Issues

Repair or Improvement? Fighting IRS Capitalization in Tax Court

The IRS recharacterized your repairs as capital improvements. Here is how the tangible property regulations decide it—and how to fight back.

You deducted the cost of fixing up your business or rental property—a roof job, an HVAC fix, rewiring, a plumbing overhaul—as repairs and maintenance. Then the exam report landed. Form 4549, with its narrative explanation on Form 886-A, disallows the deduction and recharacterizes the cost as a capital improvement under IRC § 263(a), to be depreciated over 27.5 or 39 years instead. Now you hold a Notice of Deficiency, or expect one soon.

Here is the good news up front: this is one of the most winnable fact fights in tax law, because the rules are written down in unusual detail. Since 2014, the tangible property regulations have governed this exact question with concrete tests and their own binding examples—including one where a leaky roof is a deductible repair and another where the same symptom is a capital improvement. The difference is the scope of the work.

The Real Fight Is Timing

The IRS is not saying the money was never deductible. It is saying you deduct it slowly—as depreciation over 27.5 years (residential rental property) or 39 years (nonresidential real property) under IRC § 168(c)—instead of all at once. Spread an $11,000 roof job on a rental house over 27.5 years and you get roughly $400 a year instead of $11,000 now.

That timing gap creates a deficiency for the audit year, and two passengers ride along: a 20% accuracy-related penalty under IRC § 6662 and interest under IRC § 6601 running from the return's original due date.

The Legal Frame in One Minute

Two statutes pull in opposite directions, and the regulations referee.

IRC § 162(a) allows a deduction for "all the ordinary and necessary expenses paid or incurred during the taxable year in carrying on any trade or business." If your rental activity doesn't rise to a trade or business, IRC § 212 covers expenses of managing, conserving, or maintaining property held for the production of income. The regulations run the same repair-versus-capitalization analysis either way. (Whether your activity is a business at all is its own fight—see How To Prove Your Activity Is a Business, Not a Hobby.)

Pulling the other way, § 263(a) says no deduction is allowed for "new buildings or for permanent improvements or betterments made to increase the value of any property or estate," or for amounts "expended in restoring property."

The bridge between them is Reg. § 1.162-4: "A taxpayer may deduct amounts paid for repairs and maintenance to tangible property if the amounts paid are not otherwise required to be capitalized." So everything turns on one question—was this amount required to be capitalized?

Since 2014, that question has a codified answer. The final tangible property regulations, Reg. § 1.263(a)-1 and Reg. § 1.263(a)-3, generally apply to costs paid or incurred in taxable years beginning on or after January 1, 2014—which covers every year you are realistically being audited for. The older "repair vs. improvement" case law you may find online has been overtaken: the regulations carry their own tests and their own worked examples.

The IRS's own tangible property regulations FAQ frames the analysis as two steps: first identify the unit of property, then ask whether the amount improves it. Take them in order.

Step 1: Find the Unit of Property

The unit of property is the yardstick you measure the work against. A $4,000 job looks small next to a whole building and large next to a single furnace, so this threshold step quietly decides many close cases.

For real estate, Reg. § 1.263(a)-3(e) sets the rule. Each building and its structural components is a single unit of property. But the improvement analysis is applied separately to the building structure and to each of nine designated building systems:

Heating, ventilation, and air conditioning (HVAC)—motors, compressors, boilers, furnace, chillers, pipes, ducts, radiators
Plumbing systems
Electrical systems
All escalators
All elevators
Fire-protection and alarm systems
Security systems
Gas distribution system
Other systems identified in published guidance

Why you care: a furnace replacement is measured against the HVAC system, not the whole building, and a smaller yardstick makes "improvement" findings more likely. It cuts both ways—the windows example below shows the yardstick working for the taxpayer. Pin down which unit of property each disputed invoice belongs to before arguing anything else.

If you own a condominium, the unit of property is your individual unit plus its structural components.

Not everything is the building. An appliance, a fence, or a driveway is generally its own, separate unit of property—for property other than buildings, the regulation groups together only components that are functionally interdependent, meaning you cannot place one in service without the other. The same tests then run against that smaller item, and small-dollar items often resolve under the de minimis safe harbor below before any BAR analysis is needed.

Step 2: The BAR Tests

Under Reg. § 1.263(a)-3(d), an amount must be capitalized only if it improves the unit of property, and there are exactly three ways that can happen: a Betterment, a Restoration, or an Adaptation—the "BAR" tests. If the work is none of the three, it is a deductible repair under Reg. § 1.162-4. Full stop.

Betterment

Under Reg. § 1.263(a)-3(j), an amount is a betterment if it does one of three things:

Fixes a pre-existing defect—it "ameliorates a material condition or defect" that existed before you acquired the property or arose during its production, whether or not you knew about it when you bought it.
Materially adds—it is "for a material addition, including a physical enlargement, expansion, extension, or addition of a major component," or a material increase in capacity, "including additional cubic or linear space."
Materially upgrades—it is "reasonably expected to materially increase the productivity, efficiency, strength, quality, or output of the unit of property."

Notice what is not on that list: fixing something that broke or wore out during your ownership.

The Comparison Rule: Your Baseline Is Not "Brand New"

This is the most taxpayer-favorable rule in the regulations, and it is under-used. Under Reg. § 1.263(a)-3(j)(2)(iv), when work corrects damage or deterioration that happened during your use of the property, you test for a betterment by comparing the property's condition after the work with its condition "immediately prior to the circumstances necessitating the expenditure"—that is, right before the burst pipe or the tenant damage, not when the building was new.

For normal wear and tear, the baseline is the property's condition after the last time you corrected wear and tear (or when you placed it in service, if you never have). Putting the property back where it was is not a betterment. If the exam report says your repair "improved" the property because it works better than it did while broken, that is exactly the comparison the regulation forbids.

Restoration

Under Reg. § 1.263(a)-3(k), an amount restores property—and must be capitalized—if it falls into one of six buckets:

Replacing a component for which you deducted a loss
Replacing a component whose basis you took into account in a sale or exchange
Repairing casualty damage where a basis adjustment was required (subject to a limitation in (k)(4))
Returning property "to its ordinarily efficient operating condition if the property has deteriorated to a state of disrepair and is no longer functional for its intended use"
Rebuilding to like-new condition after the end of its class life
Replacing "a part or combination of parts that comprise a major component or a substantial structural part" of the unit of property

For most readers, the fight is over bucket 6. Under (k)(6), a major component is "a part or combination of parts that performs a discrete and critical function in the operation of the unit of property"—though an incidental component generally doesn't count even if its function is discrete and critical—and a substantial structural part is one that "comprises a large portion of the physical structure of the unit of property." Those are proportion words—how much of the system or structure did the work actually touch?

Bucket 4 is the other one exam reports reach for, and its standard is demanding: the property must have deteriorated to a state of disrepair and be no longer functional for its intended use. A building still rented and functioning, with a roof that leaks in heavy rain, is not "no longer functional."

Bucket 3 catches storm-damage cases. If you claimed a casualty loss for the damage and took the required basis adjustment, the repair costs must be capitalized—though under the (k)(4) limitation, only up to roughly the amount of that basis adjustment; you cannot deduct the loss and the repair for the same dollars. If that is your situation, read Medical and Casualty Loss Deduction Disputes alongside this article.

Adaptation

Under Reg. § 1.263(a)-3(l), an amount is capitalized if it adapts the property to a use "not consistent with the taxpayer's ordinary use of the unit of property at the time originally placed in service"—converting it to a different use. Fixing the plumbing in a rental that stays a rental is not an adaptation. This test is rarely the real issue in repair disputes, but check whether the exam report invokes it.

The Regs' Own Examples: Same Leak, Opposite Answers

The regulations under § 1.263(a)-3 include dozens of worked examples, and three are the heart of your argument—binding on the IRS, and written for this exact dispute.

The roof membrane—a repair. In Example 13 under paragraph (j), a building's waterproof membrane has worn out and the roof is leaking. The owner pays a contractor to put a new, comparable membrane over the worn one. The regulation's answer: not a betterment—and with no other capitalization test in play on those facts, the cost is deductible. The work put the roof back where it was.

The entire roof—an improvement. In Example 14 under paragraph (k), the roof leaks and the decking has rotted. The owner has the contractor replace the entire roof: decking, insulation, asphalt, and coatings. The answer flips: this is a restoration—replacement of a major component or substantial structural part of the building structure—and must be capitalized.

Sit with that contrast. The symptom is identical—a leaky roof. What changed is the scope of the work: a surface layer versus the whole assembly. That tells you what evidence matters: not why you did the work, but how much of the structure or system it replaced.

100 of 300 windows—a repair. Example 25 under paragraph (k) drives the proportion point home. An office building has 300 exterior windows making up 25% of its surface. The owner replaces 100 damaged windows, with no plans to replace the rest. The answer: replacing the 100 windows is not the replacement of a major component or substantial structural part, so there is no restoration—the cost is deductible. Replacing some of a component class is not automatically capital: fractions matter.

One furnace of three—but the only chiller. The regulations bracket HVAC work the same way. Replacing one of a building's three furnaces is not a restoration: the three furnaces together are a major component of the HVAC system, but a single furnace is not a significant portion of it (Example 16). Replacing the one chiller unit that cools the entire system is a restoration, because the chiller alone is a major component (Example 17). Same system, same kind of work—what decides it is how much of the system's function the replaced part carries.

What Pub 527 Tells Landlords

If your dispute involves rental property, IRS Publication 527 states the same framework in plain language: "Generally, an expense for repairing or maintaining your rental property may be deducted if you aren't required to capitalize the expense," but "You must capitalize any expense you pay to improve your rental property"—improvement meaning, as in the regulations, a betterment, restoration, or adaptation.

Pub 527's Table 1-1 lists examples of improvements: additions (bedroom, bathroom, deck, garage, porch, patio), landscaping and driveways, a heating system or central air, a septic system or water heater, built-in appliances, kitchen modernization, flooring and wall-to-wall carpeting, storm windows and doors, a new roof, wiring upgrades, and a security system. The table is illustrative, not a verdict on your facts—"new roof" there is the whole-roof Example 14, not the membrane in Example 13. If your item appears on it, expect the IRS to point at it, and be ready to show your work was narrower in scope.

The Three Safe Harbors

The regulations include three safe harbors that can end the argument before the BAR tests even start. Two are annual elections with a catch that matters in an audit, covered below.

Safe Harbor 1: De Minimis ($2,500 Per Invoice or Item)

Under Reg. § 1.263(a)-1(f), you can deduct small-dollar items instead of analyzing them. If you do not have an applicable financial statement (an AFS—essentially audited financials, which virtually no sole proprietor or landlord has), the threshold is $2,500 per invoice, or per item as substantiated by the invoice, provided you had accounting procedures in place at the start of the year under which you expense such amounts. (Without an AFS the procedures do not have to be written—but a short written expensing policy, adopted before the year starts, is the cheapest evidence you will ever create.) The reg text still says $500, but Notice 2015-82 raised the non-AFS limit to $2,500 for taxable years beginning on or after January 1, 2016, with audit protection for earlier years that used $2,500. With an AFS and written procedures, the ceiling is $5,000.

The effect is powerful: a qualifying amount is deducted, full stop—the regulation says an electing taxpayer "may not capitalize" it, even if it would otherwise be an improvement under the BAR tests. (Two caveats: § 263A can still require capitalization where the item becomes a direct or allocable cost of property you produce or improve, and the safe harbor does not cover inventory or land.)

Three mechanics to get right:

It is an annual election, made on a statement. You attach a statement titled "Section 1.263(a)-1(f) de minimis safe harbor election"—with your name, address, taxpayer identification number, and a sentence stating that you are making the de minimis safe harbor election under § 1.263(a)-1(f)—to your timely filed original return for the year, including extensions. It is not a method change; no Form 3115 is involved.
It is all-or-nothing for qualifying amounts. If you elect, it applies to all amounts meeting the requirements that year, including qualifying materials and supplies.
It is a floor, not a ceiling. Amounts above $2,500 are simply tested under the normal rules—an $8,000 job can still be a fully deductible repair under Reg. § 1.162-4. The FAQ even allows a non-AFS taxpayer whose book policy expenses larger items to deduct them "as long as you can show that your reporting policy clearly reflects your income," though without safe-harbor protection.

Safe Harbor 2: Small Taxpayers With Buildings

Reg. § 1.263(a)-3(h) gives small landlords and building owners a bright-line pass. You qualify for a given building in a given year if all three hold:

Your average annual gross receipts for the three preceding taxable years are $10,000,000 or less;
The building (owned or leased) has an unadjusted basis of $1,000,000 or less—unadjusted basis is essentially what it cost, before depreciation. Use the building's own basis: land is a separate asset, so back the land value out of your purchase price before running the numbers; and
Your total spending that year on "repairs, maintenance, improvements, and similar activities" for that building does not exceed the lesser of 2% of the building's unadjusted basis or $10,000. Amounts you deducted under the de minimis safe harbor and routine-maintenance amounts for the building count toward this total.

Run your numbers: a rental house with a $250,000 unadjusted basis gets a $5,000 ceiling (2% beats $10,000); a $600,000 building gets the full $10,000.

Two hard edges. First, under (h)(8) the safe harbor is all-or-nothing per building: if the year's total exceeds the ceiling, "the safe harbor election is not available for that eligible building property"—and everything you spent on that building falls back into the general improvement rules. It is not an item-by-item shield for the first $10,000. Second, it is an annual, per-building election, made by attaching a statement titled "Section 1.263(a)-3(h) Safe Harbor Election for Small Taxpayers"—name, address, TIN, and a description of each eligible building—to the timely filed original return, including extensions. The regulation points to §§ 301.9100-1 through 301.9100-3 as the only path for a late election. Not a method change.

Safe Harbor 3: Routine Maintenance

Reg. § 1.263(a)-3(i) deems recurring maintenance not an improvement. For buildings, the test is whether, when you placed the building structure or system in service, you reasonably expected to perform the activity more than once during the following 10 years—think scheduled HVAC servicing. Your expectation is judged at the time, and the regulation says it "will not be deemed unreasonable merely because the taxpayer does not actually perform the maintenance a second time" within the 10 years—though you must be able to substantiate that the expectation was reasonable, which is one more job for the maintenance records discussed below. For non-building property, the window is the property's class life instead of 10 years.

The exceptions in (i)(3) matter: this safe harbor does not cover betterments, adaptations, or most restorations (loss-deducted components, sale-or-exchange components, casualty restorations, and disrepair situations). And unlike the other two, routine maintenance is a method of accounting, not an annual election—a taxpayer not already following it adopts it by filing Form 3115 with a § 481(a) adjustment. In practice, for the audit year, your argument is usually the straight Reg. § 1.162-4 repair analysis plus the examples above; raise routine maintenance where your facts fit a genuine recurring schedule.

One footnote: Reg. § 1.263(a)-3(n) is an election in the opposite direction—to capitalize repair costs consistently with your books—not what a reader fighting a disallowance wants.

The Election Trap: What You Can and Cannot Fix Now

Here is the honest part. The de minimis and small-taxpayer safe harbors are annual elections that had to ride on the timely filed original return for the year in question. If you are being audited for a year where no election statement was attached, you generally cannot invoke those safe harbors for that year now. Limited relief for late elections exists under § 301.9100, but it is narrow, and neither election can be made through a Form 3115.

What survives for the audit year, no election needed:

The Reg. § 1.162-4 repair argument on the facts—the BAR tests, the unit-of-property analysis, and the regulations' own examples
The comparison rule—wear-and-tear work measured against the pre-problem baseline, not "brand new"
Routine maintenance, if it was already your method of accounting
The consolation prize below, which does not depend on any election

For future years, both elections are cheap insurance: the statements cost nothing, the titles are quoted above, and they ride on each year's timely filed original return, extensions included. Pair the de minimis election with an expensing policy adopted before the year begins.

Building Your Case

In a deficiency case, deductions are yours to prove: the burden sits with you under Tax Court Rule 142(a), though IRC § 7491(a) can shift it if you produce credible evidence and meet the substantiation and cooperation requirements. The details live in Burden of Proof in Tax Court; what matters here is what to prove:

Invoices that describe the actual work. "Replace 12 rotted deck boards and reseal" reads as a repair; "renovation" reads as capital. Ask your contractor for itemized invoices, and get any lump-sum invoice that mixes repair and improvement work broken out line by line—characterization is item-by-item, and exam reports often lump everything together and capitalize the lot. If the contractor is out of business or unresponsive, substitute what you have: canceled checks and bank or card statements, the original estimate or bid, texts and emails describing the job, your own notes, and photos. Imperfect contemporaneous records beat none. General substantiation discipline lives in How To Prove Your Business Expenses.

The triggering event, with photos. Document what necessitated the work—the leak, the tenant damage, the failed inspection—and the property's condition before and after. This is what feeds the comparison rule: it shows the work returned the property to its pre-problem condition.

Scope and proportion. Counts and fractions decide restoration cases: 100 of 300 windows, one furnace of three, a membrane versus the whole roof assembly. Get the contractor to document what fraction of the system or structure the work touched.

Maintenance history. Records of past servicing support a routine-maintenance expectation and show the work was part of keeping the property running, not upgrading it.

Your books and the filed return. Your start-of-year expensing policy and any election statements (or their absence) determine which safe harbors are in play for which years.

Then put it all in a shape a settlement can be built on: one row per disputed item—date, amount, unit of property (structure or which system), the test the exam report invoked, your answer under the regulations, and the example you rely on. Exams lump; you unlump. If the case is docketed, that same table becomes the backbone of the stipulation of facts. For organizing the underlying documents into exhibits, see How To Prepare Your Evidence for Tax Court.

Even If You Lose: The Consolation Prize

A capitalized cost is not a lost cost. If the improvement finding sticks, several things soften it—and one of them may already be missing from your exam report.

The depreciation offset—check your Form 4549. When the IRS capitalizes your repair, it is treating the amount as depreciable property, so the exam report should allow the corresponding depreciation deduction for the year or years at issue. Verify that the Form 4549 actually gave you this offset, with a sensible placed-in-service date and convention. If it didn't, that is a concrete reduction to the deficiency you can demand before arguing characterization at all.

Look beyond the audit year, too. If you filed later returns without depreciating the capitalized amount, ask the examiner to make the matching adjustments in any other year under exam, and put the amount on your depreciation schedule (Form 4562) going forward. Fixing years you already filed may take an amended return or an accounting-method change, depending on how many years are involved—see How To File an Amended Return, and get advice before picking the route.

Basis. The capitalized amount is added to the property's basis under IRC § 1016(a) and recovered through depreciation under § 168—27.5 years for residential rental property, which Pub 527 confirms, and 39 for nonresidential. You get the deduction back, just slowly. Proving and tracking basis is its own battlefield: see Cost Basis Disputes in Tax Court.

The partial disposition election. Under Reg. § 1.168(i)-8(d)(2), when a component is replaced, you may elect to treat the old component as disposed of and write off its remaining basis—the old roof comes off your books when the new one is capitalized.

Section 179 for commercial buildings. Under IRC § 179(e), roofs, HVAC, fire-protection and alarm systems, and security systems installed in nonresidential real property (after the building was first placed in service) are eligible for § 179 expensing at your election—so for a Schedule C owner of a commercial building, an "improvement" finding may cost far less than feared. It does not apply to residential rentals. For movable equipment, § 179 or bonus depreciation can moot the timing fight entirely.

The Full Exposure Picture

Before you decide how hard to fight, price the whole bill—it is more than the tax on the disallowed deduction.

Take the $11,000 roof from the top of this article, capitalized on audit for a year two returns back. These numbers are illustrative, not authority—your rate and years will differ:

Item	Schedule E landlord	Schedule C business
Deficiency base ($11,000 less the ≈$400 depreciation offset)	≈ $10,600	≈ $10,600
Added income tax (≈22% marginal rate)	≈ $2,330	≈ $2,330
Added self-employment tax (roughly 15.3% under IRC § 1402)	—	≈ $1,620
§ 6662 accuracy penalty (20% of the underpayment, if asserted)	≈ $470	≈ $790
Interest, ~2 years at the IRS rate (illustrative)	≈ $400	≈ $700
Rough exposure	≈ $3,200	≈ $5,400

Two things jump out. Rental income is generally not subject to self-employment tax, so the same disallowance costs a Schedule C filer thousands more—if that is you, the fight is worth proportionally more. And either way, the real bill is a multiple of what "the tax on the deduction" sounds like. Understanding Your IRS Balance shows how these pieces stack on your account.

One more Schedule E wrinkle: if the disputed deduction only deepens a rental loss the passive-activity rules were already suspending, winning may adjust your loss carryforward rather than this year's bill. Check How To Deduct Rental and Passive-Activity Losses before you price the fight.

The 20% accuracy penalty. IRC § 6662(a) adds 20% of the underpayment for negligence or for a substantial understatement (an understatement exceeding the greater of 10% of the tax required to be shown or $5,000). The reasonable-cause defense under § 6664(c) is genuinely plausible here, because characterization is technical and fact-bound: reasonable people applying the BAR tests to the same invoice disagree. The penalty playbook is in How To Fight the IRS Accuracy-Related Penalty, and the supervisory-approval check that can kill a penalty outright is in Supervisory Approval Penalty Disputes in Tax Court. Keep it in perspective: a repair-versus-improvement recharacterization is a disagreement about timing and characterization, not an accusation of dishonesty—and if you are still in exam, asking the examiner in writing not to assert the penalty is cheaper than fighting it later.

Interest. Interest under § 6601 runs from the return's original due date at the § 6621 underpayment rate, and it keeps accruing while you are in Appeals and in Tax Court. It is generally not abatable outside the narrow situations in § 6404. One lever exists: a deposit in the nature of a cash bond under IRC § 6603 stops interest on the deposited amount without conceding anything or giving up your right to litigate. See How Interest Works on Your IRS Tax Debt and IRS Interest Abatement Under Section 6404.

Verify the IRS's numbers. This adjustment comes out of an examination, so it lives on Form 4549 and Form 886-A—not a CP2000 (if what you actually received is a CP2000, start with How To Respond to a CP2000 Notice). You can pull your own account transcript and tax return transcript through IRS.gov Get Transcript to confirm what was actually assessed; a practitioner with a power of attorney can also pull PINEX, the IRS's penalty-and-interest computation transcript. Check three things: (a) the depreciation offset was allowed; (b) the penalty was computed only on the portion of the underpayment attributable to this adjustment; and (c) interest starts from the correct due date. See How To Get and Read Your IRS Transcripts and How To Read IRS Transcript Codes.

Your Procedural Options

If you are still in the examination, respond to the exam report with your invoice breakouts and reg citations—see How To Respond to an IRS Audit. One caution: the exam package includes Form 870, a waiver of restrictions on assessment. Signing it closes the case as agreed and gives up the Notice of Deficiency—and with it your path to Tax Court. Do not sign it if you intend to contest. Expect the examiner to check the same pattern in your other open years; Understanding IRS Statutes of Limitations explains which years those are.

If you receive a 30-day letter, you have 30 days to request an IRS Appeals conference, where the reg examples give the Appeals officer a principled way to split the invoices—see What To Expect at Your IRS Appeals Conference. If the 30 days lapse or Appeals does not resolve it, the Notice of Deficiency follows.

If the Notice of Deficiency has already arrived, the clock is running: you have 90 days from its date (150 days if the notice is addressed to you outside the United States) to file a Tax Court petition, and that deadline cannot be extended. Start with the 90-day letter explainer and How To File Your Tax Court Petition. The filing fee is $60, and if your disputed amount is $50,000 or less per year, you can elect the informal small-case procedures—see Small Case or Regular Case.

Filing on time also means you do not have to pay first: a timely petition bars the IRS from assessing or collecting the disputed amount while your case is pending—see How IRC § 6213 Protects You While Your Tax Court Case Is Pending. And if the deadline has already passed, the petition door is closed, but audit reconsideration and the other routes in You Missed the 90-Day Deadline—Now What? are not.

Most (76%) of Tax Court cases close by formal settlement, and a repair-vs-improvement dispute is a classic split-the-invoices settlement: the clearly capital items get conceded, the clearly repair items get allowed, and the middle gets negotiated—at Appeals or with IRS Chief Counsel. See How To Settle Your Tax Court Case. The stronger your item-by-item documentation, the better your split. A docketed case typically takes 6-18 months to resolve, and interest runs the whole way—another reason the § 6603 deposit above is worth a look.

What To Do Now

Calendar the deadline. If you have a Notice of Deficiency, your 90 days run from the date on the notice and cannot be extended.
Read the Form 4549 and 886-A line by line. List every recharacterized item and the reason given. Check whether the depreciation offset was allowed.
Map each item to its unit of property. Building structure, or which of the nine building systems? That sets the yardstick.
Run each item through the BAR tests. What fraction of the system or structure did the work replace? Apply the comparison rule and match your facts against Examples 13, 14, and 25.
Rebuild the paper. Itemized invoices (get lump sums broken out), before-and-after photos, the triggering event, maintenance history, and your books' expensing policy.
Check the safe harbors, honestly. Election statements on the audit-year return? Look at the complete copy of the return as filed—your preparer's copy or your e-file PDF—because attached statements do not appear on IRS transcripts. If there are none, the safe harbors are likely off the table for that year: lead with the merits, and attach the statements going forward.
Pull your transcripts and verify the assessment, penalty base, and interest start date.
Pick your forum—exam response, Appeals conference, or Tax Court petition—and work the settlement math item by item.

Get Help

Around 89% of Tax Court petitioners represent themselves, and a repair dispute—a documents-and-regulations fight—is among the more manageable ones to handle pro se. If your income is at or below 250% of the poverty line and your dispute is $50,000 or less per tax year, a Low Income Taxpayer Clinic may represent you for free. Above those limits, When To Get Professional Help With Your Tax Dispute walks through when paying for an hour of advice makes sense—a defective election or a lump-sum invoice that needs unbundling is exactly that spot.

Resources

Regulations (eCFR):

Statutes:

IRS guidance:

Tangible Property Final Regulations FAQ — the IRS's own plain-language walkthrough
Notice 2015-82 — the $2,500 non-AFS de minimis threshold
Publication 527 — Residential Rental Property (PDF—Table 1-1 is in the PDF)
IRS Get Transcript

Companion articles on TaxCourtHelp:

This article is for informational purposes only and does not constitute legal or tax advice. For advice specific to your situation, consult a qualified tax professional or attorney.