Small business owners can significantly reduce their tax burden by taking advantage of available deductions. In 2026, the IRS continues to allow a wide range of business expenses to be deducted, but proper documentation is essential to survive an audit.
Whether you operate as a sole proprietorship, LLC, S-corporation, or partnership, understanding your deductions can save thousands of dollars annually. This guide covers the most valuable deductions available to small business owners.
Top small business tax deductions
Home office deduction: If you use a portion of your home exclusively for business, you can deduct a percentage of your rent, mortgage interest, utilities, and insurance. The simplified method allows a deduction of $5 per square foot, up to 300 square feet ($1,500 maximum).
Vehicle expenses: You can deduct business-related vehicle costs using the standard mileage rate (67 cents per mile for 2025) or by deducting actual expenses (gas, maintenance, insurance, depreciation). Keep a detailed mileage log.
Qualified Business Income (QBI) deduction: Section 199A allows eligible pass-through businesses to deduct up to 20% of qualified business income. This deduction is available through 2026 and can reduce your effective tax rate significantly.
Retirement contributions: Solo 401(k)s and SEP IRAs allow contributions up to $69,000 for 2025 (plus a $7,500 catch-up if age 50+). These contributions are tax-deductible and reduce your taxable income.
Health insurance premiums: Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and dependents. This is an above-the-line deduction, meaning you do not need to itemize.
Business meals: You can generally deduct 50% of business meal expenses, provided they are ordinary, necessary, and not lavish. Entertainment expenses are no longer deductible.
Startup costs: New businesses can deduct up to $5,000 in startup costs and $5,000 in organizational costs in the first year of operation.
Record keeping best practices
- Keep receipts and invoices for all business expenses.
- Use dedicated business bank accounts and credit cards.
- Track mileage in real-time using a mobile app.
- Reconcile your books monthly, not just at tax time.
- Store digital copies of all tax records for at least 7 years.
Final thoughts
Tax deductions are powerful tools for reducing your business tax liability, but they require disciplined record-keeping. Consider working with a CPA who specializes in small businesses to ensure you capture every deduction while staying compliant with IRS rules.