15 Small Business Tax Deductions You Are Probably Missing

Tax season often feels like writing a large check to the government, but many small business owners pay more than they need to because they miss legitimate deductions. The IRS tax code is complex, and it is easy to overlook deductions that could save you hundreds or even thousands of dollars. Here are 15 commonly missed deductions that every small business owner should know about.

1. Home Office Deduction

If you use a dedicated space in your home exclusively and regularly for business, you can deduct a portion of your rent or mortgage interest, utilities, insurance, and maintenance. The simplified method allows you to deduct $5 per square foot of your home office, up to 300 square feet, for a maximum deduction of $1,500. The actual expense method often yields a larger deduction but requires tracking all household expenses and calculating the business-use percentage.

2. Vehicle Expenses

If you use your personal vehicle for business purposes, you can deduct either actual expenses (gas, maintenance, insurance, depreciation) or the IRS standard mileage rate. For 2026, the standard mileage rate is 67 cents per mile for business use. If you drive 15,000 business miles per year, that is a $10,050 deduction. Keep a mileage log or use an app like MileIQ to track every business trip.

3. Retirement Plan Contributions

Self-employed individuals can contribute to a SEP-IRA, SOLO 401(k), or SIMPLE IRA and deduct those contributions. A SEP-IRA allows you to contribute up to 25% of your net self-employment income, with a maximum of $69,000 for 2026. A SOLO 401(k) allows both employee deferrals (up to $23,000, or $30,500 if you are 50 or older) plus employer contributions of up to 25% of compensation. These contributions reduce your taxable income dollar for dollar.

4. Health Insurance Premiums

Self-employed individuals who are not eligible for employer-sponsored coverage through a spouse can deduct 100% of their health insurance premiums, including dental and long-term care premiums. This deduction is taken on the front of your 1040, meaning it reduces your adjusted gross income. It can also include premiums paid for your spouse and dependents.

5. Qualified Business Income (QBI) Deduction

The Section 199A deduction allows eligible pass-through business owners (sole proprietors, partnerships, S-Corps, LLCs) to deduct up to 20% of their qualified business income. For 2026, the deduction begins to phase out for taxable incomes above $191,950 for single filers and $383,900 for married filing jointly. Below those thresholds, most service businesses qualify for the full 20% deduction.

6. Business Insurance Premiums

All premiums paid for business insurance are deductible. This includes general liability insurance, professional liability (errors and omissions), commercial property insurance, business interruption insurance, cyber liability coverage, and workers compensation. Many business owners carry these policies but forget to categorize them as deductions.

7. Professional Development and Education

Expenses for continuing education, professional development courses, industry conferences, professional certifications, books, subscriptions, and online learning platforms are deductible as long as they maintain or improve skills required in your current business. This includes webinar fees, course registration, travel to conferences, and even professional exam fees.

8. Software and Technology Subscriptions

The monthly and annual subscriptions you pay for business software are fully deductible. This includes your accounting software (QuickBooks, Xero), project management tools (Asana, Monday), CRM systems (Salesforce, HubSpot), design software (Adobe Creative Suite), and cloud storage (Google Workspace, Microsoft 365). Many business owners forget to add up these recurring charges, which can easily total $3,000 to $10,000 per year.

9. Business Meals

Business meals remain 50% deductible when you dine with a client, prospect, or business associate and discuss business during or directly before or after the meal. Keep detailed records including the date, amount, names of attendees, business purpose, and the name and location of the restaurant. The meal must not be lavish or extravagant.

10. Bank Fees and Interest

All fees associated with your business bank accounts and credit cards are deductible. This includes monthly maintenance fees, wire transfer fees, overdraft charges, merchant processing fees (credit card transaction fees), and interest on business loans or business credit cards. If you process payments through Stripe, Square, or PayPal, the processing fees are deductible business expenses.

11. Marketing and Advertising

Every dollar you spend on marketing your business is deductible. This includes website hosting and domain registration, social media advertising (Facebook, Google, LinkedIn), print materials (business cards, brochures, signage), email marketing platforms (Mailchimp, Constant Contact), SEO services, and PR costs. Many solopreneurs underestimate how much they spend on marketing across multiple platforms.

12. Depreciation and Section 179

When you purchase equipment, furniture, or other business assets, you can often deduct the full cost in the year of purchase under Section 179. For 2026, the Section 179 deduction limit is $1,220,000 for qualifying equipment. This includes computers, office furniture, machinery, and even certain vehicles over 6,000 pounds GVWR. Bonus depreciation remains available at 40% for 2026 (it continues to phase down from the 100% level).

13. Startup Costs

If you launched a new business, you can deduct up to $5,000 in startup costs and $5,000 in organizational costs in your first year. These thresholds begin to phase out when total costs exceed $50,000. Startup costs include market research, advertising to launch the business, employee training before opening, travel to establish suppliers, and professional fees for setting up the business entity.

14. Charitable Contributions (C-Corps)

C-Corporations can deduct charitable contributions up to 10% of taxable income. For pass-through entities like S-Corps and LLCs, charitable deductions pass through to the individual owners and are claimed on personal returns. Donating inventory, equipment, or services to qualified nonprofits can also generate deductions, though the rules for non-cash donations are complex.

15. State and Local Tax Deductions

Business-level state and local taxes are fully deductible against your federal income. This includes state income taxes paid by C-Corps, gross receipts taxes, property taxes on business assets, and sales tax on business purchases. Additionally, several states now offer a pass-through entity tax (PTET) election that allows S-Corp and LLC owners to effectively deduct state income taxes at the entity level, bypassing the $10,000 SALT cap on individual returns.

Maximizing Your Deductions

The key to capturing all legitimate deductions is maintaining organized records throughout the year. Use accounting software to categorize expenses in real time. Keep receipts and documentation for every deduction. Meet with your CPA for year-end tax planning in October or November rather than waiting until tax season. Proactive planning almost always results in lower taxes than reactive preparation.