Side Hustle Tax Calculator

How Much Tax Will You Pay on Side Hustle Income?

Most tax calculators treat your income as one lump sum. This one shows what really happens when you stack 1099 income on top of your W-2 job — including the 15.3% self-employment tax that catches most people off guard.

Your Income

$
$
$

For every $1 you earn from your side hustle, you keep

$0.65

Your side hustle is taxed at an effective 34.6% (federal income tax + self-employment tax)

W-2 Only
W-2 + Side Hustle
Gross Income
$65,000
$85,000
Taxable Income
$50,400
$68,987
Federal Income Tax
$6,141
$10,230
Self-Employment Tax
$0
$2,826
Total Federal Tax
$6,141
$13,056
Effective Tax Rate
9.4%
15.4%
Marginal Tax Bracket
22.0%
22.0%

Self-Employment Tax Breakdown

As a 1099 contractor, you pay both the employer and employee portions of Social Security and Medicare taxes — 15.3% total on 92.35% of your net self-employment income.

Social Security (12.4%)

$2,290

Medicare (2.9%)

$536

Deductible Half

-$1,413

You can deduct 50% of your SE tax from your adjusted gross income, reducing your federal income tax slightly.

Your Side Hustle Bottom Line

Gross 1099 income$20,000
Net self-employment income$20,000
Additional federal income tax-$4,089
Self-employment tax-$2,826
What you actually keep$13,085

Why Side Hustle Income Is Taxed Differently

When you earn money as a W-2 employee, your employer pays half of your Social Security and Medicare taxes (7.65%). You only see your half deducted from your paycheck.

As a 1099 contractor or freelancer, you are both the employer and the employee. That means you pay the full 15.3% self-employment tax — 12.4% for Social Security (up to the wage base of $168,600 in 2024) and 2.9% for Medicare (no cap).

On top of that, your side hustle income stacks on top of your W-2 salary, so every dollar is taxed at your highest marginal bracket. If your W-2 job puts you in the 22% bracket, your side hustle income starts there — not at the bottom.

How to Reduce Your Side Hustle Tax Bill

  • Track every business expense. Home office, internet, software, supplies, mileage — these reduce your net self-employment income, lowering both income tax and SE tax.
  • Consider an S-Corp election. If your side hustle earns over $40-50K, forming an S-Corp lets you pay yourself a reasonable salary and take the rest as distributions, avoiding SE tax on the distribution portion.
  • Open a Solo 401(k) or SEP IRA. You can contribute up to $23,000 (employee) plus 25% of net self-employment income (employer) to a Solo 401(k), reducing your taxable income significantly.
  • Pay quarterly estimated taxes. Avoid a surprise tax bill (and potential penalties) by paying estimated taxes each quarter using IRS Form 1040-ES.