Small Business Tax Deductions: A Complete Checklist
Maximize your small business tax deductions with this comprehensive guide. Learn about home office, vehicle, equipment, and other commonly missed write-offs.
Understanding Business Deductions
A tax deduction reduces your taxable income, lowering the amount of tax you owe. For a small business owner in the 24 percent federal tax bracket, every $1,000 in legitimate deductions saves $240 in federal taxes (plus state tax savings). To qualify as a business deduction, an expense must be both ordinary (common and accepted in your industry) and necessary (helpful and appropriate for your business). You do not need to be profitable to claim deductions — business losses can offset other income on your tax return, subject to certain limitations. Keep detailed records and receipts for all business expenses, as the burden of proof falls on the taxpayer.
Home Office Deduction
If you use a dedicated space in your home regularly and exclusively for business, you can deduct a portion of your housing costs. The simplified method allows $5 per square foot up to 300 square feet, for a maximum deduction of $1,500. The regular method calculates the percentage of your home used for business and applies that percentage to actual expenses — mortgage interest or rent, utilities, insurance, repairs, and depreciation. If your home office occupies 200 of 2,000 total square feet (10 percent), you deduct 10 percent of eligible home expenses. The regular method often yields a larger deduction but requires more detailed record-keeping.
Vehicle and Travel Deductions
You can deduct business-related vehicle expenses using the standard mileage rate (67 cents per mile for 2026) or actual expenses (gas, insurance, repairs, depreciation) prorated by business use percentage. Keep a mileage log documenting the date, destination, business purpose, and miles driven for each trip. Commuting from home to your regular workplace is not deductible, but trips from your office to clients, meetings, or secondary work locations qualify. Business travel expenses — airfare, hotel, meals (50 percent deductible), and ground transportation — are deductible when the primary purpose of the trip is business.
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Equipment and Technology
Section 179 allows you to deduct the full purchase price of qualifying equipment and software in the year of purchase rather than depreciating it over several years, up to $1,250,000 for 2026. This includes computers, printers, office furniture, machinery, and business vehicles under 6,000 pounds. Bonus depreciation allows 60 percent first-year depreciation on new equipment in 2026. Software subscriptions, cloud services, and website hosting fees are fully deductible as ordinary business expenses. Even cell phone plans are partially deductible based on business use percentage.
Commonly Missed Deductions
Many small business owners miss these legitimate deductions: business insurance premiums, professional development and education, business-related books and publications, accounting and legal fees, bank and credit card processing fees, advertising and marketing costs, office supplies and postage, business licenses and permits, retirement plan contributions (SEP IRA, Solo 401k), health insurance premiums for self-employed individuals (deductible from gross income, not itemized), and the qualified business income (QBI) deduction of up to 20 percent of net business income for pass-through entities. Review this list annually to ensure you are claiming everything you are entitled to.
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Frequently Asked Questions
Can I deduct startup costs?
Yes. You can deduct up to $5,000 in startup costs and $5,000 in organizational costs in your first year. If your total startup costs exceed $50,000, the $5,000 deduction begins to phase out. Remaining costs are amortized (spread) over 15 years. Startup costs include market research, advertising for the new business, employee training, travel to set up the business, and professional fees for consultants and attorneys.
Do I need to keep receipts for every expense?
The IRS requires you to substantiate business deductions with records. For most expenses, keep the receipt showing the amount, date, vendor, and business purpose. For expenses under $75 (except lodging), a log entry is sufficient without a physical receipt. Digital records are acceptable — use a scanning app to photograph receipts and store them in organized folders by category and year.
Can I deduct meals and entertainment?
Business meals are 50 percent deductible when there is a clear business purpose and business is discussed during or directly before or after the meal. Keep records of who attended, the business relationship, and the topics discussed. Entertainment expenses (sporting events, concerts, golf outings) are generally no longer deductible for businesses after the 2017 Tax Cuts and Jobs Act, with limited exceptions.