How Do I Handle Taxes for Freelance Side Gigs?

Your total income — W-2 wages plus freelance income — determines your tax bracket. If your W-2 puts you in the 22% bracket, every dollar of side income above that line is taxed at 22% federal (or higher) plus SE tax of 15.3%, plus state. Side income often gets taxed at higher marginal rates than your W-2 expects.

An $80k W-2 employee with $20k of side gig income owes ~$8,000 in additional tax on the $20k — far more than someone at $20k total income would.

Your W-2 already paid your half of FICA. SE tax (15.3%) only applies to your side gig's net profit. Calculate Schedule C net profit, then multiply by 92.35% × 15.3% — that's your additional SE tax obligation from side income.

Your employer withholds based on your W-2 wages alone, with no awareness of your side income. The federal income tax owed on side income is in addition. SE tax is entirely additional. State tax is entirely additional. Total: usually 30-45% of side income.

Side gig net profit projection: $20,000
Additional federal income tax (22% bracket): $4,400
SE tax: $20k × 92.35% × 15.3% = $2,826
State (5%): $1,000
──────────────────────
Total side gig tax: ~$8,226
÷ 4 quarters = ~$2,057 per quarter

An alternative to quarterly estimates: increase your W-2 withholding via a new W-4 to cover the side gig tax. The advantage: W-2 withholding is treated as paid evenly across the year, sidestepping per-quarter underpayment penalties. Update Step 4(c) on Form W-4 with the additional dollar amount you want withheld per paycheck.

TaxClutch is built for hybrid income. Add your W-2 in profile settings. Log freelance income as you earn it. The dashboard shows your unified tax estimate — federal, SE, and state — already accounting for W-2 withholding so you only see the additional amount needed.