2026 Small Business Tax Deductions: 7 Often Missed

Why Missed Deductions Cost You

This guide covers federal tax year 2026. Eligible business deductions can reduce taxable income, but the effect on income and self-employment tax depends on the type of deduction and your situation. Keep records and confirm eligibility before claiming an expense; rates and limits change by year.

1. Home Office Deduction

If you use a portion of your home exclusively and regularly for business, you can deduct it. The simplified method allows $5 per square foot up to 300 square feet. The actual expense method lets you deduct a proportionate share of rent or mortgage interest, utilities, insurance, and repairs. Many small business owners skip this deduction out of fear of audit — but it is entirely legitimate when the space is used exclusively for business.

Sources: IRS: Home office deduction

2. Vehicle and Mileage

For eligible business driving in 2026, the optional standard mileage rate is 72.5 cents per mile. An actual-expense method may be available instead, subject to IRS rules on choosing and switching methods; you cannot deduct both methods for the same miles. Keep a contemporaneous mileage log and records of your business use.

Sources: IRS: 2026 standard mileage rates

3. Health Insurance Premiums

Self-employed individuals can deduct 100% of health insurance premiums paid for themselves, a spouse, and dependents — as an above-the-line deduction on Schedule 1. This deduction is available even if you don't itemize, making it one of the most valuable for solo business owners.

Sources: IRS: Business expenses

4. Retirement Contributions

Eligible contributions to a SEP-IRA, SIMPLE IRA, or one-participant 401(k) may be deductible, subject to plan and tax rules. For 2026, SEP contributions are generally limited to the lesser of 25% of compensation or $72,000; for self-employed individuals, the calculation uses adjusted net earnings and effectively limits the contribution to 20% of those earnings. Check the applicable limits and deadlines for your plan.

Sources: IRS: 2026 SEP contribution limit · IRS: SEP contribution calculations

5. Professional Development and Software

Online courses, books, professional certifications, industry conferences, and subscriptions to trade publications directly related to your business are deductible. So are business software subscriptions — accounting software, project management tools, design platforms, and similar tools used for your business.

Sources: IRS: Business expenses

6. Business Meals

Business meals with clients or colleagues where business is discussed are 50% deductible. Keep records of who attended, what was discussed, and the business purpose. Note that entertainment expenses (sporting events, concerts) are generally no longer deductible under current tax law — only the food and beverage portion qualifies.

Sources: IRS: Business expenses

7. Section 179 and Bonus Depreciation

Eligible property placed in service in a tax year beginning in 2026 may qualify for a Section 179 deduction of up to $2,560,000, reduced dollar-for-dollar when the cost of qualifying property exceeds $4,090,000 and subject to the taxable-income limit. Some property may instead qualify for bonus depreciation under different rules. Vehicle limits and acquisition dates can also matter, so check the current IRS guidance before claiming immediate expensing.

Sources: IRS: Publication 946, How to Depreciate Property