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Tax answers · IRC §162

Which Business Expenses Can You Deduct?

THE TAX CUTTERY® · From the practice of Paul D. Diaz, EA, MBA
Updated September 26, 2026 · Federal tax overview

A business expense generally must be ordinary and necessary for carrying on your trade or business. Personal spending does not become deductible because you paid with a business card. Some costs must be capitalized or treated under another rule rather than deducted immediately.

Connect The Expense To The Work

Keep evidence of what you purchased, what it cost, and why it served the business. Common and accepted costs can differ across industries. An invoice alone may show payment without explaining the business purpose.

Separate Personal Use And Long-Term Assets

For a mixed-use item, identify the business portion with a reasonable, supportable method. Equipment, improvements, inventory, and startup costs may follow rules different from everyday operating expenses. The label in your bookkeeping software does not settle the tax treatment.

A Deduction Is Not A Reimbursement

Spending money solely to obtain a deduction still costs money. Consider whether the purchase serves the business, how much cash it uses, and when the applicable tax rules allow the expense. Review unusual purchases before year-end rather than relying on a generic list of write-offs.

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Source And Scope

IRS Publication 334 — Tax Guide for Small Business. Use the rules and instructions for the tax year involved. This overview does not cover every exception and is general information, not a conclusion about a particular return.

Continue in the Guide: Chapter 3, Chapter 1, Chapter 7, Chapter 10, Chapter 12, Chapter 18, Chapter 21.

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