Tax prep fees
The portion of personal tax preparation fees attributable to Schedule C, Schedule SE, and other business-related schedules is deductible on Schedule C as a business expense. The portion attributable to Form 1040, Schedule A, and personal credits is not deductible (the miscellaneous itemized deduction for tax prep was eliminated in 2018-2025).
Legal fees
Legal fees for business contracts, employment matters, intellectual property, defense of business lawsuits, collection of business debts, and other ordinary business legal work are fully deductible. Legal fees for personal matters (divorce, estate planning, personal injury) are generally not deductible.
Capital legal fees
Legal fees connected to the acquisition of a capital asset must be capitalized as part of the asset's basis (e.g., legal fees to buy commercial real estate are added to the building's basis and depreciated over 39 years). The rule is fact-specific — origin-of-the-claim doctrine controls.
Accounting and bookkeeping
Monthly bookkeeper fees, periodic accounting reviews, payroll service fees, and CFO advisory engagements are all deductible as ordinary business expenses. Annual audit fees for a small business voluntarily seeking audited financials are deductible.
Where it goes
Schedule C line 17 ("Legal and professional services") is the dedicated line. Be consistent year over year so trends are visible.
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.