Ordinary & Necessary and Reasonable Business Deductions

What makes a business expense deductible: ordinary, necessary, and reasonable? This lecture explains the three IRS criteria every business deduction must meet, what each term actually means, and how the reasonable test applies to related-party transactions — a foundational REG CPA exam taxation topic and a core part of income tax and college accounting courses. If you are searching for the difference between an ordinary and a necessary expense or why the IRS scrutinizes related-party costs, this session breaks it down with an example. Try it free at farhatlectures.com — interactive exercises, lectures, simulations, cases, multiple choice, and AI tools for CPA, CMA, EA and students. Video Timeline & Key Concepts: 0:00 — Introduction and the three deduction criteria 2:05 — Ordinary: common and customary in the trade 3:53 — Necessary: helpful and appropriate 5:27 — Reasonable: not excessive and related-party concerns 8:53 — Practical example: the AICPA conference trip Frequently Asked Questions: What three criteria must a business expense meet to be deductible? To be deductible, a business expense must be ordinary, necessary, and reasonable. If it fails any one of these three tests, the deduction can be disallowed by the IRS. What does ordinary mean for a business deduction? An ordinary expense is one that is common, accepted, and customary in your specific trade or industry. It does not have to occur frequently, but it must be the kind of cost that similar businesses would normally incur. What does necessary mean for a deduction? A necessary expense is one that is helpful and appropriate for the business. It need not be absolutely critical to operations, only something a prudent business person would reasonably choose to spend money on, such as advertising or professional software. What makes an expense reasonable? An expense is reasonable when its cost is not excessive and aligns with what a disinterested third party would pay for the same goods or service. This test is especially important for related-party transactions, which the IRS examines closely. Why does the IRS scrutinize related-party transactions? Related-party transactions, such as paying rent to yourself or a relative, create a risk of inflated deductions. The IRS reviews them to ensure the amount reflects fair market value rather than an artificially high, unreasonable cost. #CPAexam #CMAexam #enrolledagentexam #accountingcourses #collegecourses #courses #REG #taxation #businessdeductions #incometax #ProfessorFarhat #accountingstudents