self-rental rule in Reg. 1.469-2(f)(6) leaves the loss passive unless the business and the building are in the same activity, which the grouping election under Reg. 1.469-4(d)(1)(ii) allows when each owner holds the same proportionate interest in both. Settle it before you sign the lease.
The excess business loss limit. Even a nonpassive loss can offset wages and investment income only up to the Section 461(l) cap, $313,000 single and $626,000 joint for 2025, adjusted annually; the rest becomes a net operating loss carryforward. For tax years beginning in 2026 the cap is $256,000 single and $512,000 joint.
Basis and at-risk. You deduct losses only up to your basis and your at-risk amount. Borrowed money counts when the financing is recourse, as a guaranteed bank loan is, or qualified nonrecourse financing secured by the real estate.
Unused losses wait. A suspended passive loss carries forward and is released in full when you sell to an unrelated party in a taxable sale.
The IRS Audit Techniques Guide describes six approaches to cost segregation and prescribes none. Our team works only under the first two, Approaches 1 and 2: detailed engineering from actual cost records where they exist, and engineering with documented estimates reconciled to the purchase price where they do not. Under those approaches the engineer takes Curtis's tunnel apart on paper. The conveyor is costed from the manufacturer's quote or the reconciled estimate, the reclaim plant from its pump schedule, the vacuum turbines by count and horsepower, the stacking lanes in square yards of concrete. Each item is assigned a class with a written reason and listed on a component schedule the CPA imports into the fixed asset system and an examiner can trace line by line back to the $2,400,000. The report is signed by credentialed professionals, engineered in the United States, and defended for as long as you own the property, with no time limit, hour cap or added fee: written responses and participation in examiner calls alongside your CPA. A software estimate gives you a percentage and nothing to hand the examiner, and the hard calls on a fuel site, the tanks, the piping, the canopy, are exactly the calls a percentage cannot make.
Depreciation on the 5- and 7-year property is recaptured under Section 1245 as ordinary income up to the amount claimed; on the 15-year land improvements, the bonus taken in excess of straight-line is ordinary income under Section 1250 and the rest is unrecaptured Section 1250 gain at a maximum 25 percent. Depreciation on the building is unrecaptured Section 1250 gain, taxed at a maximum of 25 percent. On an equipment-heavy site most of the deduction is 1245, so a sale in year two gives most of the $822,923 back as ordinary income with only the time value in between. Hold eight years, reinvest the $304,482, or exchange out and the study wins; a 1031 exchange can defer the Section 1245 recapture, subject to the replacement property carrying enough Section 1245 property to absorb it. The recapture math is worked through in its own post. When you sell an operating wash, the purchase price gets allocated among equipment, real estate and goodwill on Form 8594, and your depreciation history and that allocation have to agree.
If you placed the site in service in a prior year on a 39-year schedule, a lookback study supports an automatic change in accounting method on Form 3115, and the missed depreciation lands on the current return as a Section 481(a) adjustment at the bonus rate of the original placed-in-service year, with no amended returns. Cost Seg America prepares the 481(a) computation and, for a separate fee, the Form 3115; your CPA files it. The deadline is the filing date of the return, extensions included.
Improvements, such as a new tunnel, replaced wash equipment, a vacuum expansion or a store remodel, get their own analysis. Replacing a major component raises the partial asset disposition question for the old one, with the election made as a rule on that year's timely filed return, and the tangible property regulations decide repair versus improvement. If you built the site, you hold pay applications and invoices, the best documentation there is.
The Audit Techniques Guide lists what a quality study contains: a described methodology, a detailed engineering approach, actual cost data where it exists, a tie-out to total depreciable basis, and qualified people with construction and engineering backgrounds. A wash or a fuel site defeats a template. A provider who has never studied a reclaim system or asked what a fuel canopy is bolted to will guess, and a guess does not survive an examiner's question. Our team has prepared and defended engineered studies since 2002, through more than 125 IRS examinations with zero losses and $0 returned. If you are comparing providers, ask which of the six approaches the study uses and whether the report carries a component schedule with a cost and a source for each line.
Bring the closing statement and purchase agreement, any purchase price allocation, the equipment list or bill of sale, the tax assessment for the land split, site plans, contractor invoices for anything you built, equipment specifications and photos. The land allocation is the number that is set before the study starts.
Below $180,000 of depreciable basis after land, the fee eats the benefit. If you plan to sell within two or three years, 1245 recapture on an equipment-heavy site usually outweighs the time value. If you are a passive investor with no passive income and no plan to sell, the loss sits in a carryforward you paid to create. If the price is mostly land on a corner lot, there is little to reclassify. Section 179 can also apply to equipment you buy separately, subject to its dollar and income limits, and your CPA should model it alongside bonus.
Yes. It is one of the most equipment-heavy property types there is, and the wash equipment, reclaim system, dedicated electrical and site work are separated from the 39-year building by an engineered study.
Tunnel washes tend to land at the high end of the 20 to 35 percent range. Only a study of your site can document the number.
Yes. Dispensers, point-of-sale, refrigeration, food service equipment and the paving and lighting are the usual items. Tanks, piping and the canopy are decided on the facts.
No. A lookback study with Form 3115 catches up the missed depreciation on your current return at the 100 percent bonus rate that applied in 2022, with no amended returns.
Only if the loss is non-passive: you materially participate in operating the wash, or you qualify as a real estate professional and materially participate in a rental. Otherwise it offsets passive income and carries forward.
Yes, for qualifying property acquired and placed in service after January 19, 2025, permanently. Bonus is automatic; the election is to opt out.
Some of it. Depreciation on the equipment comes back as ordinary income; depreciation on the building comes back at up to 25 percent. A 1031 exchange can defer both, subject to the replacement property carrying enough Section 1245 property.
An in-house analyst does a proper inspection on larger properties. On others the team walks it with you on a live video call, or you follow a guided photo and video checklist and the team reviews every frame.
Send Jim Dougherty and his team the purchase price, the closing date, the land allocation, the equipment list and the entity that holds the site. You will have a free proposal in 24 hours showing what a fully engineered and accounted study would move and what it would cost, the study in 30 days with rush available, and a plain answer if a study is not right for your site. Call 1-888-365-5023 or email info@costsegamerica.com, and bring your CPA.
This article is for educational purposes only and is not tax, legal or accounting advice; the examples are hypothetical, so confirm your facts with your CPA before acting.
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