The tax rules for property improvements split spending into two buckets. Work that betters the property, extends its life, or adapts it to a new use must be capitalized, meaning the cost is added to the property’s basis rather than deducted right away. Routine repairs that just keep things running can usually be deducted in the year you pay for them. On rental and business property, capitalized improvements come back to you through annual depreciation; on a personal home, they come back as a smaller taxable gain when you sell. Misclassifying the two is a common source of IRS adjustments, back tax, and interest.
Repair or Improvement? The BAR Test
The IRS decides whether an expenditure is an improvement using a three-part framework spelled out in Treasury Regulation 1.263(a)-3: Betterment, Adaptation, and Restoration. If the work meets any one of the three, you capitalize it. The analysis applies to the relevant “unit of property,” and for a building each major system — plumbing, electrical, HVAC and so on — is analyzed separately from the structure itself.1eCFR. 26 CFR 1.263(a)-3 – Amounts Paid to Improve Tangible Property
A betterment materially increases the property’s capacity, strength, or quality. Upgrading a 100-amp electrical panel to 200-amp service, or swapping basic shingles for architectural-grade roofing, qualifies.
An adaptation changes the property to a new or different use. Converting a garage into a rental apartment, or turning retail space into a medical office, qualifies.
A restoration returns the property to working condition after deterioration or replaces a major component. Replacing every window in a building, or installing an entirely new HVAC system, qualifies.
A plain repair, by contrast, keeps the property in its current operating condition without meaningfully improving it. Fixing a leaky faucet, patching a small roof section, or repainting a room are standard repairs, and on rental or business property you deduct them in full the year you pay them.2Internal Revenue Service. Topic No. 414 Rental Income and Expenses
One trap: if you bundle several individual repairs into a broader renovation, the IRS can reclassify the whole project as a single improvement under the “plan of rehabilitation” doctrine. A series of technically minor fixes done during 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 require capitalization. Each is elected annually by attaching a statement to a timely filed return.
De Minimis Safe Harbor
The de minimis safe harbor covers low-cost items. If you have an applicable financial statement (an audited financial statement, for most purposes), 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 if you buy multiple items on one invoice the cap applies to the invoice total unless each piece is itemized separately. Keep the itemized invoices.
Safe Harbor for Small Taxpayers
If a building has an unadjusted basis of $1 million or less, you can expense repair and improvement costs on it as long as the total spent during the year doesn’t exceed the lesser of $10,000 or 2% of the building’s unadjusted basis. This is a straightforward option 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 for building structures and systems qualifies here. The work has to be upkeep that keeps the property in ordinary operating condition. This safe harbor does not cover betterments, but it does cover certain component replacements that would otherwise count as restorations.4Internal Revenue Service. Tangible Property Final Regulations – Section: Safe Harbor for Routine Maintenance
What Gets Added to Basis
Once an expenditure is classified as an improvement, every cost tied to completing it gets added to the property’s basis. Basis is the property’s cost for tax purposes, starting with purchase price and growing with each capitalized improvement.
Direct costs are the obvious ones: materials and contractor labor. Indirect costs count too. Architect and engineering fees, building permits, mandatory inspections, and interest on a construction loan all get folded in. If you had to demolish or remove an old component to install the new one, those demolition costs are capitalized as part of the new improvement.
You cannot capitalize the value of your own labor. If you do the work yourself, you add the cost of materials and other 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 to retain property records until the statute of limitations expires for the tax year in which you dispose of the property.5Internal Revenue Service. How Long Should I Keep Records? In practice, that means holding records as long as you own the property plus at least three years after you file the return for the year of sale. For rental property, where depreciation deductions compound the stakes, this often runs into decades.
Depreciating Improvements on Rental and Business Property
When you capitalize an improvement on income-producing property, you recover the cost 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
Residential rental property (apartments, rental houses) uses a 27.5-year recovery period. Nonresidential real property (offices, retail, warehouses) uses 39 years. Both use straight-line depreciation.7Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System Depreciation starts in the middle of the month the improvement is placed in service, so a $55,000 improvement on residential rental property yields roughly $2,000 a year ($55,000 ÷ 27.5), with partial deductions in the first and last years. You report it on Form 4562 and carry rental amounts to Schedule E.8Internal Revenue Service. About Form 4562, Depreciation and Amortization
Each improvement has its own schedule, independent of the original building. A rental property improved several times over the years will have multiple schedules running 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 excludes building enlargements, elevators, escalators, and 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 rather than 39, significantly accelerating the tax benefit for commercial renovations.
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 QIP and other qualifying property can be written off in full the year placed in service.
Section 179 is another route to immediate expensing. For tax years beginning in 2026, the Section 179 deduction limit is $2,560,000, with a phase-out beginning at $4,090,000 in total qualifying property placed in service. QIP is specifically eligible for Section 179, as are certain nonresidential building improvements such as roofs, HVAC systems, fire protection, and security systems.10Internal Revenue Service. Publication 946 – How To Depreciate Property
Practical difference: bonus depreciation is mandatory unless you elect out, and it applies even if you have a net loss. Section 179 cannot create or increase a business loss, so limited income can cap it while bonus depreciation keeps flowing.
The Partial Disposition Election
When you replace a major building component on rental property, you capitalize the new piece. The old one leaves a question: without action, the remaining undepreciated basis of the discarded component stays on your books, and you keep depreciating something sitting in a dumpster.
The partial disposition election lets you recognize a loss on the removed component in the year of disposition. You identify the old component, determine its remaining adjusted basis, and report the loss on your return. No special form is required; 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 Replace 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 you can claim alongside starting depreciation on the new roof. Experienced landlords use this election routinely; newer ones often miss it.
Depreciation Recapture When You Sell
Depreciation gives you tax benefits on the way in, and the IRS takes some of it back when you sell. The gain attributable to depreciation claimed on real property is “unrecaptured Section 1250 gain,” taxed at a maximum rate of 25% rather than 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
Say you bought a rental for $300,000 (excluding land), claimed $80,000 in depreciation, and sold for $400,000. Adjusted basis is $220,000, gain is $180,000. The first $80,000 (the depreciation you claimed) is taxed at up to 25%. The remaining $100,000 is taxed at your long-term capital gains rate, 15% or 20% for most taxpayers.
You cannot avoid recapture by skipping depreciation deductions. The IRS calculates recapture based on the depreciation you were entitled to claim, whether you actually claimed it or not. Not depreciating means losing the annual deductions without reducing the eventual recapture bill.
Improvements to Your Primary Home
A personal home follows a different pattern. You can’t depreciate it because it isn’t income-producing. The payoff comes at sale: every capitalized improvement raises your adjusted basis and reduces the taxable gain.
Buy for $300,000, spend $50,000 over the years on improvements (new roof, kitchen remodel, bathroom addition), and your adjusted basis is $350,000. Sell for $600,000, and your realized gain is $250,000.
That gain then 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 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 In the example above, the single filer owes nothing on the $250,000 gain, and a married couple is well within the limit.
Capitalized improvements matter most when gains exceed the exclusion. A homeowner who bought decades ago in a market that appreciated sharply may face gain well above $250,000 or $500,000, and every documented improvement reduces that overage dollar for dollar. Without records, basis defaults to the original purchase price and the tax hit can be substantial.
When a sale produces gain above the exclusion, you report it on Form 8949 and Schedule D, showing adjusted basis (including improvements) and the resulting gain. If the entire gain falls within the exclusion but you received a Form 1099-S, you still report the sale; the excluded portion isn’t taxed. Start a file for improvement receipts while you own the home, not at closing.
One 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. Improvements like solar panels and heat pumps installed in 2026 still get capitalized into basis, but no longer generate a tax credit on their own.