Small Business Tax Deductions Checklist [2026]

1. Home Office Deduction

If you use part of your home "regularly and exclusively" for business, you can deduct $5 per square foot (up to 300 sq ft = $1,500 max) using the simplified method, or your actual expenses (mortgage interest, utilities, insurance, repairs) using the regular method. The simplified method is easier; the regular method often yields a larger deduction.

Key requirement: The space must be your principal place of business and used only for business — no dual-use spaces. Home office deduction does not apply to W-2 employees who work remotely.

2. Vehicle & Mileage

For 2026, the standard mileage rate is approximately $0.70/mile (final rate announced by IRS in December 2025). Alternatively, you can deduct actual expenses: gas, oil, repairs, tires, insurance, registration, and depreciation. For most business owners, the standard rate is simpler and often more generous.

Two methods: Standard mileage rate ($0.70/mile × business miles) vs. Actual expenses (% of actual costs based on business vs. personal mileage). You must choose standard rate in the first year you use the car for business to use it in future years.

3. Equipment & Software (Section 179)

Section 179 allows you to deduct the full cost of qualifying equipment and software in the year you place it in service, rather than depreciating it over multiple years. For 2026, the Section 179 limit is approximately $1,220,000 (subject to inflation adjustment). Qualifying purchases include:

• Computers, laptops, monitors, and printers
• Office furniture (desks, chairs, shelving)
• Business software and SaaS subscriptions
• Manufacturing equipment and machinery
• Vehicles used for business (subject to limits)

4. Business Meals

Business meals with clients, prospects, or employees are 50% deductible. The meal must be directly related to business activity, and you (or an employee) must be present. Documentation must include: amount, date, location, business purpose, and who was present.

Note:Meals provided to employees for the employer's convenience (e.g., on-site cafeteria) are 100% deductible through 2025 but may revert to 50% in 2026. Check current tax law.

5. Travel & Transportation

Business travel expenses are fully deductible: airfare, hotels, rental cars, Uber/Lyft at your destination, 50% of meals while traveling, conference fees, and dry cleaning. The trip must be primarily for business — personal days must be separated.

Key rule: If the trip is primarily personal, only direct business expenses are deductible. If primarily business and you extend for personal days, transportation is fully deductible (lodging/meals only for business days).

6. Health Insurance Premiums

Self-employed individuals can deduct 100% of health, dental, and long-term care insurance premiums for themselves, their spouse, and dependents. This is an "above-the-line" deduction (reduces AGI, no itemizing needed). Medicare premiums (Parts B and D) are also deductible.

7. Retirement Contributions

Contributions to SEP IRA, Solo 401(k), or SIMPLE IRA are deductible. For 2026:

• SEP IRA: Up to 25% of net earnings, max ~$69,000
• Solo 401(k): Employee contribution (~$23,000) + employer profit share (up to 25%) = total ~$69,000
• SIMPLE IRA: ~$16,500 employee deferral + 3% employer match

Retirement contributions reduce both income tax AND self-employment tax — a double benefit.

8. Professional Services

Fees paid to accountants, lawyers, consultants, bookkeepers, and business coaches are fully deductible. This includes tax preparation fees for your business (but not personal tax prep for W-2 employees).

9. Advertising & Marketing

All advertising and marketing costs are deductible: Google/Facebook ads, website hosting, SEO tools, content creation, business cards, signage, promotional materials, and client entertainment (subject to 50% meal rules).

10. QBI Deduction (20% Pass-Through Deduction)

The Qualified Business Income deduction allows eligible pass-through business owners (sole props, LLCs, S-Corps, partnerships) to deduct up to 20% of their qualified business income. For 2026, the phaseout threshold is approximately $382,500 (married filing jointly) / $191,250 (single). Above these thresholds, specified service businesses (health, law, consulting, financial services) begin to phase out.