Two-prong test
Education is deductible if it (a) maintains or improves skills required in your present trade or business OR (b) is required by your employer or by law to keep your present salary, status, or job. Education that qualifies you for a new trade or business is NOT deductible, even if it would advance your career.
CPE for licensed professionals
Required continuing professional education for CPAs, attorneys, doctors, financial advisors, and other licensed professionals is clearly deductible — it maintains the skills required to keep practicing. Course tuition, materials, travel, and exam fees are all included.
Online courses and conferences
Online courses, webinars, conference attendance, professional association dues, and industry trade publications all qualify as long as they relate to your current business. Schedule C line 27 ("Other expenses") with a labeled detail for "Continuing education" is the typical placement.
Examples that fail the test
A bookkeeper getting a CPA license to enter public accounting — the CPA qualifies them for a new trade. An attorney pursuing an MBA to become a consultant — the MBA qualifies for a new field. An employee getting a license required for their current job — qualifying education that does not improve current job skills.
Travel for education
Travel to attend a deductible education event is deductible following the regular travel rules. Pure "travel as education" (e.g., visiting historical sites to "broaden your perspective") is not deductible.
Worked example with numbers
Consider a sole prop with $100,000 in gross receipts and $30,000 in legitimate Schedule C deductions, including this category. Each additional $1,000 of qualifying expense reduces Schedule C net profit by $1,000, which reduces self-employment tax by approximately $1,000 × 92.35% × 15.3% ≈ $141, and reduces income tax by $1,000 × marginal rate. At a 22% federal marginal rate, the combined federal tax savings on each additional $1,000 of legitimate deduction is roughly $361, and state savings sit on top of that. The math is why disciplined categorization throughout the year pays for itself.
Common mistakes that disallow the deduction
The recurring ways this deduction gets disallowed in examination cluster in four categories: (1) personal-use expenses bundled with business (the deduction is disallowed entirely or apportioned downward); (2) inadequate substantiation (no receipt, no invoice, no business-purpose note); (3) the wrong line on Schedule C (not fatal, but it weakens audit defense); and (4) double-counting with another line (for example, deducting an expense on Schedule C and also on Form 8829, or as a personal itemized deduction on Schedule A). The fix in every case is contemporaneous bookkeeping and a clean chart of accounts.