IRS documents describe business deductions as ordinary and necessary expenses paid or incurred while carrying on a trade or business. “Ordinary” is described as common and accepted in the relevant industry, and “necessary” is described as helpful and appropriate for the business activity.
What IRS Documents Describe
IRS publications and form instructions explain that deductible business expenses must meet both the ordinary and necessary standard. These rules are discussed primarily in the Instructions for Schedule C (Form 1040) and in IRS Publication 334, Tax Guide for Small Business.
IRS documents also explain that personal, living, and family expenses are not deductible as business expenses. Capital expenses, such as many equipment purchases, are generally not deducted all at once; instead, IRS guidance describes recovering these costs over time through depreciation or amortization, depending on the type of property and circumstances.
The Schedule C Instructions list categories of expenses that may be deductible when they meet IRS requirements. These categories include, among others, advertising, car and truck expenses, commissions and fees, contract labor, depreciation, employee benefit programs, insurance, interest, legal and professional services, office expenses, rent, repairs and maintenance, supplies, taxes and licenses, travel, utilities, wages, and certain business meals.
IRS guidance also describes special rules for specific expense types. These include home office expenses, cost of goods sold, health insurance for self-employed individuals, and expensing or depreciating qualifying property. IRS documents direct readers to additional publications and forms for these topics, depending on the nature of the expense.
IRS materials emphasize that proper classification, recordkeeping, and documentation are important considerations when determining whether an expense meets the requirements described in IRS guidance.
Where to Find Details
IRS documents that explain business deductions include:
- Instructions for Schedule C (Form 1040)
- IRS Publication 334, Tax Guide for Small Business
- IRS Publication 535, Business Expenses
- IRS Publication 946, How To Depreciate Property
- Form 4562, Depreciation and Amortization
- Form 8829, Expenses for Business Use of Your Home
Related IRS Explanations
Disclaimer
“This information is based on official IRS publications and is provided for educational purposes only. It is not tax or legal advice. Tax situations vary, and individuals should consult the IRS or a qualified tax professional for guidance specific to their circumstances.”