Capital Repairs: IRS Tests, Safe Harbors, and Depreciation

Under the IRS capital repairs rules, you must capitalize any amount you spend on tangible business property that betters it, restores it, or adapts it to a new use; ordinary repairs that just keep the property working stay deductible in the year you pay for them.¹ Getting the classification wrong cuts both ways. Deducting a capital improvement understates taxable income and invites adjustment on audit. Capitalizing a genuine repair inflates your asset basis and pushes a deduction you were entitled to now into years of slow depreciation.

What Counts as a Repair and What Doesn’t

A repair keeps property in its existing working condition. Patching a roof leak, repainting after water damage, replacing a broken window pane. You deduct the cost the year you incur it.¹

A capital improvement is something more. Section 263 disallows an immediate deduction for permanent improvements or betterments that increase property value, and for amounts spent restoring property.² Those costs get added to the property’s basis and recovered over years through depreciation. Replacing a whole roof, installing a new HVAC system, or converting a warehouse into retail space sit on this side.

Real spending rarely announces itself as “patch” or “replace” in tidy terms. The regulations give you a framework to decide.

Start with the Unit of Property

Before applying any test, identify what unit of property you’re spending on. This step drives the outcome. The smaller the unit, the more likely a given cost looks like a capital improvement rather than incidental maintenance.

Buildings get special handling. The IRS treats the building structure and each of its major building systems as separate units for this analysis. Those systems include plumbing, electrical, HVAC, elevators, escalators, fire protection and alarm, gas distribution, and security.¹ Betterment, restoration, and adaptation get tested against each system on its own. Replacing most of a building’s plumbing is measured against the plumbing system alone, not the whole building, so it almost certainly capitalizes even though it’s a small fraction of overall building value.

For property other than buildings, the unit of property includes all components that are functionally interdependent, meaning you can’t place one in service without the others.¹ A delivery truck is generally one unit.

The Three Tests That Force Capitalization

Once the unit is set, every expenditure runs through three tests. Trigger any one of them and you capitalize.¹

Betterment

An expenditure is a betterment if it fixes a pre-existing defect present when you acquired the property, or if it materially increases capacity, productivity, efficiency, strength, or quality. Buying a building with a known foundation problem and then fixing the foundation is a betterment because the defect existed at acquisition. Swapping a standard HVAC unit for a high-efficiency model that measurably lowers energy use also qualifies, because it pushes performance beyond the prior level. Physical expansions such as added square footage or an extra loading bay count as well.

Restoration

Restoration catches expensive replacements even when the old part was still limping along. It applies when you bring the property back from a nonfunctioning state, when you replace a major component or substantial structural part, when you rebuild property to a like-new condition after the end of its class life, or when you replace a component for which you previously took a loss or that you capitalized separately at acquisition. If the tax system already treated the old component as a distinct item, the replacement gets the same treatment.

Adaptation

Adaptation looks at function. If the expenditure adapts the property to a new or different use, it capitalizes. Converting a residential rental into a medical office, retrofitting a warehouse for cold storage, or installing commercial kitchen infrastructure in what was general office space all trigger the test. Layout reconfiguration, utility upgrades, and specialized equipment tied to the new use go into basis.

Safe Harbors That Let You Deduct Anyway

Applied mechanically, the three tests would force capitalization of many small or predictable costs. Three safe harbors let you skip the analysis.

De Minimis Safe Harbor

The de minimis safe harbor lets you immediately deduct small-dollar property purchases that might otherwise capitalize. The ceiling depends on whether you have an applicable financial statement (AFS), which generally means audited financials prepared under GAAP.

With an AFS: up to $5,000 per invoice or per item.
Without an AFS: up to $2,500 per invoice or per item.¹

You make the election annually by attaching a statement titled “Section 1.263(a)-1(f) de minimis safe harbor election” to a timely filed return, including extensions. Taxpayers with an AFS must have a written capitalization policy in place at the start of the tax year. Taxpayers without an AFS don’t need a formal written policy but must expense the amounts on their books consistently under a procedure that exists at the start of the year.¹

A common mistake: assuming anything under $5,000 is deductible. Without audited financials, your ceiling is $2,500. Deducting a $4,000 equipment purchase without an AFS puts you outside the safe harbor.

Routine Maintenance Safe Harbor

This one covers recurring activities you reasonably expect to perform more than once during a property’s class life to keep it in ordinary working condition. Regular repainting of a commercial building, filter and belt replacements on machinery, scheduled HVAC servicing. For buildings the window is longer: the activity must be one you expect to perform more than once during a 10-year period.

This is a method of accounting, not an annual election on the return. And it doesn’t cover work that qualifies as a betterment or adaptation. If your “maintenance” actually upgrades performance beyond the original level, the betterment test overrides no matter how routine the schedule sounds.

Small Taxpayer Safe Harbor for Buildings

Own or lease a building with an unadjusted basis of $1 million or less (excluding land)? You may qualify to deduct the full cost of repairs, maintenance, and improvements to that building for the year, as long as the total doesn’t exceed the lesser of $10,000 or 2% of the building’s unadjusted basis. A landlord with a $400,000 building can deduct up to $8,000 in combined repair and improvement costs without ever running the three-test analysis. You elect annually on your return, building by building.

How Capitalized Costs Come Back to You

When a cost must be capitalized, it goes into basis and comes out through depreciation. The clock starts when the property is placed in service, meaning ready and available for its intended use, even if you haven’t actually started using it.³

MACRS

Most business property depreciates under the Modified Accelerated Cost Recovery System, which assigns recovery periods by asset class. Nonresidential real property is 39 years, residential rental is 27.5 years, and most equipment and machinery falls into 5-year or 7-year classes. An improvement to existing property is treated as a separate depreciable asset with the same property class the underlying property would have if placed in service on the improvement’s date.³ A new roof on a commercial building starts its own fresh 39-year schedule.

Section 179

Section 179 lets you deduct the full cost of qualifying property in the year of placement rather than over the recovery period. For 2026 the maximum is $2,560,000, phasing out dollar-for-dollar once total qualifying property placed in service for the year exceeds $4,090,000. It applies to tangible personal property (equipment, machinery, vehicles) and to qualified improvement property for the interior of nonresidential buildings. It does not apply to the building structure itself or to residential rental property. The deduction is capped at your taxable income from active business operations, with unused amounts carrying forward.

Bonus Depreciation

The One, Big, Beautiful Bill made 100% bonus depreciation permanent for qualified property acquired after January 19, 2025.⁴ The full cost of eligible property is deductible in the first year, with no dollar cap and no taxable income limitation. Bonus applies automatically unless you elect out. Taxpayers who prefer to spread deductions can elect a reduced 40% first-year rate.⁵

Between Section 179 and bonus depreciation, many businesses can now deduct the full cost of a capitalized improvement in year one. Classification still matters. You need to correctly identify the item as a capital improvement, add it to basis, and then claim the accelerated deduction. Skipping the capitalization step and simply expensing the cost as a “repair” creates an accounting method problem even if the year-one tax result looks the same.

The Partial Disposition Election

Replace a component of a larger asset and the new component capitalizes. What about the old one you tore out? Without action, its remaining undepreciated basis stays embedded in the overall asset and you keep depreciating it as if it were still there. You end up depreciating two roofs, two HVAC systems, or two floors at once while the old one sits in a dumpster.

The partial disposition election fixes that. Treating the replaced component as disposed of lets you recognize a loss equal to its remaining adjusted basis in the year of replacement. For large-dollar component replacements on commercial buildings, this can be significant. You make the election on the return for the year of the disposition. If you missed it in a prior year, a change in accounting method may let you pick it up retroactively. It’s one of the most overlooked items in the tangible property regulations for building owners who have done meaningful component work.

Fixing Prior Misclassification

If you’ve been capitalizing costs that should have been repairs, or deducting costs that should have been capitalized, you can’t just change direction on next year’s return. The IRS requires Form 3115 (Application for Change in Accounting Method) to switch between expensing and capitalizing tangible property expenditures.⁶

Many of these changes qualify for automatic consent, meaning no prior IRS approval is needed. You file Form 3115 with your return and compute a Section 481(a) adjustment, which prevents income from being double-counted or skipped in the transition.⁷ A positive adjustment above $3,000 may be spread over multiple years.

The most common scenario: a business has been capitalizing routine repairs for years, inflating its basis and missing current deductions. Form 3115 lets it catch up by deducting all the overcapitalized amounts in one year through a favorable 481(a) adjustment. It’s available even for errors going back many years. If you suspect prior returns have handled repairs inconsistently, this is worth reviewing with a tax professional before it surfaces on audit.

Materials and Supplies

Tangible property that qualifies as “materials and supplies” gets simpler treatment. Items with a useful life of 12 months or less, items costing $200 or less, and components acquired to maintain or repair property you own generally qualify and are deductible when first used or consumed in operations.⁸

The boundary: materials used to improve property rather than maintain it still fall under the improvement rules. Replacement filters for an HVAC system are deductible as materials and supplies. Materials used to build an addition to the building are not.

1
Internal Revenue Service. Tangible Property Regulations – Frequently Asked Questions
2
Office of the Law Revision Counsel. 26 U.S. Code 263 – Capital Expenditures
3
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
4
Internal Revenue Service. One, Big, Beautiful Bill Provisions
5
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
6
Internal Revenue Service. Revenue Procedure 2024-23 – List of Automatic Changes
7
Office of the Law Revision Counsel. 26 U.S. Code 481 – Adjustments Required by Changes in Method of Accounting
8
eCFR. 26 CFR 1.162-3 – Materials and Supplies