The IRS requires you to report every dollar from side hustle income, but most gig workers leave hundreds or thousands on the table by missing available tax deductions. Claiming business deductions reduces both your income tax bill and self-employment tax, a double benefit that compounds your savings.
Side hustle deductions work differently than standard itemized deductions. When you operate a side business, you can deduct ordinary and necessary expenses directly tied to earning that income. These deductions lower your taxable profit, which then reduces the self-employment tax you owe (currently 15.3 percent on net earnings).
Common deductions include home office space if you have a dedicated workspace. You can deduct either actual expenses like utilities and rent proportional to your office, or use the simplified method at $5 per square foot (up to 300 square feet). Equipment and supplies used for your business are fully deductible in the year purchased if under $2,500, or depreciated over time if costlier.
Mileage deductions apply if you drive for your side hustle. The 2025 standard mileage rate remains at 67 cents per mile for business use. Track every trip to client meetings, supply runs, or delivery locations. Professional services like accounting, legal fees, and software subscriptions count as deductions. Internet and phone bills are partially deductible if your side business uses them.
Other overlooked deductions include advertising costs, subscriptions to industry publications, training courses, certifications, and conference attendance. If you pay other people to help with your business, contractor payments are deductible.
The key is documentation. The IRS wants receipts, invoices, and mileage logs. Use apps like QuickBooks Self-Employed or Wave to track expenses throughout the year rather than scrambling at tax time. Keep receipts for everything over $75