Taxterity research

Is it an ordinary and necessary business expense? A four-fork fact checklist

Reviewed 2026-09-15 · AI-assisted draft and editing; sources and limitations remain visible for independent review.

Answer: Section 162(a) allows a deduction for the ordinary and necessary expenses paid or incurred during the taxable year in carrying on any trade or business, and Reg. §1.162-1(a) adds that the expenditure must be directly connected with or pertaining to that trade or business. Neither text defines ordinary or necessary, which is why the working question in practice is not whether an expense feels businesslike but which of four forks disposes of it. First, had the trade or business begun, or is the cost a start-up expenditure governed by section 195? Second, is it a personal, living or family expense barred by section 262? Third, is it capital under section 263(a), including an improvement to tangible property? Fourth, does a specific provision disallow it, such as section 162(c), (f) or (g)? That fourth fork has a trap worth stating plainly: Reg. §1.162-1(a) provides that a deduction for an expense paid or incurred after December 30, 1969 that would otherwise be allowable under section 162 is not denied on the ground that allowing it would frustrate a sharply defined public policy. The disallowance has to be traced to a named provision, not to a general policy argument. This checklist collects the facts each fork needs; it does not resolve any of them.

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Scope

Jurisdiction: United States — federal

Tax periods: Not period-specific; checked 2026-09-15, 1.162-21: tax years from 2021-01-19, 263(a)(1)(B) 174A: tax years after 2024

Assumptions

Exclusions

What the two governing texts actually say

Section 162(a) is a single sentence followed by three named inclusions: a reasonable allowance for salaries or other compensation for personal services actually rendered; traveling expenses while away from home in the pursuit of a trade or business, excluding amounts lavish or extravagant under the circumstances; and rentals or other payments required as a condition to the continued use of property in which the taxpayer has no equity. Reg. §1.162-1(a) supplies a longer list of examples, including management expenses, commissions, labor, supplies, incidental repairs, advertising and other selling expenses, insurance premiums against business losses, and rental for the use of business property.

Two sentences in that regulation carry more weight than their placement suggests. One states that the full amount of the allowable deduction is deductible even though the expenses exceed the gross income derived during the taxable year from the business, which forecloses an argument that a loss year is itself disqualifying under section 162. The other bars any item from business expenses to the extent the taxpayer uses it in computing the cost of inventory property or in determining the basis of its plant, equipment or other property. The second sentence is a routing rule, and it is the bridge to the capital fork below.

Fork 1. Had the trade or business begun?

The words in section 162(a) are 'carrying on', and they are doing work. An amount paid while investigating or creating a business, or in an activity engaged in for profit before the active trade or business begins, is a start-up expenditure under section 195(c)(1) and is not deductible under section 162 in the year paid. Reg. §1.263(a)-1(b) makes the same point from the other direction, naming section 195 as a provision that requires capitalization of certain costs.

The facts this fork needs are narrow and specific: the date the entity came into existence, the date operations for which it was organized actually began, what the taxpayer was doing in between, and whether the new activity is in the same field as an existing business the taxpayer already conducts. That last fact matters because section 195(c)(1)(B) tests the cost against what would be deductible in an existing active business in the same field. A sibling page in this library, 'Start-up and organizational costs: the begins-business fork and the deemed election', works through that analysis and the amortization mechanics.

Fork 2. Is the expense personal?

Section 262(a) denies a deduction for personal, living or family expenses except as otherwise expressly provided, and Reg. §1.262-1(b) illustrates the line with examples that answer a surprising share of real questions. Commuting costs between home and a place of business or employment are personal. For expenses paid or incurred on or after October 1, 2014, local lodging is a personal expense unless it qualifies as deductible under section 162, so the fork narrows the question rather than closing it. Household expenses including rent, water, utilities and domestic service are not deductible; but where the taxpayer uses part of the house as a place of business, the portion of rent and similar expenses properly attributable to that place of business is a business expense.

Section 262(b) adds a rule that is easy to overlook in a small-business file: for an individual, any charge for basic local telephone service on the first telephone line to a residence is treated as a personal expense. Record the facts this fork turns on, which are usually the location where the work was done, the presence of a separate business location, and any allocation the taxpayer has actually made, rather than a percentage asserted after the fact.

Fork 3. Is it capital?

Section 263(a)(1) denies a deduction for amounts paid out for new buildings or for permanent improvements or betterments made to increase the value of property, and section 263(a)(2) does the same for amounts expended in restoring property or making good the exhaustion for which an allowance is or has been made. The statute then lists its own exceptions by cross-reference, including development expenditures under section 616, research and experimental expenditures deductible under section 174 or 174A, soil and water conservation under section 175, fertilizer under section 180, barrier removal under section 190, tertiary injectants under section 193, and amounts deducted under sections 179 through 179E. One of those cross-references is new: the words 'or 174A' were inserted into section 263(a)(1)(B) by Public Law 119-21, applicable to amounts paid or incurred in taxable years beginning after December 31, 2024. For earlier years that exception names section 174 alone.

Reg. §1.263(a)-1(d) lists the categories that most often catch a claimed operating expense: amounts paid to acquire or produce tangible property, amounts paid to improve it, amounts paid to acquire or create intangibles, and amounts paid to facilitate an acquisition of a trade or business or a change in capital structure. Reg. §1.263(a)-1(e)(1) adds that commissions and other costs paid to facilitate a sale of property are not currently deductible but reduce the amount realized, with a dealer exception in (e)(2). Where the cost relates to tangible property already in service, the analysis moves to the sibling page 'Business repairs vs. capital improvements: the §1.263(a)-3 decision sequence'.

Fork 4. Does a named provision disallow it?

This is where the checklist earns its keep. Reg. §1.162-1(a) states that a deduction for an expense paid or incurred after December 30, 1969 that would otherwise be allowable under section 162 shall not be denied on the grounds that allowance would frustrate a sharply defined public policy, and directs the reader to section 162(c), (f) and (g). A disallowance argument therefore has to land on a provision, and the file should name which one.

Section 162(c)(1) denies a deduction for a payment to an official or employee of any government that constitutes an illegal bribe or kickback, or that is unlawful under the Foreign Corrupt Practices Act of 1977 where the recipient is an official or employee of a foreign government, and places the burden of proof on the Secretary to the same extent as under section 7454. Section 162(f)(1) denies a deduction for amounts paid to, or at the direction of, a government or governmental entity in relation to the violation of any law or an investigation or inquiry into a potential violation. Section 162(g) denies two-thirds of amounts paid on antitrust treble-damage judgments and related settlements where the taxpayer was convicted or entered a plea of guilty or nolo contendere.

Section 162(f)(2) is the exception that decides most settlement files, and it has three conjunctive requirements: the taxpayer establishes that the amount is restitution, including remediation of property, or is paid to come into compliance with the violated law; the amount is identified as such in the court order or settlement agreement; and, for restitution of an unpaid tax, the amount would have been deductible had the tax been timely paid. The statute adds that identification alone is not enough. Reg. §1.162-21 implements this and carries its own period: under paragraph (g) it applies to taxable years beginning on or after January 19, 2021, except for amounts under an order or agreement that became binding under applicable law before that date. Paragraph (a)(3)(ii) also narrows the trigger, excluding routine audits or inspections of regulated businesses unrelated to evidence of wrongdoing.

The intake sheet

Collect these before writing anything. What the taxpayer bought and from whom, in the vendor's own words rather than the general ledger caption. The date the amount was paid or incurred and the taxpayer's method of accounting. The business activity it relates to, and whether that activity was already operating. Any personal use or personal benefit, and the allocation actually made at the time. Whether the amount attaches to property, inventory, an intangible, or a transaction, which decides the capital fork. Whether a government, a court order or a settlement agreement is involved, and the exact identifying language of that document. Whether any specialized substantiation regime applies to the category.

Then write one line per fork naming the provision relied on and the fact that disposes of it. A memorandum that concludes an expense is ordinary and necessary without recording which of the four forks it cleared is not reviewable, which is the practical test of a workpaper.

What this page does not decide

Whether a given expense is ordinary and necessary remains a fact question that turns on the taxpayer's business, the circumstances, and, in a contested case, on judicial authority this page does not survey. The four forks are exclusionary rather than sufficient: clearing all four means no listed provision disposes of the deduction, not that the deduction is allowable.

For a specific item, ask Taxterity a research question that states the expense, the business and the period, and use Federal Tax Memo when the answer has to become a signed workpaper. Verify each authority it returns against the current statute and regulation yourself before relying on it.

Related research

Official sources

  1. 26 U.S.C. 162 — Trade or business expenses (Office of the Law Revision Counsel) — Section 162(a) and (a)(1)-(3); 162(c)(1); 162(f)(1) and (f)(2)(A); 162(g); prelim edition current through laws in effect September 14, 2026
  2. 26 CFR 1.162-1 — Business expenses (eCFR) — (a) In general: 'directly connected with or pertaining to', the inventory and basis exclusion, the post-December 30, 1969 public-policy sentence, and the excess-of-gross-income sentence
  3. 26 U.S.C. 262 — Personal, living, and family expenses (Office of the Law Revision Counsel) — Section 262(a) general rule and 262(b) first residential telephone line
  4. 26 CFR 1.262-1 — Personal, living, and family expenses (eCFR) — (a) In general; (b)(3) household expenses and business use of part of a residence; (b)(5) commuting and local lodging on or after October 1, 2014
  5. 26 U.S.C. 263 — Capital expenditures (Office of the Law Revision Counsel) — 263(a)(1) and its exceptions (A)-(K), and 263(a)(2); Amendments note 2025 (Pub. L. 119-21 inserted 'or 174A' in (a)(1)(B)) and the Effective Date of 2025 Amendment note
  6. 26 CFR 1.263(a)-1 — Capital expenditures; in general (eCFR) — (b) coordination, naming section 195; (d)(1)-(4) examples of capital expenditures; (e)(1)-(2) amounts paid to sell property
  7. 26 CFR 1.162-21 — Denial of deduction for certain fines, penalties, and other amounts (eCFR) — (a)(1)-(3) including (a)(3)(ii) routine audits; (b)(1)-(2) restitution and identification requirement; (g) applicability date
  8. 26 U.S.C. 195 — Start-up expenditures (Office of the Law Revision Counsel) — Section 195(a) and 195(c)(1)(A)-(B) defining start-up expenditure

Limitations