Under the property improvement tax rules, work that betters the property, extends its life, or adapts it to a new use has to be capitalized and recovered over time, while a routine repair that just keeps things running is deducted in the year you pay for it. On rental or business property, capitalized improvements come back to you through depreciation. On a primary residence, they raise your basis and reduce the taxable gain when you sell. Misclassifying the two is a common source of IRS adjustments, back taxes, and interest.
Improvement or Repair: the BAR Test
The IRS uses a three-part framework — Betterment, Adaptation, and Restoration — to decide whether a cost is an improvement. Meeting any one prong means you capitalize. The test lives in Treasury Regulation Section 1.263(a)-3, and for a building, each major system (plumbing, electrical, HVAC, and so on) is analyzed separately from the building structure itself.1eCFR. 26 CFR 1.263(a)-3 – Amounts Paid to Improve Tangible Property
Betterment means the work materially increases capacity, strength, or quality. Upgrading a 100-amp electrical panel to 200-amp service, or swapping basic shingles for architectural-grade roofing, both qualify. Adaptation means putting the property to a new or different use, such as converting a garage into a rental apartment or turning retail space into a medical office. Restoration means returning the property to working order after deterioration or replacing a major component, like installing an entirely new HVAC system or replacing every window in a building.
A plain repair keeps the property in its current operating condition without meaningfully improving it. Fixing a leaky faucet, patching a small roof section, repainting a room. On rental or business property, you deduct these costs in full in the year you pay them.2Internal Revenue Service. Topic No. 414 Rental Income and Expenses
One warning. If you bundle several individual repairs into a broader renovation, the IRS can invoke the plan of rehabilitation doctrine and reclassify the whole project as a single improvement. A stack of technically minor fixes done in the same renovation window gets capitalized as one lump sum.
Safe Harbors That Let You Expense Instead
Three safe harbors let you deduct certain costs immediately even when they might otherwise look like improvements. Each has to be elected on a timely filed return.
De Minimis Safe Harbor
If you have an applicable financial statement (generally an audited one), you can expense items costing $5,000 or less per invoice or per item. Without one, the threshold is $2,500.3Internal Revenue Service. Tangible Property Final Regulations – Section: A De Minimis Safe Harbor Election The limit is per invoice, so multiple items on one invoice are measured against the invoice total unless each line is separately priced. Keep the itemized invoices.
Safe Harbor for Small Taxpayers
If you own a building with an unadjusted basis of $1 million or less, you can expense repair and improvement costs on that building as long as the annual total doesn’t exceed the lesser of $10,000 or 2% of the building’s unadjusted basis. This is the workhorse election for smaller landlords with lower-value properties.
Routine Maintenance Safe Harbor
Recurring maintenance you reasonably expect to perform more than once during a 10-year period on a building’s structure and systems qualifies here. The work has to be the kind of upkeep that keeps the property in ordinary operating condition. Betterments are not covered, but certain component replacements that would otherwise count as restorations are.4Internal Revenue Service. Tangible Property Final Regulations – Section: Safe Harbor for Routine Maintenance
What Goes Into a Capitalized Cost
Once a project is an improvement, every cost tied to completing it gets added to the property’s basis. Direct costs are the obvious pieces: materials and contractor labor. Indirect costs count too, including architect and engineering fees, building permits, mandatory inspections, and interest on a construction loan. If you had to demolish or remove an old component to install the new one (tearing out old kitchen cabinets before a remodel, for example), those removal costs are also capitalized as part of the new improvement.
You cannot capitalize the value of your own labor. Do the work yourself, and you add materials and out-of-pocket expenses to basis, but your time has no tax value here regardless of what a contractor would have charged.
Keep every invoice, contract, canceled check, and permit receipt. The IRS says property records should be kept until the statute of limitations runs on the tax year in which you dispose of the property.5Internal Revenue Service. How Long Should I Keep Records? In practice, that means holding onto improvement records for as long as you own the property plus at least three years after you file for the year you sell. For rental property with layered depreciation schedules, that can easily mean decades.
Depreciating Improvements on Rental and Business Property
Once capitalized on income-producing property, an improvement is recovered through depreciation under the Modified Accelerated Cost Recovery System (MACRS), the required method for property placed in service after 1986.6Internal Revenue Service. Topic No. 704, Depreciation
Recovery periods depend on the property type. Residential rental property uses 27.5 years. Nonresidential real property (offices, retail, warehouses) uses 39 years. Both use straight-line depreciation, so the annual deduction is the same each full year.7Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System A $55,000 improvement on a residential rental yields roughly $2,000 a year, with partial deductions in the first and last years under the mid-month convention. You report it on Form 4562 and carry it to Schedule E.8Internal Revenue Service. About Form 4562, Depreciation and Amortization
Each improvement gets its own depreciation schedule, running independently of the building. A property improved several times over the years will have several schedules going at once. Land is never depreciable.
Qualified Improvement Property
Qualified improvement property (QIP) is any improvement to the interior of a nonresidential building placed in service after the building was first used. It does not include enlargements, elevators, escalators, or changes to the internal structural framework.7Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System QIP uses a 15-year recovery period instead of 39, which meaningfully accelerates the benefit for commercial owners and tenants renovating interiors.
Bonus Depreciation and Section 179
For property placed in service in 2026, the One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualifying assets acquired after January 19, 2025.9Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill That reverses the phase-down that had taken bonus depreciation to 80% in 2023 and 60% in 2024. QIP and other qualifying property can now be written off in full in the year placed in service.
Section 179 is another route to immediate expensing. For tax years beginning in 2026, the deduction limit is $2,560,000, with a phase-out beginning at $4,090,000 in qualifying property placed in service. QIP is Section 179-eligible, as are certain nonresidential building improvements like roofs, HVAC, fire protection, and security systems.10Internal Revenue Service. Publication 946 – How To Depreciate Property
The two tools behave differently. Bonus depreciation applies automatically unless you elect out and works even when you have a net loss. Section 179 cannot create or increase a business loss, so it can be capped when income is limited.
The Partial Disposition Election
Replacing a major building component (a roof, an HVAC system, a plumbing run) means capitalizing the new one. Without action, the undepreciated basis of the old component keeps sitting on your books, and you keep depreciating something that’s in a dumpster.
The partial disposition election lets you recognize a loss on the removed component in the year it goes. You identify the old piece, calculate its remaining adjusted basis, and report the loss. No special form is needed; you make the election by reporting the disposition on a timely filed return.11Internal Revenue Service. Examining a Taxpayer Electing a Partial Disposition of a Building Experienced landlords rarely miss this one; newer ones often do. Put a $15,000 roof on a building where the old roof still had $8,000 of undepreciated basis, and that’s an $8,000 loss claimable alongside the new depreciation.
Depreciation Recapture at Sale
Depreciation gives back some of what it gave. On sale, the portion of gain attributable to depreciation claimed on real property is unrecaptured Section 1250 gain, taxed at a maximum rate of 25% rather than at the lower long-term capital gains rates that apply to the rest of the profit.12Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
An example. You bought a rental for $300,000 (excluding land), claimed $80,000 of depreciation over the years, and sell for $400,000. Adjusted basis is $220,000, gain is $180,000. The first $80,000 is taxed at up to 25%. The remaining $100,000 is taxed at your applicable long-term capital gains rate, generally 15% or 20%.
Skipping depreciation does not spare you from recapture. The IRS calculates recapture based on the depreciation you were entitled to claim, whether or not you actually claimed it. Not depreciating means losing the annual deduction without reducing the eventual recapture bill.
How Primary Residences Are Different
Improvements to your personal home follow a different pattern. You cannot depreciate a primary residence, because it isn’t income-producing. Instead, every capitalized improvement raises your adjusted basis, and that reduces the taxable gain when you sell.
Buy a home for $300,000, spend $50,000 over the years on a new roof, a kitchen remodel, and a bathroom addition, and your basis is $350,000. Sell for $600,000, and your realized gain is $250,000.
That gain runs through the Section 121 exclusion. If you’ve owned and lived in the home as your primary residence for at least two of the five years before the sale, you can exclude up to $250,000 of gain as a single filer, or up to $500,000 if married filing jointly.13Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence The single filer above would owe nothing on that $250,000. A married couple would be well within the limit.
Improvements matter most when gains exceed those thresholds. A homeowner who bought decades ago in a market that appreciated sharply can easily face gain above $250,000 or $500,000, and every documented improvement reduces that overage dollar for dollar. Without records, you’re stuck with the original purchase price as basis, and the tax hit gets ugly.
When a home sale produces gain above the exclusion, you report the transaction on Form 8949 and Schedule D, showing the adjusted basis and the resulting gain. If the entire gain falls within the exclusion but you received a Form 1099-S, you still report the sale, though the excluded portion isn’t taxed. Start the improvement file when you buy the house, not when you list it.
One boundary to note for 2026: the residential clean energy credit (Section 25D) and the energy efficient home improvement credit (Section 25C) both expired at the end of 2025 and were not renewed. Solar panels, heat pumps, and similar improvements installed in 2026 still get added to your basis, but they no longer generate a credit of their own.