25 Small Business Tax Deductions You Should Not Miss

Vehicle and Transportation (Deductions 1-4)

1. Business Vehicle Mileage

If you use your personal vehicle for business purposes, you can deduct the business use portion using either the standard mileage rate or actual expenses. The 2026 IRS standard mileage rate is 70 cents per mile for business use. If you drive 15,000 business miles per year, that is a $10,500 deduction. The actual expense method tracks gas, insurance, maintenance, depreciation, and registration, then applies the business use percentage. Choose whichever method produces the larger deduction. Keep a mileage log (apps like MileIQ work well) documenting the date, destination, business purpose, and miles for each trip.

2. Vehicle Depreciation and Section 179

If you use the actual expense method, you can depreciate your vehicle. Under Section 179, you can deduct up to $12,400 the first year for a passenger car (plus $8,000 bonus depreciation) or the full purchase price for vehicles over 6,000 pounds GVWR (like trucks and SUVs) up to the $1,250,000 Section 179 limit. A $60,000 SUV used 100% for business can be fully deducted in year one. If business use is 80%, you deduct $48,000. This is one of the largest single deductions available to small business owners.

3. Parking and Tolls

Business-related parking fees and highway tolls are deductible in addition to mileage or actual expenses. Airport parking for a business trip, metered parking for client meetings, and toll charges on business routes all qualify. These are often overlooked small deductions that add up over a year. Commuting expenses (home to regular office) are never deductible.

4. Business Travel Expenses

When you travel overnight for business, you can deduct airfare, hotel, rental car, meals (50% of actual cost or per diem rate), dry cleaning, tips, and business-related phone calls. The trip must be primarily for business, but you can add personal days without losing the deduction for the business portion. For example, a 5-day business trip with a 2-day weekend extension: you deduct all 5 business days of hotel and meals plus the full round-trip airfare (since the trip was primarily business). Domestic travel requires more than 50% of the days to be business days to deduct transportation costs.

Office and Workspace (Deductions 5-8)

5. Home Office Deduction

If you use a dedicated space in your home regularly and exclusively for business, you can deduct a proportional share of your rent or mortgage interest, utilities, insurance, repairs, and depreciation. The simplified method deducts $5 per square foot up to 300 square feet ($1,500 maximum). The regular method calculates the actual percentage of your home used for business. A 200-square-foot office in a 2,000-square-foot home is 10% of all home expenses. For a complete breakdown, see our Home Office Deduction Guide.

6. Office Supplies and Equipment

Paper, ink, pens, postage, printer cartridges, and general office supplies are fully deductible. Equipment purchases like computers, printers, desks, and chairs can be deducted under Section 179 (full cost in year of purchase) or depreciated over their useful life. A $2,000 laptop used 100% for business is deductible in full the year you buy it.

7. Rent and Utilities

If you rent commercial office or retail space, the full rent is deductible. Utilities for business premises, including electricity, gas, water, internet, and phone, are fully deductible. If you work from home, only the business-use portion of utilities qualifies through the home office deduction. A dedicated business phone line is 100% deductible even without a home office deduction.

8. Business Insurance

Premiums for general liability, professional liability (E&O), product liability, commercial property, business interruption, cyber liability, and workers' compensation insurance are all deductible. If you are self-employed, you can also deduct 100% of your health insurance premiums (medical, dental, vision) for yourself, your spouse, and dependents as an adjustment to income on Schedule 1 (this is not an itemized deduction and reduces both income tax and AGI).

Professional Services and Marketing (Deductions 9-13)

9. Professional and Legal Fees

Fees paid to attorneys, accountants, bookkeepers, tax preparers, and consultants for business services are deductible. This includes tax preparation fees for your business return (Schedule C or Form 1120-S), legal fees for contracts and business formation, and consulting fees for business advice. Personal legal fees (divorce, estate planning) are not deductible, but the business portion of a mixed-use engagement is.

10. Advertising and Marketing

All advertising and marketing costs are deductible: Google Ads, Facebook Ads, website hosting, domain names, SEO services, business cards, flyers, trade show exhibits, sponsorships, email marketing platforms, CRM software, and social media management tools. Costs to develop and maintain your business website are deductible as advertising expenses. If you pay a web designer $5,000 to build your site, the full amount is deductible in the year of payment.

11. Software and Subscriptions

Business software subscriptions are deductible: accounting software (QuickBooks, Xero), project management (Asana, Monday), communication (Slack, Zoom), design (Adobe Creative Cloud), and any SaaS tool used for business. Annual subscriptions are deducted in the year paid. Multi-year software licenses can be deducted using Section 179 or amortized over three years.

12. Contract Labor and Freelancers

Payments to independent contractors, freelancers, and subcontractors are deductible business expenses. If you hire a virtual assistant, web developer, graphic designer, or any other non-employee worker, the full payment is deductible. You must issue Form 1099-NEC to any U.S. contractor paid $600 or more in a calendar year. Failure to file 1099s can result in penalties and loss of the deduction.

13. Education and Training

Courses, workshops, conferences, books, and training materials that maintain or improve skills required in your current business are deductible. This includes industry conferences, online courses, professional certifications, trade publications, and business books. Education that qualifies you for a new profession is not deductible (it is considered a personal expense). A freelance web developer taking an advanced React course: deductible. That same developer taking a law school course: not deductible.

Equipment and Assets (Deductions 14-17)

14. Section 179 Expensing

Section 179 allows you to deduct the full purchase price of qualifying business equipment in the year of purchase, rather than depreciating it over several years. The 2026 limit is $1,250,000, with a phase-out beginning at $3,130,000 in total equipment purchases. Qualifying property includes machinery, computers, office furniture, vehicles (with limitations), and certain improvements to nonresidential real property (roofs, HVAC, fire protection, alarm systems). This is a powerful deduction for businesses making capital investments. Use our Self-Employment Tax Calculator to see how equipment deductions affect your total tax.

15. Bonus Depreciation

Bonus depreciation allows you to deduct a large percentage of qualifying asset costs in the first year. Under current law, the bonus depreciation percentage has been phasing down: 80% for 2023, 60% for 2024, 40% for 2025, and 20% for 2026. Unlike Section 179, bonus depreciation can create a net operating loss. For 2026, a $100,000 equipment purchase qualifies for $20,000 in first-year bonus depreciation plus regular depreciation on the remaining $80,000. Section 179 is generally more favorable when the full amount can be deducted.

16. Business Startup Costs

You can deduct up to $5,000 in startup costs and $5,000 in organizational costs in the first year of business. These deductions phase out dollar-for-dollar when total costs exceed $50,000. Startup costs include market research, advertising before opening, travel to scout locations, employee training before opening, and professional fees for setting up the business. Costs exceeding the first-year deduction are amortized over 180 months (15 years).

17. Cell Phone and Internet

The business-use percentage of your cell phone bill and home internet is deductible. If you use your phone 70% for business, deduct 70% of the monthly bill. A separate business phone line is 100% deductible. Business internet at a commercial location is 100% deductible. Keep records of business versus personal use to substantiate the percentage if audited.

Retirement and Benefits (Deductions 18-21)

18. Retirement Plan Contributions (SEP IRA, Solo 401k, SIMPLE IRA)

Self-employed individuals can contribute to retirement accounts with much higher limits than employee plans. A SEP IRA allows up to 25% of net self-employment income (maximum $70,000 for 2026). A Solo 401(k) allows $23,500 as an employee contribution plus 25% of net SE income as an employer contribution, up to $70,000 combined ($77,500 with catch-up for 50+). A SIMPLE IRA allows $16,500 employee plus 3% employer match. These contributions reduce both income tax and self-employment tax (the employer portion). See our Self-Employment Tax Guide for details.

19. S-Corp Salary Optimization

If your business is structured as an S-corporation, you must pay yourself a "reasonable salary" subject to payroll taxes (Social Security and Medicare). However, profits above your salary are distributed as dividends not subject to the 15.3% self-employment tax. If your S-corp earns $200,000 and you pay yourself a $90,000 salary, you save approximately $16,830 in self-employment tax on the $110,000 distribution (compared to if you earned it all as self-employment income). The IRS requires the salary to be reasonable for your industry and role, so setting it too low triggers audit risk. Use our Income Tax Calculator and Self-Employment Tax Calculator to model the savings.

20. Qualified Business Income (QBI) Deduction

The Section 199A QBI deduction allows eligible self-employed individuals and pass-through business owners to deduct up to 20% of their qualified business income. For a sole proprietor with $100,000 in net business income, the QBI deduction could be $20,000, reducing taxable income to $80,000. The deduction phases out for specified service businesses (law, medicine, consulting, accounting) when taxable income exceeds $191,950 (single) or $383,900 (joint) for 2026. For non-service businesses, the deduction is limited by W-2 wages paid and/or the unadjusted basis of qualified property when income exceeds those thresholds. The QBI deduction is scheduled to sunset after 2025 unless Congress extends it.

21. Employee Benefits and Payroll

If you have employees, wages, salaries, bonuses, and commissions are deductible. Employer-paid benefits including health insurance contributions, retirement plan contributions, education assistance (up to $5,250 per employee), dependent care assistance, and group term life insurance (up to $50,000 per employee) are deductible. Employer payroll taxes (Social Security, Medicare, federal and state unemployment) are also deductible. Fringe benefits are a tax-efficient way to compensate employees because they are deductible to the business and often tax-free to the employee.

Financial and Miscellaneous (Deductions 22-25)

22. Business Interest Expense

Interest on business loans, lines of credit, and business credit cards is deductible. This includes SBA loans, equipment financing, commercial mortgages, and inventory financing. Interest on personal credit cards used for business purchases is deductible to the extent of the business charges. The Section 163(j) limitation caps the business interest deduction at 30% of adjusted taxable income for businesses with average annual gross receipts over $30 million, but this threshold rarely affects small businesses.

23. Bad Debts

If you use the accrual method of accounting and a customer fails to pay an invoice, you can deduct the unpaid amount as a bad debt. You must have previously included the income on your tax return and taken reasonable steps to collect the debt. Cash-basis businesses cannot deduct bad debts because the income was never reported (you only report income when received). Bad debt deductions are reported on Schedule C (line 27b) and must be specific, identifiable debts, not general reserves.

24. Business Meals

Business meals are 50% deductible when you discuss business with a client, customer, employee, or business partner. The meal cannot be lavish or extravagant. You must document the date, location, amount, business purpose, and names of attendees. Employee meals provided for the employer's convenience (like meals during overtime) are also 50% deductible. Note that the temporary 100% deduction for restaurant meals (2021-2022) has expired and the rate has returned to 50%. Entertainment expenses (sporting events, concerts, golf outings) remain nondeductible.

25. State and Local Business Taxes

State income taxes on business income, state franchise taxes, city business taxes, sales tax collected and remitted, property tax on business real estate and equipment, and business license fees are all deductible on your federal return. If your state has a pass-through entity tax (PTE tax) election, the business can pay state income tax at the entity level, bypassing the $10,000 individual SALT deduction cap. This strategy can save significant taxes for owners in high-tax states. See our Sales Tax by State guide and Property Tax Calculator for state-specific details.

Summary: Deductions Quick Reference

Use our Income Tax Calculator to model the impact of these deductions on your total tax bill. For self-employment tax specifically, our Self-Employment Tax Calculator shows how deductions reduce both income tax and the 15.3% SE tax. If you pay estimated taxes quarterly, our guide on Quarterly Estimated Taxes covers deadlines and calculation methods. Also read our Tax Deductions Guide for personal deductions that complement your business deductions.

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