Top Tax Deductions for Small Business Owners

Most small business owners leave money on the table every April, not because the deductions do not exist, but because they do not know which ones apply, how to document them, or when to claim them. The difference between a generic tax return and a CPA-prepared return often comes down to the deductions your preparer knows to look for. Here are the deductions that consistently deliver the most value.

The QBI Deduction (Section 199A)

The Qualified Business Income deduction lets many sole proprietors, partnerships, and S corporations deduct up to 20% of qualified business income. It is one of the largest deductions available, but it is subject to income thresholds and limitations based on your entity type, industry, and W-2 wages paid. Proper Tax Planning ensures you structure your business to maximize QBI rather than lose it to a phase-out.

Home Office Deduction

If you use a portion of your home regularly and exclusively for business, you can deduct a percentage of rent, utilities, insurance, and depreciation proportional to that space. The simplified method ($5 per square foot, up to 300 sq ft) is easy, but the actual expense method often yields a larger deduction for businesses with significant home costs.

Vehicle and Mileage

Business driving is deductible either at the IRS standard mileage rate or as actual vehicle expenses (depreciation, gas, maintenance, insurance). The right method depends on your vehicle and usage pattern. A contemporaneous mileage log is essential, reconstructing mileage at year-end is where most audits begin.

Section 179 and Bonus Depreciation

Equipment, furniture, and software purchased for the business can be expensed immediately under Section 179 (up to annual limits) or bonus depreciation, rather than depreciated over years. This front-loads the deduction and can significantly reduce current-year tax liability.

Retirement Contributions

Contributions to a SEP-IRA, Solo 401(k), or defined benefit plan are deductible and reduce both income tax and, depending on the plan, self-employment tax. For high-earning business owners, retirement contributions are one of the most powerful tax reduction tools available.

Health Insurance, Meals, and Travel

Self-employed health insurance premiums are deductible above the line. Business meals (50% deductible) and travel (100% deductible when primarily for business) add up, but only when properly documented with purpose, attendees, and business context.

Document Everything

Every deduction on this list requires documentation. Our Business Tax Preparation and Individual Tax Preparation services ensure your deductions are claimed correctly and backed by the records the IRS expects. We serve business owners across Wheaton, Carol Stream, and Naperville.