If you earn $400 or more from self-employment, you owe self-employment tax of 15.3% on 92.35% of net earnings: 12.4% for Social Security and 2.9% for Medicare. BLS data shows 36% of U.S. workers now have a side gig, yet most are blindsided by that first tax bill.
How Self-Employment Tax Works
As a W-2 employee, your employer pays half of your payroll taxes (7.65%) and you pay the other half. As self-employed, you pay both halves — the full 15.3%. The IRS allows you to deduct the employer-equivalent half as an above-the-line deduction, bringing the effective rate to approximately 14.1% on the first $168,600 of combined earnings.
The Most Valuable Deductions
Home office deduction saves $300-$1,500 (simplified method: $5 per square foot up to 300 sq ft). Vehicle expenses at 67 cents per mile can yield thousands for delivery or rideshare workers. Health insurance premiums are 100% deductible for the self-employed. Retirement contributions via a SEP-IRA (up to 25% of net SE income) or Solo 401(k) simultaneously reduce taxable income and build long-term wealth.
The W-2 Plus Side Hustle Strategy
If you have a W-2 job, increase your W-4 withholding to cover estimated taxes from side income instead of making quarterly payments. Calculate: total side income multiplied by your estimated marginal rate, divided by remaining pay periods equals additional withholding per paycheck. This avoids quarterly filing entirely.
Originally published on WealthWise OS