Capital Expenses in Real Estate: Depreciation, Safe Harbors, and Basis

Capital expenses in real estate are the costs you pay to acquire, improve, or substantially restore a property, as opposed to the routine costs of keeping it running. The IRS won’t let you deduct these amounts in the year you spend the money. Instead, you add them to the property’s tax basis and recover them over time through depreciation, and what’s left in basis reduces your taxable gain when you sell. Miscategorize a cost in either direction and it costs you: capitalize a true repair and you wait years for a deduction you could have taken now; deduct a real improvement and you’re exposed to back taxes and penalties.

How the IRS Decides Something Is a Capital Expense

The test is called BAR, for betterment, adaptation, and restoration. If the work does any one of the three, it’s a capital improvement and has to be capitalized.¹

A betterment fixes a pre-existing defect, enlarges the property, or materially increases the capacity or quality of a building system. Adding a bathroom, expanding a kitchen, or upgrading an electrical panel from 100 amps to 200 amps all qualify. An adaptation changes how the property is used, such as converting a residential garage into a commercial office or an unfinished basement into a rental apartment. A restoration brings a property back from a nonfunctioning state, replaces a major component or substantial structural part, or rebuilds it to like-new condition after the end of its depreciation class life.¹

The logic is simple. If the work creates or extends value past the current tax year, the deduction has to be spread across the useful life of that value.

Repair or Improvement: Where the Line Actually Falls

Most disputes with the IRS happen here, because the definitions sound cleaner than the reality. A repair keeps the property in its current working condition. An improvement makes it better, adapts it to a new use, or restores it from disrepair.

Some calls are easy. Patching a small roof leak is a repair; replacing the entire roof is capital because you’re swapping out a major structural component.¹ Fixing a leaky faucet is a repair; replumbing the building is capital. Repainting after normal wear is a repair; gutting and rebuilding the interior is an improvement.

The middle cases are harder. Replacing one broken window is a repair. Replacing every window with energy-efficient units starts to look like a betterment. The IRS analyzes the work against the “unit of property,” which for buildings means the whole structure or one of its major systems: HVAC, plumbing, electrical, elevators, escalators, fire protection, security, or gas distribution. Replace a substantial part of any one of those systems and the cost is almost always capital, whatever your accounting labels it.

What Typically Gets Capitalized

Structural Additions and Expansions

Anything that physically enlarges the property is capital. New bedrooms, a second story, a bigger kitchen footprint, a deck, or finishing raw basement or attic space all qualify as betterments.

Major System Replacements

Installing a new HVAC system, replacing the roof, rewiring the electrical, or putting in new plumbing lines all count. These replace major components the IRS treats as integral building systems. The old system doesn’t have to be dead; a full replacement is a restoration or betterment either way.

Site and Land Improvements

Paving a driveway, building a retaining wall, installing fencing, pouring sidewalks, and major landscaping like planting large trees are all capital. The IRS treats these as land improvements with their own depreciation schedule, separate from the building.²

Use Conversions

Turning a house into office space, a retail storefront into a restaurant, or a garage into a rental unit hits the adaptation prong. The costs to make the conversion have to be capitalized because the space is being put to a fundamentally different use.

How You Recover the Money: Depreciation Schedules

When you capitalize a cost, you get it back through annual depreciation over the recovery period the Modified Accelerated Cost Recovery System (MACRS) assigns to that asset. The schedule matters a lot for cash flow.

5-year property: appliances (stoves, refrigerators), carpeting, and furniture placed in a residential rental.³
7-year property: office furniture and certain commercial fixtures.
15-year property: land improvements such as fences, roads, sidewalks, bridges, and shrubbery; also qualified improvement property (interior improvements to nonresidential buildings).²
27.5-year property: the residential rental building itself, including built-in components like furnaces, water pipes, and venting.³
39-year property: nonresidential real property (commercial buildings and their structural components).²

The gap is large. A $10,000 refrigerator in a rental generates roughly $2,000 a year in depreciation over five years. That same $10,000 spent on a structural addition to a residential rental building yields about $364 a year over 27.5 years. When you’re planning work, sequencing it around the shorter categories can change the tax picture significantly.

Ways to Pull the Deduction Forward

Two provisions let you write off qualifying capital costs much faster than the standard schedule, and a third technique (a cost segregation study) is what makes the first two really pay.

100% Bonus Depreciation

The One, Big, Beautiful Bill signed in 2025 made 100% first-year bonus depreciation permanent for qualified property acquired after January 19, 2025.⁴ Qualified property generally means assets with a MACRS recovery period of 20 years or less, which covers 5-year property like appliances, 7-year property like office furniture, and 15-year property like land improvements and qualified improvement property.⁵

The building shell itself doesn’t qualify, because 27.5 and 39 years both exceed the 20-year threshold. So if you spend $200,000 renovating a commercial building and a cost segregation study identifies $60,000 as 15-year qualified improvement property, you can write off that $60,000 in year one while depreciating the remaining $140,000 over 39 years.

Section 179 Expensing

Section 179 lets you deduct the full cost of qualifying property in the year it’s placed in service, up to $2,560,000 for 2026. The deduction phases out dollar-for-dollar once total qualifying purchases exceed $4,090,000 in a tax year. Eligible real-estate improvements include roofs, HVAC systems, fire protection and alarm systems, security systems, and qualified improvement property on nonresidential buildings.²

One catch: Section 179 can’t create or increase a net operating loss. Your deduction is capped at your taxable income from active business operations. Bonus depreciation has no such income limit, which is why many investors reach for it first when both are on the table.

Qualified Improvement Property

Qualified improvement property (QIP) sits at the intersection of these accelerators. QIP is any improvement to the interior of a nonresidential building made after the building was first placed in service. It excludes enlargements, elevators and escalators, and changes to the internal structural framework.⁵ QIP is 15-year property and qualifies for both 100% bonus depreciation and Section 179. If you’re renovating a commercial retail or office interior, most of the work is likely QIP.

Cost Segregation Studies

A cost segregation study is an engineering-based analysis that breaks a building into its components and reclassifies as many as possible into shorter categories. Without one, the whole building typically depreciates over 27.5 or 39 years. After one, portions get moved into 5-year, 7-year, and 15-year buckets and become eligible for bonus depreciation. Interior finishes, certain electrical work, decorative lighting, parking lots, landscaping, and specialized plumbing often shift into shorter periods.

Fees generally run from a few thousand dollars for smaller residential rentals to $10,000 or more for larger commercial properties. Many studies produce first-year tax savings that are ten to forty times the cost of the study. The economics work best for properties you plan to hold for several years with a purchase price or renovation budget of at least $500,000.

Ways to Skip Capitalization Entirely

Three safe harbors let you deduct costs immediately even if the work might otherwise be capital. Each requires an election on your return.

De Minimis Safe Harbor

If you have an applicable financial statement (audited or reviewed financials), you can expense items costing $5,000 or less per item or invoice. Without one, the threshold is $2,500 per item or invoice. A landlord who buys a $2,200 dishwasher for a unit can deduct the full cost rather than depreciating it over five years.

Safe Harbor for Small Taxpayers

If your average annual gross receipts are $10 million or less and the building has an unadjusted basis under $1 million, you can deduct repair, maintenance, and improvement costs on that building so long as the total doesn’t exceed the lesser of 2% of the building’s unadjusted basis or $10,000 for the year.¹ For a building with a $400,000 basis, the cap is $8,000. Useful for small landlords whose annual work stays modest.

Routine Maintenance Safe Harbor

You can deduct recurring maintenance you reasonably expect to perform more than once during the first ten years after placing a building or building system in service. The work has to keep the property in ordinarily efficient operating condition, not improve it.¹ Resealing a flat roof every seven years or servicing an HVAC system annually qualifies. Replacing the whole roof does not, because you wouldn’t expect to do that more than once in ten years.

What Capital Expenses Do to Your Basis at Sale

Every dollar you capitalize gets added to your property’s adjusted basis, which the IRS uses to figure your gain or loss when you sell. Buy a rental for $300,000, spend $80,000 on capital improvements, and your starting adjusted basis is $380,000 before accumulated depreciation. Sell for $500,000 and the taxable gain is measured against the higher basis, not the original price.³

This matters for personal residences too. If you sell your home for a profit above the capital gains exclusion ($250,000 single, $500,000 married filing jointly), each documented capital improvement reduces the taxable gain.⁶ The 2018 kitchen renovation or the roof you put on in 2022 can cut your tax at sale, but only if you kept the receipts.

Depreciation you claimed (or were allowed to claim) reduces basis. Capitalize a $50,000 improvement, take $20,000 of depreciation before selling, and only $30,000 of that improvement remains in basis. The IRS also recaptures depreciation at a 25% rate on the sale of rental property, another reason to track capital costs precisely from day one.

Partial Disposition When You Replace a Component

When you replace a major building component, such as swapping an old roof for a new one, the IRS allows a partial disposition election. You write off the remaining undepreciated value of the old component as a loss in the year it’s removed, then capitalize the new component as a separate asset going forward.⁷

Skip the election and the old roof’s remaining basis stays buried in the building’s depreciation schedule, so you effectively depreciate the old and new components at the same time with no loss to recognize. The election prevents that overlap and can produce a real deduction the year of replacement. On a roof originally worth $80,000 in a building placed in service ten years ago, remaining undepreciated basis could easily exceed $50,000, all deductible as a loss under the election.

You have to make the election on a timely filed return (including extensions) for the year of disposition. Miss it and you may be able to claim it retroactively through an accounting method change, but that route adds cost and complexity.

Records to Keep, and for How Long

Documentation is what holds your capital-expense position together on audit. For each project, keep the contractor’s written proposal or contract describing the work, itemized invoices, and proof of payment such as bank statements or canceled checks. Before-and-after photographs aren’t required but help. If you’re using a safe harbor, keep the election and the calculations behind your eligibility.

The retention timeline is longer than most people expect. The IRS says to keep property records until the statute of limitations expires for the year you dispose of the property, not the year you did the work.⁸ In practice, that means holding improvement records for the entire time you own the property plus another three to seven years after the sale. If you don’t report more than 25% of your gross income, the window extends to six years. If you never file, there’s no expiration at all.

Digital records are fine. The IRS accepts electronic storage systems that maintain accuracy, prevent unauthorized alteration, offer indexed retrieval, and can produce legible hard copies on demand.⁹ Scanning receipts into cloud accounting software meets those standards for most owners, but hold the originals until you’ve verified the scans and have a backup.

1
Internal Revenue Service. Tangible Property Final Regulations – Frequently Asked Questions
2
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
3
Internal Revenue Service. Publication 527 (2025), Residential Rental Property
4
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
5
Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System
6
Internal Revenue Service. Property (Basis, Sale of Home, Etc.) 3
7
eCFR. 26 CFR 1.168(i)-8 – Dispositions of MACRS Property
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Internal Revenue Service. How Long Should I Keep Records?
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Internal Revenue Service. Revenue Procedure 97-22