Small Business Tax Deductions Checklist: 30+ Write-Offs You Should Know
By BizCalculators Team · Last reviewed September 4, 2026
Small businesses can claim 30+ write-offs, including the home office deduction ($5 per square foot up to 300 sq ft, or $1,500 max), the vehicle mileage rate, and Section 179 full-cost equipment expensing, with each $1,000 deduction saving roughly $210-240 in taxes.
Why Tax Deductions Matter
Business tax deductions reduce your taxable income, which directly lowers your tax bill. Every dollar of legitimate business expense you deduct is a dollar that isn't taxed. For a business in the 21% corporate tax bracket or an individual in the 24% bracket, a $1,000 deduction saves $210-240 in taxes. Keeping good records throughout the year and knowing what's deductible ensures you don't overpay.
A deduction is worth your marginal rate, not a flat percentage, so the same $1,000 expense saves roughly $120 in the 12% bracket and closer to $370 at the top rate — which is why bunching large purchases into a high-income year pays off. Deductions reduce taxable income rather than tax owed, unlike credits. Expenses must also be ordinary and necessary for your trade, and a side venture needs a profit motive or the IRS can treat it as a hobby and disallow the losses.
Home Office Deduction
If you use part of your home exclusively and regularly for business, you can deduct a portion of your rent/mortgage, utilities, insurance, and maintenance. Use the simplified method ($5 per square foot, up to 300 sq ft = $1,500 max) or the regular method (actual expenses based on the percentage of your home used for business). The space must be used exclusively for business — a kitchen table doesn't qualify, but a dedicated home office room does.
The regular method is more work but often worth more: divide your office square footage by your home's total area, then apply that percentage to rent, utilities, and repairs. Two caveats trip people up. Your deduction cannot exceed the gross income the home office generates, though the regular method lets you carry unused amounts forward while the simplified method forfeits them. And the regular method includes home depreciation, which can be recaptured when you sell, so some owners take the smaller simplified figure for cleaner books.
Vehicle and Travel Expenses
Business use of your vehicle is deductible using either the standard mileage rate (varies yearly) or actual expenses (gas, maintenance, insurance, depreciation). Keep a mileage log with dates, destinations, and business purpose. Business travel — flights, hotels, 50% of meals, conference fees — is deductible when the primary purpose is business. Commuting from home to your regular workplace is not deductible, but travel to client sites and between work locations is.
Whichever method you pick, parking and tolls are deductible on top of the standard rate, and that rate already includes gas, insurance, repairs, and depreciation — adding those costs again is a common and costly mistake. For a purchased vehicle, using actual expenses in year one locks you out of the standard rate later, while starting with the standard rate still lets you switch. With actual expenses you must track total miles driven, not just business miles.
Equipment, Supplies, and Technology
Section 179 allows you to deduct the full cost of qualifying equipment and software in the year of purchase (up to annual limits) rather than depreciating over years. This includes computers, furniture, machinery, vehicles, and off-the-shelf software. Ordinary supplies, shipping costs, professional books and publications, and business-related software subscriptions are also fully deductible. Cloud services, website hosting, and domain fees count too.
Two mechanics decide how much you can expense. The de minimis safe harbor lets you deduct individual items costing up to $2,500 per invoice without capitalizing them, which simplifies small purchases. Section 179 is capped at your business taxable income, so a slow year can strand the deduction and push it forward, while bonus depreciation has no profit requirement but phases down over time. Both the dollar limits and the bonus percentage change periodically, so confirm the current-year figures before you buy.
Professional Services and Insurance
Fees paid to accountants, lawyers, consultants, and other professionals for business purposes are fully deductible. Business insurance premiums — general liability, professional liability/E&O, workers' compensation, commercial property, and business interruption insurance — are deductible. Health insurance premiums for self-employed individuals and their families are also deductible as an above-the-line adjustment to income. Retirement plan contributions (SEP IRA, Solo 401k) can provide significant deductions while building your future.
Not every professional bill qualifies. Fees for personal matters, fines and penalties, political contributions, and lobbying are not deductible, and life or disability insurance where you are the beneficiary usually isn't either. The self-employed health insurance deduction only counts in months the business shows a profit and cannot exceed your earned income. Retirement contributions go furthest: a SEP IRA allows roughly a quarter of net self-employment income up to an annually adjusted cap, and a Solo 401k often lets you contribute more at lower income.
Frequently Asked Questions
What are the most common small business tax deductions?
Common deductions include office rent, equipment, software, marketing, insurance, professional fees, travel, 50% of meals, home office, business use of a vehicle, retirement contributions, and startup costs. The key is accurate records — separate business accounts and digitized receipts make claiming them easy.
Can I deduct my home office?
Yes, if you use a space regularly and exclusively for business. You can use the simplified method ($5 per square foot, up to 300 square feet) or actual expenses (a portion of rent, utilities, insurance). Home office deductions also require that the space is your principal place of business.
How much can I deduct for business meals?
Business meals with clients or prospects are 50% deductible if they're ordinary and necessary, you're present, and you keep records of who, when, where, and why. Travel meals while away on business also qualify at 50%. Entertainment (concerts, events without a business discussion) is not deductible.
Can I deduct a vehicle for business use?
Yes. You can take the standard mileage rate (about 70¢ per mile for 2026) or actual expenses (depreciation, gas, insurance, maintenance) proportionally. Choose one method and stick to it — switching later requires IRS approval. A detailed mileage log is required for either method.