Side Hustle Taxes: Self-Employment Tax, Quarterly Payments

More than 70 million Americans earn income outside their primary W-2 job. Whether it's freelance design, DoorDash, Airbnb, or tutoring, the tax implications are the same — and they catch most side hustlers by surprise the first year.

The self-employment tax: the one most people miss

W-2 employees pay 7.65% FICA (Social Security + Medicare) and their employer matches another 7.65%. Self-employed people pay both sides — 15.3% self-employment tax on net earnings, in addition to federal income tax. This is the most common surprise for first-time freelancers.

Quarterly estimated tax payments

If you expect to owe more than $1,000 in federal taxes from self-employment, you must make quarterly estimated payments to avoid penalties. Due dates: April 15, June 15, September 15, and January 15 of the following year.

Deductions that reduce your tax bill

• Home office deduction: Dedicated space used exclusively for business — either by percentage of home or simplified $5/sq ft (max $1,500)
• Self-employment health insurance: 100% deductible if you're not eligible for employer-sponsored coverage
• SEP-IRA or Solo 401(k): Up to 25% of net self-employment income into a retirement account, reducing taxable income
• Business expenses: Software, equipment, professional fees, marketing, education related to your business
• Half of self-employment tax: You can deduct half the SE tax as an above-the-line deduction