Small Business Tax Deductions Guide

The IRS allows deductions for expenses that are both ordinary and necessary for your trade or business. Ordinary means the expense is common and accepted in your industry. Necessary means it is helpful and appropriate, though it does not need to be indispensable. The expense must have a clear business purpose and be properly documented.

Personal expenses are never deductible, even if they indirectly benefit your business. When an expense has both personal and business components (like a cell phone used for both), you can deduct the business-use percentage. The IRS expects you to make a reasonable allocation and maintain records supporting it.

Deductions are reported on Schedule C for sole proprietors and single-member LLCs. Partnerships, S-Corps, and C-Corps have different filing requirements but the underlying rules for what qualifies as a deductible expense are largely the same.

The home office deduction is available if you use a portion of your home regularly and exclusively for business. You do not need a separate room—a dedicated corner of a room qualifies—but the space cannot double as a guest bedroom or playroom. The simplified method provides $5 per square foot up to 300 square feet ($1,500 maximum). The regular method deducts the actual business-use percentage of mortgage interest or rent, utilities, insurance, repairs, and depreciation.

If you rent a separate office, coworking membership, or dedicated workspace, the full cost is deductible as a rent expense. This includes utilities and services associated with the space. Even parking fees at your workspace are deductible.

For equipment, Section 179 allows you to deduct the full purchase price of qualifying business equipment in the year you buy it rather than depreciating it over several years. This includes computers, furniture, machinery, and software. For 2024, the Section 179 deduction limit is $1,220,000.

For business vehicle use, you can deduct using either the standard mileage rate or actual expenses. The standard mileage rate for 2024 is 67 cents per mile. The actual expense method deducts gas, insurance, repairs, depreciation, and other vehicle costs based on the business-use percentage. You must track mileage regardless of which method you choose.

Business travel expenses are deductible when you travel away from your tax home for business purposes. This includes airfare, lodging, meals (50% deductible), ground transportation, tips, and incidental expenses. Keep detailed records including dates, destinations, business purpose, and receipts for expenses over $75.

Commuting from home to your regular workplace is never deductible. However, travel from your home office to a client site, or from one business location to another, qualifies as business mileage. If your home is your principal place of business, trips from home to any business destination are deductible.

Fees paid to accountants, attorneys, consultants, and other professionals for business purposes are fully deductible. This includes tax preparation fees for your business return (Schedule C), legal fees for contracts and business formation, and consulting fees for business strategy.

Professional development expenses are deductible when they maintain or improve skills required in your current trade or business. Courses, workshops, conferences, books, and subscriptions related to your field qualify. However, education that qualifies you for a new trade or business is not deductible as a business expense.

Professional memberships, licenses, and certifications required for your work are deductible. This includes bar dues for attorneys, medical licenses for healthcare professionals, and membership fees for industry associations. Union dues are also deductible as a business expense for self-employed individuals.

Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and dependents on Form 1040 (not Schedule C). This includes medical, dental, and vision insurance, as well as qualified long-term care insurance. The deduction is limited to your net self-employment income and is not available for months when you were eligible for an employer-sponsored plan.

Contributions to tax-deferred retirement accounts—SEP IRA, Solo 401(k), or SIMPLE IRA—are deductible and reduce your income tax. For 2024, SEP IRA contributions can be up to 25% of net self-employment income (maximum $69,000). Solo 401(k) limits are $23,000 employee deferral plus up to 25% of net income as employer contribution.

Health Savings Account (HSA) contributions are also deductible if you have a qualifying high-deductible health plan. For 2024, the limit is $4,150 for individuals and $8,300 for families, with an additional $1,000 catch-up contribution for those 55 and older. HSA funds grow tax-free and can be used for qualified medical expenses tax-free.

Business insurance premiums are fully deductible, including general liability, professional liability (errors and omissions), business property insurance, and cyber liability insurance. If you have a business auto policy, the business-use portion is deductible.

Bank fees, credit card processing fees, and merchant service fees are deductible business expenses. So are accounting software subscriptions, project management tools, and other SaaS products used for business. Software used for both personal and business purposes should be allocated proportionally.

Bad debts are deductible if you use the accrual method and have previously included the amount in income. If a client does not pay an invoice you have already recognized as revenue, you can write off the uncollectible amount. Cash-basis taxpayers generally cannot deduct bad debts because the income was never recorded. Finally, do not forget start-up costs—you can deduct up to $5,000 in the first year your business is active, with the remainder amortized over 15 years.